HAL_RTC_SetTime Timeout

[George.P]

Posted on June 22, 2015 at 11:33

Hello,

HAL_RTC_SetTime

fails when trying to set new values on the RTC due to 

RTC_EnterInitMode

timeout.

while((hrtc->Instance->ISR & RTC_ISR_INITF) == (uint32_t)RESET)

{ if((HAL_GetTick() - tickstart) >  RTC_TIMEOUT_VALUE) {        return HAL_TIMEOUT; } }During init (

MX_RTC_Init

)

HAL_RTC_SetTime

is successful.STM32L151RDCubeMX 4.8.0L1 Library 1.2.0LCI RC @ 37kHz configured by 

SystemClock_Config()

Any clues?Thanks!George

[George.P]

Posted on June 22, 2015 at 14:16

After some time I figured out that the the RTC Backup domain must be unlocked.

HAL_PWR_EnableBkUpAccess 

must be called before calling any RTC set functions.