CubeMX not generating PLL2 code for USB

[mangobay11]

Hi,

I am using STM32F105RC. CubeMX does not seem to configure PLL2 at all in SystemClock_Config(). Below in the clock configurator it is clear that I have enabled PLL2 to be used for PLLCLK and USB clock.

Seems like a CubeMX bug. Or if someone can point me to what I am doing wrong that would be appreciated.

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV5;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.Prediv1Source = RCC_PREDIV1_SOURCE_PLL2;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL6;
  RCC_OscInitStruct.PLL2.PLL2State = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSE;
  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_1) != HAL_OK)
  {
    Error_Handler();
  }
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;
  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLL_DIV2;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure the Systick interrupt time
  */
  __HAL_RCC_PLLI2S_ENABLE();
}

[mƎALLEm]

But here you're setting the system clock config to HSE not to PLL. Or I didn't understand your question?

[mangobay11]

Thanks for the reply!

The PLL is used for USB clock, and I have the USB OTG peripheral enabled. Is it not expected for CubeMX to generate clock configuration code for USB? Or does that clock configuration code live elsewhere?

[mƎALLEm]

Normally this is the USB clock config:

  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;
  PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLL_DIV2;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }

Do you expect something else?

[mangobay11]

The code snippet you posted seems fine to me, and you will find that exact same code snippet in my original post.

However, the problem is that code to configure and enable PLL2 is not being generated. (see line 18 in my code snippet). USB clock uses PLL and PLL uses PLL2, as my clock configurator screenshot shows, so PLL2 must be enabled and configured for USB clock to work.

[mƎALLEm]

Ok I see. You should have mentioned line 18 from the beginning.

Need to check internally and get back to you.

Internal ticket number 190360 (to confirm the bug and to fix it).

[mangobay11]

Thanks for creating the ticket. Any idea if the team is working on a fix and when we can expect the fix to be released?

[mangobay11]

Any updates?

[mƎALLEm]

If there will be an update, I will infrom you. But don't expect to have a release in the coming days.

[mƎALLEm · Accepted solution]

Fixed in CubeMx version 6.13.0.