f3 RTC 例子

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这两天在搞STM32F303RE的RTC，遇到点问题，求各位大神帮忙看看。情况是这样的：

RTC中设置当前时间为 15年05月31日，星期日(7)，15:50:40，

1、开weakup中断，每秒钟来一次中断，用串口输出当前时间值；

2、设置闹钟A在星期日 15:50:45，并开中断，这样程序运行5秒之后就会产生闹钟A中断，在中断中输出”闹钟A“和当前时间

问题来了，当单独开启weakup中断、程序运行正常，如图1，单独开启闹钟A中断，程序运行也正常，如图2。但是如果同时开启两个中断，那么从输出结果中只能看到weakup的输出，没有闹钟A的输出，结果和图1一样，查看程序运行，发现根本没有进闹钟A的中断。

中断设置中已经设置闹钟中断优先级高于weakup中断，把weakup改为3秒，这样就不会同时发生中断，但是结果还是一样，只能进入一个中断。请问这样的问题是为什么？要怎样改？

（问题已经解决）

还有个问题，我设置的是50分45秒产生闹钟中断，但是从打印信息来看才44秒，这又是因为什么？是获取当前时间有延迟吗？

问题已经解决，暂时不知道闹钟不准是什么原因，后来测试又是准确了的

经过更改后运行结果如下：

经过更改后贴上完整的程序和代码附件。

RTC看起来很简单的基本功能，但是使用起来感觉还是蛮复杂的，贴上自己总结的大概使用步骤：

1、打开PWR时钟和Backup区数据访问

2、若使用外部低速时钟(LSE)，打开LSE并等待起振

3、选择和打开RTC时钟，等待时钟同步

4、配置时间格式，分频系数等

5、根据需要配置时钟，日期，闹钟，唤醒，输出，时间戳，备份寄存器等模块

6、根据需要配置和打开中断，其中： RTC Alarm ——EXTI line 17 ；

RTC tamper and Timestamps——EXTI line 19 ； RTC wakeup——EXTI line 20

写得不太详细，具体请参考官方库STM32F3函数说明手册和参考手册

相关的程序如下，基本按上面的步骤：

void RTC_Config(void)
{
RTC_TimeTypeDef RTC_TimeStructure;
RTC_DateTypeDef RTC_DateStructure;
RTC_InitTypeDef RTC_InitStructure;
RTC_AlarmTypeDef RTC_AlarmStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR,ENABLE);
PWR_BackupAccessCmd(ENABLE);
RCC_BackupResetCmd(ENABLE);
RCC_BackupResetCmd(DISABLE);
RCC_LSEConfig(RCC_LSE_ON);
while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET);
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
RCC_RTCCLKCmd(ENABLE);
RTC_WaitForSynchro();
RTC_InitStructure.RTC_HourFormat=RTC_HourFormat_24;
RTC_InitStructure.RTC_AsynchPrediv=0x7F;
RTC_InitStructure.RTC_SynchPrediv=0xFF;
RTC_Init(&RTC_InitStructure);
RTC_DateStructure.RTC_Date=31; // 15,05,31
RTC_DateStructure.RTC_Month=RTC_Month_May;
RTC_DateStructure.RTC_Year=15;
RTC_DateStructure.RTC_WeekDay=RTC_Weekday_Sunday;
RTC_SetDate(RTC_Format_BIN,&RTC_DateStructure);
RTC_TimeStructure.RTC_H12=RTC_H12_AM; // 15:50:40
RTC_TimeStructure.RTC_Hours=15;
RTC_TimeStructure.RTC_Minutes=50;
RTC_TimeStructure.RTC_Seconds=40;
RTC_SetTime(RTC_Format_BIN,&RTC_TimeStructure);
RTC_AlarmStructure.RTC_AlarmDateWeekDaySel=RTC_AlarmDateWeekDaySel_WeekDay;
RTC_AlarmStructure.RTC_AlarmDateWeekDay=RTC_Weekday_Sunday;
RTC_AlarmStructure.RTC_AlarmMask=RTC_AlarmMask_None;
RTC_AlarmStructure.RTC_AlarmTime=RTC_TimeStructure;// 15:50:40
RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds=45;// 15:50:45
RTC_SetAlarm(RTC_Format_BIN,RTC_Alarm_A,&RTC_AlarmStructure);
RTC_AlarmCmd(RTC_Alarm_A,ENABLE);
RTC_ITConfig(RTC_IT_ALRA,ENABLE);
RTC_ITConfig(RTC_IT_WUT,ENABLE);
RTC_WakeUpCmd(DISABLE);
RTC_WakeUpClockConfig(RTC_WakeUpClock_CK_SPRE_16bits);
RTC_SetWakeUpCounter(0);
RTC_WakeUpCmd(ENABLE);
}

复制代码

void RTC_NvicExti_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = RTC_Alarm_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
EXTI_ClearITPendingBit(EXTI_Line17);
EXTI_InitStructure.EXTI_Line=EXTI_Line17;
EXTI_InitStructure.EXTI_LineCmd =ENABLE;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = RTC_WKUP_IRQn ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
EXTI_ClearITPendingBit(EXTI_Line20);
EXTI_InitStructure.EXTI_Line=EXTI_Line20;
EXTI_InitStructure.EXTI_LineCmd =ENABLE;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising;
EXTI_Init(&EXTI_InitStructure);
}

复制代码

中断函数中就只是输出信息和清除标志，没有其他的。

RTC_TimeTypeDef GetTime;
RTC_DateTypeDef GetDate;
void RTC_Test(void)
{
RTC_Config();
RTC_NvicExti_Config();
//delay_ms(1000);
RTC_GetDate(RTC_Format_BIN,&GetDate);
printf("Date: %02d,%02d,%02d 星期 %d\n",GetDate.RTC_Year,GetDate.RTC_Month,GetDate.RTC_Date,GetDate.RTC_WeekDay);
RTC_GetTime(RTC_Format_BIN,&GetTime);
printf("Time: %2d:%2d:%2d\n",GetTime.RTC_Hours,GetTime.RTC_Minutes,GetTime.RTC_Seconds);
printf("-----------------------------------------------\n");
}
void RTC_Alarm_IRQHandler(void)
{
if(RTC_GetITStatus(RTC_IT_ALRA)!=RESET)
{
RTC_ClearITPendingBit(RTC_IT_ALRA);
printf("\n-----------这是闹钟 A ------------------\n");
RTC_GetTime(RTC_Format_BIN,&GetTime);
printf("Time: %02d:%02d:%02d\n",GetTime.RTC_Hours,GetTime.RTC_Minutes,GetTime.RTC_Seconds);
printf("--------------------------------------\n");
}
EXTI_ClearITPendingBit(EXTI_Line17);
}
void RTC_WKUP_IRQHandler(void)
{
if(RTC_GetITStatus(RTC_IT_WUT))
{
RTC_ClearITPendingBit(RTC_IT_WUT);
RTC_GetTime(RTC_Format_BIN,&GetTime);
printf("Time: %02d:%02d:%02d\n",GetTime.RTC_Hours,GetTime.RTC_Minutes,GetTime.RTC_Seconds);
}
EXTI_ClearITPendingBit(EXTI_Line20);
}

复制代码

补上两个中断处理函数，main函数中调用 RTC_Test()；然后就进入死循环，没有了

/**
******************************************************************************
* @file stm32_rtc.c
* @author fengzi
* @version
* @date 2015,05,31
* @brief
******************************************************************************
*/

/*------------------------------------------------------------------*/

#include "stm32_rtc.h"

RTC_TimeTypeDef GetTime;
RTC_DateTypeDef GetDate;

void RTC_Test(void)
{

RTC_Config();
RTC_NvicExti_Config();

//delay_ms(1000);

RTC_GetDate(RTC_Format_BIN,&GetDate);
printf("Date: %02d,%02d,%02d 星期 %d\n",GetDate.RTC_Year,GetDate.RTC_Month,GetDate.RTC_Date,GetDate.RTC_WeekDay);
RTC_GetTime(RTC_Format_BIN,&GetTime);
printf("Time: %2d:%2d:%2d\n",GetTime.RTC_Hours,GetTime.RTC_Minutes,GetTime.RTC_Seconds);
printf("-----------------------------------------------\n");

}

void RTC_Config(void)
{
RTC_TimeTypeDef RTC_TimeStructure;
RTC_DateTypeDef RTC_DateStructure;
RTC_InitTypeDef RTC_InitStructure;
RTC_AlarmTypeDef RTC_AlarmStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR,ENABLE);

PWR_BackupAccessCmd(ENABLE);
RCC_BackupResetCmd(ENABLE);
RCC_BackupResetCmd(DISABLE);

RCC_LSEConfig(RCC_LSE_ON);
while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET);
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
RCC_RTCCLKCmd(ENABLE);
RTC_WaitForSynchro();

RTC_InitStructure.RTC_HourFormat=RTC_HourFormat_24;
RTC_InitStructure.RTC_AsynchPrediv=0x7F;
RTC_InitStructure.RTC_SynchPrediv=0xFF;
RTC_Init(&RTC_InitStructure);

RTC_DateStructure.RTC_Date=31;// 15,05,31
RTC_DateStructure.RTC_Month=RTC_Month_May;
RTC_DateStructure.RTC_Year=15;
RTC_DateStructure.RTC_WeekDay=RTC_Weekday_Sunday;
RTC_SetDate(RTC_Format_BIN,&RTC_DateStructure);

RTC_TimeStructure.RTC_H12=RTC_H12_AM;// 15:50:40
RTC_TimeStructure.RTC_Hours=15;
RTC_TimeStructure.RTC_Minutes=50;
RTC_TimeStructure.RTC_Seconds=40;
RTC_SetTime(RTC_Format_BIN,&RTC_TimeStructure);

RTC_AlarmStructure.RTC_AlarmDateWeekDaySel=RTC_AlarmDateWeekDaySel_WeekDay;
RTC_AlarmStructure.RTC_AlarmDateWeekDay=RTC_Weekday_Sunday;
RTC_AlarmStructure.RTC_AlarmMask=RTC_AlarmMask_None;
RTC_AlarmStructure.RTC_AlarmTime=RTC_TimeStructure;// 15:50:40
RTC_AlarmStructure.RTC_AlarmTime.RTC_Seconds=45;// 15:50:45
RTC_SetAlarm(RTC_Format_BIN,RTC_Alarm_A,&RTC_AlarmStructure);
RTC_AlarmCmd(RTC_Alarm_A,ENABLE);

RTC_ITConfig(RTC_IT_ALRA,ENABLE);
RTC_ITConfig(RTC_IT_WUT,ENABLE);

RTC_WakeUpCmd(DISABLE);
RTC_WakeUpClockConfig(RTC_WakeUpClock_CK_SPRE_16bits);
RTC_SetWakeUpCounter(0);
RTC_WakeUpCmd(ENABLE);

}

void RTC_NvicExti_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;

NVIC_InitStructure.NVIC_IRQChannel = RTC_Alarm_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

EXTI_ClearITPendingBit(EXTI_Line17);
EXTI_InitStructure.EXTI_Line=EXTI_Line17;
EXTI_InitStructure.EXTI_LineCmd =ENABLE;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising;
EXTI_Init(&EXTI_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = RTC_WKUP_IRQn ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

EXTI_ClearITPendingBit(EXTI_Line20);
EXTI_InitStructure.EXTI_Line=EXTI_Line20;
EXTI_InitStructure.EXTI_LineCmd =ENABLE;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising;
EXTI_Init(&EXTI_InitStructure);

}

void RTC_Alarm_IRQHandler(void)
{
if(RTC_GetITStatus(RTC_IT_ALRA)!=RESET)
{
RTC_ClearITPendingBit(RTC_IT_ALRA);
printf("\n-----------这是闹钟 A ------------------\n");
RTC_GetTime(RTC_Format_BIN,&GetTime);
printf("Time: %02d:%02d:%02d\n",GetTime.RTC_Hours,GetTime.RTC_Minutes,GetTime.RTC_Seconds);
printf("--------------------------------------\n");
}
EXTI_ClearITPendingBit(EXTI_Line17);
}

void RTC_WKUP_IRQHandler(void)
{
if(RTC_GetITStatus(RTC_IT_WUT))
{
RTC_ClearITPendingBit(RTC_IT_WUT);
RTC_GetTime(RTC_Format_BIN,&GetTime);
printf("Time: %02d:%02d:%02d\n",GetTime.RTC_Hours,GetTime.RTC_Minutes,GetTime.RTC_Seconds);
}
EXTI_ClearITPendingBit(EXTI_Line20);
}

===============================。h文件------------------------------------------

/**
******************************************************************************
* @file stm32_rtc.h
* @author fengzi
* @version
* @date 2015,05,31
* @brief
******************************************************************************
*/

/*------------------------------------------------------------------*/

#ifndef __STM32_RTC_H
#define __STM32_RTC_H

#include "stm32f30x.h"
#include "stm32f30x_rtc.h"
#include "stm32f30x_rcc.h"
#include "stm32f30x_pwr.h"
#include "stm32f30x_gpio.h"
#include "stm32f30x_misc.h"
#include "stm32f30x_exti.h"
#include "stdio.h"
#include "delay.h"

void RTC_Config(void);
void RTC_NvicExti_Config(void);
void RTC_Test(void);

void RTC_Alarm_IRQHandler(void);
void RTC_WKUP_IRQHandler(void);

#endif

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