Posted on May 17, 2011 at 13:10Hello all,
I am having some issues with my RTC alarm, Im using the stm32f103 dev kit from iar. I am trying to wake the MCU every second from stop mode with an rtc alarm i have succesfully set the interrupt and they unit is going to sleep then waking up but instead of every sencond it wakes up every 2 ! even tough im setting for that ie.
/* Wait till RTC Second event occurs */
RTC_ClearFlag(RTC_FLAG_SEC);
while(RTC_GetFlagStatus(RTC_FLAG_SEC) == RESET);
RTC_WaitForLastTask();
/* Alarm in 1 second */
RTC_SetAlarm(RTC_GetCounter()+1);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFE);
Time_Show();
/* Configures system clock after wake-up from STOP: enable HSE, PLL and select
PLL as system clock source (HSE and PLL are disabled in STOP mode) */
SYSCLKConfig_STOP();
it funny because if i use the rtc sec interrupt instead of the alarm i get anice second interrupt but not from the alarm interrupt furthermore i have this debug string shooting to teraterm that tell me what the time is
************ Reset ************
Time Show
Time: 24:00:02
Time Show
Time: 24:00:04
Time Show
Time: 24:00:06
Time Show
Time: 24:00:08
Time Show
Time: 24:00:10
I am setting the time to be 24:00:00 but as you can see 2 seconds after is when the micro gets woken this tells me that the actual rtc is running fine but for some reason the alarm is screwed up somehow. I am running the micro at 8 mGz HSE and the rtc from the 32 khz LSE here is the RCC config for APB1 and APB2
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);
any ideas guys ???
thank you
