Add ex2.i2c-bitbang example code

guowenxue

4 days ago d42fb887237e30d5026e006a3774d6b0a215b829

Add ex2.i2c-bitbang example code

 ex2.i2c-bitbang/.gitignore

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# ===== .vscode: 只保留下面三个文件 =====
.vscode/*
!.vscode/stm32flash.bat
!.vscode/stm32flash.exe
!.vscode/tasks.json

# ===== Keil MD: 只保留下面两个文件 =====
MDK-ARM/*
!MDK-ARM/ISKBoard.uvoptx
!MDK-ARM/ISKBoard.uvprojx

# ===== STM32CubeIDE: 忽略下面文件 =====
.project

# ===== 只保留这两个文件不忽略 =====
# main.c
Core/*
!Core/Src/
Core/Src/*
!Core/Src/main.c

# ===== 忽略 CMake 相关生成文件 =====
.clangd
.mxproject
CMakePresets.json
cmake/
.settings/

# ===== 忽略启动文件、链接脚本 =====
*.ld
startup_stm32*.s

# ===== 忽略厂商 SDK(如果之后 Drivers/ 出现的话)=====
Drivers/
Middlewares/

# ===== 忽略编译产物 =====
build/
Debug/
Release/
*.o
*.d
*.a
*.elf
*.bin
*.hex
*.map

 ex2.i2c-bitbang/.vscode/tasks.json

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{
    "version": "2.0.0",
    "tasks": [
        {
            "label": "STM32: Flash via ST-Link (SWD)",
            "type": "shell",
            "command": "cube",
            "args": [
                "programmer",
                "-c", "port=SWD", "freq=4000", "reset=HWrst",
                "-w", "${workspaceFolder}\\build\\Release\\ISKBoard.elf",
                "-rst"
            ],
            "group": "build",
            "problemMatcher": [],
            "presentation": {
                "reveal": "always",
                "panel": "shared",
                "clear": true
            }
        },
        {
            "label": "STM32: Flash via Serial (UART)",
            "type": "shell",
            "command": "cube",
            "args": [
                "programmer",
                "--connect", "port=${input:comPort}",
                "-w", "${workspaceFolder}\\build\\Release\\ISKBoard.elf"
            ],
            "group": "build",
            "problemMatcher": [],
            "presentation": {
                "reveal": "always",
                "panel": "shared",
                "clear": true
            }
        }
    ],
    "inputs": [
        {
            "id": "comPort",
            "type": "promptString",
            "description": "!!!请确保开发板进入烧录模式，并输入串口号!!!",
            "default": "COM22"
        }
    ]
}

 ex2.i2c-bitbang/Board/CMakeLists.txt

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cmake_minimum_required(VERSION 3.16)

# 取当前文件夹名,并转成小写作为库名
get_filename_component(MODULE_NAME ${CMAKE_CURRENT_SOURCE_DIR} NAME)
string(TOLOWER ${MODULE_NAME} MODULE_NAME_LOWER)

project(${MODULE_NAME_LOWER} C)

# 收集当前目录源码
file(GLOB MODULE_SRC
    "${CMAKE_CURRENT_SOURCE_DIR}/*.c"
)

# 创建静态库
add_library(${MODULE_NAME_LOWER} STATIC
    ${MODULE_SRC}
)

# 头文件搜索路径
target_include_directories(${MODULE_NAME_LOWER}
    PUBLIC
        ${CMAKE_CURRENT_SOURCE_DIR}
)

target_link_libraries(${MODULE_NAME_LOWER}
    PUBLIC
        stm32cubemx
)

 ex2.i2c-bitbang/Board/buzzer.c

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/**********************************************************************
*   Copyright: (C)2024 LingYun IoT System Studio
*      Author: GuoWenxue<guowenxue@gmail.com>
* Description: ISKBoard buzzer/beeper driver and music play
*
*   ChangeLog:
*        Version    Date       Author            Description
*        V1.0.0  2024.08.29    GuoWenxue      Release initial version
***********************************************************************/

#include "tim.h"
#include "buzzer.h"

#define mdelay(ms)            HAL_Delay(ms)
#define ARRAY_SIZE(song)      (sizeof(song)/sizeof(song[0]))

/* 音符频率定义(Hz) */
#define NOTE_C4   524
#define NOTE_D4   588
#define NOTE_E4   660
#define NOTE_F4   698
#define NOTE_G4   784
#define NOTE_A4   880
#define NOTE_B4   988
#define NOTE_C5   1046
#define NOTE_D5   1174
#define NOTE_E5   1318
#define NOTE_F5   1396
#define NOTE_G5   1568
#define NOTE_A5   1760
#define NOTE_B5   1976
#define NOTE_C6   2093
#define REST      0

#define BEAT      400   /* 一拍时长(ms)，可自行调整节奏快慢 */

/* 《小星星》简谱：
 * 1 1 5 5 6 6 5   -   4 4 3 3 2 2 1
 * 5 5 4 4 3 3 2   -   5 5 4 4 3 3 2
 * 1 1 5 5 6 6 5   -   4 4 3 3 2 2 1
 * (C=1, D=2, E=3, F=4, G=5, A=6, B=7)
 */
const Note_t twinkle[] =
{
    /* Twinkle twinkle little star */
    {NOTE_C4, BEAT}, {NOTE_C4, BEAT}, {NOTE_G4, BEAT}, {NOTE_G4, BEAT},
    {NOTE_A4, BEAT}, {NOTE_A4, BEAT}, {NOTE_G4, BEAT * 2},

    /* How I wonder what you are */
    {NOTE_F4, BEAT}, {NOTE_F4, BEAT}, {NOTE_E4, BEAT}, {NOTE_E4, BEAT},
    {NOTE_D4, BEAT}, {NOTE_D4, BEAT}, {NOTE_C4, BEAT * 2},

    /* Up above the world so high */
    {NOTE_G4, BEAT}, {NOTE_G4, BEAT}, {NOTE_F4, BEAT}, {NOTE_F4, BEAT},
    {NOTE_E4, BEAT}, {NOTE_E4, BEAT}, {NOTE_D4, BEAT * 2},

    /* Like a diamond in the sky */
    {NOTE_G4, BEAT}, {NOTE_G4, BEAT}, {NOTE_F4, BEAT}, {NOTE_F4, BEAT},
    {NOTE_E4, BEAT}, {NOTE_E4, BEAT}, {NOTE_D4, BEAT * 2},

    /* Twinkle twinkle little star (repeat) */
    {NOTE_C4, BEAT}, {NOTE_C4, BEAT}, {NOTE_G4, BEAT}, {NOTE_G4, BEAT},
    {NOTE_A4, BEAT}, {NOTE_A4, BEAT}, {NOTE_G4, BEAT * 2},

    /* How I wonder what you are (repeat) */
    {NOTE_F4, BEAT}, {NOTE_F4, BEAT}, {NOTE_E4, BEAT}, {NOTE_E4, BEAT},
    {NOTE_D4, BEAT}, {NOTE_D4, BEAT}, {NOTE_C4, BEAT * 2},
};
const uint32_t twinkle_count = ARRAY_SIZE(twinkle);

/* 《祝你生日快乐》(Happy Birthday to You)
 * 该曲旋律/歌词经美国法院2015-2016年裁定确认为公有领域作品，可放心使用。
 * 简谱: 5 5 6 5 1' 7 | 5 5 6 5 2' 1' | 5 5 5' 3' 1' 7 6 | 4' 4' 3' 1' 2' 1'
 */
const Note_t happy_birthday[] =
{
    /* Happy Birthday to you */
    {NOTE_G4, BEAT / 2}, {NOTE_G4, BEAT / 2}, {NOTE_A4, BEAT}, {NOTE_G4, BEAT},
    {NOTE_C5, BEAT}, {NOTE_B4, BEAT * 2},

    /* Happy Birthday to you */
    {NOTE_G4, BEAT / 2}, {NOTE_G4, BEAT / 2}, {NOTE_A4, BEAT}, {NOTE_G4, BEAT},
    {NOTE_D5, BEAT}, {NOTE_C5, BEAT * 2},

    /* Happy Birthday dear friend */
    {NOTE_G4, BEAT / 2}, {NOTE_G4, BEAT / 2}, {NOTE_G5, BEAT}, {NOTE_E5, BEAT},
    {NOTE_C5, BEAT}, {NOTE_B4, BEAT}, {NOTE_A4, BEAT * 2},

    /* Happy Birthday to you */
    {NOTE_F5, BEAT / 2}, {NOTE_F5, BEAT / 2}, {NOTE_E5, BEAT}, {NOTE_C5, BEAT},
    {NOTE_D5, BEAT}, {NOTE_C5, BEAT * 2},

    /* 结尾留白 */
    {REST, BEAT * 2},
};
const uint32_t happy_birthday_count = ARRAY_SIZE(happy_birthday);

/* 《Jingle Bells》(铃儿响叮当)
 * 1857年James Lord Pierpont创作，早已进入公有领域。
 * (下面是常见的简化版本，节奏为大致还原，供播放测试使用)
 */
const Note_t jingle_bells[] =
{
    /* Jingle bells, jingle bells, jingle all the way */
    {NOTE_E4, BEAT}, {NOTE_E4, BEAT}, {NOTE_E4, BEAT * 2},
    {NOTE_E4, BEAT}, {NOTE_E4, BEAT}, {NOTE_E4, BEAT * 2},
    {NOTE_E4, BEAT}, {NOTE_G4, BEAT}, {NOTE_C4, BEAT}, {NOTE_D4, BEAT},
    {NOTE_E4, BEAT * 4},

    /* Oh what fun it is to ride in a one-horse open sleigh */
    {NOTE_F4, BEAT}, {NOTE_F4, BEAT}, {NOTE_F4, BEAT}, {NOTE_F4, BEAT},
    {NOTE_F4, BEAT}, {NOTE_E4, BEAT}, {NOTE_E4, BEAT}, {NOTE_E4, BEAT / 2}, {NOTE_E4, BEAT / 2},
    {NOTE_E4, BEAT}, {NOTE_D4, BEAT}, {NOTE_D4, BEAT}, {NOTE_E4, BEAT},
    {NOTE_D4, BEAT * 2}, {NOTE_G4, BEAT * 2},

    /* 结尾留白 */
    {REST, BEAT * 2},
};
const uint32_t jingle_bells_count = ARRAY_SIZE(jingle_bells);

/*
 *+----------------------------+
 *|       PWM buzzer API       |
 *+----------------------------+
 */

/**
 * @brief  设置蜂鸣器发声频率(占空比固定50%)
 */
static inline void Buzzer_SetFreq(uint32_t freq)
{
    /* TIM1 初始化 PSC = 79，计数时钟 = 80MHz/80 = 1MHz */
    uint32_t arr = 1000000U / freq - 1U;
    __HAL_TIM_SET_AUTORELOAD(&htim1, arr);
    __HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_4, arr / 2U);
    __HAL_TIM_SET_COUNTER(&htim1, 0);
}

/**
 * @brief  让蜂鸣器响 $times 次，每次间隔 $interval 毫秒
 */
void beep_start(uint16_t times, uint16_t interval)
{
    Buzzer_SetFreq(2700);

    while( times-- )
    {
        /* Start buzzer */
        HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_4);

        mdelay(interval);

        /* Stop buzzer */
        HAL_TIM_PWM_Stop(&htim1, TIM_CHANNEL_4);

        mdelay(interval);
    }
}

/**
 * @brief  播放单个音符
 */
static void Buzzer_PlayNote(uint32_t freq, uint32_t duration_ms)
{
    if (freq == 0)
    {
        HAL_TIM_PWM_Stop(&htim1, TIM_CHANNEL_4);
        mdelay(duration_ms);
        return;
    }

    Buzzer_SetFreq(freq);

    HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_4);
    mdelay(duration_ms - 30);

    HAL_TIM_PWM_Stop(&htim1, TIM_CHANNEL_4);

    mdelay(30);
}

/**
 * @brief  播放歌曲
 */
void Play_Song(const Note_t *song, uint32_t note_count)
{
    for (uint32_t i = 0; i < note_count; i++)
    {
        Buzzer_PlayNote(song[i].freq, song[i].duration);
    }
}

 ex2.i2c-bitbang/Board/buzzer.h

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/**********************************************************************
*   Copyright: (C)2024 LingYun IoT System Studio
*      Author: GuoWenxue<guowenxue@gmail.com>
* Description: ISKBoard buzzer/beeper driver and music play
*
*   ChangeLog:
*        Version    Date       Author            Description
*        V1.0.0  2024.08.29    GuoWenxue      Release initial version
***********************************************************************/

#ifndef __BUZZER_H
#define __BUZZER_H

typedef struct
{
    uint32_t freq;      /* 音符频率，0表示休止 */
    uint32_t duration;  /* 持续时间(ms) */
} Note_t;

/**
 * @brief  让蜂鸣器响 $times 次，每次间隔 $interval 毫秒
 */
extern void beep_start(uint16_t times, uint16_t interval);

/**
 * @brief  播放歌曲
 */
extern void Play_Song(const Note_t *song, uint32_t note_count);

extern const Note_t twinkle[];
extern const uint32_t twinkle_count;
extern const Note_t happy_birthday[];
extern const uint32_t happy_birthday_count;
extern const Note_t jingle_bells[];
extern const uint32_t jingle_bells_count;

#endif

 ex2.i2c-bitbang/Board/ds18b20.c

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/**********************************************************************
 *   Copyright: (C)2024 LingYun IoT System Studio
 *      Author: GuoWenxue<guowenxue@gmail.com>
 *
 * Description: Temperature sensor DS18B20 driver on ISKBoard
 *
 *   ChangeLog:
 *        Version    Date       Author            Description
 *        V1.0.0  2024.08.29    GuoWenxue      Release initial version
 *
 ***********************************************************************/

 #include "miscdev.h"

/* DS18B20 上的数据通信口 DQ 连到了 CPU 的 PA12 引脚上 */
static gpio_t   W1Dat =
{
    .name = "1-wire",
    .group = GPIOA,
    .pin   = GPIO_PIN_12,
};

/* 下面定义了一些DS18B20通信DQ引脚的操作宏，这里之所以用宏而不是函数是
 * 减少函数调用的CPU开销。在下面宏中最后面出现的 \ 为断行符，如果不清楚
 * 的话，可以自行 Deepseek 搜索学习：宏定义 断行符
 */

/* 这里定义了一个宏，用来初始化DQ引脚：设置为输入模式，并使能内部上拉 */
#define W1DQ_Input()        \
{   \
    GPIO_InitTypeDef GPIO_InitStruct = {0}; \
    GPIO_InitStruct.Pin = W1Dat.pin; \
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT; \
    GPIO_InitStruct.Pull = GPIO_PULLUP; \
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; \
    HAL_GPIO_Init(W1Dat.group, &GPIO_InitStruct); \
}

/* 这里定义了一个宏，用来把 DQ 引脚设置为推挽输出模式 */
#define W1DQ_Output()       \
{   \
    GPIO_InitTypeDef GPIO_InitStruct = {0}; \
    GPIO_InitStruct.Pin = W1Dat.pin; \
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; \
    GPIO_InitStruct.Pull = GPIO_NOPULL; \
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; \
    HAL_GPIO_Init(W1Dat.group, &GPIO_InitStruct); \
}

/* 这里定义了一个宏，用来写控制 DQ 引脚时输出高电平还是低电平 */
#define W1DQ_Write(x)   HAL_GPIO_WritePin(W1Dat.group, W1Dat.pin, \
                        (x==1)?GPIO_PIN_SET:GPIO_PIN_RESET)

/* 这里定义了一个宏，用来读 DQ 引脚，当前时高电平还是低电平 */
#define W1DQ_Read()     HAL_GPIO_ReadPin(W1Dat.group,  W1Dat.pin)

/* 这里定义了一个枚举，用来定义低电平和高电平 */
enum {
    LOW,  /* 低电平：LOW=0 */
    HIGH, /* 高电平: LOW=1 */
};

/* 单总线上的所有通信都是以初始化序列开始，Master发出初始化信号后等待从设备的应答信号，以确定从设备是否存在并能正常工作。 */
static int ds18b20_reset(void)
{
    int time = 0;
    int present = 0; /* 设置默认值没有探测到 DS18B20 */
    static int firstin = 1;

    /* 使能所用 GPIO 口的时钟 */
    if(firstin)
    {
        gpio_clk_enable(W1Dat.group);
        firstin = 0;
    }

    /* 设置 DQ 引脚为输出模式 */
    W1DQ_Output();

    /* 主机(CPU)输出低电平，并保持低电平时间至少 480us，以产生复位脉冲。 */
    W1DQ_Write(LOW);
    udelay(480);

    /* 接着主机(CPU)释放总线, 4.7K 的上拉电阻将单总线拉高，延时 15～60 us，并进入接收模式(Rx) */
    W1DQ_Write(HIGH); // 这里先拉高是确保在模式切换瞬间，总线已经是高电平，避免模式切换瞬间可能出现的不确定状态。
    udelay(60);
    W1DQ_Input();

    /* DS18B20芯片在收到主机发送过来的这个复位脉冲后，将会拉低总线 60~240 us，以产生低电平应答脉冲 */
    while( W1DQ_Read() && time<240) {
        time++;
        udelay(1);
    }

    /* 如果 time<240 则说明上面的while()循环是因为W1DQ_Read()读到了低电平(0) 跳出的，而不是超时
     * 跳出。这也就意味着CPU在这段期间读到了低电平，探测到DS18B20芯片了。
    */
    if( time < 240 )
        present = 1;

    /* 释放总线并维持至少480us */
    W1DQ_Output();
    W1DQ_Write(HIGH);
    udelay(480-time);

    return present;
}

/*
* 写 0 时序：主机输出低电平，延时 60us，然后释放总线，延时 2us；
* 写 1 时序：主机输出低电平，延时 2us，然后释放总线，延时 60us；
*/
void ds18b20_write_byte(uint8_t byte)
{
    uint8_t            i = 0;

    /* 设置 DS18B20的DQ引脚为输出模式 */
    W1DQ_Output();

    /* 1个字节包含8个位，DS18B20数据发送是LSB(低位先发送) */
    for(i=0; i<8; i++) {

        /* DS18B20的写0逻辑是将 DQ 拉低>=60us 后拉高,写1逻辑是拉低<=15us后拉高 */

        /* 这里先将 DS18B20 的 DQ 线线拉低 10us(<15us) */
        W1DQ_Write(LOW);
        udelay(10);

        /* 判断当前位是1还是0 */
        if( byte & 0x1 )
            W1DQ_Write(HIGH); /* 如果当前位是1，则现在就拉成高电平，这样低电平维持时间 10us */
        else
            W1DQ_Write(LOW); /* 如果当前位是0，则继续维持低电平，这样低电平维持时间位 10+下面的60us */

        /* 无论是写0还是写1，DQ的写时序都要大于15+15+30=60us */
        udelay(60);

        /* 发送0/1数据位完成后，拉高总线并延时 2us */
        W1DQ_Write(HIGH);
        udelay(2);

        /* 该字节数据右移1位，即再发下一位数据 */
        byte >>= 1;
    }
}

/* 当总线控制器把数据线从高电平拉到低电平时，读时序开始，数据线必须至少保持1us，然后总线被释放。
 * DS18B20 通过拉高或拉低总线上来传输”1”或”0”。
 */
uint8_t ds18b20_read_byte(void)
{
    uint8_t            i = 0;
    uint8_t            byte = 0;

    /* 1个字节包含8个位，DS18B20数据发送是LSB(低位先发送)，所以读也是LSB */
    for(i=0; i<8; i++) {
        /* 当CPU把数据线DQ拉低至少1us后，读时序开始。*/
        W1DQ_Output();
        W1DQ_Write(LOW);
        udelay(2);

        /* CPU拉高DQ释放总线 */
        W1DQ_Write(HIGH);
        udelay(2);

        /* CPU设置DQ为输入模式，等待DS18B20发数据过来，注意此时需要靠上拉电阻将总线拉成高电平 */
        W1DQ_Input();

        /* DS18B20开始以 LSB (lower bit first) 模式发送数据 */
        if( W1DQ_Read() ) {
            byte |= 1<<i; /* 如果接收到该位是高电平，则将相应位设置为1，否则为0 */
        }

        /* 读时序至少维持15+45=60us */
        udelay(60);

        /* CPU拉高DQ并释放总线 */
        W1DQ_Output();
        W1DQ_Write(HIGH);
        udelay(2);
    }

    return byte;
}

/* 该函数用来给 DS18B20 传感器发送开始采样温度命令 */
static inline int ds18b20_convert(void)
{
    /* 发送复位信号，看DS18B20模块是否在位，如果模块不在或坏了就返回错误值(-1)。 */
    if( !ds18b20_reset() )
        return -1;

    /* 这里我们不关心ROM中的16位产品序列号，就发送 Skip ROM 命令跳过SN的读取 */
    ds18b20_write_byte(0xCC);

    /* 发送 Convert T 命令，通知DS18B20开始温度采样 */
    ds18b20_write_byte(0x44);

    return 0;
}

/* 根据DS18B20的 CRC 校验公式(CRC = X^8 + X^5 + X^4 + 1) 来检测收到的数据是否出错 */
static int ds18b20_checkcrc(uint8_t *data, uint8_t length, uint8_t checksum)
{
    uint8_t     i, j, byte;
    uint8_t     mix = 0;
    uint8_t     crc = 0;

    for ( i=0; i<length; i++ ) {
        byte = data[i];

        for( j=0; j<8; j++ ) {
            mix = ( crc ^ byte ) & 0x01;
            crc >>= 1;
            if ( mix )
                crc ^= 0x8C; //POLYNOMIAL;
            byte >>= 1;
        }
    }

    return crc==checksum ? 1 : 0;
}

/* 读取 DS18B20 的采样温度值 */
static inline int ds18b20_read(uint8_t *out, int bytes)
{
    uint8_t     buf[9];
    uint8_t     i = 0;

    /* CPU给DS18B02发送复位信号并探测芯片是否存在 */
    if( !ds18b20_reset() )
        return -1;

    /* 这里我们不关心ROM中的16位产品序列号，就发送 Skip ROM 命令跳过SN的读取 */
    ds18b20_write_byte(0xCC);

    /* 发送 Read Scratchpad 命令开始读取DS18B20的采样温度值 */
    ds18b20_write_byte(0xBE);

    buf[i++] = ds18b20_read_byte(); /* 第1个字节是温度值的低字节(LSB) */
    buf[i++] = ds18b20_read_byte(); /* 第2个字节是温度值的高字节(MSB) */
    buf[i++] = ds18b20_read_byte(); /* 第3个字节不关心 */
    buf[i++] = ds18b20_read_byte(); /* 第4个字节不关心 */
    buf[i++] = ds18b20_read_byte(); /* 第5个字节是用户配置寄存器，也不关系 */
    buf[i++] = ds18b20_read_byte(); /* 第6个字节保留(0xFF) */
    buf[i++] = ds18b20_read_byte(); /* 第7个字节保留 */
    buf[i++] = ds18b20_read_byte(); /* 第8个字节保留(0x10) */
    buf[i++] = ds18b20_read_byte(); /* 第9个字节是CRC校验和 */

    /* 将读取到的前8个字节数据按照CRC公司计算校验和，与第9个字节做对比看是否匹配 */
    if( !ds18b20_checkcrc(buf, 8, buf[8]) ) {
        return -2; /* CRC校验失败就返回错误值 */
    }

    /* CRC校验通过就输出读到的2字节温度采样原始数据 */
    out[0]=buf[0];
    out[1]=buf[1];

    return 0;
}

int ds18b20_sample(float *temperature)
{
    uint8_t               byte[2];
    uint8_t               sign;
    uint16_t              temp;
    static uint8_t        firstin = 1;

    if( !temperature )
        return -1;

    /* 发送开始采样的命令 */
    if( ds18b20_convert()<0 )
        return -2;

    /* 芯片datasheet说明第一次启动采样最大需要750ms完成，否则将会在100ms内完成采样 */
    if( firstin ) {
        mdelay(750);
        firstin = 0;
    }
    else {
        mdelay(100);
    }

    /* 开始从DS18B20传感器读取2字节的原始数据 */
    if( ds18b20_read(byte, 2)<0 )
        return -3;

    /* 采样温度值两个字节，共16位。其中byte[0]为低字节、byte[1]为高字节：
     * LSB: Bits[0:3]为小数位 2^(-4) ~ 2^(-1) Bits[4:7]为整数位:2^0~2^3
     * MSB: Bits[0:2]为为整数位:2^4~2^6   Bits[3:7]为符号位: 全1表示温度为负值
     */

    /* 高字节的低3位为温度整数值，高8位为符号位。*/
    if( byte[1]> 0x7 ) { /* 如果>7(低三位最大为111=7)，说明为负值 */
        temp = ~(byte[1]<<8|byte[0]) + 1;
        sign=0;
    }
    else {
        temp = byte[1]<<8 | byte[0];
        sign=1;
    }

   /* DS18b20默认工作精度为12位，高8位是整数部分，低4位为小数部分。小数部分刻度为0.0625(1/16) */
    *temperature = (temp>>4) + (temp&0xF)*0.0625 ;
    if( !sign ) {
        *temperature = -*temperature;
    }

    return 0;
}

 ex2.i2c-bitbang/Board/ds18b20.h

New file
@@ -0,0 +1,18 @@
/**********************************************************************
 *   Copyright: (C)2024 LingYun IoT System Studio
 *      Author: GuoWenxue<guowenxue@gmail.com>
 *
 * Description: Temperature sensor DS18B20 driver on ISKBoard
 *
 *   ChangeLog:
 *        Version    Date       Author            Description
 *        V1.0.0  2024.08.29    GuoWenxue      Release initial version
 *
 ***********************************************************************/

#ifndef __DS18B20_H_
#define __DS18B20_H_

extern int ds18b20_sample(float *temperature);

#endif /* __DS18B20_H_ */

 ex2.i2c-bitbang/Board/eeprom.c

New file
@@ -0,0 +1,284 @@
/**********************************************************************
* Copyright: (C)2024 LingYun IoT System Studio
* Author: GuoWenxue<guowenxue@gmail.com>
* Description: I2C EEPROM device driver for ISKBoard (Internal Lock Version)
*
* ChangeLog:
* Version    Date       Author            Description
* V1.5.0  2026.07.08    GuoWenxue         Use goto cleanup for unified lock releasing
***********************************************************************/

#include "eeprom.h"
#include "miscdev.h" /* 提供 mdelay() / udelay() */
#include <stdio.h>
#include <string.h>


/* EEPROM 型号表：未来若有新芯片，只需在此处追加一行，其余代码不用更改 */
static const eeprom_info_t eeprom_ids[] = {
    { EEPROM_INFO("AT24C02",  256,   8,  1) },
    { EEPROM_INFO("AT24C04",  512,   16, 1) },
    { EEPROM_INFO("AT24C08",  1024,  16, 1) },
    { EEPROM_INFO("AT24C16",  2048,  16, 1) },
    { EEPROM_INFO("AT24C32",  4096,  32, 2) },
    { EEPROM_INFO("AT24C64",  8192,  32, 2) },
    { EEPROM_INFO("AT24C128", 16384, 64, 2) },
    { EEPROM_INFO("AT24C256", 32768, 64, 2) },
};
#define EEPROM_IDS_NUM  (sizeof(eeprom_ids) / sizeof(eeprom_ids[0]))

/**
 * @brief  根据芯片型号名称内部查找匹配的型号
 */
static const eeprom_info_t *eeprom_find_info_by_name(const char *name)
{
    uint32_t i;
    for (i = 0; i < EEPROM_IDS_NUM; i++)
    {
        if (strcmp(eeprom_ids[i].name, name) == 0)
        {
            return &eeprom_ids[i];
        }
    }
    return NULL;
}

/**
 * @brief  初始化 EEPROM 设备参数（通过型号名称自动查表匹配）
 */
int eeprom_init(eeprom_dev_t *eeprom, i2c_bus_t *bus, uint8_t dev_addr, const char *chip_name)
{
    const eeprom_info_t *info = eeprom_find_info_by_name(chip_name);

    if (!info || !eeprom || !bus)
    {
        printf("EEPROM: Named device [%s] not supported!\r\n", chip_name ? chip_name : "NULL");
        return -1;
    }

    eeprom->bus = bus;
    eeprom->dev_addr = dev_addr;
    eeprom->info = info;

    printf("Initialized EEPROM(%s), Capacity: %ld Bytes, Page Size: %ld\r\n",
            info->name, info->capacity, info->page_size);
    return 0;
}

/**
 * @brief  EEPROM 测试函数
 */
int eeprom_test(i2c_bus_t *bus)
{
    eeprom_dev_t my_at24c256;
    uint8_t tx_buf[100];
    uint8_t rx_buf[100];
    int i;
    int rv = -1;

    /* 1. 初始化 EEPROM 参数 */
    if (eeprom_init(&my_at24c256, bus, 0x50, "AT24C256") != 0)
    {
        return -1;
    }

    /* 2. 填充测试数据 */
    for (i = 0; i < sizeof(tx_buf); i++)
    {
        tx_buf[i] = i;
    }

    /* 3. 测试跨页连续写 */
    if (eeprom_write(&my_at24c256, 0x00A0, tx_buf, sizeof(tx_buf)) != I2C_OK)
    {
        goto cleanup;
    }

    /* 4. 测试任意地址连续读 */
    if (eeprom_read(&my_at24c256, 0x00A0, rx_buf, sizeof(rx_buf)) != I2C_OK)
    {
        goto cleanup;
    }

    /* 5. 数据一致性校验 */
    if (memcmp(tx_buf, rx_buf, sizeof(tx_buf)) == 0)
    {
        rv = 0;
    }

cleanup:
    printf("AT24C256 Read/Write Test %s!\r\n", rv == 0 ? "Passed" : "Failed");
    return rv;
}

/**
 * @brief  24C16仅支持单字节地址(可寻址256字节)，需借用I2C设备地址的低3位充当片内地址的高3位。
 */
static inline uint8_t eeprom_get_actual_addr(eeprom_dev_t *eeprom, uint16_t reg_addr)
{
    uint8_t actual_dev_addr = eeprom->dev_addr;
    if (eeprom->info->addr_bytes == 1 && eeprom->info->capacity > 256)
    {
        actual_dev_addr |= (uint8_t)((reg_addr >> 8) & 0x07);
    }
    return actual_dev_addr;
}

/**
 * @brief  从 EEPROM 任意地址读取指定长度数据
 */
i2c_status_t eeprom_read(eeprom_dev_t *eeprom, uint16_t reg_addr, uint8_t *buf, uint16_t len)
{
    uint8_t addr_buf[2];
    uint8_t addr_len = 0;
    i2c_msg_t msgs[2];
    i2c_status_t status;

    if ( len == 0 || !buf || !eeprom || !eeprom->bus || !eeprom->info )
    {
        return I2C_OK;
    }

    /* 1. 准备发送数据 */
    if (eeprom->info->addr_bytes == 2)
    {
        addr_buf[addr_len++] = (uint8_t)(reg_addr >> 8);
    }
    addr_buf[addr_len++] = (uint8_t)(reg_addr & 0xFF);

    /* 2. 封装 I2C 消息 */
    msgs[0].addr  = eeprom_get_actual_addr(eeprom, reg_addr);
    msgs[0].flags = I2C_M_WR;
    msgs[0].len   = addr_len;
    msgs[0].buf   = addr_buf;

    msgs[1].addr  = msgs[0].addr;
    msgs[1].flags = I2C_M_RD;
    msgs[1].len   = len;
    msgs[1].buf   = buf;

    /* 3. 锁住 I2C 总线  */
    if (i2c_lock(eeprom->bus) != I2C_OK)
    {
        return I2C_BUSY;
    }

    /* 4. 调用 i2c_transfer 发送消息 */
    status = i2c_transfer(eeprom->bus, msgs, 2);

    /* 5. 释放 I2C 总线 */
    i2c_unlock(eeprom->bus);

    return status;
}

/**
 * @brief  轮询 EEPROM 硬件内部擦写就绪状态
 */
static void eeprom_wait_standby(eeprom_dev_t *eeprom, uint16_t reg_addr)
{
    i2c_msg_t msg;
    uint32_t timeout = 2000;

    msg.addr  = eeprom_get_actual_addr(eeprom, reg_addr);
    msg.flags = I2C_M_WR;
    msg.len   = 0;
    msg.buf   = NULL;

    while (timeout--)
    {
        if (i2c_transfer(eeprom->bus, &msg, 1) == I2C_OK)
        {
            break; /* 芯片返回 ACK，擦写完成，退出轮询 */
        }
        udelay(50);
    }
}

/**
 * @brief  向 EEPROM 写入单页数据
 */
static i2c_status_t eeprom_write_page(eeprom_dev_t *eeprom, uint16_t reg_addr, uint8_t *buf, uint16_t len)
{
    uint8_t tx_payload[128];
    uint8_t addr_len = 0;
    i2c_msg_t msg;
    i2c_status_t status = I2C_OK;

    /* 1. 准备发送数据 */
    if (eeprom->info->addr_bytes == 2)
    {
        tx_payload[addr_len++] = (uint8_t)(reg_addr >> 8);
    }
    tx_payload[addr_len++] = (uint8_t)(reg_addr & 0xFF);
    memcpy(&tx_payload[addr_len], buf, len);

    msg.addr  = eeprom_get_actual_addr(eeprom, reg_addr);
    msg.flags = I2C_M_WR;
    msg.len   = addr_len + len;
    msg.buf   = tx_payload;

    /* 2. 锁住 I2C 总线 */
    if (i2c_lock(eeprom->bus) != I2C_OK)
    {
        return I2C_BUSY;
    }

    /* 3. 调用 i2c_transfer 发送消息 */
    status = i2c_transfer(eeprom->bus, &msg, 1);
    if (status != I2C_OK)
    {
        status = I2C_ERROR;
        goto cleanup;
    }

    /* 4. 轮询等待 EEPROM 内部擦写完成 */
    eeprom_wait_standby(eeprom, reg_addr);

cleanup:
    /* 5. 释放 I2C 总线 */
    i2c_unlock(eeprom->bus);

    return status;
}

/**
 * @brief  大批量数据动态跨页分包连续写入
 */
i2c_status_t eeprom_write(eeprom_dev_t *eeprom, uint16_t reg_addr, uint8_t *buf, uint16_t len)
{
    i2c_status_t status = I2C_OK;
    uint16_t count = 0;
    uint16_t page_offset;
    uint16_t bytes_to_write;

    if ( len == 0 || !buf || !eeprom || !eeprom->bus || !eeprom->info )
    {
        return I2C_OK;
    }

    while (len > 0)
    {
        page_offset = reg_addr % eeprom->info->page_size;

        bytes_to_write = eeprom->info->page_size - page_offset;
        if (bytes_to_write > len)
        {
            bytes_to_write = len;
        }

        /* 内部单页级连写带等就绪的一体化锁定 */
        status = eeprom_write_page(eeprom, reg_addr, &buf[count], bytes_to_write);
        if (status != I2C_OK)
        {
            goto cleanup;
        }

        reg_addr += bytes_to_write;
        count    += bytes_to_write;
        len      -= bytes_to_write;
    }

cleanup:
    return status;
}

 ex2.i2c-bitbang/Board/eeprom.h

New file
@@ -0,0 +1,79 @@
/**********************************************************************
*   Copyright: (C)2024 LingYun IoT System Studio
*      Author: GuoWenxue<guowenxue@gmail.com>
* Description: I2C EEPROM device driver for ISKBoard
*
*   ChangeLog:
*        Version    Date       Author            Description
*        V1.0.0  2024.08.29    GuoWenxue      Release initial version
***********************************************************************/
#ifndef __EEPROM_H__
#define __EEPROM_H__

#include "i2c_bitbang.h"

#define EEPROM_INFO(_name, _cap, _page, _addr_bytes) \
        .name        = _name,       \
        .capacity    = _cap,        \
        .page_size   = _page,       \
        .addr_bytes  = _addr_bytes, \
        .n_pages     = (_cap)/(_page)

typedef struct eeprom_info
{
    const char     *name;         /* 芯片型号名称，如 "AT24C256" */
    uint32_t        capacity;     /* 总容量 (Bytes) */
    uint32_t        page_size;    /* 单页大小 (Bytes) */
    uint8_t         addr_bytes;   /* 片内寻址字节数：1 或 2 */
    uint32_t        n_pages;      /* 总页数 */
} eeprom_info_t;

/* 设备运行时上下文结构体 */
typedef struct eeprom_dev
{
    i2c_bus_t            *bus;       /* 绑定的 I2C 总线 */
    uint8_t               dev_addr;  /* 基础 I2C 从机地址 (通常为 0x50) */
    const eeprom_info_t  *info;      /* 指向匹配成功的规格信息，直接替代原 switch-case */
} eeprom_dev_t;

/* 导出 API */

/**
 * @brief  初始化 EEPROM 设备结构体对象
 * @note   该函数仅做内部参数映射与规格配置(如页大小、芯片容量)。
 * @param  eeprom:   指向 EEPROM 设备句柄的指针
 * @param  bus:      绑定的物理 I2C 总线对象指针
 * @param  dev_addr: EEPROM 的 7 位 I2C 从机基地址 (例如 AT24C256 常规为 0x50)
 * @param  chip_name: EEPROM 的芯片型号名称 (例如 "AT24C256")
 * @retval None
 */
int eeprom_init(eeprom_dev_t *eeprom, i2c_bus_t *bus, uint8_t dev_addr, const char *chip_name);

/**
 * @brief  从 EEPROM 的指定内部地址连续读取数据
 * @param  eeprom:   指向已初始化的 EEPROM 设备句柄的指针
 * @param  reg_addr: 芯片内部物理存储的 16 位起始地址 (0x0000 ~ 0x7FFF)
 * @param  buf:      存放接收数据的用户缓冲区指针
 * @param  len:      期望读取的数据字节数
 * @retval I2C_OK: 读取成功; I2C_ERROR: 总线或从机无应答; I2C_BUSY: 总线被占用
 */
i2c_status_t eeprom_read(eeprom_dev_t *eeprom, uint16_t reg_addr, uint8_t *buf, uint16_t len);

/**
 * @brief  向 EEPROM 的指定内部地址连续写入数据（含跨页切片处理）
 * @param  eeprom:   指向已初始化的 EEPROM 设备句柄的指针
 * @param  reg_addr: 芯片内部物理存储的 16 位起始地址 (0x0000 ~ 0x7FFF)
 * @param  buf:      存放待发送数据的源缓冲区指针
 * @param  len:      期望写入的数据字节数
 * @retval I2C_OK: 全部数据写入成功; I2C_ERROR: 期间发生物理通信故障
 */
i2c_status_t eeprom_write(eeprom_dev_t *eeprom, uint16_t reg_addr, uint8_t *buf, uint16_t len);

/**
 * @brief  EEPROM 测试函数
 * @param  bus: 绑定的物理 I2C 总线对象指针
 * @retval None
 */
int eeprom_test(i2c_bus_t *bus);

#endif /* __EEPROM_H__ */

 ex2.i2c-bitbang/Board/i2c_bitbang.c

New file
@@ -0,0 +1,734 @@
/**********************************************************************
 *   Copyright: (C)2024 LingYun IoT System Studio
 *      Author: GuoWenxue<guowenxue@gmail.com>
 *
 * Description: The purpose of this code is to provide a simple C library,
 *              which providing software bit-bang of the I2C protocol on
 *              any GPIO pins for ISKBoard.
 *
 *   ChangeLog:
 *        Version    Date       Author            Description
 *        V1.0.0  2024.08.29    GuoWenxue      Release initial version
 *
 ***********************************************************************/

#include <stdbool.h>
#include <stdio.h>
#include "miscdev.h"  /* udelay() */
#include "i2c_bitbang.h"

/* I2C1 bus instance for SHT20, RTC, OLED on board */
i2c_bus_t i2c1_bus =
{
    .lock = ATOMIC_VAR_INIT(false),
    .addr = 0x00,
    .scl  = {GPIOB, GPIO_PIN_6},
    .sda  = {GPIOB, GPIO_PIN_7},
};

/* I2C2 bus instance on MikroBUS */
i2c_bus_t i2c2_bus =
{
    .lock = ATOMIC_VAR_INIT(false),
    .addr = 0x00,
    .scl  = {GPIOB, GPIO_PIN_10},
    .sda  = {GPIOB, GPIO_PIN_11},
};

/*
 *+---------------------------------+
 *|  I2C GPIO port Level functions  |
 *+---------------------------------+
 */

/**
 * @brief  Initialize I2C GPIO pins
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
void i2c_gpio_init(i2c_bus_t *bus)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    /* Enable GPIO clocks */
    gpio_clk_enable(bus->scl.group);
    gpio_clk_enable(bus->sda.group);

    /* Configure SCL pin */
    GPIO_InitStruct.Pin = bus->scl.pin;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;  /* Open-drain output */
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(bus->scl.group, &GPIO_InitStruct);

    /* Configure SDA pin */
    GPIO_InitStruct.Pin = bus->sda.pin;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;  /* Open-drain output */
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(bus->sda.group, &GPIO_InitStruct);

    /* Set both pins to HIGH (idle state) */
    HAL_GPIO_WritePin(bus->scl.group, bus->scl.pin, GPIO_PIN_SET);
    HAL_GPIO_WritePin(bus->sda.group, bus->sda.pin, GPIO_PIN_SET);
}

/**
 * @brief  Set SCL pin level
 * @param  bus: pointer to I2C bus structure
 * @param  level: LOW or HIGH
 * @retval None
 */
static inline void i2c_scl_set(i2c_bus_t *bus, uint8_t level)
{
    HAL_GPIO_WritePin(bus->scl.group, bus->scl.pin, level?GPIO_PIN_SET:GPIO_PIN_RESET);
}

/**
 * @brief  Set SDA pin level
 * @param  bus: pointer to I2C bus structure
 * @param  level: LOW or HIGH
 * @retval None
 */
static inline void i2c_sda_set(i2c_bus_t *bus, uint8_t level)
{
    HAL_GPIO_WritePin(bus->sda.group, bus->sda.pin, level?GPIO_PIN_SET:GPIO_PIN_RESET);
}

/**
 * @brief  Read SDA pin level
 * @param  bus: pointer to I2C bus structure
 * @retval pin level (0 or 1)
 */
static uint8_t i2c_sda_read(i2c_bus_t *bus)
{
    return (HAL_GPIO_ReadPin(bus->sda.group, bus->sda.pin) == GPIO_PIN_SET) ? 1 : 0;
}


/*
 *+---------------------------------+
 *|    I2C bus control function     |
 *+---------------------------------+
 */

/**
 * @brief  工业级模拟 I2C 总线初始化 (带硬件死锁九脉冲自愈)
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
void i2c_init(i2c_bus_t *bus)
{
    if (!bus)
    {
        return;
    }

    /* 1. 初始化 I2C GPIO 口 */
    i2c_gpio_init(bus);

    /* 2. 连续发送 9 个 SCL 时钟脉冲 */
    i2c_sda_set(bus, HIGH);
    for (int i = 0; i < 9; i++)
    {
        i2c_scl_set(bus, LOW);
        udelay(I2C_DELAY_US);
        i2c_scl_set(bus, HIGH);
        udelay(I2C_DELAY_US);
    }

    /* 3. 补发一个结束信号，强迫所有从机回到空闲态 */
    i2c_scl_set(bus, LOW);
    udelay(I2C_DELAY_US);
    i2c_sda_set(bus, LOW);
    udelay(I2C_DELAY_US);
    i2c_scl_set(bus, HIGH);
    udelay(I2C_DELAY_US);
    i2c_sda_set(bus, HIGH);
    udelay(I2C_DELAY_US);
}

/**
 * @brief  Deinitialize I2C GPIO pins
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
void i2c_deinit(i2c_bus_t *bus)
{
    HAL_GPIO_DeInit(bus->scl.group, bus->scl.pin);
    HAL_GPIO_DeInit(bus->sda.group, bus->sda.pin);
    atomic_store(&bus->lock, false);
}

/**
 * @brief  绑定设备及地址到 I2C 总线上
 */
int i2c_bind_dev(i2c_dev_t *dev, i2c_bus_t *bus, uint8_t dev_addr)
{
    if (!dev || !bus)
    {
        return -1;
    }

    dev->bus = bus;
    dev->dev_addr = dev_addr;

    return 0;
}

/**
 * @brief  将I2C总线加锁让设备独占总线
 */
int i2c_lock_dev(i2c_dev_t *dev)
{
    if( !dev || !dev->bus )
    {
        return -1;
    }

    /* 安全上锁，若总线被占用则在此阻塞等待 */
    if( I2C_OK != i2c_lock(dev->bus) )
    {
        return -2;
    }

    return 0;
}

/**
 * @brief  释放设备的 I2C 总线锁
 */
void i2c_free_dev(i2c_dev_t *dev)
{
    if (!dev || !dev->bus)
    {
        return;
    }

    /* 1. 释放总线锁，让其他外设可以竞争总线 */
    i2c_unlock(dev->bus);
}

/**
 * @brief  Lock I2C bus for exclusive access (bare metal mutex)
 * @param  bus: pointer to I2C bus structure
 * @retval I2C_OK if success, I2C_BUSY if bus is locked
 */
i2c_status_t i2c_lock(i2c_bus_t *bus)
{
    uint32_t timeout = 10000;

    /* atomic_compare_exchange_weak 会原子性地检查 bus->lock 是否为 false。
     * 如果是 false，就把它设置为 true，并返回 true；
     * 如果已经是 true，则返回 false，进入循环等待。
     */
    while (timeout > 0)
    {
        _Bool expected = false;
        if (atomic_compare_exchange_weak(&bus->lock, &expected, true))
        {
            return I2C_OK;
        }
        udelay(10);
        timeout--;
    }

    return I2C_BUSY;
}

/**
 * @brief  Unlock I2C bus
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
void i2c_unlock(i2c_bus_t *bus)
{
    atomic_store(&bus->lock, false);
}

/**
 * @brief  Scan I2C bus for connected devices
 * @param  bus: pointer to I2C bus structure
 * @retval none
 */
void i2c_scan(i2c_bus_t *bus)
{
    uint8_t addr;
    int found = 0;

    if (i2c_lock(bus) != I2C_OK) {
        printf("I2C bus lock failed!\r\n");
        return;
    }

    printf("Scanning I2C bus...\r\n");

    /*10-bit 地址前缀保留区（0x70 ~ 0x77）*/
    for (addr = 0x03; addr < 0x70; addr++) {
        i2c_start(bus);
        i2c_write_byte(bus, (addr << 1) | 0x01);  // read mode

        if (i2c_wait_ack(bus) == I2C_ACK) {
            printf("Found device at 0x%02X\r\n", addr);
            found = 1;
        }

        i2c_stop(bus);
        udelay(100);
    }

    i2c_unlock(bus);

    if (!found) {
        printf("No I2C devices found.\r\n");
    }
}


/*
 *+---------------------------------+
 *|  I2C timing sequence function   |
 *+---------------------------------+
 */

/**
 * @brief  Generate I2C start condition
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
void i2c_start(i2c_bus_t *bus)
{
    /* Start Condition Timing Sequence:
              ______
     SCL:           |___
            _____
     SDA:        |_____
    */

    /* 无论前序是空闲还是刚结束 ACK，先确保 SCL 为低时 SDA 释放为高 */
    i2c_sda_set(bus, HIGH);
    i2c_scl_set(bus, LOW);
    udelay(I2C_DELAY_US);

    /* 此时拉高 SCL，SDA 必然处于稳定的高电平 */
    i2c_scl_set(bus, HIGH);
    i2c_sda_set(bus, HIGH);
    udelay(I2C_DELAY_US);

    /* 在 SCL 为高期间拉低 SDA，制造标准的 START / RESTART 沿 */
    i2c_sda_set(bus, LOW);
    udelay(I2C_DELAY_US);

    i2c_scl_set(bus, LOW);
    udelay(I2C_DELAY_US);
}

/**
 * @brief  Generate I2C stop condition
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
void i2c_stop(i2c_bus_t *bus)
{
    /* SCL Stop Condition Timing Sequence:
                _______
      SCL:   ___|
                   _____
      SDA:   _____|
    */

    i2c_scl_set(bus, LOW);
    i2c_sda_set(bus, LOW);
    udelay(I2C_DELAY_US);

    i2c_scl_set(bus, HIGH);
    udelay(I2C_DELAY_US);

    i2c_sda_set(bus, HIGH);
    udelay(I2C_DELAY_US);
}

/**
 * @brief  Wait for ACK from slave
 * @param  bus: pointer to I2C bus structure
 * @retval I2C_ACK or I2C_NACK
 */
i2c_ack_t i2c_wait_ack(i2c_bus_t *bus)
{
    uint16_t timeout = 0;

    i2c_sda_set(bus, HIGH); /* 释放SDA线允许从机控制 */
    udelay(I2C_DELAY_US);

    i2c_scl_set(bus, HIGH);
    udelay(I2C_DELAY_US); /* 确保SCL高电平波形稳定 */

    while (i2c_sda_read(bus))
    {
        timeout++;
        if (timeout > I2C_TIMEOUT_COUNT)
        {
            break; /* 超时退出，返回NACK */
        }
    }

    i2c_scl_set(bus, LOW);
    udelay(I2C_DELAY_US);

    return (timeout > I2C_TIMEOUT_COUNT) ? I2C_NACK : I2C_ACK;
}

/**
 * @brief  Send ACK to slave
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
void i2c_send_ack(i2c_bus_t *bus)
{
    i2c_scl_set(bus, LOW);
    i2c_sda_set(bus, LOW);
    udelay(I2C_DELAY_US);

    i2c_scl_set(bus, HIGH);
    udelay(I2C_DELAY_US);

    i2c_scl_set(bus, LOW);
    udelay(I2C_DELAY_US);
}

/**
 * @brief  Send NACK to slave
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
void i2c_send_nack(i2c_bus_t *bus)
{
    i2c_scl_set(bus, LOW);
    i2c_sda_set(bus, HIGH);
    udelay(I2C_DELAY_US);

    i2c_scl_set(bus, HIGH);
    udelay(I2C_DELAY_US);

    i2c_scl_set(bus, LOW);
    udelay(I2C_DELAY_US);
}

/**
 * @brief  Write one byte to I2C bus
 * @param  bus: pointer to I2C bus structure
 * @param  byte: byte to write
 * @retval None
 */
void i2c_write_byte(i2c_bus_t *bus, uint8_t byte)
{
    uint8_t i;

    i2c_scl_set(bus, LOW);

    for (i = 0; i < 8; i++)
    {
        i2c_sda_set(bus, (byte & 0x80) ? HIGH : LOW);
        udelay(I2C_DELAY_US); /* 数据建立时间 Setup Time */

        i2c_scl_set(bus, HIGH);
        udelay(I2C_DELAY_US); /* 保持高电平采样 */

        i2c_scl_set(bus, LOW);
        udelay(I2C_DELAY_US); /* 确保时钟低电平持续时间 */

        byte <<= 1;
    }
}

/**
 * @brief  Read one byte from I2C bus
 * @param  bus: pointer to I2C bus structure
 * @retval received byte
 */
uint8_t i2c_read_byte(i2c_bus_t *bus)
{
    uint8_t i;
    uint8_t byte = 0;

    i2c_sda_set(bus, HIGH);
    udelay(I2C_DELAY_US);

    for (i = 0; i < 8; i++)
    {
        byte <<= 1;

        i2c_scl_set(bus, HIGH);
        udelay(I2C_DELAY_US); /* 延时确保 SCL 电平平稳后采样 */

        if (i2c_sda_read(bus))
        {
            byte |= 0x01;
        }

        i2c_scl_set(bus, LOW);
        udelay(I2C_DELAY_US); /* 确保时钟低电平持续时间 */
    }

    return byte;
}


/*
 *+-----------------------------------+
 *|      I2C read/write function      |
 *+-----------------------------------+
 */

/**
 * @brief  Write data to I2C slave device
 * @param  bus: pointer to I2C bus structure
 * @param  addr: 7-bit slave address
 * @param  reg: register address
 * @param  data: pointer to data buffer
 * @param  len: data length
 * @retval I2C status
 */
i2c_status_t i2c_write(i2c_bus_t *bus, uint8_t addr, uint8_t reg, uint8_t *data, uint16_t len)
{
    uint16_t i;
    int rv = I2C_OK;

    i2c_start(bus);

    /* Send slave address + write bit */
    i2c_write_byte(bus, (addr << 1) | 0x00);
    if (i2c_wait_ack(bus) != I2C_ACK)
    {
        rv = I2C_ERROR;
        goto cleanup;
    }

    /* Send register address */
    i2c_write_byte(bus, reg);
    if (i2c_wait_ack(bus) != I2C_ACK)
    {
        rv = I2C_ERROR;
        goto cleanup;
    }

    /* Send data */
    for (i = 0; i < len; i++)
    {
        i2c_write_byte(bus, data[i]);
        if (i2c_wait_ack(bus) != I2C_ACK)
        {
            rv = I2C_ERROR;
            goto cleanup;
        }
    }

cleanup:
    i2c_stop(bus);
    return rv;
}

/**
 * @brief  Read data from I2C slave device
 * @param  bus: pointer to I2C bus structure
 * @param  addr: 7-bit slave address
 * @param  reg: register address
 * @param  data: pointer to data buffer
 * @param  len: data length
 * @retval I2C status
 */
i2c_status_t i2c_read(i2c_bus_t *bus, uint8_t addr, uint8_t reg, uint8_t *data, uint16_t len)
{
    uint16_t i;
    int rv = I2C_OK;

    /* Write register address */
    i2c_start(bus);
    i2c_write_byte(bus, (addr << 1) | 0x00);
    if (i2c_wait_ack(bus) != I2C_ACK)
    {
        rv = I2C_ERROR;
        goto cleanup;
    }

    i2c_write_byte(bus, reg);
    if (i2c_wait_ack(bus) != I2C_ACK)
    {
        rv = I2C_ERROR;
        goto cleanup;
    }

    /* Restart and read data */
    i2c_start(bus);
    i2c_write_byte(bus, (addr << 1) | 0x01);
    if (i2c_wait_ack(bus) != I2C_ACK)
    {
        rv = I2C_ERROR;
        goto cleanup;
    }

    for (i = 0; i < len; i++)
    {
        data[i] = i2c_read_byte(bus);

        if (i < len - 1)
        {
            i2c_send_ack(bus);
        }
        else
        {
            i2c_send_nack(bus);
        }
    }

cleanup:
    i2c_stop(bus);
    return rv;
}

/**
 * @brief  Write data to I2C slave device without register address
 * @param  bus: pointer to I2C bus structure
 * @param  addr: 7-bit slave address
 * @param  data: pointer to data buffer
 * @param  len: data length
 * @retval I2C status
 */
i2c_status_t i2c_write_no_reg(i2c_bus_t *bus, uint8_t addr, uint8_t *data, uint16_t len)
{
    uint16_t i;
    int rv = I2C_OK;

    i2c_start(bus);

    /* Send slave address + write bit */
    i2c_write_byte(bus, (addr << 1) | 0x00);
    if (i2c_wait_ack(bus) != I2C_ACK)
    {
        rv = I2C_ERROR;
        goto cleanup;
    }

    /* Send data */
    for (i = 0; i < len; i++)
    {
        i2c_write_byte(bus, data[i]);
        if (i2c_wait_ack(bus) != I2C_ACK)
        {
            rv = I2C_ERROR;
            goto cleanup;
        }
    }

cleanup:
    i2c_stop(bus);
    return rv;
}

/**
 * @brief  Read data from I2C slave device without register address
 * @param  bus: pointer to I2C bus structure
 * @param  addr: 7-bit slave address
 * @param  data: pointer to data buffer
 * @param  len: data length
 * @retval I2C status
 */
i2c_status_t i2c_read_no_reg(i2c_bus_t *bus, uint8_t addr, uint8_t *data, uint16_t len)
{
    uint16_t i;
    int rv = I2C_OK;

    i2c_start(bus);

    /* Send slave address + read bit */
    i2c_write_byte(bus, (addr << 1) | 0x01);
    if (i2c_wait_ack(bus) != I2C_ACK)
    {
        rv = I2C_ERROR;
        goto cleanup;
    }

    /* Read data */
    for (i = 0; i < len; i++)
    {
        data[i] = i2c_read_byte(bus);

        if (i < len - 1)
        {
            i2c_send_ack(bus);
        }
        else
        {
            i2c_send_nack(bus);
        }
    }

cleanup:
    i2c_stop(bus);
    return rv;
}


/*
 *+-----------------------------------+
 *| Linux I2C API–compatible function |
 *+-----------------------------------+
 */

 /* Functions compatible with the Linux I2C adapter API */
i2c_status_t i2c_transfer(i2c_bus_t *bus, i2c_msg_t *msgs, int num)
{
    i2c_status_t status = I2C_OK;
    int i, j;

    for (i = 0; i < num; i++)
    {
        i2c_msg_t *msg = &msgs[i];

        /* 1. 每条消息都以 Start (或 Repeated Start) 开始 */
        i2c_start(bus);

        /* 2. 发送从机地址 + 读写位 */
        uint8_t dir = (msg->flags & I2C_M_RD) ? 0x01 : 0x00;
        i2c_write_byte(bus, (msg->addr << 1) | dir);
        if (i2c_wait_ack(bus) != I2C_ACK)
        {
            status = I2C_ERROR;
            goto cleanup;
        }

        /* 3. 根据读写标志传输主体数据 */
        if (msg->flags & I2C_M_RD)
        {
            /* 读模式 */
            for (j = 0; j < msg->len; j++)
            {
                msg->buf[j] = i2c_read_byte(bus);
                /* 只要不是当前消息的最后一个字节，就回复 ACK */
                if (j < msg->len - 1)
                    i2c_send_ack(bus);
                else
                    i2c_send_nack(bus);
            }
        }
        else
        {
            /* 写模式 */
            for (j = 0; j < msg->len; j++)
            {
                i2c_write_byte(bus, msg->buf[j]);
                if (i2c_wait_ack(bus) != I2C_ACK)
                {
                    status = I2C_ERROR;
                    goto cleanup;
                }
            }
        }
    }

cleanup:
    /* 4. 只有当所有消息都传输完毕，或者中途出错时，才发送 Stop 释放总线 */
    i2c_stop(bus);

    return status;
}

 ex2.i2c-bitbang/Board/i2c_bitbang.h

New file
@@ -0,0 +1,269 @@
/**********************************************************************
 *   Copyright: (C)2024 LingYun IoT System Studio
 *      Author: GuoWenxue<guowenxue@gmail.com>
 *
 * Description: The purpose of this code is to provide a simple C library,
 *              which providing software bit-bang of the I2C protocol on
 *              any GPIO pins for ISKBoard.
 *
 *   ChangeLog:
 *        Version    Date       Author            Description
 *        V1.0.0  2024.08.29    GuoWenxue      Release initial version
 *
 ***********************************************************************/

#ifndef __I2C_BITBANG_H
#define __I2C_BITBANG_H

#include "stm32l4xx_hal.h"
#include <stdint.h>
#include <stdatomic.h>

#define I2C_DELAY_US        5       /* I2C timing delay in microseconds */
#define I2C_TIMEOUT_COUNT   100     /* Timeout counter for waiting ACK */

/* GPIO port for I2C typedef */
typedef struct i2c_gpio_s
{
    GPIO_TypeDef           *group; /* GPIO group */
    uint16_t                pin;   /* GPIO pin   */
} i2c_gpio_t;

/* I2C bus typedef */
typedef struct i2c_bus_s
{
    volatile atomic_bool    lock;   /* Bus lock flag */
    uint8_t                 addr;   /* 7-bits slave address */
    i2c_gpio_t              scl;    /* SCL GPIO pin */
    i2c_gpio_t              sda;    /* SDA GPIO pin */
} i2c_bus_t;

/* GPIO level enum */
enum
{
    LOW  = 0,
    HIGH = 1,
};

/* I2C ACK/NACK enum */
typedef enum
{
    I2C_ACK  = 0,
    I2C_NACK = 1
} i2c_ack_t;

/* I2C status enum */
typedef enum
{
    I2C_OK       = 0,
    I2C_ERROR    = 1,
    I2C_TIMEOUT  = 2,
    I2C_BUSY     = 3
} i2c_status_t;

/*
 *+---------------------------------+
 *|    I2C bus control function     |
 *+---------------------------------+
 */

/* I2C1 bus instance for SHT20, RTC, OLED on board */
extern i2c_bus_t i2c1_bus;

/* I2C2 bus instance on MikroBUS */
extern i2c_bus_t i2c2_bus;

/**
 * @brief  Initialize I2C GPIO pins
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
extern void i2c_init(i2c_bus_t *bus);

/**
 * @brief  Deinitialize I2C GPIO pins
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
extern void i2c_deinit(i2c_bus_t *bus);

/**
 * @brief  通用 I2C 设备属性结构体
 */
typedef struct {
    i2c_bus_t *bus;         /* 绑定的 I2C 物理总线实例 */
    uint8_t dev_addr;       /* 7位设备物理从机地址 */
} i2c_dev_t;

/**
 * @brief  绑定设备及地址到 I2C 总线上
 * @param  dev:      I2C 设备结构体指针
 * @param  bus:      物理总线指针
 * @param  dev_addr: 7位从机地址
 * @retval 0: 成功; -1: 失败
 */
extern int i2c_bind_dev(i2c_dev_t *dev, i2c_bus_t *bus, uint8_t dev_addr);


/**
 * @brief  将I2C总线加锁让设备独占总线
 * @param  dev:      I2C 设备结构体指针
 * @retval 0: 成功; -1: 失败
 */
extern int i2c_lock_dev(i2c_dev_t *dev);

/**
 * @brief  释放设备的 I2C 总线锁
 * @param  dev:      I2C 设备结构体指针
 * @retval 无
 */
extern void i2c_free_dev(i2c_dev_t *dev);

/**
 * @brief  Lock I2C bus for exclusive access (bare metal mutex)
 * @param  bus: pointer to I2C bus structure
 * @retval I2C_OK if success, I2C_BUSY if bus is locked
 */
extern i2c_status_t i2c_lock(i2c_bus_t *bus);

/**
 * @brief  Unlock I2C bus
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
extern void i2c_unlock(i2c_bus_t *bus);

/**
 * @brief  Scan I2C bus for connected devices
 * @param  bus: pointer to I2C bus structure
 * @retval none
 */
extern void i2c_scan(i2c_bus_t *bus);


/*
 *+---------------------------------+
 *|  I2C timing sequence function   |
 *+---------------------------------+
 */

 /**
 * @brief  Generate I2C start condition
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
 extern void i2c_start(i2c_bus_t *bus);

/**
 * @brief  Generate I2C stop condition
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
 extern void i2c_stop(i2c_bus_t *bus);

 /**
 * @brief  Wait for ACK from slave
 * @param  bus: pointer to I2C bus structure
 * @retval I2C_ACK or I2C_NACK
 */
extern i2c_ack_t i2c_wait_ack(i2c_bus_t *bus);

/**
 * @brief  Send ACK to slave
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
extern void i2c_send_ack(i2c_bus_t *bus);

/**
 * @brief  Send NACK to slave
 * @param  bus: pointer to I2C bus structure
 * @retval None
 */
extern void i2c_send_nack(i2c_bus_t *bus);

/**
 * @brief  Write one byte to I2C bus
 * @param  bus: pointer to I2C bus structure
 * @param  byte: byte to write
 * @retval None
 */
extern void i2c_write_byte(i2c_bus_t *bus, uint8_t byte);

/**
 * @brief  Read one byte from I2C bus
 * @param  bus: pointer to I2C bus structure
 * @retval received byte
 */
extern uint8_t i2c_read_byte(i2c_bus_t *bus);


/*
 *+-----------------------------------+
 *|      I2C read/write function      |
 *+-----------------------------------+
 */

/**
 * @brief  Write data to I2C slave device
 * @param  bus: pointer to I2C bus structure
 * @param  addr: 7-bit slave address
 * @param  reg: register address
 * @param  data: pointer to data buffer
 * @param  len: data length
 * @retval I2C status
 */
extern i2c_status_t i2c_write(i2c_bus_t *bus, uint8_t addr, uint8_t reg, uint8_t *data, uint16_t len);

/**
 * @brief  Read data from I2C slave device
 * @param  bus: pointer to I2C bus structure
 * @param  addr: 7-bit slave address
 * @param  reg: register address
 * @param  data: pointer to data buffer
 * @param  len: data length
 * @retval I2C status
 */
extern i2c_status_t i2c_read(i2c_bus_t *bus, uint8_t addr, uint8_t reg, uint8_t *data, uint16_t len);

/**
 * @brief  Write data to I2C slave device without register address
 * @param  bus: pointer to I2C bus structure
 * @param  addr: 7-bit slave address
 * @param  data: pointer to data buffer
 * @param  len: data length
 * @retval I2C status
 */
extern i2c_status_t i2c_write_no_reg(i2c_bus_t *bus, uint8_t addr, uint8_t *data, uint16_t len);

/**
 * @brief  Read data from I2C slave device without register address
 * @param  bus: pointer to I2C bus structure
 * @param  addr: 7-bit slave address
 * @param  data: pointer to data buffer
 * @param  len: data length
 * @retval I2C status
 */
extern i2c_status_t i2c_read_no_reg(i2c_bus_t *bus, uint8_t addr, uint8_t *data, uint16_t len);


/*
 *+-----------------------------------+
 *| Linux I2C API–compatible function |
 *+-----------------------------------+
 */

#define I2C_M_WR           0x0000  /* 写控制标志 */
#define I2C_M_RD           0x0001  /* 读控制标志 */

typedef struct {
    uint8_t  addr;    /* 7位从机地址 */
    uint16_t flags;   /* I2C_M_WR 或 I2C_M_RD */
    uint16_t len;     /* 数据长度 */
    uint8_t  *buf;    /* 数据指针 */
} i2c_msg_t;

/* Functions compatible with the Linux I2C adapter API */
extern i2c_status_t i2c_transfer(i2c_bus_t *bus, i2c_msg_t *msgs, int num);

#endif /* __I2C_BITBANG_H */

 ex2.i2c-bitbang/Board/isl1208.c

New file
@@ -0,0 +1,367 @@
/**********************************************************************
 * Copyright: (C)2026 LingYun IoT System Studio
 * Author: GuoWenxue<guowenxue@gmail.com>
 *
 * Description: ISL1208 RTC driver on ISKBoard (Unlocked Core Pattern)
 *
 * ChangeLog:
 * Version    Date       Author            Description
 * V1.1.0  2026.07.08    GuoWenxue      Refactor with unlocked core functions
 *
 ***********************************************************************/

#include <stdio.h>
#include "isl1208.h"

/* 隐藏在私有源文件内部的 ISL1208 寄存器映射与参数 */
#define ISL1208_I2C_ADDR        0x6F

#define ISL1208_REG_SC          0x00    /* 秒 (00-59) */
#define ISL1208_REG_MN          0x01    /* 分 (00-59) */
#define ISL1208_REG_HR          0x02    /* 时 (24小时模式) */
#define ISL1208_REG_DT          0x03    /* 日 (01-31) */
#define ISL1208_REG_MO          0x04    /* 月 (01-12) */
#define ISL1208_REG_YR          0x05    /* 年 (00-99) */
#define ISL1208_REG_DW          0x06    /* 星期 (00-06) */

#define ISL1208_REG_SR          0x07    /* 状态寄存器 */
#define ISL1208_SR_RTCF         0x80    /* 掉电/晶振失效标志位 */
#define ISL1208_SR_WRTC         0x10    /* 写使能位 */

/* 前置私有静态辅助函数声明 (无锁底层业务函数) */
static int __isl1208_set_time_unlocked(const rtc_time_t *time);
static int __isl1208_get_time_unlocked(rtc_time_t *time);

/*
 *+---------------------------------+
 *|     RTC 公共接口函数(带锁)       |
 *+---------------------------------+
 */

/* I2C 设备 RTC */
static i2c_dev_t rtc;

/**
 * @brief  ISL1208 硬件初始化与掉电自愈函数
 * @note   只有检测到掉电(RTCF=1)或停振(ST=1)时，才强制清理控制位并激活时钟，平时不干扰原有走时
 * @param  bus: 绑定的 I2C 物理总线指针 (如 &i2c1_bus)
 * @retval 0: 初始化成功; -1: 总线通信失败或芯片未响应
 */
int isl1208_init(i2c_bus_t *bus)
{
    uint8_t sr_val;
    uint8_t sc_val;
    int rv = -1;

    if (!bus)
        return -1;

    /* 绑定设备及其设备号到 I2C 总线上 */
    i2c_bind_dev(&rtc, bus, ISL1208_I2C_ADDR);

    /* 将I2C总线加锁让设备独占总线 */
    i2c_lock_dev(&rtc);

    /* 读取当前状态寄存器 (检查 RTCF) */
    if (i2c_read(rtc.bus, rtc.dev_addr, ISL1208_REG_SR, &sr_val, 1) != I2C_OK)
    {
        goto cleanup;
    }

    /* 读取当前秒寄存器 (检查 ST) */
    if (i2c_read(rtc.bus, rtc.dev_addr, ISL1208_REG_SC, &sc_val, 1) != I2C_OK)
    {
        goto cleanup;
    }

    /* 条件触发：只要 SBIB 位为 1 证明是断电冷启动，必须强制清除解冻 */
    if (sr_val & 0x01)
    {
        printf("ISL1208 Power-Loss or Stop detected! Activating oscillator...\r\n");

        /* 强开写保护 (WRTC=1)，并抹除 SBIB 冻结位 */
        sr_val = ISL1208_SR_WRTC;
        if (i2c_write(rtc.bus, rtc.dev_addr, ISL1208_REG_SR, &sr_val, 1) != I2C_OK)
        {
            goto cleanup;
        }

        /* 写入完整的 2026-01-01 00:00:00 (星期四) 基准时间 */
        uint8_t init_buf[7];
        init_buf[0] = 0x00; /* 00秒，同时最高位 ST=0 激活晶振起振 */
        init_buf[1] = 0x00; /* 00分 */
        init_buf[2] = 0x80; /* 00时，Bit7=1 代表开启 24 小时制 */
        init_buf[3] = 0x01; /* 01日 (BCD: 0x01) */
        init_buf[4] = 0x01; /* 01月 (BCD: 0x01) */
        init_buf[5] = 0x26; /* 26年 (BCD: 0x26 代表 2026年) */
        init_buf[6] = 0x04; /* 星期四 (BCD: 0x04) */

        /* 写入 7 个时间寄存器 */
        if (i2c_write(rtc.bus, rtc.dev_addr, ISL1208_REG_SC, init_buf, 7) != I2C_OK)
        {
            goto cleanup;
        }

        /* 强制将秒寄存器的最高位 ST (Stop) 清零以激活晶振 */
        sc_val &= 0x7F;
        if (i2c_write(rtc.bus, rtc.dev_addr, ISL1208_REG_SC, &sc_val, 1) != I2C_OK)
        {
            goto cleanup;
        }

        /* 关闭写保护，并将状态寄存器洗干净 (SBIB 清零) */
        sr_val = 0x00;
        if (i2c_write(rtc.bus, rtc.dev_addr, ISL1208_REG_SR, &sr_val, 1) != I2C_OK)
        {
            goto cleanup;
        }
    }

    rv = 0;

cleanup:
    i2c_free_dev(&rtc);
    return rv;
}

/**
 * @brief  应用层设置 RTC 时间接口函数（rtc_time_t格式）
 * @param  time  指向待写入时间数据的 rtc_time_t 结构体常指针
 * @retval 0:成功, -1:失败
 */
int isl1208_set_time(const rtc_time_t *time)
{
    int rv = -1;

    if (!rtc.bus || !time)
    {
        return -1;
    }

    i2c_lock_dev(&rtc);

    /* 调用无锁底层核心实现写操作 */
    rv = __isl1208_set_time_unlocked(time);

    i2c_free_dev(&rtc);

    return rv;
}

/**
 * @brief  应用层设置 RTC 时间接口函数（字符串格式）
 * @param  time_str  输入的时间字符串指针，格式如 "2026-01-01 10:00:00"
 * @retval 0:成功, -1:失败
 */
int isl1208_set_time_str(const char *time_str)
{
    rtc_time_t tm;
    int year, month, day, hour, minute, second;

    if (!time_str)
    {
        return -1;
    }

    /* 1. 解析时间字符串 */
    if (sscanf(time_str, "%d-%d-%d %d:%d:%d",
               &year, &month, &day, &hour, &minute, &second) != 6)
    {
        return -1;
    }

    /* 2. 填充结构体（年份仅保留低两位） */
    tm.year    = year % 100;
    tm.month   = month;
    tm.day     = day;
    tm.hour    = hour;
    tm.minute  = minute;
    tm.second  = second;
    tm.weekday = 0;

    /* 3. 直接调用带锁的原本接口 */
    return isl1208_set_time(&tm);
}

/**
 * @brief  应用层获取 RTC 时间接口函数
 * @param  time  指向用于接收时间数据的 rtc_time_t 结构体指针
 * @retval 0:成功, -1:失败
 */
int isl1208_get_time(rtc_time_t *time)
{
    int rv = -1;

    if (!rtc.bus || !time)
    {
        return -1;
    }

    i2c_lock_dev(&rtc);

    /* 调用无锁底层核心实现读操作 */
    rv = __isl1208_get_time_unlocked(time);

    i2c_free_dev(&rtc);
    return rv;
}

/**
 * @brief  应用层获取 RTC 时间接口函数（字符串格式）
 * @param  buf      用于存储格式化时间字符串的缓冲区指针
 * @param  buf_len  接收缓冲区长度（建议至少20字节）
 * @retval 0:成功, -1:失败
 */
int isl1208_get_time_str(char *buf, size_t buf_len)
{
    rtc_time_t tm;
    int rv = -1;

    if (!buf || buf_len < 20)
    {
        return -1;
    }

    /* 直接调用带锁的原本接口获取时间结构体 */
    rv = isl1208_get_time(&tm);
    if (rv != 0)
    {
        return rv;
    }

    /* 格式化为字符串输出 */
    snprintf(buf, buf_len, "20%02d-%02d-%02d %02d:%02d:%02d",
             tm.year, tm.month, tm.day,
             tm.hour, tm.minute, tm.second);

    return 0;
}

/**
 * @brief  获取并格式化打印当前 RTC 时间接口函数
 * @param  bus  指向已初始化的 I2C 总线结构体指针
 * @retval 0:成功, -1:失败
 */
int isl1208_print_time(void)
{
    char time_str[32];

    /* 直接调用刚刚封装好的获取字符串接口 */
    if (isl1208_get_time_str(time_str, sizeof(time_str)) != 0)
    {
        return -1;
    }

    /* 格式化输出 */
    printf("ISL1208 Time: %s\r\n", time_str);
    return 0;
}

/*
 *+---------------------------------+
 *|     RTC 私有底层函数(无锁)       |
 *+---------------------------------+
 */

/**
 * @brief  十进制转 BCD 码
 */
static inline uint8_t rtc_dec_to_bcd(uint8_t dec)
{
    uint8_t high;
    uint8_t low;

    high = dec / 10;
    low = dec % 10;

    return (uint8_t)((high << 4) | low);
}

/**
 * @brief  BCD 码转十进制
 */
static inline uint8_t rtc_bcd_to_dec(uint8_t bcd)
{
    uint8_t high;
    uint8_t low;

    high = bcd >> 4;
    low = bcd & 0x0F;

    return (uint8_t)((high * 10) + low);
}

/**
 * @brief  向 RTC 芯片写入时间
 */
static int __isl1208_set_time_unlocked(const rtc_time_t *time)
{
    uint8_t time_buf[7];
    uint8_t sr_val;

    if( !rtc.bus )
        return -1;

    /* 读取当前状态寄存器 */
    if (i2c_read(rtc.bus, ISL1208_I2C_ADDR, ISL1208_REG_SR, &sr_val, 1) != I2C_OK)
    {
        return -1;
    }

    /* 解除 RTC 写保护 (WRTC 置 1) */
    sr_val |= ISL1208_SR_WRTC;
    if (i2c_write(rtc.bus, ISL1208_I2C_ADDR, ISL1208_REG_SR, &sr_val, 1) != I2C_OK)
    {
        return -1;
    }

    /* 将标准十进制转换为 BCD 码并打包 */
    time_buf[0] = rtc_dec_to_bcd(time->second);
    time_buf[1] = rtc_dec_to_bcd(time->minute);
    time_buf[2] = (rtc_dec_to_bcd(time->hour) & 0x3F) | 0x80;
    time_buf[3] = rtc_dec_to_bcd(time->day);
    time_buf[4] = rtc_dec_to_bcd(time->month);
    time_buf[5] = rtc_dec_to_bcd(time->year);
    time_buf[6] = rtc_dec_to_bcd(time->weekday);

    /* 写入 7 个时间寄存器 */
    if (i2c_write(rtc.bus, ISL1208_I2C_ADDR, ISL1208_REG_SC, time_buf, 7) != I2C_OK)
    {
        return -1;
    }

    /* 恢复写保护并同时清除掉电失效位 (WRTC = 0, RTCF = 0) */
    sr_val &= ~ISL1208_SR_WRTC;
    sr_val &= ~ISL1208_SR_RTCF;
    if (i2c_write(rtc.bus, ISL1208_I2C_ADDR, ISL1208_REG_SR, &sr_val, 1) != I2C_OK)
    {
        return -1;
    }

    return 0;
}

/**
 * @brief  从 RTC 芯片读取时间
 */
static int __isl1208_get_time_unlocked(rtc_time_t *time)
{
    uint8_t time_buf[7];

    /* 连续读取 7 个寄存器的原始 BCD 数据 */
    if (i2c_read(rtc.bus, ISL1208_I2C_ADDR, ISL1208_REG_SC, time_buf, 7) != I2C_OK)
    {
        return -1;
    }

    /* 解析 BCD 码并做去噪掩码隔离 */
    time->second  = rtc_bcd_to_dec(time_buf[0] & 0x7F);
    time->minute  = rtc_bcd_to_dec(time_buf[1] & 0x7F);
    time->hour    = rtc_bcd_to_dec(time_buf[2] & 0x3F);
    time->day     = rtc_bcd_to_dec(time_buf[3] & 0x3F);
    time->month   = rtc_bcd_to_dec(time_buf[4] & 0x1F);
    time->year    = rtc_bcd_to_dec(time_buf[5]);
    time->weekday = rtc_bcd_to_dec(time_buf[6] & 0x07);

    return 0;
}

 ex2.i2c-bitbang/Board/isl1208.h

New file
@@ -0,0 +1,73 @@
/**********************************************************************
 * Copyright: (C)2026 LingYun IoT System Studio
 * Author: GuoWenxue<guowenxue@gmail.com>
 *
 * Description: ISL1208 RTC driver on ISKBoard
 *
 * ChangeLog:
 * Version    Date       Author            Description
 * V1.0.0  2026.07.08    GuoWenxue      Release initial version
 *
 ************************************************************************/

#ifndef __ISL1208_H
#define __ISL1208_H

#include "i2c_bitbang.h"

/**
 * @brief RTC 时间结构体 (标准十进制格式，应用层直接读写)
 */
typedef struct {
    uint8_t second;   /* 秒: 00 - 59 */
    uint8_t minute;   /* 分: 00 - 59 */
    uint8_t hour;     /* 时: 00 - 23 (固定为24小时制) */
    uint8_t day;      /* 日: 01 - 31 */
    uint8_t month;    /* 月: 01 - 12 */
    uint8_t year;     /* 年: 00 - 99 (代表 2000 - 2099 年) */
    uint8_t weekday;  /* 星期: 00 - 06 (00代表星期天) */
} rtc_time_t;

/**
 * @brief  ISL1208 硬件初始化与掉电自愈函数
 * @param  bus: 绑定的 I2C 物理总线指针 (如 &i2c1_bus)
 * @retval 0: 初始化成功; -1: 总线通信失败或芯片未响应
 */
extern int isl1208_init(i2c_bus_t *bus);

/**
 * @brief  应用层设置 RTC 时间接口函数（rtc_time_t格式）
 * @param  time  指向待写入时间数据的 rtc_time_t 结构体常指针
 * @retval 0:成功, -1:失败
 */
extern int isl1208_set_time(const rtc_time_t *time);

/**
 * @brief  应用层设置 RTC 时间接口函数（字符串格式）
 * @param  time_str  输入的时间字符串指针，格式如 "2026-01-01 10:00:00"
 * @retval 0:成功, -1:失败
 */
extern int isl1208_set_time_str(const char *time_str);

/**
 * @brief  应用层获取 RTC 时间接口函数
 * @param  time  指向用于接收时间数据的 rtc_time_t 结构体指针
 * @retval 0:成功, -1:失败
 */
extern int isl1208_get_time(rtc_time_t *time);

/**
 * @brief  应用层获取 RTC 时间接口函数（字符串格式）
 * @param  buf      用于存储格式化时间字符串的缓冲区指针
 * @param  buf_len  接收缓冲区长度（建议至少20字节）
 * @retval 0:成功, -1:失败
 */
extern int isl1208_get_time_str(char *buf, size_t buf_len);

/**
 * @brief  获取并格式化打印当前 RTC 时间接口函数
 * @retval 0:成功, -1:失败
 */
extern int isl1208_print_time(void);

#endif /* __ISL1208_H */

 ex2.i2c-bitbang/Board/miscdev.c

New file
@@ -0,0 +1,409 @@
/**********************************************************************
*   Copyright: (C)2024 LingYun IoT System Studio
*      Author: GuoWenxue<guowenxue@gmail.com>
* Description: ISKBoard Hardware Abstract Layer driver
*
*   ChangeLog:
*        Version    Date       Author            Description
*        V1.0.0  2024.08.29    GuoWenxue      Release initial version
***********************************************************************/

#include "miscdev.h"

/*
 *+----------------------+
 *|    STM32 GPIO API    |
 *+----------------------+
 */

void gpio_clk_enable(GPIO_TypeDef *port)
{
    if      (port == GPIOA) __HAL_RCC_GPIOA_CLK_ENABLE();
    else if (port == GPIOB) __HAL_RCC_GPIOB_CLK_ENABLE();
    else if (port == GPIOC) __HAL_RCC_GPIOC_CLK_ENABLE();
    else if (port == GPIOD) __HAL_RCC_GPIOD_CLK_ENABLE();
#ifdef GPIOE
    else if (port == GPIOE) __HAL_RCC_GPIOE_CLK_ENABLE();
#endif
#ifdef GPIOF
    else if (port == GPIOF) __HAL_RCC_GPIOF_CLK_ENABLE();
#endif
#ifdef GPIOG
    else if (port == GPIOG) __HAL_RCC_GPIOG_CLK_ENABLE();
#endif
#ifdef GPIOH
    else if (port == GPIOH) __HAL_RCC_GPIOH_CLK_ENABLE();
#endif
}


/*
 *+----------------------+
 *|  GPIO Led/Relay API  |
 *+----------------------+
 */

/* ISKBoard 有一个继电器 */
gpio_t     relay = { "Relay", GPIOD, GPIO_PIN_2, 1 };

/* ISKBoard 有三个Led灯 */
gpio_t     leds[LedMax] =
{
    { "RedLed",   GPIOC, GPIO_PIN_9, 0 },
    { "GreenLed", GPIOC, GPIO_PIN_6, 0 },
    { "BlueLed",  GPIOB, GPIO_PIN_2, 0 },
};

/**
 * @brief  继电器初始化：配置继电器控制引脚对应的GPIO
 */
void init_relay(void)
{
    /* set default output level to inactive */
    HAL_GPIO_WritePin(relay.group, relay.pin, !relay.active);

    return;
}

/**
 * @brief  控制继电器的开关状态
 * @param  status: ON 或 OFF
 */
void turn_relay(int status)
{
    GPIO_PinState       level;

    level = status==OFF ? !relay.active : relay.active;
    HAL_GPIO_WritePin(relay.group, relay.pin, level);
}

/**
 * @brief  LED初始化：配置各LED对应的GPIO状态。
 */
void init_led(void)
{
    int                 which;

    /* Initial all leds GPIO */
    for(which=0; which<LedMax; which++)
    {
        /* set default output level to inactive */
        HAL_GPIO_WritePin(leds[which].group, leds[which].pin, !leds[which].active);
    }

    return;
}

/**
 * @brief  控制指定LED的开关状态
 * @param  which:  LED编号(参考 lednum_t，如 Led_R/Led_G/Led_B)
 * @param  status: ON 或 OFF
 */
void turn_led(int which, int status)
{
    GPIO_PinState       level;

    if( which >= LedMax )
        return ;

    level = status==ON ? leds[which].active : !leds[which].active;
    HAL_GPIO_WritePin(leds[which].group, leds[which].pin, level);
}

/**
 * @brief  翻转指定LED当前状态(亮变灭，灭变亮)
 * @param  which: LED编号(参考 lednum_t)
 */
void toggle_led(int which)
{
    if( which >= LedMax )
        return ;

    HAL_GPIO_TogglePin(leds[which].group, leds[which].pin);
}

/**
 * @brief  阻塞式闪烁指定LED一次(亮interval毫秒，灭interval毫秒)
 * @param  which:    LED编号(参考 lednum_t)
 * @param  interval: 亮灭各自持续时间(ms)
 */
void blink_led(int which, uint32_t interval)
{
    turn_led(which, ON);
    mdelay(interval);

    turn_led(which, OFF);
    mdelay(interval);
}

/**
 * @brief  绿灯"滴-答"双闪心跳灯：每隔 interval 秒心跳一次。
 * @param  interval: 心跳总周期，单位：秒 (参数 > 1)。
 */
void heartbeat_led(uint32_t interval)
{
    /* 总周期 - (亮 + 灭 + 亮) = 停顿时长 */
    uint32_t pause_time = (interval * 1000) - 300;
    uint32_t hb_duration[4] = {60, 60, 180, pause_time};

    static const uint8_t  hb_status[4]   = {ON,  OFF, ON,  OFF};

    static uint8_t  state = 0;
    static uint32_t last_tick = 0;
    static uint8_t  first_run = 1;

    uint32_t now = HAL_GetTick();

    if (first_run)
    {
        turn_led(Led_G, hb_status[state]);
        last_tick = now;
        first_run = 0;
    }

    if (now - last_tick >= hb_duration[state])
    {
        state = (state + 1) % 4;
        turn_led(Led_G, hb_status[state]);
        last_tick = now;
    }
}

/*
 *+----------------------+
 *|     GPIO Key API     |
 *+----------------------+
 */
 /* 全局按键状态位图定义，初始为0(所有按键都未按下) */
int  g_keys_status = 0;

/**
 * @brief  GPIO外部中断统一回调函数(HAL库弱函数重写)，
 *         按键触发的EXTI中断都会进入这里，根据引脚号区分是哪个按键按下
 * @param  GPIO_Pin: 触发中断的引脚号(如 GPIO_PIN_12/13/14)
 */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
    if( GPIO_PIN_12 == GPIO_Pin ) /* Key1 */
    {
        g_keys_status |= KEY1_PRESSED;
    }
    else if( GPIO_PIN_13 == GPIO_Pin ) /* Key2 */
    {
        g_keys_status |= KEY2_PRESSED;
    }
    else if( GPIO_PIN_14 == GPIO_Pin ) /* Key3 */
    {
        g_keys_status |= KEY3_PRESSED;
    }
}

/*
 *+----------------------+
 *|      printf API      |
 *+----------------------+
 */

/* gcc 编译器的 printf 将会调用 __io_putchar() 函数，实现最终的字符打印
 * keil编译器的 printf 将会调用 fputc() 函数，实现最终的字符打印
 * 这里我们定义一个宏 PUTCHAR_PROTOTYPE 来兼容两个编译器所需要的函数原型
 *
 * 注意：
 *  1. Keil5 工程需要勾选：Options for Target -> Target -> Use MicroLIB
 *  2. Keil5 的编译器 armclang(AC6) 会定义 __GNUC__ 宏，而旧版 armcc(AC5) 则不会
 */
#if defined(__ARMCC_VERSION) /*  */
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#elif defined(__GNUC__) /* GCC */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#endif

PUTCHAR_PROTOTYPE
{
    /* 调用STM32 HAL库的串口发送函数，将printf要打印的这个字符通过串口发送出去 */
    HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);
    return ch;
}

/*
 *+----------------------------+
 *| ADC noisy & lux sensor API |
 *+----------------------------+
 */

#include "adc.h"

/**
 * @brief  读取指定通道的ADC值
 * @param  channel: 通道号，例如 ADC_CHANNEL_15 / ADC_CHANNEL_16
 * @param  value:   读取结果输出指针
 * @retval 0 成功, -1 失败
 */
int adc_read_channel(uint32_t channel, uint32_t *value)
{
    ADC_ChannelConfTypeDef sConfig = {0};
    uint32_t timeout = 0xffffff;

    /* 咪头（麦克风）输出的是交流信号，叠加在某个直流偏置上。 当声音信号处于波形过零点附近时，
     * 2.5 个采样周期极短，ADC 输入阻抗在如此短的时间内无法对麦克风输出的高阻信号完成充电，
     * 信号还没稳定就完成了采样，所以这里修改采样时间为 247.5 Cycles。 */
    sConfig.Channel      = channel;
    sConfig.Rank         = ADC_REGULAR_RANK_1;
    sConfig.SamplingTime = ADC_SAMPLETIME_247CYCLES_5;
    sConfig.SingleDiff   = ADC_SINGLE_ENDED;
    sConfig.OffsetNumber = ADC_OFFSET_NONE;
    sConfig.Offset       = 0;

    if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
    {
        return -1;
    }

    HAL_ADC_Start(&hadc1);

    if (HAL_ADC_PollForConversion(&hadc1, timeout) != HAL_OK)
    {
        HAL_ADC_Stop(&hadc1);
        return -1;
    }

    *value = HAL_ADC_GetValue(&hadc1);
    HAL_ADC_Stop(&hadc1);

    return 0;
}

/**
 * @brief  在指定时间窗口内对麦克风多次采样，返回峰峰值作为响度
 * @param  noisy:        响度输出（峰峰值，范围 0~4095）
 * @param  window_ms:    采样时间窗口，建议 50~100ms（覆盖完整音节）
 * @retval 0表示成功，-1 表示失败
 */
int adc_read_noisy_peak(uint32_t *noisy, uint32_t window_ms)
{
    uint32_t val;
    uint32_t max_val = 0;
    uint32_t min_val = 0xFFFFFFFF;
    uint32_t deadline = HAL_GetTick() + window_ms;

    while (HAL_GetTick() < deadline)
    {
        if (adc_read_channel(ADC_CHANNEL_16, &val) != 0)
            return -1;

        if (val > max_val) max_val = val;
        if (val < min_val) min_val = val;
    }

    /* 峰峰值消除直流偏置影响，更真实反映响度 */
    *noisy = (max_val > min_val) ? (max_val - min_val) : 0;
    return 0;
}

/* ------------------- Lux 滤波相关参数 ------------------- */
#define LUX_SAMPLE_COUNT   10   /* 每次采集的原始样本数 */
#define LUX_TRIM_COUNT      2   /* 排序后，头尾各丢弃的样本数 */

/**
 * @brief  简单冒泡排序（数据量很小，不追求性能）
 */
static void sort_u32(uint32_t *arr, int n)
{
    for (int i = 0; i < n - 1; i++)
    {
        for (int j = 0; j < n - 1 - i; j++)
        {
            if (arr[j] > arr[j + 1])
            {
                uint32_t tmp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = tmp;
            }
        }
    }
}

/**
 * @brief  多次采样光照度ADC值，排序后去掉两端的离群样本，再取平均
 * @param  lux: 输出参数，滤波后的光照度值
 * @retval 0 成功, -1 失败
 */
static int adc_read_lux_filtered(uint32_t *lux)
{
    uint32_t samples[LUX_SAMPLE_COUNT];
    uint32_t sum = 0;
    int valid_count;

    /* 多次采样光照度ADC值 */
    for (int i = 0; i < LUX_SAMPLE_COUNT; i++)
    {
        if (adc_read_channel(ADC_CHANNEL_15, &samples[i]) != 0)
            return -1;
    }

    /* 将多次采样的数据排序 */
    sort_u32(samples, LUX_SAMPLE_COUNT);

    /* 丢弃排序后头尾各 LUX_TRIM_COUNT 个可能的离群值 */
    valid_count = LUX_SAMPLE_COUNT - 2 * LUX_TRIM_COUNT;
    if (valid_count <= 0)
    {
        /* 参数配置不合理时兜底，避免除0 */
        valid_count = LUX_SAMPLE_COUNT;
        for (int i = 0; i < LUX_SAMPLE_COUNT; i++)
            sum += samples[i];
    }
    else
    {
        for (int i = LUX_TRIM_COUNT; i < LUX_SAMPLE_COUNT - LUX_TRIM_COUNT; i++)
            sum += samples[i];
    }

    *lux = sum / valid_count;

    return 0;
}

 /**
 * @brief  采集光照度与噪声值
 * @param  lux:   输出参数，采集到的光照度值
 * @param  noisy: 输出参数，采集到的噪声值
 * @return 0表示成功，-1 表示失败
 */
int adc_sample_lux_noisy(uint32_t *lux, uint32_t *noisy)
{
    if (adc_read_lux_filtered(lux) != 0)
        return -1;

    if (adc_read_noisy_peak(noisy, 50) != 0)
        return -2;

    return 0;
}

/*
 *+----------------------------+
 *|      Timer delay API       |
 *+----------------------------+
 */
#include "tim.h"

/**
 * @brief  微秒级延时，最大支持 60000us，更长延时可以使用 HAL_Delay()
 * @param  us: 延时时长(微秒)
 */
void udelay(uint16_t us)
{
    uint16_t differ = 60000-us;

    HAL_TIM_Base_Start(&htim6);

    __HAL_TIM_SET_COUNTER(&htim6, differ);

    while( differ < 60000 )
    {
        differ=__HAL_TIM_GET_COUNTER(&htim6);
    }

    HAL_TIM_Base_Stop(&htim6);
}

 ex2.i2c-bitbang/Board/miscdev.h

New file
@@ -0,0 +1,170 @@
/**********************************************************************
*   Copyright: (C)2024 LingYun IoT System Studio
*      Author: GuoWenxue<guowenxue@gmail.com>
* Description: ISKBoard Hardware Abstract Layer driver
*
*   ChangeLog:
*        Version    Date       Author            Description
*        V1.0.0  2024.08.29    GuoWenxue      Release initial version
***********************************************************************/

#ifndef __MISCDEV_H
#define __MISCDEV_H

#include <stdio.h>

#include "stm32l4xx_hal.h"
#include "usart.h"
#include "buzzer.h"

/* 定义ON/OFF两个宏，这样在代码中使用比 1/0 更具有可读性 */
#define OFF    0
#define ON     1

/*
 *+----------------------+
 *|    STM32 GPIO API    |
 *+----------------------+
 */


/* 定义一个gpio的结构体，用来描述这个引脚的相关信息 */
typedef struct gpio_s
{
    const char         *name;
    GPIO_TypeDef       *group;
    uint16_t            pin;
    int                 active; /* 1 for active high, 0 for active low */
} gpio_t;

extern void gpio_clk_enable(GPIO_TypeDef *port);

/*
 *+----------------------+
 *|    GPIO Relay API    |
 *+----------------------+
 */

/**
 * @brief  继电器初始化：配置继电器控制引脚对应的GPIO
 */
extern void init_relay(void);

/**
 * @brief  控制继电器的开关状态
 * @param  status: ON 或 OFF
 */
extern void turn_relay(int status);

/*
 *+----------------------+
 *|     GPIO Led API     |
 *+----------------------+
 */

/* 定义了一个枚举，分别表示RGB三个灯的索引：
 * 枚举的第1个成员,如果没赋值则其值为0，后面的成员值永远是前面成员的值加1.
 */
typedef enum
{
    Led_R, /* 其值为0 */
    Led_G, /* 其值为1 */
    Led_B, /* 其值为2 */
    LedMax,/* 其值为3，刚好是Led的总数 */
} lednum_t;

/**
 * @brief  LED初始化：配置各LED对应的GPIO状态。
 */
extern void init_led(void);

/**
 * @brief  控制指定LED的开关状态
 * @param  which:  LED编号(参考 lednum_t，如 Led_R/Led_G/Led_B)
 * @param  status: ON 或 OFF
 */
extern void turn_led(int which, int status);

/**
 * @brief  翻转指定LED当前状态(亮变灭，灭变亮)
 * @param  which: LED编号(参考 lednum_t)
 */
extern void toggle_led(int which);

/**
 * @brief  阻塞式闪烁指定LED一次(亮interval毫秒，灭interval毫秒)
 * @param  which:    LED编号(参考 lednum_t)
 * @param  interval: 亮灭各自持续时间(ms)
 */
extern void blink_led(int which, uint32_t interval);

/**
 * @brief  绿灯"滴-答"双闪心跳灯：每隔 interval 秒心跳一次。
 * @param  interval: 心跳总周期，单位：秒 (参数 > 1)。
 */
extern void heartbeat_led(uint32_t interval);

/*
 *+----------------------+
 *|     GPIO Led API     |
 *+----------------------+
 */

/* 定义了一个枚举，分别表示RGB三个灯的索引：
 * 枚举的第1个成员,如果没赋值则其值为0，后面的成员值永远是前面成员的值加1.
 */
typedef enum
{
    Key1, /* 其值为0 */
    Key2, /* 其值为1 */
    Key3, /* 其值为2 */
    KeyMax,/* 其值为3，刚好是Key的总数 */
} keynum_t;

/* 按键状态位掩码：对应 g_keys_status 中的第 Key1/Key2/Key3 位被按下 */
#define KEY1_PRESSED    (1<<Key1)
#define KEY2_PRESSED    (1<<Key2)
#define KEY3_PRESSED    (1<<Key3)

/* 全局按键状态位图，每一位代表当前按键是否处于"已按下"状态，由中断逻辑置位 */
extern int  g_keys_status;

/* 判断指定按键当前是否处于按下状态 */
#define key_pressed(key)  (g_keys_status & (1<<key) )

/* 清除指定按键的按下标志 */
#define key_clear(key)    (g_keys_status &= ~(1<<key) )

/*
 *+----------------------------+
 *| ADC noisy & lux sensor API |
 *+----------------------------+
 */

 /**
 * @brief  采集光照度与噪声值
 * @param  lux:   输出参数，采集到的光照度值
 * @param  noisy: 输出参数，采集到的噪声值
 * @return 0表示成功，-1 表示失败
 */
extern int adc_sample_lux_noisy(uint32_t *lux, uint32_t *noisy);

/*
 *+----------------------------+
 *|      Timer delay API       |
 *+----------------------------+
 */

/**
 * @brief  微秒级延时，最大支持 60000us，更长延时可以使用 HAL_Delay()
 * @param  us: 延时时长(微秒)
 */
extern void udelay(uint16_t us);

/**
 * @brief  毫秒秒级延时，直接使用 HAL_Delay()，方便代码可读性
 * @param  ms: 延时时长(毫秒)
 */
#define mdelay(ms)  HAL_Delay(ms)

#endif /* __MISCDEV_H */

 ex2.i2c-bitbang/Board/oled_drv.c

New file
@@ -0,0 +1,402 @@
/**********************************************************************
 *   Copyright: (C)2021 LingYun IoT System Studio <www.weike-iot.com>
 *      Author: GuoWenxue<guowenxue@gmail.com> QQ: 281143292
 * Description: ISKBoard OLED(N091-2832TSWFG02-H14, 128x32) SSD1306 driver
 *
 *   ChangeLog:
 *        Version    Date       Author            Description
 *        V1.0.0  2021.08.10  GuoWenxue      Release initial version
 *        V2.0.0  2026.04.29  Optimized      GRAM buffered rendering
 ***********************************************************************/

#include <string.h>
#include "oled_drv.h"
#include "oled_font.h"
#include "miscdev.h"

/* I2C 设备 OLED */
static     i2c_dev_t oled;

/* -----------------------------------------------------------------------
 * 屏幕本地显存镜像缓冲区（Shadow GRAM）:  128列 x 4页
 * 所有绘制操作先写入此缓冲区，调用 OLED_Refresh() 后才真正发送到屏幕，
 * ----------------------------------------------------------------------- */
static uint8_t s_gram[OLED_PAGES][X_WIDTH];

/* -----------------------------------------------------------------------
 * I2C 突发传输数据打包缓冲区，大小为 128列 + 1字节控制头 = 129 字节。
 * 用于在冲刷（Refresh）每一页显存时，将控制字节 (OLED_DATA) 与一页的
 * 128 字节 GRAM 数据在连续的内存中拼接，从而实现单次 I2C 事务的流式高效写入。
 * ----------------------------------------------------------------------- */
static uint8_t s_tx_packet[X_WIDTH + 1];

/*
 * ====================================
 *     1. OLED 底层内部私有通信函数
 * ====================================
 */

static int oled_write_cmd(uint8_t cmd)
{
    i2c_msg_t msg;
    int ret = -2;
    uint8_t buf[2];

    /* 准备数据包：控制字节(OLED_CMD) + 命令字节 */
    buf[0] = OLED_CMD;
    buf[1] = cmd;

    /* 配置 I2C 消息结构体 */
    msg.addr = oled.dev_addr;   /* 7位从机地址 */
    msg.flags = I2C_M_WR;       /* 写标志 */
    msg.len = 2;                /* 数据长度 = 控制字节 + 命令字节 */
    msg.buf = buf;              /* 数据指针 */

    /* 将I2C总线加锁让设备独占总线 */
    i2c_lock_dev(&oled);

    /* 执行 I2C 传输 */
    if (i2c_transfer(oled.bus, &msg, 1) != I2C_OK)
    {
        goto cleanup;
    }

    ret = 0;

cleanup:
    /* 释放设备的 I2C 总线锁 */
    i2c_free_dev(&oled);
    return ret;
}

int OLED_Init(i2c_bus_t *bus)
{
    if (!bus)
        return -1;

    if( i2c_bind_dev(&oled, bus, OLED_I2C_ADDR) < 0)
        return -2;

    mdelay(100);

    oled_write_cmd(0xAE); /* Display OFF */
    oled_write_cmd(0x40); /* Display Start Line = 0 */
    oled_write_cmd(0xB0); /* Page Start Address = 0 */
    oled_write_cmd(0xC8); /* COM Scan: remapped (垂直翻转修正) */

    oled_write_cmd(0x81); /* Contrast Control */
    oled_write_cmd(0xFF); /* 最大对比度 */
    oled_write_cmd(0xA1); /* Segment Remap: SEG127→SEG0 */
    oled_write_cmd(0xA6); /* Normal Display (非反色) */

    oled_write_cmd(0xA8); /* Multiplex Ratio */
    oled_write_cmd(0x1F); /* MUX=31 → 32行 (128×32屏) */
    oled_write_cmd(0xD3); /* Display Offset */
    oled_write_cmd(0x00); /* 垂直偏移=0 */

    oled_write_cmd(0xD5); /* Display Clock Divide Ratio / OSC */
    oled_write_cmd(0xF0); /* 高频率 + 默认分频，提高刷新率 */
    oled_write_cmd(0xD9); /* Pre-charge Period */
    oled_write_cmd(0x22); /* Phase1=2, Phase2=2 DCLK */

    oled_write_cmd(0xDA); /* COM Pins Hardware Config */
    oled_write_cmd(0x02); /* 适用于 128×32(128×64 用 0x12) */

    oled_write_cmd(0xDB); /* VCOMH */
    oled_write_cmd(0x49); /* ≈ 0.83×Vcc */

    /* 开启 OLED 显示面板 */
    OLED_Display_On();

    /* 将显示屏黑屏 */
    OLED_Clear();
    OLED_Refresh();

    return 0;
}

/**
 * @brief 开启 OLED 显示面板
 */
void OLED_Display_On(void)
{
    oled_write_cmd(0x8D); /* Charge Pump Setting */
    oled_write_cmd(0x14); /* 电荷泵使能 */
    oled_write_cmd(0xAF); /* Display ON */
}

/**
 * @brief 关闭 OLED 显示面板
 */
void OLED_Display_Off(void)
{
    oled_write_cmd(0x8D); /* Charge Pump Setting */
    oled_write_cmd(0x10); /* 电荷泵停用 */
    oled_write_cmd(0xAE); /* Display OFF */
}

/* 设置页地址（Page Address）, SSD1306 显示屏按页寻址，每页 8 行像素
 * page 表示页号（0~3，对应 32px 高度的 4 页）
 */
void oled_set_pos(uint8_t x, uint8_t page)
{
    oled_write_cmd( 0xB0 | (page & 0x07) );      /* 页地址 */
    oled_write_cmd( 0x10 | ((x & 0xF0) >> 4) );  /* 列高4位 */
    oled_write_cmd( x & 0x0F );                  /* 列低4位 */
}

/**
 * @brief 将本地 GRAM 缓冲区突发（Burst）全量更新至屏幕物理显存
 */
void OLED_Refresh(void)
{
    uint8_t page;
    i2c_msg_t msg;

    /* 锁住整个整幅图像的刷新周期，避免多页之间总线控制权被切走造成画面闪烁 */
    i2c_lock_dev(&oled);

    msg.addr  = oled.dev_addr;
    msg.flags = I2C_M_WR;
    msg.len   = X_WIDTH + 1;
    msg.buf   = s_tx_packet;
    s_tx_packet[0] = (uint8_t)OLED_DATA;

    for (page = 0; page < OLED_PAGES; page++)
    {
        oled_set_pos(0, page);

        memcpy(&s_tx_packet[1], s_gram[page], X_WIDTH);

        if (i2c_transfer(oled.bus, &msg, 1) != I2C_OK)
        {
            goto cleanup;
        }
        udelay(5);
    }

cleanup:
    i2c_free_dev(&oled);
}

/*
 * ====================================
 * 2. 内存渲染 API (无需涉及I2C总线操作)
 * ====================================
 */

/**
 * @brief 清空软件 GRAM 缓冲区(全黑), 需配合 OLED_Refresh() 使用。
 */
void OLED_Clear(void)
{
    memset(s_gram, 0x00, sizeof(s_gram));
}

/**
 * @brief 点亮软件 GRAM 缓冲区中所有像素(全白), 需配合 OLED_Refresh() 使用。
 */
void OLED_On(void)
{
    memset(s_gram, 0xFF, sizeof(s_gram));
}

/**
 * @brief 在本地显存区绘制一个 ASCII 字符
 */
void OLED_ShowChar(uint8_t x, uint8_t page, char chr, uint8_t char_size)
{
    uint8_t c;
    uint8_t i;
    uint8_t col;

    if (chr < ' ' || chr > '~')
    {
        chr = '?';
    }
    c = chr - ' ';

    if (char_size == OLED_FONT16)
    {
        for (i = 0; i < 8; i++)
        {
            col = x + i;
            if (col >= X_WIDTH)
            {
                break;
            }
            if (page < OLED_PAGES)
            {
                s_gram[page][col] = F8X16[c * 16 + i];
            }
            if ((page + 1) < OLED_PAGES)
            {
                s_gram[page + 1][col] = F8X16[c * 16 + i + 8];
            }
        }
    }
    else
    {
        for (i = 0; i < 6; i++)
        {
            col = x + i;
            if (col >= X_WIDTH)
            {
                break;
            }
            if (page < OLED_PAGES)
            {
                s_gram[page][col] = F6x8[c][i];
            }
        }
    }
}

/**
 * @brief 在本地显存区绘制字符串
 */
void OLED_ShowString(uint8_t x, uint8_t page, const char *str, uint8_t font_size)
{
    uint8_t char_width;
    uint8_t char_pages;

    char_width = (font_size == OLED_FONT16) ? 8 : 6;
    char_pages = (font_size == OLED_FONT16) ? 2 : 1;

    if (!str)
    {
        return;
    }

    while (*str != '\0')
    {
        if (page + char_pages > OLED_PAGES)
        {
            break;
        }

        OLED_ShowChar(x, page, *str, font_size);
        x += char_width;
        if (x + char_width > X_WIDTH)
        {
            x = 0;
            page += char_pages;
        }
        str++;
    }
}

/**
 * @brief 在本地显存区绘制 16x16 汉字
 */
void OLED_ShowChinese(const uint8_t (*Hzk)[32], uint8_t x, uint8_t page, uint8_t index)
{
    uint8_t i;
    uint8_t col;

    if (!Hzk || (page + 1 >= OLED_PAGES))
    {
        return;
    }

    for (i = 0; i < 16; i++)
    {
        col = x + i;
        if (col >= X_WIDTH)
        {
            break;
        }
        s_gram[page][col]     = Hzk[2 * index][i];
        s_gram[page + 1][col] = Hzk[2 * index + 1][i];
    }
}

/**
 * @brief 在本地显存区绘制单色 BMP 位图
 */
void OLED_DrawBMP(uint8_t x0, uint8_t page0, uint8_t x_width, uint8_t y_width, const uint8_t *bmp)
{
    uint8_t  page;
    uint8_t  x;
    uint8_t  pages;
    uint32_t j;

    pages = (y_width + 7) / 8;
    j = 0;

    if (!bmp)
    {
        return;
    }

    for (page = page0; page < page0 + pages && page < OLED_PAGES; page++)
    {
        for (x = x0; x < x0 + x_width && x < X_WIDTH; x++)
        {
            s_gram[page][x] = bmp[j++];
        }
    }
}

/*
 * ====================================
 * 3. OLED 驱动测试及示范代码
 * ====================================
 */

void oled_test_example(void)
{
    uint8_t i;
    const char *title = "ISKBoard";

    /* 1. 硬件总线与外设初始化 */
    OLED_Init(&i2c1_bus);
    mdelay(500);

    /* 2. 第一阶段：全屏点阵 Logo 图像显示测试 */
    OLED_Clear();
    /* 参数说明: 起始X=0, 起始页=PAGE0, 宽度=128, 高度=32, 数据源 */
    OLED_DrawBMP(0, OLED_PAGE0, BMP_LOGO_WIDTH, BMP_LOGO_HEIGHT, bmp_logo);
    OLED_Refresh(); /* 冲刷到物理屏幕 */
    mdelay(3000);   /* 保持显示 3 秒 */


/* 3. 第二阶段：16x16 宋体汉字 "凌云实验室" 显示测试 */
    OLED_Clear();
    /* * 基于 index 寻址：
     * 传入 index=0，函数内部会自动抓取 Hzk_LingYun[0] 和 Hzk_LingYun[1] 组合成“凌”
     * 传入 index=1，函数内部会自动抓取 Hzk_LingYun[2] 和 Hzk_LingYun[3] 组合成“云”
     * 每个字横向占 16 像素，起始 X 从 24 开始，使 5 个字在 128 像素宽的屏幕上完美居中
     */
    OLED_ShowChinese(Hzk_LingYun, 24,  OLED_PAGE1, 0); /* “凌” (index: 0) */
    OLED_ShowChinese(Hzk_LingYun, 40,  OLED_PAGE1, 1); /* “云” (index: 1) */
    OLED_ShowChinese(Hzk_LingYun, 56,  OLED_PAGE1, 2); /* “实” (index: 2) */
    OLED_ShowChinese(Hzk_LingYun, 72,  OLED_PAGE1, 3); /* “验” (index: 3) */
    OLED_ShowChinese(Hzk_LingYun, 88,  OLED_PAGE1, 4); /* “室” (index: 4) */
    OLED_Refresh(); /* 将渲染好的 5 个宋体汉字一次性刷入屏幕 */
    mdelay(2500);   /* 保持显示 2.5 秒 */

    /* 4. 第三阶段：标准 ASCII 字符串动效打字机显示测试 */
    OLED_Clear();
    OLED_Refresh();

    /* 动态计算位置，从第 32 列、第 1 页开始以 16 号大字体逐字敲出 "ISKBoard" */
    for (i = 0; title[i] != '\0'; i++)
    {
        OLED_ShowChar(32 + (i * 8), OLED_PAGE1, title[i], OLED_FONT16);
        OLED_Refresh(); /* 每写一个字符，立即同步刷新到屏幕，形成打字机动效 */
        mdelay(150);
    }
    mdelay(2000);

    /* 5. 第四阶段：测试结束，清屏复位 */
    OLED_Clear();
    OLED_ShowString(24, OLED_PAGE1, "- Test Over -", OLED_FONT16);
    OLED_Refresh();
    mdelay(1000);

    /* 6. 将显示屏黑屏并关闭显示 */
    OLED_Clear();
    OLED_Refresh();
    OLED_Display_Off();
}

 ex2.i2c-bitbang/Board/oled_drv.h

New file
@@ -0,0 +1,163 @@
/**********************************************************************
 * Copyright: (C)2021 LingYun IoT System Studio <www.weike-iot.com>
 * Author: GuoWenxue<guowenxue@gmail.com> QQ: 281143292
 * Description: ISKBoard OLED(N091-2832TSWFG02-H14, 128x32) SSD1306 driver
 *
 * ChangeLog:
 * Version    Date        Author             Description
 * V1.0.0  2021.08.10  GuoWenxue       Release initial version
 * V2.0.0  2026.04.29  Optimized       GRAM buffered rendering
 ***********************************************************************/

/* SSD1306 OLED显示器内部按页(Page)组织数据：

     屏幕布局（128x32）:
     +------------------+
     | Page 0 (0~7)     | ← 8像素
     +------------------+
     | Page 1 (8~15)    | ← 8像素
     +------------------+
     | Page 2 (16~23)   | ← 8像素
     +------------------+
     | Page 3 (24~31)   | ← 8像素
     +------------------+

     字体大小说明：
     +---------------+---------+-------+----------+-------------+
     |    FONT       |  宽度   |  高度 |  占用页数 |   Y坐标类型 |
     +---------------+---------+-------+----------+-------------+
     | FONT8(6x8)    |  6像素  | 8像素 |   1页    |  页码(0~3)  |
     +---------------+---------+-------+----------+-------------+
     | FONT16(8x16)  |  8像素  | 16像素|   2页    |  页码(0~2)  |
     +---------------+---------+-------+----------+-------------+
     | Chinese(16x16)|  16像素 | 16像素|   2页    |  页码(0~2)  |
     +---------------+---------+-------+----------+-------------+
 */

#ifndef __OLED_DRV_H
#define __OLED_DRV_H

#include "stm32l4xx_hal.h"
#include "i2c_bitbang.h"

/* OLED I2C 从设备地址 */
#define OLED_I2C_ADDR   0x3C

/* 屏幕物理尺寸 */
#define X_WIDTH         128
#define Y_WIDTH         32

/* 字体大小选项 */
#define OLED_FONT16     16  /* 8×16 像素字体 */
#define OLED_FONT8      8   /* 6×8  像素字体 */

/* SSD1306 页数（128×32 屏共 4 页，每页 8 行像素） */
enum
{
    OLED_PAGE0, /* 第0个页，控制纵坐标从 0 开始 */
    OLED_PAGE1, /* 第1个页，控制纵坐标从 8 开始 */
    OLED_PAGE2, /* 第2个页，控制纵坐标从 16 开始 */
    OLED_PAGE3, /* 第3个页，控制纵坐标从 24 开始 */
    OLED_PAGES, /* 总共 4 个页 */
};

/* 根据 SSD1306 芯片 datasheet 说明定义控制流标记 */
typedef enum
{
    OLED_CMD  = 0x00,   /* Co=0, D/C#=0 -> 后面跟着命令 */
    OLED_DATA = 0x40,   /* Co=0, D/C#=1 -> 后面跟着全数据流 */
} oled_ctrl_t;

/*
 * =========================================================================
 * 显示控制 API
 * =========================================================================
 */

/**
 * @brief 初始化 OLED 显示屏（包含寄存器流配置、本地 GRAM 格式化、以及首次总线强刷）
 * @param bus: 绑定的 i2c-bitbang 物理总线句柄
 */
int OLED_Init(i2c_bus_t *bus);

/**
 * @brief 清空软件 GRAM 缓冲区(全黑), 需配合 OLED_Refresh() 使用。
 */
void OLED_Clear(void);

/**
 * @brief 点亮软件 GRAM 缓冲区中所有像素(全白), 需配合 OLED_Refresh() 使用。
 */
void OLED_On(void);

/**
 * @brief 开启 OLED 显示（打开内建 Charge Pump 倍压器 + 开启显示面板）
 */
void OLED_Display_On(void);

/**
 * @brief 关闭 OLED 显示（进入超低功耗硬件待机模式，显存内容保持不动）
 */
void OLED_Display_Off(void);

/**
 * @brief 将软件 GRAM 缓冲区一次性突发刷新到 OLED 硬件显存中
 * 每页采用单次加锁机制，极大幅度压缩总线事务开销，给其他设备留足带宽。
 */
void OLED_Refresh(void);

/*
 * =========================================================================
 * 绘制 API（写缓冲区，需配合 OLED_Refresh() 显示）
 * =========================================================================
 */

/**
 * @brief 在本地 GRAM 缓冲区中写入单个可打印 ASCII 字符
 *
 * @param x         列坐标 (0 ~ X_WIDTH-1)
 * @param page      页坐标 (0 ~ OLED_PAGES-1)
 * @param chr       ASCII 可打印字符
 * @param char_size OLED_FONT16 (占 2 页) 或 OLED_FONT8 (占 1 页)
 */
void OLED_ShowChar(uint8_t x, uint8_t page, char chr, uint8_t char_size);

/**
 * @brief 在本地 GRAM 缓冲区中写入 ASCII 字符串（到行尾自动换行）
 *
 * @param x         起始列 (0 ~ X_WIDTH-1)
 * @param page      起始页 (0 ~ OLED_PAGES-1)
 * @param str       以 '\0' 结尾的字符串指针（支持 const 静态字面量）
 * @param font_size OLED_FONT16 或 OLED_FONT8
 */
void OLED_ShowString(uint8_t x, uint8_t page, const char *str, uint8_t font_size);

/**
 * @brief 在本地 GRAM 缓冲区中写入一个 16×16 的标准汉字
 *
 * @param Hzk       汉字字模二维数组只读指针（每个汉字 32 字节，分立上下两页）
 * @param x         起始列 (0 ~ X_WIDTH-1)
 * @param page      起始页 (0 ~ OLED_PAGES-1)
 * @param index     目标汉字在点阵数组中的索引序号
 */
void OLED_ShowChinese(const uint8_t (*Hzk)[32], uint8_t x, uint8_t page, uint8_t index);

/**
 * @brief 在本地 GRAM 缓冲区中绘制单色二进制 BMP 图像
 *
 * @param x0        起始列 (0 ~ X_WIDTH-1)
 * @param page0     起始页 (0 ~ OLED_PAGES-1)
 * @param x_width   图像像素宽度
 * @param y_width   图像像素高度（工程规范：必须为 8 的整数倍）
 * @param bmp       单色点阵数组指针（列行式，逆向取模）
 */
void OLED_DrawBMP(uint8_t x0, uint8_t page0,
                  uint8_t x_width, uint8_t y_width,
                  const uint8_t *bmp);

/**
 * @brief OLED 驱动功能及综合演示函数（包含动态打字机、混排、全图爆破等）
 */
void oled_test_example(void);

#endif /* __OLED_DRV_H */

 ex2.i2c-bitbang/Board/oled_font.c

New file
@@ -0,0 +1,323 @@
/**********************************************************************
*   Copyright: (C)2021 LingYun IoT System Studio <www.weike-iot.com>
*      Author: GuoWenxue<guowenxue@gmail.com> QQ: 281143292
* Description: ISKBoard OLED font data (PCtoLCD.exe generated)
*
*   ChangeLog:
*        Version    Date       Author            Description
*        V1.0.0  2021.08.10  GuoWenxue      Release initial version
***********************************************************************/

#include "oled_font.h"

/*+--------------------------------+
 *|      ASCII font size 6x8       |
 *+--------------------------------+*/

/* 可打印 ASCII 范围: ' '(0x20) ~ '~'(0x7E), 共 95 个字符 */
const uint8_t F6x8[][6] =
{
    {0x00,0x00,0x00,0x00,0x00,0x00},/* sp  */
    {0x00,0x00,0x00,0x2F,0x00,0x00},/* !   */
    {0x00,0x00,0x07,0x00,0x07,0x00},/* "   */
    {0x00,0x14,0x7F,0x14,0x7F,0x14},/* #   */
    {0x00,0x24,0x2A,0x7F,0x2A,0x12},/* $   */
    {0x00,0x62,0x64,0x08,0x13,0x23},/* %   */
    {0x00,0x36,0x49,0x55,0x22,0x50},/* &   */
    {0x00,0x00,0x05,0x03,0x00,0x00},/* '   */
    {0x00,0x00,0x1C,0x22,0x41,0x00},/* (   */
    {0x00,0x00,0x41,0x22,0x1C,0x00},/* )   */
    {0x00,0x14,0x08,0x3E,0x08,0x14},/* * */
    {0x00,0x08,0x08,0x3E,0x08,0x08},/* +   */
    {0x00,0x00,0x00,0xA0,0x60,0x00},/* ,   */
    {0x00,0x08,0x08,0x08,0x08,0x08},/* -   */
    {0x00,0x00,0x60,0x60,0x00,0x00},/* .   */
    {0x00,0x20,0x10,0x08,0x04,0x02},/* /   */
    {0x00,0x3E,0x51,0x49,0x45,0x3E},/* 0   */
    {0x00,0x00,0x42,0x7F,0x40,0x00},/* 1   */
    {0x00,0x42,0x61,0x51,0x49,0x46},/* 2   */
    {0x00,0x21,0x41,0x45,0x4B,0x31},/* 3   */
    {0x00,0x18,0x14,0x12,0x7F,0x10},/* 4   */
    {0x00,0x27,0x45,0x45,0x45,0x39},/* 5   */
    {0x00,0x3C,0x4A,0x49,0x49,0x30},/* 6   */
    {0x00,0x01,0x71,0x09,0x05,0x03},/* 7   */
    {0x00,0x36,0x49,0x49,0x49,0x36},/* 8   */
    {0x00,0x06,0x49,0x49,0x29,0x1E},/* 9   */
    {0x00,0x00,0x36,0x36,0x00,0x00},/* :   */
    {0x00,0x00,0x56,0x36,0x00,0x00},/* ;   */
    {0x00,0x08,0x14,0x22,0x41,0x00},/* <   */
    {0x00,0x14,0x14,0x14,0x14,0x14},/* =   */
    {0x00,0x00,0x41,0x22,0x14,0x08},/* >   */
    {0x00,0x02,0x01,0x51,0x09,0x06},/* ?   */
    {0x00,0x32,0x49,0x59,0x51,0x3E},/* @   */
    {0x00,0x7C,0x12,0x11,0x12,0x7C},/* A   */
    {0x00,0x7F,0x49,0x49,0x49,0x36},/* B   */
    {0x00,0x3E,0x41,0x41,0x41,0x22},/* C   */
    {0x00,0x7F,0x41,0x41,0x22,0x1C},/* D   */
    {0x00,0x7F,0x49,0x49,0x49,0x41},/* E   */
    {0x00,0x7F,0x09,0x09,0x09,0x01},/* F   */
    {0x00,0x3E,0x41,0x49,0x49,0x7A},/* G   */
    {0x00,0x7F,0x08,0x08,0x08,0x7F},/* H   */
    {0x00,0x00,0x41,0x7F,0x41,0x00},/* I   */
    {0x00,0x20,0x40,0x41,0x3F,0x01},/* J   */
    {0x00,0x7F,0x08,0x14,0x22,0x41},/* K   */
    {0x00,0x7F,0x40,0x40,0x40,0x40},/* L   */
    {0x00,0x7F,0x02,0x0C,0x02,0x7F},/* M   */
    {0x00,0x7F,0x04,0x08,0x10,0x7F},/* N   */
    {0x00,0x3E,0x41,0x41,0x41,0x3E},/* O   */
    {0x00,0x7F,0x09,0x09,0x09,0x06},/* P   */
    {0x00,0x3E,0x41,0x51,0x21,0x5E},/* Q   */
    {0x00,0x7F,0x09,0x19,0x29,0x46},/* R   */
    {0x00,0x46,0x49,0x49,0x49,0x31},/* S   */
    {0x00,0x01,0x01,0x7F,0x01,0x01},/* T   */
    {0x00,0x3F,0x40,0x40,0x40,0x3F},/* U   */
    {0x00,0x1F,0x20,0x40,0x20,0x1F},/* V   */
    {0x00,0x3F,0x40,0x38,0x40,0x3F},/* W   */
    {0x00,0x63,0x14,0x08,0x14,0x63},/* X   */
    {0x00,0x07,0x08,0x70,0x08,0x07},/* Y   */
    {0x00,0x61,0x51,0x49,0x45,0x43},/* Z   */
    {0x00,0x00,0x7F,0x41,0x41,0x00},/* [   */
    {0x00,0x0C,0x30,0xC0,0x00,0x00},/* \   */
    {0x00,0x00,0x41,0x41,0x7F,0x00},/* ]   */
    {0x00,0x04,0x02,0x01,0x02,0x04},/* ^   */
    {0x00,0x40,0x40,0x40,0x40,0x40},/* _   */
    {0x00,0x00,0x01,0x02,0x04,0x00},/* `   */
    {0x00,0x20,0x54,0x54,0x54,0x78},/* a   */
    {0x00,0x7F,0x48,0x44,0x44,0x38},/* b   */
    {0x00,0x38,0x44,0x44,0x44,0x20},/* c   */
    {0x00,0x38,0x44,0x44,0x48,0x7F},/* d   */
    {0x00,0x38,0x54,0x54,0x54,0x18},/* e   */
    {0x00,0x08,0x7E,0x09,0x01,0x02},/* f   */
    {0x00,0x18,0xA4,0xA4,0xA4,0x7C},/* g   */
    {0x00,0x7F,0x08,0x04,0x04,0x78},/* h   */
    {0x00,0x00,0x44,0x7D,0x40,0x00},/* i   */
    {0x00,0x40,0x80,0x84,0x7D,0x00},/* j   */
    {0x00,0x7F,0x10,0x28,0x44,0x00},/* k   */
    {0x00,0x00,0x41,0x7F,0x40,0x00},/* l   */
    {0x00,0x7C,0x04,0x18,0x04,0x78},/* m   */
    {0x00,0x7C,0x08,0x04,0x04,0x78},/* n   */
    {0x00,0x38,0x44,0x44,0x44,0x38},/* o   */
    {0x00,0xFC,0x24,0x24,0x24,0x18},/* p   */
    {0x00,0x18,0x24,0x24,0x18,0xFC},/* q   */
    {0x00,0x7C,0x08,0x04,0x04,0x08},/* r   */
    {0x00,0x48,0x54,0x54,0x54,0x20},/* s   */
    {0x00,0x04,0x3F,0x44,0x40,0x20},/* t   */
    {0x00,0x3C,0x40,0x40,0x20,0x7C},/* u   */
    {0x00,0x1C,0x20,0x40,0x20,0x1C},/* v   */
    {0x00,0x3C,0x40,0x30,0x40,0x3C},/* w   */
    {0x00,0x44,0x28,0x10,0x28,0x44},/* x   */
    {0x00,0x1C,0xA0,0xA0,0xA0,0x7C},/* y   */
    {0x00,0x44,0x64,0x54,0x4C,0x44},/* z   */
    {0x14,0x14,0x14,0x14,0x14,0x14},/* horiz lines */
};

/*+--------------------------------+
 *|      ASCII font size 8x16      |
 *+--------------------------------+*/

/* 每个字符 16 字节, 共 95 个字符 */
 const uint8_t F8X16[] =
{
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,/* sp  0 */
    0x00,0x00,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x33,0x30,0x00,0x00,0x00,/* !   1 */
    0x00,0x10,0x0C,0x06,0x10,0x0C,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,/* "   2 */
    0x40,0xC0,0x78,0x40,0xC0,0x78,0x40,0x00,0x04,0x3F,0x04,0x04,0x3F,0x04,0x04,0x00,/* #   3 */
    0x00,0x70,0x88,0xFC,0x08,0x30,0x00,0x00,0x00,0x18,0x20,0xFF,0x21,0x1E,0x00,0x00,/* $   4 */
    0xF0,0x08,0xF0,0x00,0xE0,0x18,0x00,0x00,0x00,0x21,0x1C,0x03,0x1E,0x21,0x1E,0x00,/* %   5 */
    0x00,0xF0,0x08,0x88,0x70,0x00,0x00,0x00,0x1E,0x21,0x23,0x24,0x19,0x27,0x21,0x10,/* &   6 */
    0x10,0x16,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,/* '   7 */
    0x00,0x00,0x00,0xE0,0x18,0x04,0x02,0x00,0x00,0x00,0x00,0x07,0x18,0x20,0x40,0x00,/* (   8 */
    0x00,0x02,0x04,0x18,0xE0,0x00,0x00,0x00,0x00,0x40,0x20,0x18,0x07,0x00,0x00,0x00,/* )   9 */
    0x40,0x40,0x80,0xF0,0x80,0x40,0x40,0x00,0x02,0x02,0x01,0x0F,0x01,0x02,0x02,0x00,/* * 10 */
    0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x1F,0x01,0x01,0x01,0x00,/* +  11 */
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xB0,0x70,0x00,0x00,0x00,0x00,0x00,/* ,  12 */
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01,/* -  13 */
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,0x00,0x00,/* .  14 */
    0x00,0x00,0x00,0x00,0x80,0x60,0x18,0x04,0x00,0x60,0x18,0x06,0x01,0x00,0x00,0x00,/* /  15 */
    0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00,/* 0  16 */
    0x00,0x10,0x10,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,/* 1  17 */
    0x00,0x70,0x08,0x08,0x08,0x88,0x70,0x00,0x00,0x30,0x28,0x24,0x22,0x21,0x30,0x00,/* 2  18 */
    0x00,0x30,0x08,0x88,0x88,0x48,0x30,0x00,0x00,0x18,0x20,0x20,0x20,0x11,0x0E,0x00,/* 3  19 */
    0x00,0x00,0xC0,0x20,0x10,0xF8,0x00,0x00,0x00,0x07,0x04,0x24,0x24,0x3F,0x24,0x00,/* 4  20 */
    0x00,0xF8,0x08,0x88,0x88,0x08,0x08,0x00,0x00,0x19,0x21,0x20,0x20,0x11,0x0E,0x00,/* 5  21 */
    0x00,0xE0,0x10,0x88,0x88,0x18,0x00,0x00,0x00,0x0F,0x11,0x20,0x20,0x11,0x0E,0x00,/* 6  22 */
    0x00,0x38,0x08,0x08,0xC8,0x38,0x08,0x00,0x00,0x00,0x00,0x3F,0x00,0x00,0x00,0x00,/* 7  23 */
    0x00,0x70,0x88,0x08,0x08,0x88,0x70,0x00,0x00,0x1C,0x22,0x21,0x21,0x22,0x1C,0x00,/* 8  24 */
    0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x00,0x31,0x22,0x22,0x11,0x0F,0x00,/* 9  25 */
    0x00,0x00,0x00,0xC0,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,/* :  26 */
    0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x60,0x00,0x00,0x00,0x00,/* ;  27 */
    0x00,0x00,0x80,0x40,0x20,0x10,0x08,0x00,0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x00,/* <  28 */
    0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x00,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x00,/* =  29 */
    0x00,0x08,0x10,0x20,0x40,0x80,0x00,0x00,0x00,0x20,0x10,0x08,0x04,0x02,0x01,0x00,/* >  30 */
    0x00,0x70,0x48,0x08,0x08,0x08,0xF0,0x00,0x00,0x00,0x00,0x30,0x36,0x01,0x00,0x00,/* ?  31 */
    0xC0,0x30,0xC8,0x28,0xE8,0x10,0xE0,0x00,0x07,0x18,0x27,0x24,0x23,0x14,0x0B,0x00,/* @  32 */
    0x00,0x00,0xC0,0x38,0xE0,0x00,0x00,0x00,0x20,0x3C,0x23,0x02,0x02,0x27,0x38,0x20,/* A  33 */
    0x08,0xF8,0x88,0x88,0x88,0x70,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x11,0x0E,0x00,/* B  34 */
    0xC0,0x30,0x08,0x08,0x08,0x08,0x38,0x00,0x07,0x18,0x20,0x20,0x20,0x10,0x08,0x00,/* C  35 */
    0x08,0xF8,0x08,0x08,0x08,0x10,0xE0,0x00,0x20,0x3F,0x20,0x20,0x20,0x10,0x0F,0x00,/* D  36 */
    0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x20,0x23,0x20,0x18,0x00,/* E  37 */
    0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x00,0x03,0x00,0x00,0x00,/* F  38 */
    0xC0,0x30,0x08,0x08,0x08,0x38,0x00,0x00,0x07,0x18,0x20,0x20,0x22,0x1E,0x02,0x00,/* G  39 */
    0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x20,0x3F,0x21,0x01,0x01,0x21,0x3F,0x20,/* H  40 */
    0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,/* I  41 */
    0x00,0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,0x00,/* J  42 */
    0x08,0xF8,0x88,0xC0,0x28,0x18,0x08,0x00,0x20,0x3F,0x20,0x01,0x26,0x38,0x20,0x00,/* K  43 */
    0x08,0xF8,0x08,0x00,0x00,0x00,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x20,0x30,0x00,/* L  44 */
    0x08,0xF8,0xF8,0x00,0xF8,0xF8,0x08,0x00,0x20,0x3F,0x00,0x3F,0x00,0x3F,0x20,0x00,/* M  45 */
    0x08,0xF8,0x30,0xC0,0x00,0x08,0xF8,0x08,0x20,0x3F,0x20,0x00,0x07,0x18,0x3F,0x00,/* N  46 */
    0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x10,0x20,0x20,0x20,0x10,0x0F,0x00,/* O  47 */
    0x08,0xF8,0x08,0x08,0x08,0x08,0xF0,0x00,0x20,0x3F,0x21,0x01,0x01,0x01,0x00,0x00,/* P  48 */
    0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x18,0x24,0x24,0x38,0x50,0x4F,0x00,/* Q  49 */
    0x08,0xF8,0x88,0x88,0x88,0x88,0x70,0x00,0x20,0x3F,0x20,0x00,0x03,0x0C,0x30,0x20,/* R  50 */
    0x00,0x70,0x88,0x08,0x08,0x08,0x38,0x00,0x00,0x38,0x20,0x21,0x21,0x22,0x1C,0x00,/* S  51 */
    0x18,0x08,0x08,0xF8,0x08,0x08,0x18,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,/* T  52 */
    0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,/* U  53 */
    0x08,0x78,0x88,0x00,0x00,0xC8,0x38,0x08,0x00,0x00,0x07,0x38,0x0E,0x01,0x00,0x00,/* V  54 */
    0xF8,0x08,0x00,0xF8,0x00,0x08,0xF8,0x00,0x03,0x3C,0x07,0x00,0x07,0x3C,0x03,0x00,/* W  55 */
    0x08,0x18,0x68,0x80,0x80,0x68,0x18,0x08,0x20,0x30,0x2C,0x03,0x03,0x2C,0x30,0x20,/* X  56 */
    0x08,0x38,0xC8,0x00,0xC8,0x38,0x08,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,/* Y  57 */
    0x10,0x08,0x08,0x08,0xC8,0x38,0x08,0x00,0x20,0x38,0x26,0x21,0x20,0x20,0x18,0x00,/* Z  58 */
    0x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x00,0x00,0x00,0x00,0x7F,0x40,0x40,0x40,0x00,/* [  59 */
    0x00,0x0C,0x30,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x06,0x38,0xC0,0x00,/* \  60 */
    0x00,0x02,0x02,0x02,0xFE,0x00,0x00,0x00,0x00,0x40,0x40,0x40,0x7F,0x00,0x00,0x00,/* ]  61 */
    0x00,0x00,0x04,0x02,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,/* ^  62 */
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,/* _  63 */
    0x00,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,/* `  64 */
    0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x19,0x24,0x22,0x22,0x22,0x3F,0x20,/* a  65 */
    0x08,0xF8,0x00,0x80,0x80,0x00,0x00,0x00,0x00,0x3F,0x11,0x20,0x20,0x11,0x0E,0x00,/* b  66 */
    0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00,0x00,0x0E,0x11,0x20,0x20,0x20,0x11,0x00,/* c  67 */
    0x00,0x00,0x00,0x80,0x80,0x88,0xF8,0x00,0x00,0x0E,0x11,0x20,0x20,0x10,0x3F,0x20,/* d  68 */
    0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x22,0x22,0x22,0x22,0x13,0x00,/* e  69 */
    0x00,0x80,0x80,0xF0,0x88,0x88,0x88,0x18,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,/* f  70 */
    0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x6B,0x94,0x94,0x94,0x93,0x60,0x00,/* g  71 */
    0x08,0xF8,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,/* h  72 */
    0x00,0x80,0x98,0x98,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,/* i  73 */
    0x00,0x00,0x00,0x80,0x98,0x98,0x00,0x00,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,/* j  74 */
    0x08,0xF8,0x00,0x00,0x80,0x80,0x80,0x00,0x20,0x3F,0x24,0x02,0x2D,0x30,0x20,0x00,/* k  75 */
    0x00,0x08,0x08,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,/* l  76 */
    0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x20,0x3F,0x20,0x00,0x3F,0x20,0x00,0x3F,/* m  77 */
    0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,/* n  78 */
    0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,/* o  79 */
    0x80,0x80,0x00,0x80,0x80,0x00,0x00,0x00,0x80,0xFF,0xA1,0x20,0x20,0x11,0x0E,0x00,/* p  80 */
    0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x0E,0x11,0x20,0x20,0xA0,0xFF,0x80,/* q  81 */
    0x80,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x20,0x20,0x3F,0x21,0x20,0x00,0x01,0x00,/* r  82 */
    0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x33,0x24,0x24,0x24,0x24,0x19,0x00,/* s  83 */
    0x00,0x80,0x80,0xE0,0x80,0x80,0x00,0x00,0x00,0x00,0x00,0x1F,0x20,0x20,0x00,0x00,/* t  84 */
    0x80,0x80,0x00,0x00,0x00,0x80,0x80,0x00,0x00,0x1F,0x20,0x20,0x20,0x10,0x3F,0x20,/* u  85 */
    0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x00,0x01,0x0E,0x30,0x08,0x06,0x01,0x00,/* v  86 */
    0x80,0x80,0x00,0x80,0x00,0x80,0x80,0x80,0x0F,0x30,0x0C,0x03,0x0C,0x30,0x0F,0x00,/* w  87 */
    0x00,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x31,0x2E,0x0E,0x31,0x20,0x00,/* x  88 */
    0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x80,0x81,0x8E,0x70,0x18,0x06,0x01,0x00,/* y  89 */
    0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x21,0x30,0x2C,0x22,0x21,0x30,0x00,/* z  90 */
    0x00,0x00,0x00,0x00,0x80,0x7C,0x02,0x02,0x00,0x00,0x00,0x00,0x00,0x3F,0x40,0x40,/* {  91 */
    0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,/* |  92 */
    0x00,0x02,0x02,0x7C,0x80,0x00,0x00,0x00,0x00,0x40,0x40,0x3F,0x00,0x00,0x00,0x00,/* }  93 */
    0x00,0x06,0x01,0x01,0x02,0x02,0x04,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,/* ~  94 */
};

/*+--------------------------------+
 *|      BMP Logo for 128x32       |
 *+--------------------------------+*/

/* lingyun-128x32.bmp 使用 PCtoLCD.exe 取模软件生成配置(图形模式)： 阴码、列行式、逆向、十六进制数、C51格式  */
const uint8_t bmp_logo[] = {
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x03,0xFF,0xFF,0x03,0x03,0x00,0x00,
    0x00,0xFC,0xFE,0x87,0x03,0x03,0x87,0xFE,0xFC,0x00,0x03,0x03,0xFF,0xFF,0x03,0x03,
    0x00,0x00,0xF8,0xF8,0xF8,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x78,0x78,0x78,0x78,0x00,0x00,0x00,0x80,0xC0,0xE0,0xF0,0xF8,0xF8,0x78,0x78,0x78,
    0xF8,0xF8,0xF8,0xF0,0xE0,0x80,0x00,0x00,0x00,0x80,0x80,0xE0,0xE0,0xF0,0xF0,0x78,
    0x78,0x78,0x78,0x78,0x78,0xF0,0xF0,0xE0,0xE0,0xC0,0x80,0x00,0x00,0xF0,0xF0,0xF0,
    0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0xF0,0xF0,0xF0,0xF0,0xF0,0x00,0x00,0xF0,0xF0,
    0xF0,0xF0,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0xF0,0xF0,0xF0,0xF0,0x00,0x00,0x00,
    0xC0,0xE0,0xF0,0xF8,0xF8,0xF8,0xF8,0xF8,0xFB,0xFB,0xF3,0xF3,0xE3,0xC3,0x00,0x03,
    0x03,0x00,0x01,0x03,0x03,0x03,0x03,0x01,0x00,0x03,0x03,0x00,0x03,0x03,0x00,0x00,
    0x00,0x00,0xFF,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0xFF,0xFF,0xFF,0xFF,0x00,0x00,0x00,0xFF,0xFF,0xFF,0xFF,0x01,0x00,0x00,0x00,0x00,
    0x00,0x01,0xFF,0xFF,0xFF,0xFF,0x00,0x00,0xFF,0xFF,0xFF,0xFF,0x07,0x03,0x00,0x00,
    0x00,0x00,0xE0,0xE0,0xE0,0xE0,0xE1,0xE3,0xE3,0xE3,0xE3,0xE0,0x00,0x1F,0x3F,0x7F,
    0xFF,0xFC,0xF0,0xE0,0xF0,0xF0,0xF8,0xFF,0xFF,0xFF,0x3F,0x1F,0x00,0x00,0xFF,0xFF,
    0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0xFF,0xFF,0x00,0x00,0x00,
    0xFF,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0xFF,0xFF,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x7F,0x7F,0x7F,0x7F,0x70,0x70,0x70,0x70,0x70,0x70,0x70,0x70,0x00,0x00,
    0x7F,0x7F,0x7F,0x7F,0x00,0x00,0x00,0x7F,0x7F,0x7F,0x7F,0x00,0x00,0x00,0x00,0x00,
    0x00,0x00,0x7F,0x7F,0x7F,0x7F,0x00,0x00,0x03,0x0F,0x1F,0x3F,0x7E,0x7C,0x78,0x70,
    0x70,0x60,0x61,0x71,0x71,0x7F,0x7F,0x7F,0x3F,0x1F,0x07,0x03,0x00,0x00,0x00,0x00,
    0x00,0x01,0x7F,0x7F,0x7F,0x7F,0x7F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0F,0x1F,
    0x3F,0x7F,0x7F,0x78,0x70,0x70,0x70,0x70,0x78,0x7F,0x3F,0x1F,0x0F,0x00,0x00,0x00,
    0x7F,0x7F,0x7F,0x7F,0x00,0x00,0x00,0x00,0x00,0x00,0x7F,0x7F,0x7F,0x7F,0x00,0x00,
    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
};

/*+--------------------------------+
 *|   Chinese Font 16x16 SongTi    |
 *+--------------------------------+*/

/* 汉字生成使用 PCtoLCD.exe(字符模式)：宋体、16x16、阴码、列行式、逆向、十六进制数、C51格式
 * 每个汉字 32 字节 (16x16 点阵, 上下各 16 字节分属两页)
 */

/*  宋体 16X16:  凌云实验室 */
const uint8_t Hzk_LingYun[][HZK_CHAR_BYTES]=
{
    {0x00,0x02,0x0C,0xC0,0x00,0x20,0xA4,0x64,0xA4,0x3F,0x24,0x64,0xA4,0x20,0x20,0x00},
    {0x02,0x02,0x7F,0x00,0x80,0x89,0x44,0x46,0x2B,0x12,0x2A,0x46,0x80,0x81,0x00,0x00},/*"凌",0*/

    {0x40,0x40,0x42,0x42,0x42,0x42,0xC2,0x42,0x42,0x42,0x42,0x42,0x42,0x40,0x40,0x00},
    {0x00,0x20,0x70,0x28,0x24,0x23,0x20,0x20,0x20,0x24,0x28,0x30,0xE0,0x00,0x00,0x00},/*"云",1*/

    {0x10,0x0C,0x04,0x84,0x14,0x64,0x05,0x06,0xF4,0x04,0x04,0x04,0x04,0x14,0x0C,0x00},
    {0x04,0x84,0x84,0x44,0x47,0x24,0x14,0x0C,0x07,0x0C,0x14,0x24,0x44,0x84,0x04,0x00},/*"实",2*/

    {0x02,0xFA,0x82,0x82,0xFE,0x80,0x40,0x20,0x50,0x4C,0x43,0x4C,0x50,0x20,0x40,0x00},
    {0x08,0x18,0x48,0x84,0x44,0x3F,0x40,0x44,0x58,0x41,0x4E,0x60,0x58,0x47,0x40,0x00},/*"验",3*/

    {0x10,0x0C,0x24,0x24,0xA4,0x64,0x25,0x26,0x24,0x24,0xA4,0x24,0x24,0x14,0x0C,0x00},
    {0x40,0x40,0x48,0x49,0x49,0x49,0x49,0x7F,0x49,0x49,0x49,0x4B,0x48,0x40,0x40,0x00},/*"室",4*/
};

/* 宋体 16x16： 温度 */
const uint8_t Hzk_Temp[][HZK_CHAR_BYTES]=
{
    {0x10,0x60,0x02,0x8C,0x00,0x00,0xFE,0x92,0x92,0x92,0x92,0x92,0xFE,0x00,0x00,0x00},
    {0x04,0x04,0x7E,0x01,0x40,0x7E,0x42,0x42,0x7E,0x42,0x7E,0x42,0x42,0x7E,0x40,0x00},/*"温",0*/

    {0x00,0x00,0xFC,0x24,0x24,0x24,0xFC,0x25,0x26,0x24,0xFC,0x24,0x24,0x24,0x04,0x00},
    {0x40,0x30,0x8F,0x80,0x84,0x4C,0x55,0x25,0x25,0x25,0x55,0x4C,0x80,0x80,0x80,0x00},/*"度",1*/
};

/* 宋体 16x16： 湿度 */
const uint8_t Hzk_Humd[][HZK_CHAR_BYTES]=
{
    {0x10,0x60,0x02,0x8C,0x00,0xFE,0x92,0x92,0x92,0x92,0x92,0x92,0xFE,0x00,0x00,0x00},
    {0x04,0x04,0x7E,0x01,0x44,0x48,0x50,0x7F,0x40,0x40,0x7F,0x50,0x48,0x44,0x40,0x00},/*"湿",0*/

    {0x00,0x00,0xFC,0x24,0x24,0x24,0xFC,0x25,0x26,0x24,0xFC,0x24,0x24,0x24,0x04,0x00},
    {0x40,0x30,0x8F,0x80,0x84,0x4C,0x55,0x25,0x25,0x25,0x55,0x4C,0x80,0x80,0x80,0x00},/*"度",1*/
};

/* 宋体 16X16: 光强 */
const uint8_t Hzk_Light[][HZK_CHAR_BYTES]=
{
    {0x40,0x40,0x42,0x44,0x58,0xC0,0x40,0x7F,0x40,0xC0,0x50,0x48,0x46,0x40,0x40,0x00},
    {0x80,0x80,0x40,0x20,0x18,0x07,0x00,0x00,0x00,0x3F,0x40,0x40,0x40,0x40,0x78,0x00},/*"光",0*/

    {0x02,0xE2,0x22,0x22,0x3E,0x00,0x80,0x9E,0x92,0x92,0xF2,0x92,0x92,0x9E,0x80,0x00},
    {0x00,0x43,0x82,0x42,0x3E,0x40,0x47,0x44,0x44,0x44,0x7F,0x44,0x44,0x54,0xE7,0x00},/*"强",1*/
};

/* 宋体 16X16:  声音 */
const uint8_t Hzk_Noisy[][HZK_CHAR_BYTES]=
{
    {0x04,0x14,0xD4,0x54,0x54,0x54,0x54,0xDF,0x54,0x54,0x54,0x54,0xD4,0x14,0x04,0x00},
    {0x80,0x60,0x1F,0x02,0x02,0x02,0x02,0x03,0x02,0x02,0x02,0x02,0x03,0x00,0x00,0x00},/*"声",0*/

    {0x40,0x40,0x44,0x44,0x54,0x64,0x45,0x46,0x44,0x64,0x54,0x44,0x44,0x40,0x40,0x00},
    {0x00,0x00,0x00,0xFF,0x49,0x49,0x49,0x49,0x49,0x49,0x49,0xFF,0x00,0x00,0x00,0x00},/*"音",1*/
};

 ex2.i2c-bitbang/Board/oled_font.h

New file
@@ -0,0 +1,64 @@
/**********************************************************************
*   Copyright: (C)2021 LingYun IoT System Studio <www.weike-iot.com>
*      Author: GuoWenxue<guowenxue@gmail.com> QQ: 281143292
* Description: ISKBoard OLED font data (PCtoLCD.exe generated)
*
*   ChangeLog:
*        Version    Date       Author            Description
*        V1.0.0  2021.08.10  GuoWenxue      Release initial version
***********************************************************************/

#ifndef __OLED_FONT_H
#define __OLED_FONT_H

#include <stdint.h>

/*+--------------------------------+
 *|      ASCII font size 6x8       |
 *+--------------------------------+*/
#define F6x8_COUNT  95
extern const uint8_t F6x8[][6];

/*+--------------------------------+
 *|      ASCII font size 8x16      |
 *+--------------------------------+*/
#define F8X16_CHAR_BYTES  16
#define F8X16_COUNT       95
extern const uint8_t F8X16[];

/*+--------------------------------+
 *|      BMP Logo for 128x32       |
 *+--------------------------------+*/
#define BMP_LOGO_WIDTH   128
#define BMP_LOGO_HEIGHT  32
#define BMP_LOGO_SIZE    (BMP_LOGO_WIDTH * BMP_LOGO_HEIGHT / 8)
extern const uint8_t bmp_logo[];

/*+--------------------------------+
 *|   Chinese Font 16x16 SongTi    |
 *+--------------------------------+*/

/* 每个汉字 32 字节 (16x16 点阵, 上下各 16 字节分属两页) */
#define HZK_CHAR_BYTES  32

/* 宋体 16X16: 凌云实验室 */
#define HZK_LEN_LINGYUN         5
extern const uint8_t Hzk_LingYun[][HZK_CHAR_BYTES];

/* 宋体 16x16： 温度 */
#define HZK_LEN_TEMP            2
extern const uint8_t Hzk_Temp[][HZK_CHAR_BYTES];

/* 宋体 16x16： 湿度 */
#define HZK_LEN_HUMD            2
extern const uint8_t Hzk_Humd[][HZK_CHAR_BYTES];

/* 宋体 16X16: 光强 */
#define HZK_LEN_LIGHT            2
extern const uint8_t Hzk_Light[][HZK_CHAR_BYTES];

/* 宋体 16X16:  声音 */
#define HZK_LEN_NOISY            2
extern const uint8_t Hzk_Noisy[][HZK_CHAR_BYTES];

#endif /* __OLED_FONT_H */

 ex2.i2c-bitbang/Board/sht20.c

New file
@@ -0,0 +1,226 @@
/**********************************************************************
 *   Copyright: (C)2024 LingYun IoT System Studio
 *      Author: GuoWenxue<guowenxue@gmail.com>
 *
 * Description: SHT20 Temperature & humidity sensor driver on ISKBoard
 *
 *   ChangeLog:
 *        Version    Date       Author            Description
 *        V1.0.0  2024.08.29    GuoWenxue      Release initial version
 *
 ***********************************************************************/

#include <stdio.h>
#include "sht20.h"
#include "miscdev.h" /* udelay() / mdelay() */

/* SHT20 7位标准 I2C 从机地址 */
#define SHT20_I2C_ADDR          0x40

/* SHT20 控制指令 (No Hold Master) */
#define SHT20_CMD_TRIG_T        0xF3  /* 触发温度测量 (非阻塞) */
#define SHT20_CMD_TRIG_RH       0xF5  /* 触发湿度测量 (非阻塞) */
#define SHT20_CMD_SOFT_RESET    0xFE  /* 软件复位 */

/* I2C 设备 SHT20 */
static     i2c_dev_t sht20;

/* 前置静态辅助函数声明 */
static uint8_t sht20_check_crc(uint8_t *data, uint8_t nbytes, uint8_t checksum);
i2c_status_t sht20_read_value(i2c_dev_t *sht20, uint8_t cmd, float *value);

/**
 * @brief  SHT20 初始化并软复位芯片
 * @param  bus: 绑定的 I2C 物理总线指针
 * @retval 0: 成功; -1: 失败
 */
int sht20_init(i2c_bus_t *bus)
{
    uint8_t cmd = SHT20_CMD_SOFT_RESET;
    int rv = 0;

    if (!bus)
    {
        return -1;
    }

    mdelay(20);

    /* 绑定设备及其设备号到 I2C 总线上 */
    i2c_bind_dev(&sht20, bus, SHT20_I2C_ADDR);

    /* 将I2C总线加锁让设备独占总线 */
    i2c_lock_dev(&sht20);

    /* 向 SHT20 发送软件复位指令，并等待复位完成 */
    i2c_write_no_reg(sht20.bus, sht20.dev_addr, &cmd, 1);
    mdelay(20);

    /* 释放设备的 I2C 总线锁 */
    i2c_free_dev(&sht20);
    return rv;
}

/**
 * @brief  应用层温湿度采样接口函数 (带总线锁)
 * @param  temperature: 存放输出温度结果的指针
 * @param  humidity:    存放输出湿度结果的指针
 * @retval 0: 采样成功且CRC通过; -1: 采样或校验失败
 */
int sht20_sample_TrH(float *temperature, float *humidity)
{
    int rv = -1;

    if( !temperature || !humidity )
    {
        return -1;
    }

    /* 将I2C总线加锁让设备独占总线 */
    i2c_lock_dev(&sht20);

    /* 2. 采集温度 */
    if (sht20_read_value(&sht20, SHT20_CMD_TRIG_T, temperature) != I2C_OK)
    {
        goto cleanup;
    }

    /* 3. 采集湿度 */
    if (sht20_read_value(&sht20, SHT20_CMD_TRIG_RH, humidity) != I2C_OK)
    {
        goto cleanup;
    }

    rv = 0;

cleanup:
    /* 4. 释放总线并解锁 */
    i2c_free_dev(&sht20);
    return rv;
}

/**
 * @brief  SHT20 硬件标准 CRC-8 校验
 * @note   多项式 P(x) = x^8 + x^5 + x^4 + 1 = 1 0011 0001 = 0x31
 * @param  data: 待校验的数据缓冲区指针 (含 High Byte 和 Low Byte)
 * @param  nbytes: 校验的数据长度 (固定为 2 字节)
 * @param  checksum: SHT20 芯片硬件返回的 CRC 结果字节
 * @retval 0: 校验通过; 其余值: 校验失败
 */
static uint8_t sht20_check_crc(uint8_t *data, uint8_t nbytes, uint8_t checksum)
{
    uint8_t crc = 0x00; /* 初始值为 0 */
    uint8_t byte_ctr;
    uint8_t bit;

    /* 逐个字节计算 */
    for (byte_ctr = 0; byte_ctr < nbytes; ++byte_ctr)
    {
        crc ^= (data[byte_ctr]);

        /* 按位进行模二除法 */
        for (bit = 8; bit > 0; --bit)
        {
            if (crc & 0x80)
            {
                crc = (uint8_t)((crc << 1) ^ 0x31);
            }
            else
            {
                crc = (uint8_t)(crc << 1);
            }
        }
    }

    if (crc != checksum)
    {
        return 1; /* 校验不匹配 */
    }

    return 0; /* 成功 */
}

/**
 * @brief  读取温湿度的底层通用核心函数 (加入完备的 CRC-8 硬件校验)
 */
i2c_status_t sht20_read_value(i2c_dev_t *dev, uint8_t cmd, float *value)
{
    uint8_t raw_data[2];
    uint8_t crc_byte;
    uint8_t rx_buf[3];
    uint16_t raw_result;
    uint32_t poll_timeout = 2000;
    i2c_status_t status;

    if ( !value )
    {
        return I2C_ERROR;
    }

    /* 1. 发送触发测量命令 (无寄存器写模式) */
    status = i2c_write_no_reg(dev->bus, dev->dev_addr, &cmd, 1);
    if (status != I2C_OK)
    {
        return I2C_ERROR;
    }

    /* 根据测量指令进行预留的 ADC 硬件转换安全延时 */
    if (cmd == SHT20_CMD_TRIG_T)
    {
        mdelay(65);
    }
    else
    {
        mdelay(25);
    }

    /* 2. 利用高级读 API 的内部寻址应答机制等待芯片转换完成 */
    while (poll_timeout--)
    {
        /* SHT20 在进行 ADC 转换时，它会对读模式寻址返回 NACK。
         * i2c_read_no_reg() 发现地址无应答，会自动发 Stop 并返回错误。
         * 我们直接利用这一机制作为非阻塞就绪判断！
         */
        status = i2c_read_no_reg(dev->bus, dev->dev_addr, rx_buf, 3);
        if (status == I2C_OK)
        {
            /* 读取成功，3 字节（高、低、CRC）*/
            break;
        }

        udelay(100);
    }

    if (poll_timeout == 0)
    {
        return I2C_ERROR;
    }

    /* 3. 分离出读回的 High Byte, Low Byte 以及 CRC 校验码 */
    raw_data[0] = rx_buf[0];
    raw_data[1] = rx_buf[1];
    crc_byte    = rx_buf[2];

    /* 4. 执行 CRC-8 校验 */
    if (sht20_check_crc(raw_data, 2, crc_byte) != 0)
    {
        printf("SHT20 CRC Check Failed!\r\n");
        return I2C_ERROR;
    }

    /* 5. 清除低 2 位状态位 */
    raw_result = (uint16_t)((raw_data[0] << 8) | raw_data[1]);
    raw_result &= ~0x0003;

    /* 6. 代入物理公式转换 */
    if (cmd == SHT20_CMD_TRIG_T)
    {
        *value = -46.85f + 175.72f * ((float)raw_result / 65536.0f);
    }
    else
    {
        *value = -6.0f + 125.0f * ((float)raw_result / 65536.0f);
    }

    return I2C_OK;
}

 ex2.i2c-bitbang/Board/sht20.h

New file
@@ -0,0 +1,33 @@
/**********************************************************************
 *   Copyright: (C)2024 LingYun IoT System Studio
 *      Author: GuoWenxue<guowenxue@gmail.com>
 *
 * Description: SHT20 Temperature & humidity sensor driver on ISKBoard
 *
 *   ChangeLog:
 *        Version    Date       Author            Description
 *        V1.0.0  2024.08.29    GuoWenxue      Release initial version
 *
 ***********************************************************************/

#ifndef __SHT20_H
#define __SHT20_H

#include "i2c_bitbang.h"

/**
 * @brief  SHT20 初始化并软复位芯片
 * @param  bus: 绑定的 I2C 物理总线指针
 * @retval 0: 成功; -1: 失败
 */
extern int sht20_init(i2c_bus_t *bus);

/**
 * @brief  应用层温湿度采样接口函数
 * @param  temperature: 存放输出温度结果的指针
 * @param  humidity:    存放输出湿度结果的指针
 * @retval 0: 采样成功且CRC通过; -1: 采样或校验失败
 */
extern int sht20_sample_TrH(float *temperature, float *humidity);

#endif

 ex2.i2c-bitbang/CMakeLists.txt

New file
@@ -0,0 +1,75 @@
cmake_minimum_required(VERSION 3.22)

#
# This file is generated only once,
# and is not re-generated if converter is called multiple times.
#
# User is free to modify the file as much as necessary
#

# Setup compiler settings
set(CMAKE_C_STANDARD 11)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_C_EXTENSIONS ON)


# Define the build type
if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE "Debug")
endif()

# Set the project name
set(CMAKE_PROJECT_NAME ISKBoard)

# Enable compile command to ease indexing with e.g. clangd
set(CMAKE_EXPORT_COMPILE_COMMANDS TRUE)

# Core project settings
project(${CMAKE_PROJECT_NAME})
message("Build type: " ${CMAKE_BUILD_TYPE})

# Enable CMake support for ASM and C languages
enable_language(C ASM)

# Create an executable object type
add_executable(${CMAKE_PROJECT_NAME})

# Add STM32CubeMX generated sources
add_subdirectory(cmake/stm32cubemx)

# Add our custom module subdirectories here
add_subdirectory(Board)

# Link directories setup
target_link_directories(${CMAKE_PROJECT_NAME} PRIVATE
    # Add user defined library search paths
)

# Add sources to executable
target_sources(${CMAKE_PROJECT_NAME} PRIVATE
    # Add user sources here
)

# Add include paths
target_include_directories(${CMAKE_PROJECT_NAME} PRIVATE
    # Add user defined include paths
)

# Add project symbols (macros)
target_compile_definitions(${CMAKE_PROJECT_NAME} PRIVATE
    # Add user defined symbols
)

# Remove wrong libob.a library dependency when using cpp files
list(REMOVE_ITEM CMAKE_C_IMPLICIT_LINK_LIBRARIES ob)

# Add linked libraries
target_link_libraries(${CMAKE_PROJECT_NAME}
    stm32cubemx
    board

    # Add user defined libraries
)

# Setup linker settings
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -u _printf_float")

 ex2.i2c-bitbang/Core/Src/main.c

New file
@@ -0,0 +1,323 @@
/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2026 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "adc.h"
#include "tim.h"
#include "usart.h"
#include "gpio.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "miscdev.h"
#include "sht20.h"
#include "ds18b20.h"
#include "isl1208.h"
#include "oled_drv.h"
#include "oled_font.h"
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/**
 * @brief  OLED显示时间
 */
void oled_show_time(void)
{
  rtc_time_t  tm;
  char buf[64];

  /* 获取RTC时间并保存到 buf */
  isl1208_get_time(&tm);
  snprintf(buf, sizeof(buf), "20%02d-%02d-%02d %02d:%02d:%02d",
            tm.year, tm.month, tm.day,
            tm.hour, tm.minute, tm.second);

  /* 输出显示内容 OLED 屏幕上 */
  OLED_Clear();
  OLED_ShowString(10, OLED_PAGE2, buf, OLED_FONT8);
  OLED_Refresh();

  return;
}

void oled_show_rh(void)
{
  float temperature = 0.0;
  float humidity = 0.0;
  char  buf[64];

  /* 采样并输出显示内容到 buf */
  sht20_sample_TrH(&temperature, &humidity);
  snprintf(buf, sizeof(buf), "%.2f'C  %.2f%%RH", temperature, humidity);

  /* 输出显示内容 OLED 屏幕上 */
  OLED_Clear();
  OLED_ShowString(10, OLED_PAGE2, buf, OLED_FONT8);
  OLED_Refresh();

  return;
}

void oled_show_logo(void)
{
  /* 输出显示内容 OLED 屏幕上 */
  OLED_Clear();
  OLED_DrawBMP(0, OLED_PAGE0, BMP_LOGO_WIDTH, BMP_LOGO_HEIGHT, bmp_logo);
  OLED_Refresh();

  return;
}

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{

  /* USER CODE BEGIN 1 */
  float temperature;
  /* 各个任务的计时基准 */
  uint32_t now = 0;
  uint32_t last_time_tick = 0;
  uint32_t last_rh_tick = 0;
  uint32_t last_logo_tick = 0;
  uint32_t display_unlock_time = 0;

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_USART1_UART_Init();
  MX_ADC1_Init();
  MX_TIM6_Init();
  MX_TIM1_Init();
  /* USER CODE BEGIN 2 */
  init_led();
  i2c_init(&i2c1_bus);

  beep_start(2, 300);
  printf("ISKBoard: I2C Bitbang Drivers Demo.\r\n");

  if( sht20_init(&i2c1_bus) != 0 )
  {
      printf("SHT20 Sensor init failed!\r\n");
  }

  if( isl1208_init(&i2c1_bus) != 0 )
  {
      printf("ISL1208 RTC init failed!\r\n");
  }
  isl1208_set_time_str("2026-07-09 21:15:30");

  if( OLED_Init(&i2c1_bus) != 0 )
  {
      printf("OLED display init failed!\r\n");
  }

  OLED_Clear();
  OLED_ShowString(30, OLED_PAGE2, "ISKBoard", OLED_FONT16);
  OLED_Refresh();

  ds18b20_sample(&temperature);
  printf("DS18B20 sample temperature: %.2f'C\r\n", temperature);

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* 获取当前系统时间 */
    now = HAL_GetTick();

    /* 心跳灯任务：不需要锁屏，始终高频调用 */
    heartbeat_led(3);

    /* 检查屏幕是否处于“锁定”状态 (正在显示温湿度或Logo) */
    if (now >= display_unlock_time)
    {
        /* 优先检查是否有高优先级任务触发 (Logo -> 温湿度) */
        uint8_t is_displaying = 0;

        /* 每隔 13s 显示 Logo，持续 1s */
        if (now - last_logo_tick >= 13000)
        {
            oled_show_logo();          // 执行显示
            last_logo_tick = now;      // 重置Logo计时器
            display_unlock_time = now + 1000;
            is_displaying = 1;
        }

        /* 如果Logo刚显示了，本轮跳过温湿度 */
        else if (now - last_rh_tick >= 5000)
        {
            oled_show_rh();            // 执行显示
            last_rh_tick = now;        // 重置温湿度计时器
            display_unlock_time = now + 2000; // 锁屏 2s
            is_displaying = 1;
        }

        /* 如果上面都没有显示特殊内容，则显示时间 */
        if (is_displaying == 0)
        {
            if (now - last_time_tick >= 1000)
            {
                oled_show_time();      // 执行显示
                last_time_tick = now;  // 重置时间计时器
            }
        }
    }

    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage
  */
  if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 1;
  RCC_OscInitStruct.PLL.PLLN = 20;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
  {
    Error_Handler();
  }
}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

 ex2.i2c-bitbang/ISKBoard.ioc

New file
@@ -0,0 +1,210 @@
#MicroXplorer Configuration settings - do not modify
ADC1.Channel-0\#ChannelRegularConversion=ADC_CHANNEL_15
ADC1.CommonPathInternal=null|null|null|null
ADC1.IPParameters=Rank-0\#ChannelRegularConversion,Channel-0\#ChannelRegularConversion,SamplingTime-0\#ChannelRegularConversion,OffsetNumber-0\#ChannelRegularConversion,NbrOfConversionFlag,master,NbrOfConversion,CommonPathInternal
ADC1.NbrOfConversion=1
ADC1.NbrOfConversionFlag=1
ADC1.OffsetNumber-0\#ChannelRegularConversion=ADC_OFFSET_NONE
ADC1.Rank-0\#ChannelRegularConversion=1
ADC1.SamplingTime-0\#ChannelRegularConversion=ADC_SAMPLETIME_2CYCLES_5
ADC1.master=1
CAD.formats=
CAD.pinconfig=
CAD.provider=
File.Version=6
GPIO.groupedBy=Group By Peripherals
KeepUserPlacement=false
Mcu.CPN=STM32L431RCT6
Mcu.Family=STM32L4
Mcu.IP0=ADC1
Mcu.IP1=NVIC
Mcu.IP2=RCC
Mcu.IP3=SYS
Mcu.IP4=TIM1
Mcu.IP5=TIM6
Mcu.IP6=USART1
Mcu.IPNb=7
Mcu.Name=STM32L431R(B-C)Tx
Mcu.Package=LQFP64
Mcu.Pin0=PC14-OSC32_IN (PC14)
Mcu.Pin1=PC15-OSC32_OUT (PC15)
Mcu.Pin10=PC6
Mcu.Pin11=PC9
Mcu.Pin12=PA9
Mcu.Pin13=PA10
Mcu.Pin14=PA11
Mcu.Pin15=PD2
Mcu.Pin16=VP_SYS_VS_Systick
Mcu.Pin17=VP_TIM6_VS_ClockSourceINT
Mcu.Pin2=PH0-OSC_IN (PH0)
Mcu.Pin3=PH1-OSC_OUT (PH1)
Mcu.Pin4=PB0
Mcu.Pin5=PB1
Mcu.Pin6=PB2
Mcu.Pin7=PB12
Mcu.Pin8=PB13
Mcu.Pin9=PB14
Mcu.PinsNb=18
Mcu.ThirdPartyNb=0
Mcu.UserConstants=
Mcu.UserName=STM32L431RCTx
MxCube.Version=6.18.0
MxDb.Version=DB.6.0.180
NVIC.BusFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
NVIC.DebugMonitor_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
NVIC.EXTI15_10_IRQn=true\:2\:0\:true\:false\:true\:true\:true\:true
NVIC.ForceEnableDMAVector=true
NVIC.HardFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
NVIC.MemoryManagement_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
NVIC.NonMaskableInt_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
NVIC.PendSV_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
NVIC.PriorityGroup=NVIC_PRIORITYGROUP_4
NVIC.SVCall_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
NVIC.SysTick_IRQn=true\:1\:0\:true\:false\:true\:false\:true\:false
NVIC.UsageFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false\:false
PA10.Mode=Asynchronous
PA10.Signal=USART1_RX
PA11.GPIOParameters=GPIO_PuPd
PA11.GPIO_PuPd=GPIO_PULLDOWN
PA11.Locked=true
PA11.Signal=S_TIM1_CH4
PA9.Mode=Asynchronous
PA9.Signal=USART1_TX
PB0.Signal=ADCx_IN15
PB1.Signal=ADCx_IN16
PB12.GPIOParameters=GPIO_ModeDefaultEXTI
PB12.GPIO_ModeDefaultEXTI=GPIO_MODE_IT_FALLING
PB12.Locked=true
PB12.Signal=GPXTI12
PB13.GPIOParameters=GPIO_ModeDefaultEXTI
PB13.GPIO_ModeDefaultEXTI=GPIO_MODE_IT_FALLING
PB13.Locked=true
PB13.Signal=GPXTI13
PB14.GPIOParameters=GPIO_ModeDefaultEXTI
PB14.GPIO_ModeDefaultEXTI=GPIO_MODE_IT_FALLING
PB14.Locked=true
PB14.Signal=GPXTI14
PB2.Locked=true
PB2.Signal=GPIO_Output
PC14-OSC32_IN\ (PC14).Mode=LSE-External-Oscillator
PC14-OSC32_IN\ (PC14).Signal=RCC_OSC32_IN
PC15-OSC32_OUT\ (PC15).Mode=LSE-External-Oscillator
PC15-OSC32_OUT\ (PC15).Signal=RCC_OSC32_OUT
PC6.Locked=true
PC6.Signal=GPIO_Output
PC9.Locked=true
PC9.Signal=GPIO_Output
PD2.Locked=true
PD2.Signal=GPIO_Output
PH0-OSC_IN\ (PH0).Mode=HSE-External-Oscillator
PH0-OSC_IN\ (PH0).Signal=RCC_OSC_IN
PH1-OSC_OUT\ (PH1).Mode=HSE-External-Oscillator
PH1-OSC_OUT\ (PH1).Signal=RCC_OSC_OUT
PinOutPanel.RotationAngle=0
ProjectManager.AskForMigrate=true
ProjectManager.BackupPrevious=false
ProjectManager.CompilerLinker=GCC
ProjectManager.CompilerOptimize=6
ProjectManager.ComputerToolchain=false
ProjectManager.CoupleFile=true
ProjectManager.CustomerFirmwarePackage=
ProjectManager.DefaultFWLocation=true
ProjectManager.DeletePrevious=true
ProjectManager.DeviceId=STM32L431RCTx
ProjectManager.FirmwarePackage=STM32Cube FW_L4 V1.18.2
ProjectManager.FreePins=false
ProjectManager.FreePinsContext=
ProjectManager.HalAssertFull=false
ProjectManager.HeapSize=0x200
ProjectManager.KeepUserCode=true
ProjectManager.LastFirmware=true
ProjectManager.LibraryCopy=1
ProjectManager.MainLocation=Core/Src
ProjectManager.NoMain=false
ProjectManager.PreviousToolchain=
ProjectManager.ProjectBuild=false
ProjectManager.ProjectFileName=ISKBoard.ioc
ProjectManager.ProjectName=ISKBoard
ProjectManager.ProjectStructure=
ProjectManager.RegisterCallBack=
ProjectManager.StackSize=0x400
ProjectManager.TargetToolchain=CMake
ProjectManager.ToolChainLocation=
ProjectManager.UAScriptAfterPath=
ProjectManager.UAScriptBeforePath=
ProjectManager.UnderRoot=false
ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-HAL-false,2-MX_GPIO_Init-GPIO-false-HAL-true,3-MX_USART1_UART_Init-USART1-false-HAL-true,4-MX_ADC1_Init-ADC1-false-HAL-true,5-MX_TIM6_Init-TIM6-false-HAL-true,6-MX_TIM1_Init-TIM1-false-HAL-true
RCC.ADCFreq_Value=32000000
RCC.AHBFreq_Value=80000000
RCC.APB1Freq_Value=80000000
RCC.APB1TimFreq_Value=80000000
RCC.APB2Freq_Value=80000000
RCC.APB2TimFreq_Value=80000000
RCC.CortexFreq_Value=80000000
RCC.FCLKCortexFreq_Value=80000000
RCC.FamilyName=M
RCC.HCLKFreq_Value=80000000
RCC.HSE_VALUE=8000000
RCC.HSI48_VALUE=48000000
RCC.HSI_VALUE=16000000
RCC.I2C1Freq_Value=80000000
RCC.I2C2Freq_Value=80000000
RCC.I2C3Freq_Value=80000000
RCC.IPParameters=ADCFreq_Value,AHBFreq_Value,APB1Freq_Value,APB1TimFreq_Value,APB2Freq_Value,APB2TimFreq_Value,CortexFreq_Value,FCLKCortexFreq_Value,FamilyName,HCLKFreq_Value,HSE_VALUE,HSI48_VALUE,HSI_VALUE,I2C1Freq_Value,I2C2Freq_Value,I2C3Freq_Value,LPTIM1Freq_Value,LPTIM2Freq_Value,LPUART1Freq_Value,LSCOPinFreq_Value,LSI_VALUE,MCO1PinFreq_Value,MSI_VALUE,PLLN,PLLPoutputFreq_Value,PLLQoutputFreq_Value,PLLRCLKFreq_Value,PLLSAI1PoutputFreq_Value,PLLSAI1QoutputFreq_Value,PLLSAI1RoutputFreq_Value,PLLSourceVirtual,PWRFreq_Value,RNGFreq_Value,SAI1Freq_Value,SDMMCFreq_Value,SWPMI1Freq_Value,SYSCLKFreq_VALUE,SYSCLKSource,USART1Freq_Value,USART2Freq_Value,USART3Freq_Value,VCOInputFreq_Value,VCOOutputFreq_Value,VCOSAI1OutputFreq_Value
RCC.LPTIM1Freq_Value=80000000
RCC.LPTIM2Freq_Value=80000000
RCC.LPUART1Freq_Value=80000000
RCC.LSCOPinFreq_Value=32000
RCC.LSI_VALUE=32000
RCC.MCO1PinFreq_Value=80000000
RCC.MSI_VALUE=4000000
RCC.PLLN=20
RCC.PLLPoutputFreq_Value=22857142.85714286
RCC.PLLQoutputFreq_Value=80000000
RCC.PLLRCLKFreq_Value=80000000
RCC.PLLSAI1PoutputFreq_Value=9142857.142857144
RCC.PLLSAI1QoutputFreq_Value=32000000
RCC.PLLSAI1RoutputFreq_Value=32000000
RCC.PLLSourceVirtual=RCC_PLLSOURCE_HSE
RCC.PWRFreq_Value=80000000
RCC.RNGFreq_Value=32000000
RCC.SAI1Freq_Value=9142857.142857144
RCC.SDMMCFreq_Value=32000000
RCC.SWPMI1Freq_Value=80000000
RCC.SYSCLKFreq_VALUE=80000000
RCC.SYSCLKSource=RCC_SYSCLKSOURCE_PLLCLK
RCC.USART1Freq_Value=80000000
RCC.USART2Freq_Value=80000000
RCC.USART3Freq_Value=80000000
RCC.VCOInputFreq_Value=8000000
RCC.VCOOutputFreq_Value=160000000
RCC.VCOSAI1OutputFreq_Value=64000000
SH.ADCx_IN15.0=ADC1_IN15,IN15-Single-Ended
SH.ADCx_IN15.ConfNb=1
SH.ADCx_IN16.0=ADC1_IN16,IN16-Single-Ended
SH.ADCx_IN16.ConfNb=1
SH.GPXTI12.0=GPIO_EXTI12
SH.GPXTI12.ConfNb=1
SH.GPXTI13.0=GPIO_EXTI13
SH.GPXTI13.ConfNb=1
SH.GPXTI14.0=GPIO_EXTI14
SH.GPXTI14.ConfNb=1
SH.S_TIM1_CH4.0=TIM1_CH4,PWM Generation4 CH4
SH.S_TIM1_CH4.ConfNb=1
TIM1.Channel-PWM\ Generation4\ CH4=TIM_CHANNEL_4
TIM1.IPParameters=Channel-PWM Generation4 CH4,Prescaler,RepetitionCounter,Period,Pulse-PWM Generation4 CH4
TIM1.Period=370-1
TIM1.Prescaler=80-1
TIM1.Pulse-PWM\ Generation4\ CH4=185
TIM1.RepetitionCounter=0
TIM6.AutoReloadPreload=TIM_AUTORELOAD_PRELOAD_DISABLE
TIM6.IPParameters=Prescaler,Period,AutoReloadPreload
TIM6.Period=1
TIM6.Prescaler=80-1
USART1.IPParameters=VirtualMode-Asynchronous
USART1.VirtualMode-Asynchronous=VM_ASYNC
VP_SYS_VS_Systick.Mode=SysTick
VP_SYS_VS_Systick.Signal=SYS_VS_Systick
VP_TIM6_VS_ClockSourceINT.Mode=Enable_Timer
VP_TIM6_VS_ClockSourceINT.Signal=TIM6_VS_ClockSourceINT
board=custom

 ex2.i2c-bitbang/MDK-ARM/ISKBoard.uvoptx

New file
@@ -0,0 +1,753 @@
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<ProjectOpt xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="project_optx.xsd">

  <SchemaVersion>1.0</SchemaVersion>

  <Header>### uVision Project, (C) Keil Software</Header>

  <Extensions>
    <cExt>*.c</cExt>
    <aExt>*.s*; *.src; *.a*</aExt>
    <oExt>*.obj; *.o</oExt>
    <lExt>*.lib</lExt>
    <tExt>*.txt; *.h; *.inc; *.md</tExt>
    <pExt>*.plm</pExt>
    <CppX>*.cpp</CppX>
    <nMigrate>0</nMigrate>
  </Extensions>

  <DaveTm>
    <dwLowDateTime>0</dwLowDateTime>
    <dwHighDateTime>0</dwHighDateTime>
  </DaveTm>

  <Target>
    <TargetName>ISKBoard</TargetName>
    <ToolsetNumber>0x4</ToolsetNumber>
    <ToolsetName>ARM-ADS</ToolsetName>
    <TargetOption>
      <CLKADS>8000000</CLKADS>
      <OPTTT>
        <gFlags>1</gFlags>
        <BeepAtEnd>1</BeepAtEnd>
        <RunSim>0</RunSim>
        <RunTarget>1</RunTarget>
        <RunAbUc>0</RunAbUc>
      </OPTTT>
      <OPTHX>
        <HexSelection>1</HexSelection>
        <FlashByte>65535</FlashByte>
        <HexRangeLowAddress>0</HexRangeLowAddress>
        <HexRangeHighAddress>0</HexRangeHighAddress>
        <HexOffset>0</HexOffset>
      </OPTHX>
      <OPTLEX>
        <PageWidth>79</PageWidth>
        <PageLength>66</PageLength>
        <TabStop>8</TabStop>
        <ListingPath></ListingPath>
      </OPTLEX>
      <ListingPage>
        <CreateCListing>1</CreateCListing>
        <CreateAListing>1</CreateAListing>
        <CreateLListing>1</CreateLListing>
        <CreateIListing>0</CreateIListing>
        <AsmCond>1</AsmCond>
        <AsmSymb>1</AsmSymb>
        <AsmXref>0</AsmXref>
        <CCond>1</CCond>
        <CCode>0</CCode>
        <CListInc>0</CListInc>
        <CSymb>0</CSymb>
        <LinkerCodeListing>0</LinkerCodeListing>
      </ListingPage>
      <OPTXL>
        <LMap>1</LMap>
        <LComments>1</LComments>
        <LGenerateSymbols>1</LGenerateSymbols>
        <LLibSym>1</LLibSym>
        <LLines>1</LLines>
        <LLocSym>1</LLocSym>
        <LPubSym>1</LPubSym>
        <LXref>0</LXref>
        <LExpSel>0</LExpSel>
      </OPTXL>
      <OPTFL>
        <tvExp>1</tvExp>
        <tvExpOptDlg>0</tvExpOptDlg>
        <IsCurrentTarget>1</IsCurrentTarget>
      </OPTFL>
      <CpuCode>18</CpuCode>
      <DebugOpt>
        <uSim>0</uSim>
        <uTrg>1</uTrg>
        <sLdApp>1</sLdApp>
        <sGomain>1</sGomain>
        <sRbreak>1</sRbreak>
        <sRwatch>1</sRwatch>
        <sRmem>1</sRmem>
        <sRfunc>1</sRfunc>
        <sRbox>1</sRbox>
        <tLdApp>1</tLdApp>
        <tGomain>1</tGomain>
        <tRbreak>1</tRbreak>
        <tRwatch>1</tRwatch>
        <tRmem>1</tRmem>
        <tRfunc>1</tRfunc>
        <tRbox>1</tRbox>
        <tRtrace>1</tRtrace>
        <sRSysVw>1</sRSysVw>
        <tRSysVw>1</tRSysVw>
        <sRunDeb>0</sRunDeb>
        <sLrtime>0</sLrtime>
        <bEvRecOn>1</bEvRecOn>
        <bSchkAxf>0</bSchkAxf>
        <bTchkAxf>0</bTchkAxf>
        <nTsel>6</nTsel>
        <sDll></sDll>
        <sDllPa></sDllPa>
        <sDlgDll></sDlgDll>
        <sDlgPa></sDlgPa>
        <sIfile></sIfile>
        <tDll></tDll>
        <tDllPa></tDllPa>
        <tDlgDll></tDlgDll>
        <tDlgPa></tDlgPa>
        <tIfile></tIfile>
        <pMon>STLink\ST-LINKIII-KEIL_SWO.dll</pMon>
      </DebugOpt>
      <TargetDriverDllRegistry>
        <SetRegEntry>
          <Number>0</Number>
          <Key>ARMRTXEVENTFLAGS</Key>
          <Name>-L70 -Z18 -C0 -M0 -T1</Name>
        </SetRegEntry>
        <SetRegEntry>
          <Number>0</Number>
          <Key>DLGTARM</Key>
          <Name>(1010=-1,-1,-1,-1,0)(1007=-1,-1,-1,-1,0)(1008=-1,-1,-1,-1,0)(1009=-1,-1,-1,-1,0)(1012=-1,-1,-1,-1,0)</Name>
        </SetRegEntry>
        <SetRegEntry>
          <Number>0</Number>
          <Key>ARMDBGFLAGS</Key>
          <Name></Name>
        </SetRegEntry>
        <SetRegEntry>
          <Number>0</Number>
          <Key>DLGUARM</Key>
          <Name>(105=-1,-1,-1,-1,0)</Name>
        </SetRegEntry>
        <SetRegEntry>
          <Number>0</Number>
          <Key>UL2CM3</Key>
          <Name>UL2CM3(-S0 -C0 -P0 -FD20000000 -FC8000 -FN1 -FF0STM32L4xx_256 -FS08000000 -FL040000 -FP0($$Device:STM32L431RCTx$CMSIS\Flash\STM32L4xx_256.FLM))</Name>
        </SetRegEntry>
        <SetRegEntry>
          <Number>0</Number>
          <Key>ST-LINKIII-KEIL_SWO</Key>
          <Name>-U53FF69064885495006370487 -O2254 -SF10000 -C0 -A0 -I0 -HNlocalhost -HP7184 -P1 -N00("ARM CoreSight SW-DP (ARM Core") -D00(2BA01477) -L00(0) -TO131090 -TC10000000 -TT10000000 -TP21 -TDS8007 -TDT0 -TDC1F -TIEFFFFFFFF -TIP8 -FO7 -FD20000000 -FC1000 -FN1 -FF0STM32L4xx_256.FLM -FS08000000 -FL040000 -FP0($$Device:STM32L431RCTx$CMSIS\Flash\STM32L4xx_256.FLM)</Name>
        </SetRegEntry>
      </TargetDriverDllRegistry>
      <Breakpoint>
        <Bp>
          <Number>0</Number>
          <Type>0</Type>
          <LineNumber>95</LineNumber>
          <EnabledFlag>1</EnabledFlag>
          <Address>0</Address>
          <ByteObject>0</ByteObject>
          <HtxType>0</HtxType>
          <ManyObjects>0</ManyObjects>
          <SizeOfObject>0</SizeOfObject>
          <BreakByAccess>0</BreakByAccess>
          <BreakIfRCount>0</BreakIfRCount>
          <Filename>../Core/Src/main.c</Filename>
          <ExecCommand></ExecCommand>
          <Expression></Expression>
        </Bp>
        <Bp>
          <Number>1</Number>
          <Type>0</Type>
          <LineNumber>97</LineNumber>
          <EnabledFlag>1</EnabledFlag>
          <Address>0</Address>
          <ByteObject>0</ByteObject>
          <HtxType>0</HtxType>
          <ManyObjects>0</ManyObjects>
          <SizeOfObject>0</SizeOfObject>
          <BreakByAccess>0</BreakByAccess>
          <BreakIfRCount>0</BreakIfRCount>
          <Filename>../Core/Src/main.c</Filename>
          <ExecCommand></ExecCommand>
          <Expression></Expression>
        </Bp>
      </Breakpoint>
      <Tracepoint>
        <THDelay>0</THDelay>
      </Tracepoint>
      <DebugFlag>
        <trace>0</trace>
        <periodic>1</periodic>
        <aLwin>1</aLwin>
        <aCover>0</aCover>
        <aSer1>0</aSer1>
        <aSer2>0</aSer2>
        <aPa>0</aPa>
        <viewmode>1</viewmode>
        <vrSel>0</vrSel>
        <aSym>0</aSym>
        <aTbox>0</aTbox>
        <AscS1>0</AscS1>
        <AscS2>0</AscS2>
        <AscS3>0</AscS3>
        <aSer3>0</aSer3>
        <eProf>0</eProf>
        <aLa>0</aLa>
        <aPa1>0</aPa1>
        <AscS4>0</AscS4>
        <aSer4>0</aSer4>
        <StkLoc>1</StkLoc>
        <TrcWin>0</TrcWin>
        <newCpu>0</newCpu>
        <uProt>0</uProt>
      </DebugFlag>
      <LintExecutable></LintExecutable>
      <LintConfigFile></LintConfigFile>
      <bLintAuto>0</bLintAuto>
      <bAutoGenD>0</bAutoGenD>
      <LntExFlags>0</LntExFlags>
      <pMisraName></pMisraName>
      <pszMrule></pszMrule>
      <pSingCmds></pSingCmds>
      <pMultCmds></pMultCmds>
      <pMisraNamep></pMisraNamep>
      <pszMrulep></pszMrulep>
      <pSingCmdsp></pSingCmdsp>
      <pMultCmdsp></pMultCmdsp>
      <DebugDescription>
        <Enable>1</Enable>
        <EnableFlashSeq>0</EnableFlashSeq>
        <EnableLog>0</EnableLog>
        <Protocol>2</Protocol>
        <DbgClock>10000000</DbgClock>
      </DebugDescription>
    </TargetOption>
  </Target>

  <Group>
    <GroupName>Application/MDK-ARM</GroupName>
    <tvExp>0</tvExp>
    <tvExpOptDlg>0</tvExpOptDlg>
    <cbSel>0</cbSel>
    <RteFlg>0</RteFlg>
    <File>
      <GroupNumber>1</GroupNumber>
      <FileNumber>1</FileNumber>
      <FileType>2</FileType>
      <tvExp>0</tvExp>
      <tvExpOptDlg>0</tvExpOptDlg>
      <bDave2>0</bDave2>
      <PathWithFileName>startup_stm32l431xx.s</PathWithFileName>
      <FilenameWithoutPath>startup_stm32l431xx.s</FilenameWithoutPath>
      <RteFlg>0</RteFlg>
      <bShared>0</bShared>
    </File>
  </Group>

  <Group>
    <GroupName>Application/User/Core</GroupName>
    <tvExp>1</tvExp>
    <tvExpOptDlg>0</tvExpOptDlg>
    <cbSel>0</cbSel>
    <RteFlg>0</RteFlg>
    <File>
      <GroupNumber>2</GroupNumber>
      <FileNumber>2</FileNumber>
      <FileType>1</FileType>
      <tvExp>0</tvExp>
      <tvExpOptDlg>0</tvExpOptDlg>
      <bDave2>0</bDave2>
      <PathWithFileName>../Core/Src/main.c</PathWithFileName>
      <FilenameWithoutPath>main.c</FilenameWithoutPath>
      <RteFlg>0</RteFlg>
      <bShared>0</bShared>
    </File>
    <File>
      <GroupNumber>2</GroupNumber>
      <FileNumber>3</FileNumber>
      <FileType>1</FileType>
      <tvExp>0</tvExp>
      <tvExpOptDlg>0</tvExpOptDlg>
      <bDave2>0</bDave2>
      <PathWithFileName>../Core/Src/gpio.c</PathWithFileName>
      <FilenameWithoutPath>gpio.c</FilenameWithoutPath>
      <RteFlg>0</RteFlg>
      <bShared>0</bShared>
    </File>
    <File>
      <GroupNumber>2</GroupNumber>
      <FileNumber>4</FileNumber>
      <FileType>1</FileType>
      <tvExp>0</tvExp>
      <tvExpOptDlg>0</tvExpOptDlg>
      <bDave2>0</bDave2>
      <PathWithFileName>../Core/Src/adc.c</PathWithFileName>
      <FilenameWithoutPath>adc.c</FilenameWithoutPath>
      <RteFlg>0</RteFlg>
      <bShared>0</bShared>
    </File>
    <File>
      <GroupNumber>2</GroupNumber>
      <FileNumber>5</FileNumber>
      <FileType>1</FileType>
      <tvExp>0</tvExp>
      <tvExpOptDlg>0</tvExpOptDlg>
      <bDave2>0</bDave2>
      <PathWithFileName>../Core/Src/tim.c</PathWithFileName>
      <FilenameWithoutPath>tim.c</FilenameWithoutPath>
      <RteFlg>0</RteFlg>
      <bShared>0</bShared>
    </File>
    <File>
      <GroupNumber>2</GroupNumber>
      <FileNumber>6</FileNumber>
      <FileType>1</FileType>
      <tvExp>0</tvExp>
      <tvExpOptDlg>0</tvExpOptDlg>
      <bDave2>0</bDave2>
      <PathWithFileName>../Core/Src/usart.c</PathWithFileName>
      <FilenameWithoutPath>usart.c</FilenameWithoutPath>
      <RteFlg>0</RteFlg>
      <bShared>0</bShared>
    </File>
    <File>
      <GroupNumber>2</GroupNumber>
      <FileNumber>7</FileNumber>
      <FileType>1</FileType>
      <tvExp>0</tvExp>
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      <bDave2>0</bDave2>
      <PathWithFileName>../Core/Src/stm32l4xx_it.c</PathWithFileName>
      <FilenameWithoutPath>stm32l4xx_it.c</FilenameWithoutPath>
      <RteFlg>0</RteFlg>
      <bShared>0</bShared>
    </File>
    <File>
      <GroupNumber>2</GroupNumber>
      <FileNumber>8</FileNumber>
      <FileType>1</FileType>
      <tvExp>0</tvExp>
      <tvExpOptDlg>0</tvExpOptDlg>
      <bDave2>0</bDave2>
      <PathWithFileName>../Core/Src/stm32l4xx_hal_msp.c</PathWithFileName>
      <FilenameWithoutPath>stm32l4xx_hal_msp.c</FilenameWithoutPath>
      <RteFlg>0</RteFlg>
      <bShared>0</bShared>
    </File>
  </Group>

  <Group>
    <GroupName>Drivers/STM32L4xx_HAL_Driver</GroupName>
    <tvExp>0</tvExp>
    <tvExpOptDlg>0</tvExpOptDlg>
    <cbSel>0</cbSel>
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      <FileNumber>9</FileNumber>
      <FileType>1</FileType>
      <tvExp>0</tvExp>
      <tvExpOptDlg>0</tvExpOptDlg>
      <bDave2>0</bDave2>
      <PathWithFileName>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_adc.c</PathWithFileName>
      <FilenameWithoutPath>stm32l4xx_hal_adc.c</FilenameWithoutPath>
      <RteFlg>0</RteFlg>
      <bShared>0</bShared>
    </File>
    <File>
      <GroupNumber>3</GroupNumber>
      <FileNumber>10</FileNumber>
      <FileType>1</FileType>
      <tvExp>0</tvExp>
      <tvExpOptDlg>0</tvExpOptDlg>
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      <PathWithFileName>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_adc_ex.c</PathWithFileName>
      <FilenameWithoutPath>stm32l4xx_hal_adc_ex.c</FilenameWithoutPath>
      <RteFlg>0</RteFlg>
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    <File>
      <GroupNumber>3</GroupNumber>
      <FileNumber>11</FileNumber>
      <FileType>1</FileType>
      <tvExp>0</tvExp>
      <tvExpOptDlg>0</tvExpOptDlg>
      <bDave2>0</bDave2>
      <PathWithFileName>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal.c</PathWithFileName>
      <FilenameWithoutPath>stm32l4xx_hal.c</FilenameWithoutPath>
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    <File>
      <GroupNumber>3</GroupNumber>
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      <tvExpOptDlg>0</tvExpOptDlg>
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      <PathWithFileName>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_rcc.c</PathWithFileName>
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      <RteFlg>0</RteFlg>
      <bShared>0</bShared>
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    <File>
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      <FileNumber>13</FileNumber>
      <FileType>1</FileType>
      <tvExp>0</tvExp>
      <tvExpOptDlg>0</tvExpOptDlg>
      <bDave2>0</bDave2>
      <PathWithFileName>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_rcc_ex.c</PathWithFileName>
      <FilenameWithoutPath>stm32l4xx_hal_rcc_ex.c</FilenameWithoutPath>
      <RteFlg>0</RteFlg>
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    </File>
    <File>
      <GroupNumber>3</GroupNumber>
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 ex2.i2c-bitbang/MDK-ARM/ISKBoard.uvprojx

New file
@@ -0,0 +1,929 @@
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<Project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="project_projx.xsd">

  <SchemaVersion>2.1</SchemaVersion>

  <Header>### uVision Project, (C) Keil Software</Header>

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      <ToolsetNumber>0x4</ToolsetNumber>
      <ToolsetName>ARM-ADS</ToolsetName>
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          <Vendor>STMicroelectronics</Vendor>
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          <PackURL>http://www.keil.com/pack/</PackURL>
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          <SLE66AMisc></SLE66AMisc>
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          <BeforeMake>
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            <UserProg1Name></UserProg1Name>
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        <DllOption>
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        </DebugOption>
        <Utilities>
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            <RunIndependent>0</RunIndependent>
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          </Flash1>
          <bUseTDR>1</bUseTDR>
          <Flash2>BIN\UL2V8M.DLL</Flash2>
          <Flash3>"" ()</Flash3>
          <Flash4></Flash4>
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          <pFcArmRoot></pFcArmRoot>
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        <TargetArmAds>
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            <AdsACrf>1</AdsACrf>
            <AdsANop>0</AdsANop>
            <AdsANot>0</AdsANot>
            <AdsLLst>1</AdsLLst>
            <AdsLmap>1</AdsLmap>
            <AdsLcgr>1</AdsLcgr>
            <AdsLsym>1</AdsLsym>
            <AdsLszi>1</AdsLszi>
            <AdsLtoi>1</AdsLtoi>
            <AdsLsun>1</AdsLsun>
            <AdsLven>1</AdsLven>
            <AdsLsxf>1</AdsLsxf>
            <RvctClst>0</RvctClst>
            <GenPPlst>0</GenPPlst>
            <AdsCpuType>"Cortex-M4"</AdsCpuType>
            <RvctDeviceName></RvctDeviceName>
            <mOS>0</mOS>
            <uocRom>0</uocRom>
            <uocRam>0</uocRam>
            <hadIROM>1</hadIROM>
            <hadIRAM>1</hadIRAM>
            <hadXRAM>0</hadXRAM>
            <uocXRam>0</uocXRam>
            <RvdsVP>2</RvdsVP>
            <RvdsMve>0</RvdsMve>
            <RvdsCdeCp>0</RvdsCdeCp>
            <hadIRAM2>1</hadIRAM2>
            <hadIROM2>0</hadIROM2>
            <StupSel>8</StupSel>
            <useUlib>1</useUlib>
            <EndSel>0</EndSel>
            <uLtcg>0</uLtcg>
            <nSecure>0</nSecure>
            <RoSelD>3</RoSelD>
            <RwSelD>4</RwSelD>
            <CodeSel>0</CodeSel>
            <OptFeed>0</OptFeed>
            <NoZi1>0</NoZi1>
            <NoZi2>0</NoZi2>
            <NoZi3>0</NoZi3>
            <NoZi4>0</NoZi4>
            <NoZi5>0</NoZi5>
            <Ro1Chk>0</Ro1Chk>
            <Ro2Chk>0</Ro2Chk>
            <Ro3Chk>0</Ro3Chk>
            <Ir1Chk>1</Ir1Chk>
            <Ir2Chk>0</Ir2Chk>
            <Ra1Chk>0</Ra1Chk>
            <Ra2Chk>0</Ra2Chk>
            <Ra3Chk>0</Ra3Chk>
            <Im1Chk>1</Im1Chk>
            <Im2Chk>1</Im2Chk>
            <OnChipMemories>
              <Ocm1>
                <Type>0</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </Ocm1>
              <Ocm2>
                <Type>0</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </Ocm2>
              <Ocm3>
                <Type>0</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </Ocm3>
              <Ocm4>
                <Type>0</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </Ocm4>
              <Ocm5>
                <Type>0</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </Ocm5>
              <Ocm6>
                <Type>0</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </Ocm6>
              <IRAM>
                <Type>0</Type>
                <StartAddress>0x20000000</StartAddress>
                <Size>0xc000</Size>
              </IRAM>
              <IROM>
                <Type>1</Type>
                <StartAddress>0x8000000</StartAddress>
                <Size>0x40000</Size>
              </IROM>
              <XRAM>
                <Type>0</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </XRAM>
              <OCR_RVCT1>
                <Type>1</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </OCR_RVCT1>
              <OCR_RVCT2>
                <Type>1</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </OCR_RVCT2>
              <OCR_RVCT3>
                <Type>1</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </OCR_RVCT3>
              <OCR_RVCT4>
                <Type>1</Type>
                <StartAddress>0x8000000</StartAddress>
                <Size>0x40000</Size>
              </OCR_RVCT4>
              <OCR_RVCT5>
                <Type>1</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </OCR_RVCT5>
              <OCR_RVCT6>
                <Type>0</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </OCR_RVCT6>
              <OCR_RVCT7>
                <Type>0</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </OCR_RVCT7>
              <OCR_RVCT8>
                <Type>0</Type>
                <StartAddress>0x0</StartAddress>
                <Size>0x0</Size>
              </OCR_RVCT8>
              <OCR_RVCT9>
                <Type>0</Type>
                <StartAddress>0x20000000</StartAddress>
                <Size>0xc000</Size>
              </OCR_RVCT9>
              <OCR_RVCT10>
                <Type>0</Type>
                <StartAddress>0x10000000</StartAddress>
                <Size>0x4000</Size>
              </OCR_RVCT10>
            </OnChipMemories>
            <RvctStartVector></RvctStartVector>
          </ArmAdsMisc>
          <Cads>
            <interw>1</interw>
            <Optim>2</Optim>
            <oTime>0</oTime>
            <SplitLS>0</SplitLS>
            <OneElfS>1</OneElfS>
            <Strict>0</Strict>
            <EnumInt>0</EnumInt>
            <PlainCh>0</PlainCh>
            <Ropi>0</Ropi>
            <Rwpi>0</Rwpi>
            <wLevel>3</wLevel>
            <uThumb>0</uThumb>
            <uSurpInc>0</uSurpInc>
            <uC99>1</uC99>
            <uGnu>0</uGnu>
            <useXO>0</useXO>
            <v6Lang>3</v6Lang>
            <v6LangP>3</v6LangP>
            <vShortEn>1</vShortEn>
            <vShortWch>1</vShortWch>
            <v6Lto>0</v6Lto>
            <v6WtE>0</v6WtE>
            <v6Rtti>0</v6Rtti>
            <VariousControls>
              <MiscControls></MiscControls>
              <Define>USE_HAL_DRIVER,STM32L431xx</Define>
              <Undefine></Undefine>
              <IncludePath>../Core/Inc;../Drivers/STM32L4xx_HAL_Driver/Inc;../Drivers/STM32L4xx_HAL_Driver/Inc/Legacy;../Drivers/CMSIS/Device/ST/STM32L4xx/Include;../Drivers/CMSIS/Include;../Board</IncludePath>
            </VariousControls>
          </Cads>
          <Aads>
            <interw>1</interw>
            <Ropi>0</Ropi>
            <Rwpi>0</Rwpi>
            <thumb>0</thumb>
            <SplitLS>0</SplitLS>
            <SwStkChk>0</SwStkChk>
            <NoWarn>0</NoWarn>
            <uSurpInc>0</uSurpInc>
            <useXO>0</useXO>
            <ClangAsOpt>1</ClangAsOpt>
            <VariousControls>
              <MiscControls></MiscControls>
              <Define></Define>
              <Undefine></Undefine>
              <IncludePath></IncludePath>
            </VariousControls>
          </Aads>
          <LDads>
            <umfTarg>1</umfTarg>
            <Ropi>0</Ropi>
            <Rwpi>0</Rwpi>
            <noStLib>0</noStLib>
            <RepFail>1</RepFail>
            <useFile>0</useFile>
            <TextAddressRange></TextAddressRange>
            <DataAddressRange></DataAddressRange>
            <pXoBase></pXoBase>
            <ScatterFile></ScatterFile>
            <IncludeLibs></IncludeLibs>
            <IncludeLibsPath></IncludeLibsPath>
            <Misc></Misc>
            <LinkerInputFile></LinkerInputFile>
            <DisabledWarnings></DisabledWarnings>
          </LDads>
        </TargetArmAds>
      </TargetOption>
      <Groups>
        <Group>
          <GroupName>Application/MDK-ARM</GroupName>
          <Files>
            <File>
              <FileName>startup_stm32l431xx.s</FileName>
              <FileType>2</FileType>
              <FilePath>startup_stm32l431xx.s</FilePath>
            </File>
          </Files>
        </Group>
        <Group>
          <GroupName>Application/User/Core</GroupName>
          <Files>
            <File>
              <FileName>main.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Core/Src/main.c</FilePath>
            </File>
            <File>
              <FileName>gpio.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Core/Src/gpio.c</FilePath>
            </File>
            <File>
              <FileName>adc.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Core/Src/adc.c</FilePath>
              <FileOption>
                <CommonProperty>
                  <UseCPPCompiler>2</UseCPPCompiler>
                  <RVCTCodeConst>0</RVCTCodeConst>
                  <RVCTZI>0</RVCTZI>
                  <RVCTOtherData>0</RVCTOtherData>
                  <ModuleSelection>0</ModuleSelection>
                  <IncludeInBuild>1</IncludeInBuild>
                  <AlwaysBuild>2</AlwaysBuild>
                  <GenerateAssemblyFile>2</GenerateAssemblyFile>
                  <AssembleAssemblyFile>2</AssembleAssemblyFile>
                  <PublicsOnly>2</PublicsOnly>
                  <StopOnExitCode>11</StopOnExitCode>
                  <CustomArgument></CustomArgument>
                  <IncludeLibraryModules></IncludeLibraryModules>
                  <ComprImg>1</ComprImg>
                </CommonProperty>
                <FileArmAds>
                  <Cads>
                    <interw>2</interw>
                    <Optim>0</Optim>
                    <oTime>2</oTime>
                    <SplitLS>2</SplitLS>
                    <OneElfS>2</OneElfS>
                    <Strict>2</Strict>
                    <EnumInt>2</EnumInt>
                    <PlainCh>2</PlainCh>
                    <Ropi>2</Ropi>
                    <Rwpi>2</Rwpi>
                    <wLevel>0</wLevel>
                    <uThumb>2</uThumb>
                    <uSurpInc>2</uSurpInc>
                    <uC99>2</uC99>
                    <uGnu>2</uGnu>
                    <useXO>2</useXO>
                    <v6Lang>0</v6Lang>
                    <v6LangP>0</v6LangP>
                    <vShortEn>2</vShortEn>
                    <vShortWch>2</vShortWch>
                    <v6Lto>2</v6Lto>
                    <v6WtE>2</v6WtE>
                    <v6Rtti>2</v6Rtti>
                    <VariousControls>
                      <MiscControls></MiscControls>
                      <Define></Define>
                      <Undefine></Undefine>
                      <IncludePath></IncludePath>
                    </VariousControls>
                  </Cads>
                </FileArmAds>
              </FileOption>
            </File>
            <File>
              <FileName>tim.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Core/Src/tim.c</FilePath>
              <FileOption>
                <CommonProperty>
                  <UseCPPCompiler>2</UseCPPCompiler>
                  <RVCTCodeConst>0</RVCTCodeConst>
                  <RVCTZI>0</RVCTZI>
                  <RVCTOtherData>0</RVCTOtherData>
                  <ModuleSelection>0</ModuleSelection>
                  <IncludeInBuild>1</IncludeInBuild>
                  <AlwaysBuild>2</AlwaysBuild>
                  <GenerateAssemblyFile>2</GenerateAssemblyFile>
                  <AssembleAssemblyFile>2</AssembleAssemblyFile>
                  <PublicsOnly>2</PublicsOnly>
                  <StopOnExitCode>11</StopOnExitCode>
                  <CustomArgument></CustomArgument>
                  <IncludeLibraryModules></IncludeLibraryModules>
                  <ComprImg>1</ComprImg>
                </CommonProperty>
                <FileArmAds>
                  <Cads>
                    <interw>2</interw>
                    <Optim>0</Optim>
                    <oTime>2</oTime>
                    <SplitLS>2</SplitLS>
                    <OneElfS>2</OneElfS>
                    <Strict>2</Strict>
                    <EnumInt>2</EnumInt>
                    <PlainCh>2</PlainCh>
                    <Ropi>2</Ropi>
                    <Rwpi>2</Rwpi>
                    <wLevel>0</wLevel>
                    <uThumb>2</uThumb>
                    <uSurpInc>2</uSurpInc>
                    <uC99>2</uC99>
                    <uGnu>2</uGnu>
                    <useXO>2</useXO>
                    <v6Lang>0</v6Lang>
                    <v6LangP>0</v6LangP>
                    <vShortEn>2</vShortEn>
                    <vShortWch>2</vShortWch>
                    <v6Lto>2</v6Lto>
                    <v6WtE>2</v6WtE>
                    <v6Rtti>2</v6Rtti>
                    <VariousControls>
                      <MiscControls></MiscControls>
                      <Define></Define>
                      <Undefine></Undefine>
                      <IncludePath></IncludePath>
                    </VariousControls>
                  </Cads>
                </FileArmAds>
              </FileOption>
            </File>
            <File>
              <FileName>usart.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Core/Src/usart.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_it.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Core/Src/stm32l4xx_it.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_msp.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Core/Src/stm32l4xx_hal_msp.c</FilePath>
            </File>
          </Files>
        </Group>
        <Group>
          <GroupName>Drivers/STM32L4xx_HAL_Driver</GroupName>
          <Files>
            <File>
              <FileName>stm32l4xx_hal_adc.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_adc.c</FilePath>
              <FileOption>
                <CommonProperty>
                  <UseCPPCompiler>2</UseCPPCompiler>
                  <RVCTCodeConst>0</RVCTCodeConst>
                  <RVCTZI>0</RVCTZI>
                  <RVCTOtherData>0</RVCTOtherData>
                  <ModuleSelection>0</ModuleSelection>
                  <IncludeInBuild>1</IncludeInBuild>
                  <AlwaysBuild>2</AlwaysBuild>
                  <GenerateAssemblyFile>2</GenerateAssemblyFile>
                  <AssembleAssemblyFile>2</AssembleAssemblyFile>
                  <PublicsOnly>2</PublicsOnly>
                  <StopOnExitCode>11</StopOnExitCode>
                  <CustomArgument></CustomArgument>
                  <IncludeLibraryModules></IncludeLibraryModules>
                  <ComprImg>1</ComprImg>
                </CommonProperty>
                <FileArmAds>
                  <Cads>
                    <interw>2</interw>
                    <Optim>0</Optim>
                    <oTime>2</oTime>
                    <SplitLS>2</SplitLS>
                    <OneElfS>2</OneElfS>
                    <Strict>2</Strict>
                    <EnumInt>2</EnumInt>
                    <PlainCh>2</PlainCh>
                    <Ropi>2</Ropi>
                    <Rwpi>2</Rwpi>
                    <wLevel>0</wLevel>
                    <uThumb>2</uThumb>
                    <uSurpInc>2</uSurpInc>
                    <uC99>2</uC99>
                    <uGnu>2</uGnu>
                    <useXO>2</useXO>
                    <v6Lang>0</v6Lang>
                    <v6LangP>0</v6LangP>
                    <vShortEn>2</vShortEn>
                    <vShortWch>2</vShortWch>
                    <v6Lto>2</v6Lto>
                    <v6WtE>2</v6WtE>
                    <v6Rtti>2</v6Rtti>
                    <VariousControls>
                      <MiscControls></MiscControls>
                      <Define></Define>
                      <Undefine></Undefine>
                      <IncludePath></IncludePath>
                    </VariousControls>
                  </Cads>
                </FileArmAds>
              </FileOption>
            </File>
            <File>
              <FileName>stm32l4xx_hal_adc_ex.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_adc_ex.c</FilePath>
              <FileOption>
                <CommonProperty>
                  <UseCPPCompiler>2</UseCPPCompiler>
                  <RVCTCodeConst>0</RVCTCodeConst>
                  <RVCTZI>0</RVCTZI>
                  <RVCTOtherData>0</RVCTOtherData>
                  <ModuleSelection>0</ModuleSelection>
                  <IncludeInBuild>1</IncludeInBuild>
                  <AlwaysBuild>2</AlwaysBuild>
                  <GenerateAssemblyFile>2</GenerateAssemblyFile>
                  <AssembleAssemblyFile>2</AssembleAssemblyFile>
                  <PublicsOnly>2</PublicsOnly>
                  <StopOnExitCode>11</StopOnExitCode>
                  <CustomArgument></CustomArgument>
                  <IncludeLibraryModules></IncludeLibraryModules>
                  <ComprImg>1</ComprImg>
                </CommonProperty>
                <FileArmAds>
                  <Cads>
                    <interw>2</interw>
                    <Optim>0</Optim>
                    <oTime>2</oTime>
                    <SplitLS>2</SplitLS>
                    <OneElfS>2</OneElfS>
                    <Strict>2</Strict>
                    <EnumInt>2</EnumInt>
                    <PlainCh>2</PlainCh>
                    <Ropi>2</Ropi>
                    <Rwpi>2</Rwpi>
                    <wLevel>0</wLevel>
                    <uThumb>2</uThumb>
                    <uSurpInc>2</uSurpInc>
                    <uC99>2</uC99>
                    <uGnu>2</uGnu>
                    <useXO>2</useXO>
                    <v6Lang>0</v6Lang>
                    <v6LangP>0</v6LangP>
                    <vShortEn>2</vShortEn>
                    <vShortWch>2</vShortWch>
                    <v6Lto>2</v6Lto>
                    <v6WtE>2</v6WtE>
                    <v6Rtti>2</v6Rtti>
                    <VariousControls>
                      <MiscControls></MiscControls>
                      <Define></Define>
                      <Undefine></Undefine>
                      <IncludePath></IncludePath>
                    </VariousControls>
                  </Cads>
                </FileArmAds>
              </FileOption>
            </File>
            <File>
              <FileName>stm32l4xx_hal.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_rcc.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_rcc.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_rcc_ex.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_rcc_ex.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_flash.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_flash.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_flash_ex.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_flash_ex.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_flash_ramfunc.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_flash_ramfunc.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_gpio.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_gpio.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_i2c.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_i2c.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_i2c_ex.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_i2c_ex.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_dma.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_dma.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_dma_ex.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_dma_ex.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_pwr.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pwr.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_pwr_ex.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pwr_ex.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_cortex.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_cortex.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_exti.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_exti.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_tim.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_tim.c</FilePath>
              <FileOption>
                <CommonProperty>
                  <UseCPPCompiler>2</UseCPPCompiler>
                  <RVCTCodeConst>0</RVCTCodeConst>
                  <RVCTZI>0</RVCTZI>
                  <RVCTOtherData>0</RVCTOtherData>
                  <ModuleSelection>0</ModuleSelection>
                  <IncludeInBuild>1</IncludeInBuild>
                  <AlwaysBuild>2</AlwaysBuild>
                  <GenerateAssemblyFile>2</GenerateAssemblyFile>
                  <AssembleAssemblyFile>2</AssembleAssemblyFile>
                  <PublicsOnly>2</PublicsOnly>
                  <StopOnExitCode>11</StopOnExitCode>
                  <CustomArgument></CustomArgument>
                  <IncludeLibraryModules></IncludeLibraryModules>
                  <ComprImg>1</ComprImg>
                </CommonProperty>
                <FileArmAds>
                  <Cads>
                    <interw>2</interw>
                    <Optim>0</Optim>
                    <oTime>2</oTime>
                    <SplitLS>2</SplitLS>
                    <OneElfS>2</OneElfS>
                    <Strict>2</Strict>
                    <EnumInt>2</EnumInt>
                    <PlainCh>2</PlainCh>
                    <Ropi>2</Ropi>
                    <Rwpi>2</Rwpi>
                    <wLevel>0</wLevel>
                    <uThumb>2</uThumb>
                    <uSurpInc>2</uSurpInc>
                    <uC99>2</uC99>
                    <uGnu>2</uGnu>
                    <useXO>2</useXO>
                    <v6Lang>0</v6Lang>
                    <v6LangP>0</v6LangP>
                    <vShortEn>2</vShortEn>
                    <vShortWch>2</vShortWch>
                    <v6Lto>2</v6Lto>
                    <v6WtE>2</v6WtE>
                    <v6Rtti>2</v6Rtti>
                    <VariousControls>
                      <MiscControls></MiscControls>
                      <Define></Define>
                      <Undefine></Undefine>
                      <IncludePath></IncludePath>
                    </VariousControls>
                  </Cads>
                </FileArmAds>
              </FileOption>
            </File>
            <File>
              <FileName>stm32l4xx_hal_tim_ex.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_tim_ex.c</FilePath>
              <FileOption>
                <CommonProperty>
                  <UseCPPCompiler>2</UseCPPCompiler>
                  <RVCTCodeConst>0</RVCTCodeConst>
                  <RVCTZI>0</RVCTZI>
                  <RVCTOtherData>0</RVCTOtherData>
                  <ModuleSelection>0</ModuleSelection>
                  <IncludeInBuild>1</IncludeInBuild>
                  <AlwaysBuild>2</AlwaysBuild>
                  <GenerateAssemblyFile>2</GenerateAssemblyFile>
                  <AssembleAssemblyFile>2</AssembleAssemblyFile>
                  <PublicsOnly>2</PublicsOnly>
                  <StopOnExitCode>11</StopOnExitCode>
                  <CustomArgument></CustomArgument>
                  <IncludeLibraryModules></IncludeLibraryModules>
                  <ComprImg>1</ComprImg>
                </CommonProperty>
                <FileArmAds>
                  <Cads>
                    <interw>2</interw>
                    <Optim>0</Optim>
                    <oTime>2</oTime>
                    <SplitLS>2</SplitLS>
                    <OneElfS>2</OneElfS>
                    <Strict>2</Strict>
                    <EnumInt>2</EnumInt>
                    <PlainCh>2</PlainCh>
                    <Ropi>2</Ropi>
                    <Rwpi>2</Rwpi>
                    <wLevel>0</wLevel>
                    <uThumb>2</uThumb>
                    <uSurpInc>2</uSurpInc>
                    <uC99>2</uC99>
                    <uGnu>2</uGnu>
                    <useXO>2</useXO>
                    <v6Lang>0</v6Lang>
                    <v6LangP>0</v6LangP>
                    <vShortEn>2</vShortEn>
                    <vShortWch>2</vShortWch>
                    <v6Lto>2</v6Lto>
                    <v6WtE>2</v6WtE>
                    <v6Rtti>2</v6Rtti>
                    <VariousControls>
                      <MiscControls></MiscControls>
                      <Define></Define>
                      <Undefine></Undefine>
                      <IncludePath></IncludePath>
                    </VariousControls>
                  </Cads>
                </FileArmAds>
              </FileOption>
            </File>
            <File>
              <FileName>stm32l4xx_hal_uart.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_uart.c</FilePath>
            </File>
            <File>
              <FileName>stm32l4xx_hal_uart_ex.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_uart_ex.c</FilePath>
            </File>
          </Files>
        </Group>
        <Group>
          <GroupName>Drivers/CMSIS</GroupName>
          <Files>
            <File>
              <FileName>system_stm32l4xx.c</FileName>
              <FileType>1</FileType>
              <FilePath>../Core/Src/system_stm32l4xx.c</FilePath>
            </File>
          </Files>
        </Group>
        <Group>
          <GroupName>Board</GroupName>
          <Files>
            <File>
              <FileName>miscdev.c</FileName>
              <FileType>1</FileType>
              <FilePath>..\Board\miscdev.c</FilePath>
            </File>
            <File>
              <FileName>buzzer.c</FileName>
              <FileType>1</FileType>
              <FilePath>..\Board\buzzer.c</FilePath>
            </File>
            <File>
              <FileName>ds18b20.c</FileName>
              <FileType>1</FileType>
              <FilePath>..\Board\ds18b20.c</FilePath>
            </File>
            <File>
              <FileName>eeprom.c</FileName>
              <FileType>1</FileType>
              <FilePath>..\Board\eeprom.c</FilePath>
            </File>
            <File>
              <FileName>i2c_bitbang.c</FileName>
              <FileType>1</FileType>
              <FilePath>..\Board\i2c_bitbang.c</FilePath>
            </File>
            <File>
              <FileName>isl1208.c</FileName>
              <FileType>1</FileType>
              <FilePath>..\Board\isl1208.c</FilePath>
            </File>
            <File>
              <FileName>oled_drv.c</FileName>
              <FileType>1</FileType>
              <FilePath>..\Board\oled_drv.c</FilePath>
            </File>
            <File>
              <FileName>oled_font.c</FileName>
              <FileType>1</FileType>
              <FilePath>..\Board\oled_font.c</FilePath>
            </File>
            <File>
              <FileName>sht20.c</FileName>
              <FileType>1</FileType>
              <FilePath>..\Board\sht20.c</FilePath>
            </File>
          </Files>
        </Group>
        <Group>
          <GroupName>::CMSIS</GroupName>
        </Group>
      </Groups>
    </Target>
  </Targets>

  <RTE>
    <apis/>
    <components>
      <component Cclass="CMSIS" Cgroup="CORE" Cvendor="ARM" Cversion="6.2.0" condition="ARMv6_7_8-M Device" ymlID="CMSIS:CORE">
        <package name="CMSIS" schemaVersion="1.7.53" url="https://www.keil.com/pack/" vendor="ARM" version="6.3.0"/>
        <targetInfos>
          <targetInfo name="ISKBoard"/>
        </targetInfos>
      </component>
    </components>
    <files/>
  </RTE>

</Project>

 ex2.i2c-bitbang/do_clean.bat

New file
@@ -0,0 +1,39 @@
@echo off
setlocal

cd /d "%~dp0"

REM ===== Clean Core (keep main.c) =====
if exist "Core\Src\main.c" (
    copy /y "Core\Src\main.c" "main.c" >nul
    rmdir /s /q "Core" 2>nul
    mkdir "Core\Src" 2>nul
    copy /y "main.c" "Core\Src\main.c" >nul
    del /f /q "main.c"
)

REM ===== Clean artifacts =====
call :del_file .mxproject
call :del_file .cproject
call :del_file .project
call :del_file .clangd
call :del_file *.json
call :del_file *.ld
call :del_file *.s

call :del_dir .settings
call :del_dir Drivers
call :del_dir Debug
call :del_dir Release
call :del_dir build
call :del_dir cmake

exit /b

:del_file
if exist "%~1" del /f /q "%~1"
exit /b

:del_dir
if exist "%~1\" rmdir /s /q "%~1"
exit /b