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main.c
#include "stm32f4xx.h"
#include "delay.h"
#include "MyRTC.h"
#include "LED.h"
uint8_t TIME[6];
uint8_t Alarm;
uint8_t Status;
int main(void)
{
LED_Init();
MyRTC_Init();//初始化RTC时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR,ENABLE);//使能PWR
MyRTC_SetAlarm();//设置闹钟
while(1)
{
MyRTC_GetCurrentTimeAndDate(TIME);// 读取并显示当前时间和日期
Alarm = MyRTC_GetAlarm();//获取闹钟的时间
Status = RTC_GetFlagStatus(RTC_FLAG_ALRAF);//查看闹钟标志位
PWR_EnterSTANDBYMode();//待机模式
}
}
MyRTC.c
#include "stm32f4xx.h" // Device header
#include "MyRTC.h"
#include "LED.h"
void MyRTC_Init(void)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR,ENABLE);//使能PWR
PWR_BackupAccessCmd(ENABLE); //使能后备寄存器访问
RCC_LSEConfig(RCC_LSE_ON);//开启外部低速时钟
while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) != SET);//等待外部低速时钟准备完成
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);//选择RTC的时钟源
RCC_RTCCLKCmd(ENABLE);
RTC_WaitForSynchro();
if(RTC_ReadBackupRegister(RTC_BKP_DR1) != 0xA1A1)//通过读取BKP寄存器可防止重复的初始化
{ //，在主电源和备用电源都断电后重新上电，就会重新初始化RTC
RTC_InitTypeDef RTC_InitStructure;
RTC_InitStructure.RTC_AsynchPrediv = 127; // 异步预分频器值，设置 RTC_PRER 寄存器的 PREDIV_A 相关位
RTC_InitStructure.RTC_SynchPrediv = 255; // 同步预分频器值，设置 RTC_PRER 寄存器的 PREDIV_S 相关位
//为了得到1 Hz的RTC时钟，通常设置异步预分频器为127，同步预分频器为255。
RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;//设置 RTC 的时间格式,
RTC_Init(&RTC_InitStructure);
//RTC_Init不需要调用RTC_EnterInitMode。底层会调用。但是设置具体的时间和日期时，仍需手动调用初始化模式。
MyRTC_SetTime(12, 34, 56);// 设置时间为12:34:56
MyRTC_SetDate(24, 6, 30, 7);// 设置日期为2024-06-30（星期日）
RTC_WriteBackupRegister(RTC_BKP_DR1,0xA1A1);
}
}
void MyRTC_SetTime(uint8_t hour, uint8_t minute, uint8_t second)
{
RTC_TimeTypeDef RTC_TimeStructure;
RTC_TimeStructure.RTC_H12 = RTC_H12_AM;
RTC_TimeStructure.RTC_Hours = hour;
RTC_TimeStructure.RTC_Minutes = minute;
RTC_TimeStructure.RTC_Seconds = second;
RTC_EnterInitMode();// 进入初始化模式
RTC_SetTime(RTC_Format_BIN,&RTC_TimeStructure);
RTC_ExitInitMode();// 退出初始化模式
}
void MyRTC_SetDate(uint8_t year, uint8_t month, uint8_t day, uint8_t weekday)
{
RTC_DateTypeDef RTC_DateStructure;
RTC_DateStructure.RTC_Date = day;
RTC_DateStructure.RTC_Month = month;
RTC_DateStructure.RTC_WeekDay = weekday;
RTC_DateStructure.RTC_Year = year;
RTC_EnterInitMode();
RTC_SetDate(RTC_Format_BIN,&RTC_DateStructure);
RTC_ExitInitMode();
}
void MyRTC_GetCurrentTimeAndDate(uint8_t *TIME)
{
RTC_TimeTypeDef RTC_TimeStructure;
RTC_DateTypeDef RTC_DateStructure;
RTC_GetTime(RTC_Format_BIN, &RTC_TimeStructure); // 读取当前时间
RTC_GetDate(RTC_Format_BIN, &RTC_DateStructure);// 读取当前日期
TIME[0] = RTC_DateStructure.RTC_Year;
TIME[1] = RTC_DateStructure.RTC_Month;
TIME[2] = RTC_DateStructure.RTC_Date;
TIME[3] = RTC_TimeStructure.RTC_Hours;
TIME[4] = RTC_TimeStructure.RTC_Minutes;
TIME[5] = RTC_TimeStructure.RTC_Seconds;
}
void MyRTC_SetAlarm(void)
{
RTC_TimeTypeDef RTC_TimeStructure;
RTC_GetTime(RTC_Format_BIN, &RTC_TimeStructure);
RTC_AlarmCmd(RTC_Alarm_A,DISABLE);
RTC_AlarmTypeDef RTC_AlarmStructure;
RTC_AlarmStructure.RTC_AlarmTime.RTC_H12 = RTC_H12_AM;
RTC_AlarmStructure.RTC_AlarmTime.RTC_Hours = 0;
RTC_AlarmStructure.RTC_AlarmTime.RTC_Minutes = 0;
RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds = (RTC_TimeStructure.RTC_Seconds+10)%60;
RTC_AlarmStructure.RTC_AlarmDateWeekDay = 0x31; // 任意日期
RTC_AlarmStructure.RTC_AlarmDateWeekDaySel = RTC_AlarmDateWeekDaySel_Date;
RTC_AlarmStructure.RTC_AlarmMask = RTC_AlarmMask_DateWeekDay | RTC_AlarmMask_Hours | RTC_AlarmMask_Minutes;//使用掩码忽略日期、小时和分钟部分，只关注秒部分。
RTC_SetAlarm(RTC_Format_BIN,RTC_Alarm_A,&RTC_AlarmStructure);
RTC_AlarmCmd(RTC_Alarm_A,ENABLE);
//RTC_ClearFlag(RTC_FLAG_ALRAF);// 清除闹钟标志
RTC_ITConfig(RTC_IT_ALRA, ENABLE);// 使能闹钟中断
EXTI_InitTypeDef EXTI_InitStructure;
EXTI_InitStructure.EXTI_Line = EXTI_Line17; // Line 17 connected to RTC Alarm
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; // Trigger on rising edge
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = RTC_Alarm_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F; // Set a low priority
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
uint8_t MyRTC_GetAlarm(void)
{
RTC_AlarmTypeDef RTC_AlarmStructure;
RTC_GetAlarm(RTC_Format_BIN,RTC_Alarm_A,&RTC_AlarmStructure);
return RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds;
}
void RTC_Alarm_IRQHandler(void)
{
if (RTC_GetITStatus(RTC_IT_ALRA) != RESET)
{
RTC_ClearITPendingBit(RTC_IT_ALRA);
EXTI_ClearITPendingBit(EXTI_Line17); // 清除EXTI线路17（连接到RTC闹钟）的中断挂起位
LED1_Turn();
}
}
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发表于 2024-7-3 22:10:21
楼主
发表于 2024-7-4 09:36:37
