STM32 RTC闹钟问题

gwm1224 · 发表于 2014-8-20 15:30:01

大家帮我看看我的STM32F107VCT6一直触发不了闹钟中断，目前只能触发秒中断。网上的很多例子都是利用RTC唤醒低功耗模式，我的这个项目不需要闹钟来唤醒低功耗。
我把我的RTC部分代码全贴下面。

/*******************************************************************************
* Function Name : RTC_Configuration
* Description    : Configures the RTC.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RTC_Configuration(void)
{
/* Enable PWR and BKP clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);

/* Allow access to BKP Domain */
PWR_BackupAccessCmd(ENABLE);

/* Reset Backup Domain */
BKP_DeInit();

/* Enable LSE */
RCC_LSEConfig(RCC_LSE_ON);
/* Wait till LSE is ready */
while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
{}

/* Select LSE as RTC Clock Source */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);

/* Enable RTC Clock */
RCC_RTCCLKCmd(ENABLE);

/* Wait for RTC registers synchronization */
RTC_WaitForSynchro();

/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();

   /* Enable the RTC ALARM */
   RTC_ITConfig(RTC_IT_ALR, ENABLE);

/* Enable the RTC Second */
RTC_ITConfig(RTC_IT_SEC, ENABLE);

/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();

/* Set RTC prescaler: set RTC period to 1sec */
RTC_SetPrescaler(32767); /* RTC period = RTCCLK/RTC_PR = (32.768 KHz)/(32767+1) */

/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
}

void RTC_Init(void)
{
if (BKP_ReadBackupRegister(BKP_DR1) != 0xA5A5)
{
    /* Backup data register value is not correct or not yet programmed (when
       the first time the program is executed) */

    printf("\r\n RTC not yet configured....");

      RTC_Configuration();

    printf("\r\n RTC configured....");

    /* Adjust time by values entred by the user on the hyperterminal */
   Time_SetCalendarTime(time_now);
    BKP_WriteBackupRegister(BKP_DR1, 0xA5A5);
}
else
{
    /* Check if the Power On Reset flag is set */
    if (RCC_GetFlagStatus(RCC_FLAG_PORRST) != RESET)
    {
      printf("\r\n\n Power On Reset occurred....");
    }
    /* Check if the Pin Reset flag is set */
    else if (RCC_GetFlagStatus(RCC_FLAG_PINRST) != RESET)
    {
      printf("\r\n\n External Reset occurred....");
    }
    printf("\r\n No need to configure RTC....");
    /* Wait for RTC registers synchronization */
    RTC_WaitForSynchro();

       /* Enable the RTC ALARM */
   RTC_ITConfig(RTC_IT_ALR, ENABLE);

    /* Enable the RTC Second */
    RTC_ITConfig(RTC_IT_SEC, ENABLE);

    /* Wait until last write operation on RTC registers has finished */
    RTC_WaitForLastTask();
}

/* Clear reset flags */
RCC_ClearFlag();
}

void Alarm_PreAdjust(void)
{
// uint32_t alarm_value = 0;
uint32_t tmp = 0;

/* Read the alarm value stored in the Backup register */
tmp = BKP_ReadBackupRegister(BKP_DR6);
tmp |= BKP_ReadBackupRegister(BKP_DR7) << 16;

    tmp = (time_alarm.tm_year + time_alarm.tm_mon + time_alarm.tm_mday + time_alarm.tm_hour
       + time_alarm.tm_min + time_alarm.tm_sec);

/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
/* Set RTC Alarm register with the new value */
RTC_SetAlarm(tmp);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();

          /* Enable PWR and BKP clocks */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);

/* Allow access to BKP Domain */
PWR_BackupAccessCmd(ENABLE);

/* Save the Alarm value in the Backup register */
BKP_WriteBackupRegister(BKP_DR6, (tmp & 0x0000FFFF));
BKP_WriteBackupRegister(BKP_DR7, (tmp >> 16));
PWR_BackupAccessCmd(DISABLE);
}

void Set_RTCAlarm(void)
{
uint32_t tmp = 0;

tmp = RTC_GetCounter();

/* Save the Alarm value in the Backup register */
BKP_WriteBackupRegister(BKP_DR6, (tmp & 0x0000FFFF));
BKP_WriteBackupRegister(BKP_DR7, (tmp >> 16));

Alarm_PreAdjust();

/* Request to enter STOP mode with regulator in low power */
// PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);

}

上面是RTC初始化和设置闹钟函数。

//系统中断管理
void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;
   EXTI_InitTypeDef EXTI_InitStructure;
   /* Configure the NVIC Preemption Priority Bits */
   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

   NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;    //更新事件
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;   //抢占优先级1
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;          //响应优先级1
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;             //允许中断
   NVIC_Init(&NVIC_InitStructure);
       /* 使能 RTC 中断 */

   NVIC_InitStructure.NVIC_IRQChannel = RTC_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);

      /* Enable the RTC Alarm Interrupt */
      NVIC_InitStructure.NVIC_IRQChannel = RTCAlarm_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      /* Enable the EXTI Line17 Interrupt */
      EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
      EXTI_InitStructure.EXTI_Line = EXTI_Line17;
      EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
      EXTI_InitStructure.EXTI_LineCmd = ENABLE;
      EXTI_Init(&EXTI_InitStructure);

}
//配置系统时钟,使能各外设时钟
void RCC_Configuration(void)
{
   SystemInit();
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA
                           | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOB | RCC_APB2Periph_ADC1
                           | RCC_APB2Periph_AFIO, ENABLE );
     RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4 | RCC_APB1Periph_PWR | RCC_APB1Periph_BKP
                           |RCC_APB1Periph_USART2|RCC_APB1Periph_TIM2
                           , ENABLE );
   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
}

下面是RTC闹钟中断函数，一直进不了这里。

/*******************************************************************************
* Function Name : RTCAlarm_IRQHandler
* Description    : This function handles RTC Alarm interrupt request.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RTCAlarm_IRQHandler(void)
{
   /* Clear the Alarm Pending Bit */
RTC_ClearITPendingBit(RTC_IT_ALR);

      AlarmStatus = 1;
      alarm_flag = 1;
// Set_STOPModeStatus();
       LED1 = 1;
/* Clear the EXTI Line 17/ */
EXTI_ClearITPendingBit(EXTI_Line17);

}

进不了RTCAlarm_IRQHandler(void)的时候我又在下面函数中也同样插入了闹钟处理函数。

/*******************************************************************************
* Function Name : RTC_IRQHandler
* Description    : This function handles RTC global interrupt request.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RTC_IRQHandler(void)
{
   if(RTC_GetITStatus(RTC_IT_SEC) != RESET)
   {
           Time_Show();
       /* 清除 RTC 秒中断 */
       RTC_ClearITPendingBit(RTC_IT_SEC);
       /* 更新时间显示标志位 */
    //   TimeDisplay = 1;
   }
   if (RTC_GetITStatus(RTC_IT_ALR) != RESET){

      AlarmStatus = 1;
      alarm_flag = 1;
// Set_STOPModeStatus();
       LED1 = 1;
       /* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
/* Clear the Alarm Pending Bit */
       RTC_ClearITPendingBit(RTC_IT_ALR);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
/* Clear the EXTI Line 17/ */
EXTI_ClearITPendingBit(EXTI_Line17);

   }
}

上面那个函数只能秒中断处理能进入。另外我的RTC闹钟值是能设置成功的，包括BKP->DR6，DR7都能写入成功，目前就是不能触发闹钟中断标志位。
先在这里谢谢了。