STM32L4 & CubeMX 4.25 clocksettings failure

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);

}