/* Reference: https://blog.csdn.net/Lennon8_8/article/details/108980808
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* ws2812b.c
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*
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* Created on: 2023年2月13日
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* Author: Think
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*/
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#include <string.h>
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#include <stdint.h>
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#include "ws2812b.h"
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#include "miscdev.h"
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static color_t g_ColorPanel[WS2812_NUM];
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typedef struct ws_gpio_s
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{
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GPIO_TypeDef *group;
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uint16_t pin;
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} ws_gpio_t;
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static ws_gpio_t ws_gpio = /* IO pin connected to PC2 */
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{
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.group = GPIOC,
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.pin = GPIO_PIN_2,
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};
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#define ws_setpin(x) if(!x) ws_gpio.group->BRR=ws_gpio.pin; else ws_gpio.group->BSRR=ws_gpio.pin
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/*
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* 1 NOP = 1/80MHz = 12.5ns => 100ns = 8 * NOP
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*
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* */
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#define delay_200ns() { __NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP(); \
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__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP();__NOP(); }
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void ws2812b_init(void)
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{
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GPIO_InitTypeDef GPIO_InitStruct = {0};
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GPIO_InitStruct.Pin = ws_gpio.pin;
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GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
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HAL_GPIO_Init(ws_gpio.group, &GPIO_InitStruct);
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ws2812b_reset();
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return ;
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}
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static inline void ws2812b_WriteByte(uint8_t byte)
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{
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int i;
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for(i=0; i<8; i++)
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{
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if(byte & 0x80)
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{
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/* Sequence Send 1: T1H: 580ns~1.6us T1L: 200ns~420ns:
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*
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* +--------------+ +
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* |<- T1H ->|<- T1L ->|
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* | +---------+
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*/
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ws_setpin(1); // T1H
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delay_us(1);
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ws_setpin(0); // T1L
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delay_200ns(); //200ns test okay
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}
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else
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{
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/* Sequence Send 0: T0H: 220ns~380ns T0L: 580ns~1.6ns:
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*
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* +---------+ +
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* |<- T0H ->|<- T0L ->|
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* | +--------------+
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*/
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ws_setpin(1); // T0H
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delay_200ns(); //200ns test okay
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ws_setpin(0); // T0L
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delay_us(1);
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}
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byte<<=1;
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}
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return ;
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}
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void ws2812b_reset(void)
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{
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/* Sequence Reset: Treset >280us:
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*
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* + +
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* |<- Treset ->|
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* +--------------+
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*/
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ws_setpin(0);
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delay_us(300);
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memset(g_ColorPanel, 0, sizeof(g_ColorPanel));
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return ;
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}
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static inline void ws2812b_SendColor(color_t color)
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{
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ws2812b_WriteByte(color.pixel.green);
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ws2812b_WriteByte(color.pixel.red);
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ws2812b_WriteByte(color.pixel.blue);
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return ;
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}
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static inline void ws2812b_Refresh(void)
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{
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int i;
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for(i=0; i<WS2812_NUM; i++)
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{
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ws2812b_SendColor(g_ColorPanel[i]);
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}
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return ;
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}
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static inline int ws2812b_SetPixel(int which, color_t color)
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{
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if( which<0 || which>=WS2812_NUM )
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return -1;
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g_ColorPanel[which].pixel.red = color.pixel.red;
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g_ColorPanel[which].pixel.green = color.pixel.green;
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g_ColorPanel[which].pixel.blue = color.pixel.blue;
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return 0;
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}
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int ws2812b_turn(int which, color_t color)
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{
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if( which<0 || which>=WS2812_NUM )
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return -1;
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ws2812b_SetPixel(which, color);
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ws2812b_Refresh();
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return 0;
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}
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void ws2812b_blink(void)
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{
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int c, i;
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color_t colors[4] = {[0].data=PIXEL_B, [1].data=PIXEL_R, [2].data=PIXEL_G, [3].data=PIXEL_W};
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color_t color_off = {.data = PIXEL_OFF};
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for(c=0; c<4; c++) /* color */
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{
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for(i=0; i<WS2812_NUM; i++)
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{
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ws2812b_turn(i, colors[c]);
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HAL_Delay(200);
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ws2812b_turn(i, (color_t)color_off);
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HAL_Delay(200);
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}
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}
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}
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