stm32做实时时间代码
时间: 2023-09-02 10:15:27 浏览: 45
以下是基于STM32 HAL库的RTC模块初始化和读取时间的代码示例:
```c
#include "stm32f4xx_hal.h"
#include "stm32f4xx_hal_rtc.h"
RTC_HandleTypeDef hrtc;
void RTC_Init(void) {
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
//使能LSE时钟
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
//出错处理
}
//配置RTC时钟源
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) {
//出错处理
}
//初始化RTC
hrtc.Instance = RTC;
hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
hrtc.Init.AsynchPrediv = 127;
hrtc.Init.SynchPrediv = 255;
hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
if (HAL_RTC_Init(&hrtc) != HAL_OK) {
//出错处理
}
//使能RTC秒中断
RTC_TimeTypeDef sTime;
sTime.Hours = 0;
sTime.Minutes = 0;
sTime.Seconds = 0;
sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
sTime.StoreOperation = RTC_STOREOPERATION_RESET;
if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN) != HAL_OK) {
//出错处理
}
HAL_NVIC_SetPriority(RTC_Alarm_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(RTC_Alarm_IRQn);
__HAL_RTC_ALARM_ENABLE_IT(&hrtc, RTC_IT_ALRA);
}
void RTC_GetTime(uint32_t *timestamp) {
RTC_DateTypeDef Date;
RTC_TimeTypeDef Time;
//读取日期和时间
HAL_RTC_GetTime(&hrtc, &Time, RTC_FORMAT_BIN);
HAL_RTC_GetDate(&hrtc, &Date, RTC_FORMAT_BIN);
//计算时间戳
uint32_t year = Date.Year + 2000;
uint32_t month = Date.Month;
uint32_t day = Date.Date;
uint32_t hour = Time.Hours;
uint32_t minute = Time.Minutes;
uint32_t second = Time.Seconds;
uint32_t days = 0;
for (uint32_t i = 1970; i < year; i++) {
if ((i % 4 == 0 && i % 100 != 0) || (i % 400 == 0)) {
days += 366;
} else {
days += 365;
}
}
for (uint32_t i = 1; i < month; i++) {
switch (i) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
days += 31;
break;
case 4:
case 6:
case 9:
case 11:
days += 30;
break;
case 2:
if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {
days += 29;
} else {
days += 28;
}
break;
}
}
days += day - 1;
uint32_t seconds = days * 86400 + hour * 3600 + minute * 60 + second;
*timestamp = seconds;
}
void RTC_Alarm_IRQHandler(void) {
HAL_RTC_AlarmIRQHandler(&hrtc);
}
```
以上代码实现了RTC模块的初始化和读取时间戳功能,其中RTC_GetTime函数可以将当前时间转换为时间戳,方便进行时间计算和比较。需要注意的是,读取时间时需要先读取日期和时间,然后计算出时间戳。另外,RTC模块的秒中断需要在中断服务函数中进行处理,例如在RTC_Alarm_IRQHandler函数中调用HAL_RTC_AlarmIRQHandler函数。