STM32H750 SPI发送32位数据求助

阿超写代码

单片机是STM32H750VBT6   SPI的初始化配置为32位模式   使用HAL库  但是库函数发送函数定义的uint8格式 参数       HAL_StatusTypeDef HAL_SPI_TransmitReceive(SPI_HandleTypeDef *hspi, uint8_t *pTxData, uint8_t *pRxData, uint16_t Size,uint32_t Timeout)

我是这样调用的  发现通讯失败 还请使用过的大神指导下


uint32_t SPI2_read_write_byte(uint32_t txdata)
{
         uint32_t rxdata;
         if(HAL_SPI_TransmitReceive(&hspi2,(uint8_t *)&txdata,(uint8_t *)&rxdata,1,1000)!=HAL_OK)
         {
            return 0;
         }
   return rxdata;       

}

阿超写代码

  hspi2.Instance = SPI2;   hspi2.Init.Mode = SPI_MODE_MASTER;  
hspi2.Init.Direction = SPI_DIRECTION_2LINES;
  hspi2.Init.DataSize = SPI_DATASIZE_32BIT;   
hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;  
hspi2.Init.CLKPhase = SPI_PHASE_1EDGE;  
hspi2.Init.NSS = SPI_NSS_SOFT;
  hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;
  hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi2.Init.TIMode = SPI_TIMODE_DISABLE;  
hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi2.Init.CRCPolynomial = 0x0;   
hspi2.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
  hspi2.Init.NSSPolarity = SPI_NSS_POLARITY_LOW;  
hspi2.Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;
   hspi2.Init.TxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;  
hspi2.Init.RxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
  hspi2.Init.MasterSSIdleness = SPI_MASTER_SS_IDLENESS_00CYCLE;  
hspi2.Init.MasterInterDataIdleness = SPI_MASTER_INTERDATA_IDLENESS_00CYCLE;
  hspi2.Init.MasterReceiverAutoSusp = SPI_MASTER_RX_AUTOSUSP_DISABLE;  
hspi2.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_ENABLE;   
hspi2.Init.IOSwap = SPI_IO_SWAP_DISABLE;  
if (HAL_SPI_Init(&hspi2) != HAL_OK)   {     Error_Handler();   }

阿侑kevin

32位转8位后发送，发送4个字节

xuande

上示波器，看看波形对不对。

soldier89757

用逻辑分析仪看看波形