initial commit

first build, test

Core/Src/soft_rtc.c

@@ -0,0 +1,74 @@
+/*
+ * rtc.c
+ *
+ *  Created on: Jul 22, 2024
+ *      Author: colorbass
+ */
+
+#include <soft_rtc.h>
+#include <stdint.h>
+#include <time.h>
+
+uint32_t GBT_time_offset; //current time = offset+HAL_GetTick()/1000;
+uint8_t tmp_time[4];
+uint8_t tmp_time32;
+
+uint32_t get_Current_Time(){
+	return GBT_time_offset + (HAL_GetTick()/1000);
+}
+
+void set_Time(uint32_t unix_time){
+	if(unix_time <= (HAL_GetTick()/1000)) return; //invalid time
+	GBT_time_offset = unix_time - (HAL_GetTick()/1000);
+}
+
+uint8_t to_bcd(int value) {
+    return ((value / 10) << 4) | (value % 10);
+}
+
+void unix_to_bcd(uint32_t unix_time, uint8_t *time) {
+    struct tm *tm_info;
+    time_t raw_time = (time_t)unix_time;
+    tm_info = gmtime(&raw_time);
+
+    time[0] = to_bcd(tm_info->tm_sec);
+    time[1] = to_bcd(tm_info->tm_min);
+    time[2] = to_bcd(tm_info->tm_hour);
+    time[3] = to_bcd(tm_info->tm_mday);
+    time[4] = to_bcd(tm_info->tm_mon + 1); // tm_mon is 0-11
+    time[5] = to_bcd((tm_info->tm_year + 1900) % 100); // Year in 2 digits
+    time[6] = to_bcd((tm_info->tm_year + 1900) / 100); // Century in 2 digits
+}
+
+void writeTimeReg(uint8_t reg_number, uint8_t value){
+	tmp_time[reg_number] = value;
+	if(reg_number == 3) set_Time((tmp_time[0])+(tmp_time[1]<<8)+(tmp_time[2]<<16)+(tmp_time[3]<<24));
+};
+
+uint8_t getTimeReg(uint8_t reg_number){
+	if(reg_number == 0){
+		tmp_time32 = get_Current_Time();
+		return tmp_time32 & 0xFF;
+	}else if(reg_number == 1){
+		return (tmp_time32>>8) & 0xFF;
+	}else if(reg_number == 2){
+		return (tmp_time32>>16) & 0xFF;
+	}else if(reg_number == 3){
+		return (tmp_time32>>24) & 0xFF;
+	}else{
+		return 0x00;
+	}
+};
+//int main() {
+//    uint32_t unix_time = 1672531199; // Example Unix timestamp
+//    uint8_t time[8];
+//
+//    unix_to_bcd(unix_time, time);
+//
+//    // Print the BCD values for verification
+//    for (int i = 0; i < 8; i++) {
+//        printf("time[%d]: %02X\n", i, time[i]);
+//    }
+//
+//    return 0;
+//}