The STMicroelectronics microcontroller requires you to configure the system and peripheral clocks. In a STM32L4 demo, the system clock is typically configured in SystemClock_Config, which is called in main. The peripheral clocks are typically configured within the stm32l4xx_hal_msp.c file. In this guide, the GPIO clocks are configured (for nHib, CS, and so forth) in cc_pal.c. The SPI peripheral clock can be configured in stm32l4xx_hal_msp.c by including the cc_pal.h header file. HAL_SPI_MspInit and HAL_SPI_MspDeInit are standard functions from the STM32L4 HAL library.

#include "cc_pal.h"

/**
  * @brief SPI MSP Initialization 
  *        This function configures the hardware resources used in this example: 
  *           - Peripheral's clock enable
  *           - Peripheral's GPIO Configuration  
  * @param hspi: SPI handle pointer
  * @retval None
  */
void HAL_SPI_MspInit(SPI_HandleTypeDef *hspi)
{
    GPIO_InitTypeDef  GPIO_InitStruct;

    if(hspi->Instance == SPIx)
    {     

        /* Enable GPIO TX/RX clock */
        SPIx_SCK_GPIO_CLK_ENABLE();
        SPIx_MISO_GPIO_CLK_ENABLE();
        SPIx_MOSI_GPIO_CLK_ENABLE();
        /* Enable SPI clock */
        SPIx_CLK_ENABLE(); 

    
        /* SPI SCK GPIO pin configuration  */
        GPIO_InitStruct.Pin       = SPIx_SCK_PIN;
        GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Pull      = GPIO_PULLDOWN;
        GPIO_InitStruct.Speed     = GPIO_SPEED_FAST;
        GPIO_InitStruct.Alternate = SPIx_SCK_AF;
        HAL_GPIO_Init(SPIx_SCK_GPIO_PORT, &GPIO_InitStruct);

        /* SPI MISO GPIO pin configuration  */
        GPIO_InitStruct.Pin = SPIx_MISO_PIN;
        GPIO_InitStruct.Pull = GPIO_PULLUP;
        HAL_GPIO_Init(SPIx_MISO_GPIO_PORT, &GPIO_InitStruct);

        /* SPI MOSI GPIO pin configuration  */
        GPIO_InitStruct.Pin = SPIx_MOSI_PIN;
        HAL_GPIO_Init(SPIx_MOSI_GPIO_PORT, &GPIO_InitStruct);
	

  	/* NVIC for SPI */
 	HAL_NVIC_SetPriority(SPIx_IRQn, 1, 0);
  	HAL_NVIC_EnableIRQ(SPIx_IRQn);
    }
}

/**
  * @brief SPI MSP De-Initialization 
  *        This function frees the hardware resources used in this example:
  *          - Disable the Peripheral's clock
  *          - Revert GPIO configuration to its default state
  * @param hspi: SPI handle pointer
  * @retval None
  */
void HAL_SPI_MspDeInit(SPI_HandleTypeDef *hspi)
{
    if(hspi->Instance == SPIx)
    {   
        /* Reset peripherals */
        SPIx_FORCE_RESET();
        SPIx_RELEASE_RESET();
    
        /* Configure SPI SCK as alternate function  */
        HAL_GPIO_DeInit(SPIx_SCK_GPIO_PORT, SPIx_SCK_PIN);
        /* Configure SPI MISO as alternate function  */
        HAL_GPIO_DeInit(SPIx_MISO_GPIO_PORT, SPIx_MISO_PIN);
        /* Configure SPI MOSI as alternate function  */
        HAL_GPIO_DeInit(SPIx_MOSI_GPIO_PORT, SPIx_MOSI_PIN);
	
  	/* Disable the NVIC for SPI */
  	HAL_NVIC_DisableIRQ(SPIx_IRQn);
    }
}

If the application is using FreeRTOS without the CMSIS abstraction layer, the SysTick_Handle in stm32l4xx_it.c should also be updated:

/* Comment out #include "cmsis_os.h" */

/**
  * @brief  This function handles SysTick Handler.
  * @param  None
  * @retval None
  */
void SysTick_Handler(void)
{

    HAL_IncTick();
  
    if (xTaskGetSchedulerState() != taskSCHEDULER_NOT_STARTED)
    {
        xPortSysTickHandler();
    }
}