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problem with MCO2 from PLL2 (STM32H743)

AOrlo
Associate

no generation on MCO2 after standard system initialization (PLL2P SOURCE) using CUBE (STM32Cube_FW_H7_V1.5.0). Controller - STM32H743VIT6

void SystemClock_Config(void)

{

 RCC_OscInitTypeDef RCC_OscInitStruct = {0};

 RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

 RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};

 /** Supply configuration update enable 

 */

 HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);

 /** Configure the main internal regulator output voltage 

 */

 __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

 while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}

 /** Macro to configure the PLL clock source 

 */

 __HAL_RCC_PLL_PLLSOURCE_CONFIG(RCC_PLLSOURCE_HSE);

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

 */

 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI|RCC_OSCILLATORTYPE_HSE;

 RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;

 RCC_OscInitStruct.LSIState = RCC_LSI_ON;

 RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;

 RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;

 RCC_OscInitStruct.PLL.PLLM = 3;

 RCC_OscInitStruct.PLL.PLLN = 62;

 RCC_OscInitStruct.PLL.PLLP = 2;

 RCC_OscInitStruct.PLL.PLLQ = 2;

 RCC_OscInitStruct.PLL.PLLR = 2;

 RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_3;

 RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE;

 RCC_OscInitStruct.PLL.PLLFRACN = 4096;

 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

 {

  Error_Handler();

 }

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

 */

 RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK

               |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2

               |RCC_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1;

 RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;

 RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;

 RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV2;

 RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2;

 RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2;

 RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2;

 RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2;

 if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)

 {

  Error_Handler();

 }

 PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_UART8|RCC_PERIPHCLK_SPI4

               |RCC_PERIPHCLK_I2C1|RCC_PERIPHCLK_USB

               |RCC_PERIPHCLK_FMC;

 PeriphClkInitStruct.PLL2.PLL2M = 3;

 PeriphClkInitStruct.PLL2.PLL2N = 15;

 PeriphClkInitStruct.PLL2.PLL2P = 4;

 PeriphClkInitStruct.PLL2.PLL2Q = 20;

 PeriphClkInitStruct.PLL2.PLL2R = 60;

 PeriphClkInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_3;

 PeriphClkInitStruct.PLL2.PLL2VCOSEL = RCC_PLL2VCOMEDIUM;

 PeriphClkInitStruct.PLL2.PLL2FRACN = 0;

 PeriphClkInitStruct.PLL3.PLL3M = 3;

 PeriphClkInitStruct.PLL3.PLL3N = 15;

 PeriphClkInitStruct.PLL3.PLL3P = 2;

 PeriphClkInitStruct.PLL3.PLL3Q = 4;

 PeriphClkInitStruct.PLL3.PLL3R = 2;

 PeriphClkInitStruct.PLL3.PLL3RGE = RCC_PLL3VCIRANGE_3;

 PeriphClkInitStruct.PLL3.PLL3VCOSEL = RCC_PLL3VCOMEDIUM;

 PeriphClkInitStruct.PLL3.PLL3FRACN = 0;

 PeriphClkInitStruct.FmcClockSelection = RCC_FMCCLKSOURCE_PLL2;

 PeriphClkInitStruct.Spi45ClockSelection = RCC_SPI45CLKSOURCE_D2PCLK1;

 PeriphClkInitStruct.Usart234578ClockSelection = RCC_USART234578CLKSOURCE_D2PCLK1;

 PeriphClkInitStruct.I2c123ClockSelection = RCC_I2C123CLKSOURCE_D2PCLK1;

 PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_PLL3;

 if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)

 {

  Error_Handler();

 }

 HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_PLL2PCLK, RCC_MCODIV_4);

 /** Enable USB Voltage detector 

 */

 HAL_PWREx_EnableUSBVoltageDetector();

}

3 REPLIES 3
AOrlo
Associate

WORKS, but only after the command:

RCCEx_PLL2_Config(&(PeriphClkInit->PLL2),DIVIDER_P_UPDATE);

- it is not right..

Hi savastleika1,

I have the same problem with the STM32H743 using MC02 from PLL2.

Where do you add the RCCEx_PLL2_Config(&(PeriphClkInit->PLL2),DIVIDER_P_UPDATE);

Help would be much appreciated.

KR JohnW

john239955_st
Associate III

Hi savastleike

Have set this in the stm32H7xx_hal_rcc_ex.c file and works OK

Thanks for the link ... KR John W