SystemClock_Config hangs

[sde c.1]

it seems my project hangs at this line ?

if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
 
 {
 
  Error_Handler();
 
 }

What could be wrong?

 

[TDK]

Is this a custom board or known good hardware? Seems like you have a problem with the LSE connection.

You can try increasing the timeout value (LSE_STARTUP_TIMEOUT) to tens of seconds to see if it helps.

Edit:

Also, "hangs" is ambiguous. It is expected that the LSE will take some time to become stable. Does it return successfully after a few seconds or does it fail and return HAL_TIMEOUT?

[sde c.1]

Its a custom board, i will show the schematic and PCB design.

increasing timeout does not help.

After further investigation i see the Backup Domain Write Protection disabling goes in timeout.

Can't figure out why this is happening.

Any idea's?

/* Wait for Backup domain Write protection disable */
      tickstart = HAL_GetTick();
 
      while(HAL_IS_BIT_CLR(PWR->CR, PWR_CR_DBP))
      {
        if((HAL_GetTick() - tickstart) > RCC_DBP_TIMEOUT_VALUE)
        {
          return HAL_TIMEOUT;
        }
      }
    }

[waclawek.jan]

Is there a write to the DBP bit before the snippet you've posted?

Read out and check if RCC_APB1ENR.PWREN is set.

JW

[sde c.1]

There is a write to PWR_CR_DBP before the snipped i posted, but the bit refuses to set

yes PWREN bit is set  

I notice that the external xtal is not running, (measure nothing on scope), does this have influence at that point of the initialisation?

Wondering why i dont measure anything, as this is a recommended part by STM. I have tried all "LSE drive capability settings"...