STM32CubeMX 4.25 STM32L433RCTx SystemClock_Config Bug PLLM

Posted on April 11, 2018 at 11:48

Hi guys.

I'm working in a STM32L433RCTP based project.

The code generated by the Stm32CubeMX for clock configuration has no value set for the PLL-M prescaler in the  PLL struct, see original code:

----------------------------------

/**Initializes the CPU, AHB and APB busses clocks

*/

RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48|RCC_OSCILLATORTYPE_HSE;

RCC_OscInitStruct.HSEState = RCC_HSE_ON;

RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;

RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;

RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;

RCC_OscInitStruct.PLL.PLLN = 10;

RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;

RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;

RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;

if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

{

_Error_Handler(__FILE__, __LINE__);

}

----------------------------------

I fixed it, by adding the folowing line:

RCC_OscInitStruct.PLL.PLLM = 1;

Even with PLLM prescalers set with different values than 1, CubeMX will forget to add the line.

If I don't add the line, the program freezes at the function call of  HAL_RCC_OscConfig(..).

The bug seems to be occured in a different configuration in the past, too, see:

https://community.st.com/0D50X00009Xkh6lSAB

 

https://community.st.com/0D50X00009XkXG9SAN

 

#system_clock #cubemx-v4.25.0 #systemclock_config #stm32l433rctx