From 1105733dc07562240bd061a1d8b0869c8c596805 Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Thu, 09 Oct 2025 00:41:09 +0800
Subject: [PATCH] ISL1208 RTC示例程序
---
Core/Src/board/isl1208.c | 343 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 343 insertions(+), 0 deletions(-)
diff --git a/Core/Src/board/isl1208.c b/Core/Src/board/isl1208.c
new file mode 100644
index 0000000..054a92a
--- /dev/null
+++ b/Core/Src/board/isl1208.c
@@ -0,0 +1,343 @@
+/**********************************************************************
+ * Copyright: (C)2024 LingYun IoT System Studio
+ * Author: GuoWenxue<guowenxue@gmail.com>
+ *
+ * Description: ISL1208 RTC driver on ISKBoard
+ *
+ * ChangeLog:
+ * Version Date Author Description
+ * V1.0.0 2024.08.29 GuoWenxue Release initial version
+ *
+ ***********************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include "isl1208.h"
+#include "i2c_bitbang.h"
+
+//#define CONFIG_DEBUG_RTC /* Enable ISL1208 RTC debug */
+
+#define ISL1208_CHIPADDR 0x6F /* ISL1208 7-Bits Chip address */
+
+
+#ifdef CONFIG_DEBUG_RTC
+#define rtc_print(format,args...) printf(format, ##args)
+#else
+#define rtc_print(format,args...) do{} while(0)
+#endif
+
+
+/*+--------------------------------------+
+ *| RTC Chipset ISL1208 Register |
+ *+--------------------------------------+*/
+
+/* rtc section */
+#define ISL1208_REG_SC 0x00
+#define ISL1208_REG_MN 0x01
+#define ISL1208_REG_HR 0x02
+#define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */
+#define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */
+#define ISL1208_REG_DT 0x03
+#define ISL1208_REG_MO 0x04
+#define ISL1208_REG_YR 0x05
+#define ISL1208_REG_DW 0x06
+#define ISL1208_RTC_SECTION_LEN 7 /* RTC Section register */
+#define REGS_RTC_SR_LEN 8 /* RTC Section and status register */
+
+/* control/status section */
+#define ISL1208_REG_SR 0x07
+#define ISL1208_REG_SR_ARST (1<<7) /* auto reset */
+#define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */
+#define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */
+#define ISL1208_REG_SR_EVT (1<<3) /* event */
+#define ISL1208_REG_SR_ALM (1<<2) /* alarm */
+#define ISL1208_REG_SR_BAT (1<<1) /* battery */
+#define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */
+#define ISL1208_REG_INT 0x08
+#define ISL1208_REG_INT_ALME (1<<6) /* alarm enable */
+#define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */
+#define ISL1219_REG_EV 0x09
+#define ISL1219_REG_EV_EVEN (1<<4) /* event detection enable */
+#define ISL1219_REG_EV_EVIENB (1<<7) /* event in pull-up disable */
+#define ISL1208_REG_ATR 0x0a
+#define ISL1208_REG_DTR 0x0b
+
+/* alarm section */
+#define ISL1208_REG_SCA 0x0c
+#define ISL1208_REG_MNA 0x0d
+#define ISL1208_REG_HRA 0x0e
+#define ISL1208_REG_DTA 0x0f
+#define ISL1208_REG_MOA 0x10
+#define ISL1208_REG_DWA 0x11
+#define ISL1208_ALARM_SECTION_LEN 6
+
+/* user section */
+#define ISL1208_REG_USR1 0x12
+#define ISL1208_REG_USR2 0x13
+#define ISL1208_USR_SECTION_LEN 2
+
+#define ISL1208_REGS_MAX 0x13
+
+const char *weekday[7]={"Sun.","Mon.","Tue.","Wed.","Thu.","Fri.","Sat." };
+
+
+/*
+ *+----------------------------------+
+ *| ISL1208 Low level API |
+ *+----------------------------------+
+ */
+
+static int isl1208_i2c_read_regs(uint8_t regaddr, uint8_t *regs, uint8_t len)
+{
+ uint8_t i;
+ int rv = 0;
+ uint8_t byte;
+ uint8_t ack;
+
+ if( !regs || len<=0 )
+ {
+ rtc_print("ISL1208: Invalid input arguments\r\n");
+ return -1;
+ }
+
+ I2C_StartCondition();
+
+ if( (rv=I2C_SendAddress(I2C_WR)) < 0 )
+ {
+ rtc_print("ISL1208: Send chipset address[W] failure: rv=0x%02x\r\n", rv);
+ goto OUT;
+ }
+
+ if( (rv=I2C_WriteByte(regaddr)) < 0 )
+ {
+ rtc_print("ISL1208: Set register[0x%02x] failure: rv=0x%02x\r\n", regaddr, rv);
+ goto OUT;
+ }
+
+ I2C_StartCondition();
+
+ if( (rv=I2C_SendAddress( I2C_RD )) < 0 )
+ {
+ rtc_print("ISL1208: Send chipset address[W] failure: rv=0x%02x\r\n", rv);
+ goto OUT;
+ }
+
+ for (i=0; i<len; i++)
+ {
+ if( i == (len-1) )
+ ack = ACK_NONE;
+ else
+ ack = ACK;
+
+ if( (rv=I2C_ReadByte(&byte, ack, I2C_CLK_STRETCH_TIMEOUT)) < 0 )
+ {
+ rtc_print("ISL1208: Read register data failure: rv=0x%02x\r\n", rv);
+ goto OUT;
+ }
+
+ regs[i] = byte;
+ }
+
+OUT:
+ I2C_StopCondition();
+ return rv;
+}
+
+static int isl1208_i2c_write_regs(uint8_t regaddr, uint8_t *regs, uint8_t len)
+{
+ uint8_t i = 0;
+ int rv = 0;
+
+ I2C_StartCondition();
+
+ if( (rv=I2C_SendAddress(I2C_WR)) < 0 )
+ {
+ rtc_print("ISL1208: Send chipset address[W] failure: rv=0x%02x\r\n", rv);
+ goto OUT;
+ }
+
+ if( (rv=I2C_WriteByte(regaddr)) < 0 )
+ {
+ rtc_print("ISL1208: Set register[0x%02x] failure: rv=0x%02x\r\n", regaddr, rv);
+ goto OUT;
+ }
+
+ for (i=0; i<len; i++)
+ {
+ if( (rv=I2C_WriteByte(regs[i])) < 0 )
+ {
+ rtc_print("ISL1208: Write register data failure: rv=0x%02x\r\n", rv);
+ goto OUT;
+ }
+ }
+
+ rv = 0;
+
+OUT:
+ I2C_StopCondition();
+ return rv;
+}
+
+
+#define bcd2bin(x) (((x) & 0x0f) + ((x) >> 4) * 10)
+#define bin2bcd(x) ((((x) / 10) << 4) + (x) % 10)
+
+int set_hwclock(hwclock_t tm)
+{
+ int rv;
+ uint8_t regs[ISL1208_RTC_SECTION_LEN] = { 0, };
+ uint8_t sr;
+
+ regs[ISL1208_REG_SC] = bin2bcd(tm.tm_sec);
+ regs[ISL1208_REG_MN] = bin2bcd(tm.tm_min);
+ regs[ISL1208_REG_HR] = bin2bcd(tm.tm_hour) | ISL1208_REG_HR_MIL;
+
+ regs[ISL1208_REG_DT] = bin2bcd(tm.tm_mday);
+ regs[ISL1208_REG_MO] = bin2bcd(tm.tm_mon);
+ regs[ISL1208_REG_YR] = bin2bcd(tm.tm_year - 2000);
+ //regs[ISL1208_REG_DW] = bin2bcd(tm.tm_wday & 7);
+
+ if( i2c_lock(ISL1208_CHIPADDR) < 0 )
+ {
+ rtc_print("ISL1208: Lock I2C bus failure!\r\n");
+ return -2;
+ }
+
+ rv = isl1208_i2c_read_regs(ISL1208_REG_SR, &sr, 1);
+ if( rv < 0 )
+ {
+ rtc_print("ISL1208: read Status Register failure, rv=%d!\r\n", rv);
+ rv = -3;
+ goto OUT;
+ }
+ sr |= ISL1208_REG_SR_WRTC;
+ rv = isl1208_i2c_write_regs(ISL1208_REG_SR, &sr, 1);
+ if( rv < 0 )
+ {
+ rtc_print("ISL1208: Set Status Register WRTC failure, rv=%d!\r\n", rv);
+ rv = -4;
+ goto OUT;
+ }
+
+ rv=isl1208_i2c_write_regs(ISL1208_REG_SC, regs, ISL1208_RTC_SECTION_LEN);
+ if(rv < 0 )
+ {
+ rtc_print("ISL1208: Set RTC section registeres failure, rv=%d!\r\n", rv);
+ rv = -5;
+ goto OUT;
+ }
+
+ sr &= (~ISL1208_REG_SR_WRTC);
+ rv = isl1208_i2c_write_regs(ISL1208_REG_SR, &sr, 1);
+ if( rv < 0 )
+ {
+ rtc_print("ISL1208: Clear Status Register WRTC failure, rv=%d!\r\n", rv);
+ rv = -6;
+ goto OUT;
+ }
+
+OUT:
+ i2c_free();
+ return rv;
+}
+
+int get_hwclock(hwclock_t *tm)
+{
+ int rv = 0;
+ uint8_t regs[REGS_RTC_SR_LEN] = { 0, };
+
+ if( !tm )
+ {
+ rtc_print("ISL1208: Invalid input arugments!\r\n");
+ return -1;
+ }
+
+ if( i2c_lock(ISL1208_CHIPADDR) < 0 )
+ {
+ rtc_print("ISL1208: Initial I2C bus failure!\r\n");
+ return -2;
+ }
+
+ rv = isl1208_i2c_read_regs(ISL1208_REG_SC, regs, REGS_RTC_SR_LEN);
+ if (rv < 0)
+ {
+ rtc_print("ISL1208: read RTC_SECTION and SR registeres failure, rv=%d!\r\n", rv);
+ rv = -3;
+ goto OUT;
+ }
+
+ if( regs[ISL1208_REG_SR] & ISL1208_REG_SR_RTCF )
+ {
+ rtc_print("ISL1208: Initialize RTC time after power failure!\r\n");
+ rv = -4;
+ goto OUT;
+ }
+
+ tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]);
+ tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]);
+
+ {
+ const uint8_t _hr = regs[ISL1208_REG_HR];
+
+ if (_hr & ISL1208_REG_HR_MIL) /* 24H */
+ {
+ tm->tm_hour = bcd2bin(_hr & 0x3f);
+ }
+ else /* 12H */
+ {
+ tm->tm_hour = bcd2bin(_hr & 0x1f);
+ if (_hr & ISL1208_REG_HR_PM)
+ tm->tm_hour += 12;
+ }
+ }
+
+ tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]);
+ tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]);
+ tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 2000;
+ tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]);
+
+OUT:
+ i2c_free();
+ return rv;
+}
+
+int set_rtctime(char *time)
+{
+ hwclock_t tm;
+
+ if( 6 != sscanf(time, "%d-%d-%d %d:%d:%d",
+ &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec))
+ {
+ return -1;
+ }
+
+ set_hwclock(tm);
+
+ return 0;
+}
+
+int get_rtctime(char *buf, int size)
+{
+ hwclock_t tm;
+
+ memset(buf, 0, size);
+
+ if( get_hwclock(&tm) < 0 )
+ return -1;
+
+ snprintf(buf, size, "%04d-%02d-%02d %02d:%02d:%02d\r\n",
+ tm.tm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
+
+ return 0;
+}
+
+void print_rtctime(void)
+{
+ hwclock_t tm;
+
+ if( get_hwclock(&tm) < 0 )
+ return ;
+
+ printf("%04d-%02d-%02d %02d:%02d:%02d\r\n",
+ tm.tm_year, tm.tm_mon, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
+}
--
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