STM32CubeMX H7S3 RCC_CCIPR1 incorrect initalization code generation

[PHT]

When using PLL3Q as input with a frequency of 32MHz for USBPHY I have a RCC_CCIPR1 register initialized at value 0x2a00 when entreing USB_CoreReset function that is not correct (should be 0x2b00).

[Ghofrane GSOURI]

Hello @PHT 

Could you please share your IOC file? Having access to it will help me investigate the issue more thoroughly and gain a better understanding of your configuration.

THX

Ghofrane

[FBL]

Hi @PHT 

An internal ticket is submitted to dedicated team for a fix in driver! (220943) It seems  LL_RCC_USBREF_CLKSOURCE is not implemented in current HAL/LL driver.

[FBL]

Hi @PHT 

Here is the updates to avoid blocking your progress while waiting for the official fix in the next release: 

1. Add RCCEx_USBREF_Clock_Source here, as follows :

    uint32_t UsbRefClockSelection; /*!< Specifies USBREF clock frequency.
    This parameter can be a value of @ref RCCEx_USBREF_Clock_Source */​

2. Here,  define RCCEx_USBREF_Clock_Sources to be selected as follows:

   /** @defgroup RCCEx_USBREF_Clock_Source Peripheral USBREF clock frequency selection
    * @{
    */
   #define RCC_USBREFCLKSOURCE_16M ((uint32_t)(RCC_CCIPR1_USBREFCKSEL_1 | RCC_CCIPR1_USBREFCKSEL_0))
   #define RCC_USBREFCLKSOURCE_19_2M ((uint32_t)RCC_CCIPR1_USBREFCKSEL_3)
   #define RCC_USBREFCLKSOURCE_20M ((uint32_t)(RCC_CCIPR1_USBREFCKSEL_3 | RCC_CCIPR1_USBREFCKSEL_0))
   #define RCC_USBREFCLKSOURCE_24M ((uint32_t)(RCC_CCIPR1_USBREFCKSEL_3 | RCC_CCIPR1_USBREFCKSEL_1))
   #define RCC_USBREFCLKSOURCE_26M ((uint32_t)(RCC_CCIPR1_USBREFCKSEL_3 |\
    RCC_CCIPR1_USBREFCKSEL_2 | RCC_CCIPR1_USBREFCKSEL_1))
   #define RCC_USBREFCLKSOURCE_32M ((uint32_t)(RCC_CCIPR1_USBREFCKSEL_3 |\
    RCC_CCIPR1_USBREFCKSEL_1 | RCC_CCIPR1_USBREFCKSEL_0))
   /**
    * @}
    */​

    

3. Now, you can add macros for configuring and reading USBREF clock sources

   
   /** @brief Macro to configure the USBREF clock frequency
    * @param __USBREF_CLKSOURCE__ specifies the USBREF clock frequency.
    * This parameter can be one of the following values:
    * @arg RCC_USBREFCLKSOURCE_16M 16 MHz clock selected as USBPHYC clock
    * @arg RCC_USBREFCLKSOURCE_19_2M 19.2 MHz clock selected as USBPHYC clock
    * @arg RCC_USBREFCLKSOURCE_20M 20 MHz clock selected as USBPHYC clock
    * @arg RCC_USBREFCLKSOURCE_24M 24 MHz clock selected as USBPHYC clock
    * @arg RCC_USBREFCLKSOURCE_26M 26 MHz clock selected as USBPHYC clock
    * @arg RCC_USBREFCLKSOURCE_32M 32 MHz clock selected as USBPHYC clock
    */
   #define __HAL_RCC_USBREF_CONFIG(__USBREF_CLKSOURCE__) \
    MODIFY_REG(RCC->CCIPR1, RCC_CCIPR1_USBREFCKSEL, (uint32_t)(__USBREF_CLKSOURCE__))
   
   /** @brief Macro to get the USBREF clock frequency.
    * @retval The clock source can be one of the following values:
    * @arg RCC_USBREFCLKSOURCE_16M 16 MHz clock selected as USBPHYC clock
    * @arg RCC_USBREFCLKSOURCE_19_2M 19.2 MHz clock selected as USBPHYC clock
    * @arg RCC_USBREFCLKSOURCE_20M 20 MHz clock selected as USBPHYC clock
    * @arg RCC_USBREFCLKSOURCE_24M 24 MHz clock selected as USBPHYC clock
    * @arg RCC_USBREFCLKSOURCE_26M 26 MHz clock selected as USBPHYC clock
    * @arg RCC_USBREFCLKSOURCE_32M 32 MHz clock selected as USBPHYC clock
    */
   #define __HAL_RCC_GET_USBREF_SOURCE() ((uint32_t)(READ_BIT(RCC->CCIPR1, RCC_CCIPR1_USBREFCKSEL)))
   ​

4. Now,  here add check for validated clock source

   #define IS_RCC_USBREFCLKSOURCE(__SOURCE__) \
    (((__SOURCE__) == RCC_USBREFCLKSOURCE_16M) || \
    ((__SOURCE__) == RCC_USBREFCLKSOURCE_19_2M) || \
    ((__SOURCE__) == RCC_USBREFCLKSOURCE_20M) || \
    ((__SOURCE__) == RCC_USBREFCLKSOURCE_24M) || \
    ((__SOURCE__) == RCC_USBREFCLKSOURCE_26M) || \
    ((__SOURCE__) == RCC_USBREFCLKSOURCE_32M))
   ​

5. In hal_rcc_ex.c, modify the RCC structure to use USBREF clock selection here :

    assert_param(IS_RCC_USBREFCLKSOURCE(PeriphClkInit->UsbRefClockSelection));​

   then set it here.

    /* Set USBPHYC reference clock frequency*/
    __HAL_RCC_USBREF_CONFIG(PeriphClkInit->UsbRefClockSelection);​

6.  Now, for example here in application code, to implement the initialization, of PeriphClkInit.UsbRefClockSelection = RCC_USBREFCLKSOURCE_32M; within the HAL_PCD_MspInit() function, here is an example

    /** Initializes the peripherals clock
    */
    PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USBPHYC;
    PeriphClkInit.UsbPhycClockSelection = RCC_USBPHYCCLKSOURCE_HSE;
    PeriphClkInit.UsbRefClockSelection = RCC_USBREFCLKSOURCE_32M;
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
    {
    Error_Handler();
    }