Setting RTC wake up timer for perioic wake up

[jrichards]

Posted on July 17, 2011 at 21:55

I've pored over the user guide and various app notes but cannot seem to get the RTC wakeup timer to start running, so no WU interrupt and I get stuck in halt mode.

Can someone give me a difinitive checklist of what register bits need to be set/reset to get the timer started. I need to check that what I think I should be doing from reading the user manual is right. Many thanks Jeremy

[Stm32User]

Posted on July 29, 2011 at 12:49

I am using STM8L151 with external 32khz crystal ( LSE)

Here is the setup code, in my application used as a 50ms systick interrupt

 CLK_PeripheralClockConfig(CLK_Peripheral_RTC, ENABLE);

 CLK_RTCClockConfig(CLK_RTCCLKSource_LSE, CLK_RTCCLKDiv_1);

 RTC_WakeUpClockConfig(RTC_WakeUpClock_RTCCLK_Div16);

 RTC_ITConfig(RTC_IT_WUT, ENABLE);

RTC_SetWakeUpCounter(_50ms_TIMER_VAL);

 RTC_WakeUpCmd(ENABLE);

then enable interrupts 

RTC_ITConfig(RTC_IT_WUT, ENABLE);

In interrupt handler clear the interrupt source 

if( RTC_GetFlagStatus(RTC_FLAG_WUTF) == SET )

{

   RTC_ClearITPendingBit(RTC_IT_WUT);

}

[hakan23]

Posted on January 15, 2013 at 14:57

Hello Patrick

Are you still working with this processor ?? Can you please send the smallest possible complete example for this ?? best regards   Hakan

[Stm32User]

Posted on January 24, 2013 at 20:03

I would use the firmware library as its already written,tested and documented. You can then spend time on your application instead of wasting time re-writing something which already works. 

You can download the firmware library here:-http://www.st.com/internet/com/SOFTWARE_RESOURCES/SW_COMPONENT/FIRMWARE/stm8l15x_stdperiph_lib.zipIf you really want to minimise the code size then for each of the function calls in the code strip out the lines of code you need.For example  CLK_PeripheralClockConfig(CLK_Peripheral_RTC, ENABLE);Find this function, look at the code and strip out the lines of code which actually enable the peripheral.