Posted on August 03, 2014 at 19:10hello every one i need to use lse for rtc clock src. because i want it still working at the power of( with vbat)
my lse circuit work correctly because i use the mco1 as lse clock src and i have 32.768 khz this pin (pa8).
my sample code is :
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
PWR_BackupAccessCmd(ENABLE);
RCC_LSEConfig(RCC_LSE_ON);
while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
{
}
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
RCC_RTCCLKCmd(ENABLE);
RTC_WaitForSynchro();
RTC_TimeStampCmd(RTC_TimeStampEdge_Falling, ENABLE);
RTC_InitStructure.RTC_AsynchPrediv = 0xff;
RTC_InitStructure.RTC_SynchPrediv =0x7f;
RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
and use :
RTC_GetTime(RTC_Format_BIN, &RTC_TimeStructure);
RTC_TimeStructure.RTC_Hours, RTC_TimeStructure.RTC_Minutes, RTC_TimeStructure.RTC_Seconds
as time value but they are always zero!
but if i change the clock src to lsi , it works correctly
