RTC clock not starting consistenly

[TConl.1]

Hi everyone, I'm using the STM8L152R8 Nucleo board and trying to get the RTC running on the LSE clock. It works but only inconsistenly, about 2/3 runs error out in the RTC_EnterInitMode function of the SPL the below line. RTC_EnterInitMode is called from RTC_Init which I call in my setup.

  if ((RTC->ISR1 & RTC_ISR1_INITF) == RESET)
  {
    status = ERROR;
  }

My setup is

while (CLK_GetFlagStatus(CLK_FLAG_LSERDY) == RESET); 
/* wait for 1 second for the LSE Stabilisation */
 
/* Select LSE  as RTC clock source */
CLK_RTCClockConfig(CLK_RTCCLKSource_LSE, CLK_RTCCLKDiv_1); 
CLK_PeripheralClockConfig(CLK_Peripheral_RTC, ENABLE); 
 
RTC_InitTypeDef RTC_InitStr; 
RTC_InitStr.RTC_HourFormat = RTC_HourFormat_24; 
RTC_InitStr.RTC_AsynchPrediv = 0x7F; 
RTC_InitStr.RTC_SynchPrediv = 0x00FF; 
RTC_Init(&RTC_InitStr); 
 
 //setup calender
	

I can see from the registers that the LSE is setup correctly however the RTC is not setup at all.

Can anyone suggest what is happening here?

Thanks!

[TConl.1]

I removed the timeout which has solved the issue though I'm not certain why.

From the manauls init steps :

' Poll INITF bit of in the RTC_ISR register. The initialization phase mode is entered when INITF is set to 1. It takes around 2 RTCCLK clock cycles for synchronization purposes.'

The timeout was '0xFFFF' which should be more than enough time for 2 RTC clock cycles with LSE at 32.768 kHz and HSI at 16 MHz.

If anyone can shed some light on this it would be appreciated. Thanks