STM32L4 & CubeMX 4.25 clocksettings failure

[taraben]

Posted on April 26, 2018 at 19:04

Hello All,

I am using STM32L486RGT, CubeMX 4.25 STM32L4 lib 1.11.

At the STM32 I have a 16MHz crystall connected.

Now I run into problems setting up the clocktree. It works under certain combinations but not under the ones I want.

I want to use the 16MHz crystal, HSE, PLL, USB and CPU running at 64MHz.

not working: 16MHz Crystal, PLLSource:HSE, PLLM:1, PLLN:8, PLLR:2, Sysclock:64MHz, PLLSAI1N:12, PLLSAI1Q:4, USB:PLLSAI1Q:48MHz

working: switching the PLL source to HSI

I tried also with Nucleo Board STM32L452 and found the combination does initially does not work.

I put an 16MHz crystal to the board.

working: 16MHz Crystal, PLLSource:HSE, PLLM:1, PLLN:8, PLLR:2, Sysclock:64MHz

not working: as above, plus USB, PLLSAI1N:2, PLLSAI1Q:4, USB:PLLSAI1Q:48MHz

On all examples: AHBPrescalers are 1 so all peripheral/core/sysclock clocks are 64MHz

Here is the example SysClock Init from the generated not working sample:

the failing function is:

<<

if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

>>

Can anyone confirm those problems?

Regards, Adib.

--

/**

  * @brief System Clock Configuration  * @retval None  */void SystemClock_Config(void){

  RCC_OscInitTypeDef RCC_OscInitStruct;

  RCC_ClkInitTypeDef RCC_ClkInitStruct;  RCC_PeriphCLKInitTypeDef PeriphClkInit;

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

    */  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;  RCC_OscInitStruct.HSEState = RCC_HSE_ON;  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;  RCC_OscInitStruct.PLL.PLLN = 8;  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__);  }

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

    */  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)

  {    _Error_Handler(__FILE__, __LINE__);  }

  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1|RCC_PERIPHCLK_USART3

                              |RCC_PERIPHCLK_LPUART1|RCC_PERIPHCLK_I2C1                              |RCC_PERIPHCLK_USB|RCC_PERIPHCLK_ADC;  PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2;  PeriphClkInit.Usart3ClockSelection = RCC_USART3CLKSOURCE_PCLK1;  PeriphClkInit.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_PCLK1;  PeriphClkInit.I2c1ClockSelection = RCC_I2C1CLKSOURCE_PCLK1;  PeriphClkInit.AdcClockSelection = RCC_ADCCLKSOURCE_SYSCLK;  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLLSAI1;  PeriphClkInit.PLLSAI1.PLLSAI1Source = RCC_PLLSOURCE_HSE;  PeriphClkInit.PLLSAI1.PLLSAI1M = 1;  PeriphClkInit.PLLSAI1.PLLSAI1N = 12;  PeriphClkInit.PLLSAI1.PLLSAI1P = RCC_PLLP_DIV7;  PeriphClkInit.PLLSAI1.PLLSAI1Q = RCC_PLLQ_DIV4;  PeriphClkInit.PLLSAI1.PLLSAI1R = RCC_PLLR_DIV8;  PeriphClkInit.PLLSAI1.PLLSAI1ClockOut = RCC_PLLSAI1_48M2CLK;  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)  {    _Error_Handler(__FILE__, __LINE__);  }

    /**Configure the main internal regulator output voltage

    */  if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)  {    _Error_Handler(__FILE__, __LINE__);  }

    /**Configure the Systick interrupt time

    */  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

    /**Configure the Systick

    */  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

  /* SysTick_IRQn interrupt configuration */

  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);}

[T J]

Posted on May 29, 2018 at 14:32

maybe you need a different clock frequency, what is the exact issue ?

CubeMx 4.22.1

shows everything you want;

PLLM 1   x8   /2 = 64mhz /1 Hclk =64MHz

USB clock source is PLLSAI1Q

which is x12  /4

[taraben]

Posted on May 29, 2018 at 15:24

the IOC file is in the original posts section. sam2_goware.ioc.

My board is based on STM32L486RGT7. Crystal frequency is 16MHz. USB is connected.

For test purposes I ususaly use the Nucleo-L476RG board (but that has different crystal).

The problem is not board specific: the code stucks in SystemClock_Config() and runs into the Error handler.

Adib.

--

[T J]

Posted on May 29, 2018 at 16:27

it gets stuck here ?

void SystemClock_Config(void)

{

  RCC_OscInitTypeDef RCC_OscInitStruct;

  RCC_ClkInitTypeDef RCC_ClkInitStruct;  RCC_PeriphCLKInitTypeDef PeriphClkInit;

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

    */  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;  RCC_OscInitStruct.HSEState = RCC_HSE_ON;  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;  RCC_OscInitStruct.PLL.PLLN = 8;  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__);  }

where did you set PLLM as /1 ?

where did you set AHB Prescaler as /1 ?

why is   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;  ?  HSE ?

did you enable the CSS ? should you ?

Clive ?

[Tesla DeLorean]

Posted on May 29, 2018 at 16:37

Does the code show a PLLM setting, or not?

Make sure to clear the auto/local declaration on the stack.

Follow the error path backward to understand where in the source it is triggered.

[Tesla DeLorean]

Posted on May 29, 2018 at 16:39

Not describing PLLM parameter?

Consider RCC_OscInitTypeDef RCC_OscInitStruct = {0}; so that initial values are clearly defined and not subject to noise from stack.

It probably throws an error and then gets stuck in the Error_Handler(), going to have to work backward, through code to determine cause. You have the source, you have a debugger, shouldn't take too long to pinpoint the cause/reason for the error.

[T J]

Posted on May 29, 2018 at 17:08

can you to single step inside HAL_RCC_OscConfig,

which line causes the problem ?

[taraben]

Posted on May 29, 2018 at 17:11 The original post was too long to process during our migration. Please click on the provided URL to read the original post. https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I6v9&d=%2Fa%2F0X0000000by1%2F0BEBHQCfglgh98oUcc.WV2fQl.PGff.fJT8G1.Q2s.I&asPdf=false

[Tesla DeLorean]

Posted on May 29, 2018 at 19:28

void SystemClock_Config(void)

{

   RCC_OscInitTypeDef RCC_OscInitStruct = {0};

  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};

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

    */  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;  RCC_OscInitStruct.HSEState = RCC_HSE_ON;  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;  RCC_OscInitStruct.PLL.PLLM = 1;  RCC_OscInitStruct.PLL.PLLN = 12;  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV4;  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)  {    _Error_Handler(__FILE__, __LINE__);  }

...

Check obvious things like HSE ticking, and PLL parameters not exceeded