USART Clock selection bug / cubemx

[Aurelien Robert]

Hello,

With CubeMX V6.8 (I did not check with latest update), there is a bug in the USART clock source selection, for chip STM32L451VET

When selecting SYSCLK for USART2 or USART3 (did not check with UART4), in the function HAL_UART_MspInit() the clock is init with :

PeriphClkInit.Usart2ClockSelection = RCC_USART1CLKSOURCE_SYSCLK;

instead of 

PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_SYSCLK;

That results in an incorrect initialisation !

I don't know if it is related to the fact that in my project USART1 is also clocked by RCC_USART1CLKSOURCE_SYSCLK

Aurelien

[Peter BENSCH · Accepted solution]

I have just tried to reproduce your problem - at least the current versions of STM32CubeMX and STM32CubeIDE generate the correct USART ClockSelection.

Hope that helps?

Regards
/Peter

[Aurelien Robert]

Hello Peter

I'm deeply sorry for my mistake, it's my only fault when I copied the init parameter from a project copy regenerated with cubemx to my previous project, I copied the same line for the three UART without thinking...

Thank you and sorry again

Aurelien