Posted on September 19, 2013 at 15:57Hi all,
I have trouble with RTC on STM32VLDISCOVERY board.
After initialization, when I'm calling RTC_WaitForLastTask() after RTC_SetCounter() function, the MCU falls into an infinite loop.
I can't get what is wrong.
Is this hardware issue, if yes is there any workaround?
My Code is :
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 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();
/* Set RTC counter: set RTC counter to 0 */
RTC_SetCounter(0);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
}
void main() {
....
if (BKP_ReadBackupRegister(BKP_DR1) != 0xA5A5)
{
RTC_Configuration();
BKP_WriteBackupRegister(BKP_DR1, 0xA5A5);
}
else
{
RTC_WaitForSynchro();
RTC_ITConfig(RTC_IT_SEC, ENABLE);
RTC_WaitForLastTask();
}
RCC_ClearFlag();
....
while(1) {
....
RTC_WaitForLastTask();
RTC_SetCounter(1379598788);
RTC_WaitForLastTask();
....
}
}
Thanks in advance.
Best Regards,
Hayk
#stm32f10x-rtc
