设置时钟出现死循环

只看该作者 · 2009-4-28 11:49

请高手帮忙，我在设置时间时用以下函数，可是调用RTC_SetCounter(seconds)后程序就死在RTC_WaitForLastTask()上了，不知道是为什么？请高手帮个忙？
void time_adjust(ULONG seconds)
{
  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();
  /* Change the current time */
  RTC_SetCounter(seconds);
  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();
}

void RTC_SetCounter(u32 CounterValue)
{
  RTC_EnterConfigMode();

  /* Set RTC COUNTER MSB word */
  RTC->CNTH = CounterValue >> 16;
  /* Set RTC COUNTER LSB word */
  RTC->CNTL = (CounterValue & RTC_LSB_Mask);

  RTC_ExitConfigMode();
}

void RTC_WaitForLastTask(void)
{
  /* Loop until RTOFF flag is set */
  while ((RTC->CRL & RTC_FLAG_RTOFF) == (u16)RESET)
  {
  }
}

只看该作者 · 2009-4-28 13:41

// Check if the Power On Reset flag is set
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);

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

只看该作者 · 2009-4-29 08:36

谢谢高手，是这样的，问题已解决

设置时钟出现死循环

设置RTC前需使能PWR BKP

问题已解决