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programming SPI on STM32F091RC

Question asked by perun.raphael on Apr 22, 2015
Hi everyone,
I'm trying to program the SPI2 of my STM32 to only transmit data at 18Mbit/s as I saw on datasheet.
My problem is to configure the "SPI_HandleTypeDef" in order to use the function :

HAL_StatusTypeDef HAL_SPI_Transmit(SPI_HandleTypeDef *hspi, uint8_t *pData, uint16_t Size, uint32_t Timeout);

As I want to only transmit I don't know what to put into the following fields of the SPI_HandleTypeDef :
 uint8_t               *pTxBuffPtr;           /* Pointer to SPI Tx transfer Buffer */
  uint16_t               TxXferSize;           /* SPI Tx Transfer size */
  uint16_t               TxXferCount;          /* SPI Tx Transfer Counter */
  uint8_t               *pRxBuffPtr;           /* Pointer to SPI Rx transfer Buffer */
  uint16_t                RxXferSize;          /* SPI Rx Transfer size */
  uint16_t               RxXferCount;          /* SPI Rx Transfer Counter */
  uint32_t                   CRCSize;          /* SPI CRC size used for the transfer */
  void (*RxISR)(struct __SPI_HandleTypeDef *hspi); /* function pointer on Rx IRQ handler   */
  void (*TxISR)(struct __SPI_HandleTypeDef *hspi); /* function pointer on Tx IRQ handler   */
  DMA_HandleTypeDef          *hdmatx;          /* SPI Tx DMA Handle parameters   *
  DMA_HandleTypeDef          *hdmarx;          /* SPI Rx DMA Handle parameters   */
  HAL_LockTypeDef               Lock;          /* Locking object                 */
  HAL_SPI_StateTypeDef         State;          /* SPI communication state        */
  HAL_SPI_ErrorTypeDef     ErrorCode;         /* SPI Error code                 */

Here you have my main :

#include "stm32f0xx.h"
#include "system_stm32f0xx.h"
#include "stm32f0xx_hal_rcc.h"
#include "stm32f0xx_hal_spi.h"
int main(void)
    /***** Variables *****/
    uint32_t Freq_syst;
    HAL_StatusTypeDef SPI_status;
    SPI_HandleTypeDef SPI_handle;
    SPI_InitTypeDef SPI_init_struct;
    SPI_init_struct.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
    SPI_init_struct.CLKPhase = SPI_POLARITY_LOW;
    SPI_init_struct.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
    SPI_init_struct.DataSize = SPI_DATASIZE_16BIT;
    SPI_init_struct.Direction = SPI_DIRECTION_1LINE;
    SPI_init_struct.FirstBit = SPI_FIRSTBIT_LSB; //peut être mettre MSB first
    SPI_init_struct.Mode = SPI_MODE_MASTER;
    SPI_init_struct.NSS = SPI_NSS_SOFT;
    SPI_init_struct.NSSPMode = SPI_NSS_PULSE_DISABLED;
    SPI_init_struct.TIMode = SPI_TIMODE_ENABLED;
    SPI_handle.Instance = SPI2;
    SPI_handle.Init = SPI_init_struct;


Thank you for your help,