SPI not working with STM32L4R5ZI, unable to find RCC_PERIPHCLK_SPI1 for enabling SPI1.

[Dinesh Rangaswamy]

There is no peripheral clock available in specific for SPI in stm32l4xx_hal_rcc_ex.h, Could some one help which clock needs to be enabled for SPI1 communication​ 

[waclawek.jan]

STM32Cube_FW_L4_V1.11.0\Drivers\STM32L4xx_HAL_Driver\Inc\stm32l4xx_hal_rcc.h :

#define __HAL_RCC_SPI1_CLK_ENABLE() do { \
 __IO uint32_t tmpreg; \
 SET_BIT(RCC->APB2ENR, RCC_APB2ENR_SPI1EN); \
 /* Delay after an RCC peripheral clock enabling */ \
 tmpreg = READ_BIT(RCC->APB2ENR, RCC_APB2ENR_SPI1EN); \
 UNUSED(tmpreg); \
 } while(0)

JW

[Dinesh Rangaswamy]

Hi @Community member​ ,

Thanks for the replay =)

I have enabled SPI1 clock as you have mentioned above.

I need to add it to PeriphClockSelection by picking from RCC_PeriphCLKInitTypeDef struct.

e.g.

RCC_PeriphCLKInitTypeDef PeriphClkInit = { 0 };

   PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_RTC | RCC_PERIPHCLK_USART1 | RCC_PERIPHCLK_USART2

           | RCC_PERIPHCLK_USART3 | RCC_PERIPHCLK_UART4 | RCC_PERIPHCLK_I2C3 | RCC_PERIPHCLK_ADC

           | RCC_PERIPHCLK_LPTIM1 | RCC_PERIPHCLK_USB | RCC_PERIPHCLK_LPUART1;

Here with the struct RCC_PeriphCLKInitTypeDef I can see corresponding clocks for USART , I2C USB etc., are available, but SPI PERIPHCLK is not available.

Above the the code that I am using for PeriphClockSelection.

for example I have configured each clocksource as below:

PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2;

   PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;

   PeriphClkInit.Usart3ClockSelection = RCC_USART3CLKSOURCE_PCLK1;

Similar way I am searching an clock source instance for SPI.

could you help/suggest what are the PeriphClockSelection I need to append here ?

Thanks

Dinesh

[waclawek.jan]

RCC_PERIPHCLK_*** are used only if the given peripheral has some dedicated setting in RCC.

SPI1 obviously has none such, it's simply directly clocked from its respective APB clock.

I don't use Cube.

JW

[Dinesh Rangaswamy]

Thanks for the clue.

I would check for the respective APB clock configuration.

Will post a reply once arrived with a solution.

Thanks