H7 HAL库配置的SPI DMA 全双工，读到的数据是0

bjdj0000 提问时间：2018-10-6 15:45 /

问答
是否解决:

本帖最后由 bjdj0000 于 2018-10-8 00:05 编辑

配置如下，读写W25Q128

void MX_SPI1_TxRx_DMA_Init(void)
{
      MX_GPIO_Init();
      /* Set the SPI parameters */
  SpiHandle.Instance             = SPIx;
SpiHandle.Init.Mode             = SPI_MODE_MASTER;
  SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_8;
  SpiHandle.Init.Direction       = SPI_DIRECTION_2LINES;
  SpiHandle.Init.CLKPhase       = SPI_PHASE_1EDGE;
  SpiHandle.Init.CLKPolarity    = SPI_POLARITY_LOW;
  SpiHandle.Init.DataSize       = SPI_DATASIZE_8BIT;
  SpiHandle.Init.FirstBit       = SPI_FIRSTBIT_MSB;
  SpiHandle.Init.TIMode          = SPI_TIMODE_DISABLE;
  SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  SpiHandle.Init.CRCPolynomial    = 7;
  SpiHandle.Init.CRCLength       = SPI_CRC_LENGTH_8BIT;
  SpiHandle.Init.NSS             = SPI_NSS_SOFT;
  SpiHandle.Init.NSSPMode       = SPI_NSS_PULSE_DISABLE;
  SpiHandle.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_ENABLE;  /* Recommanded setting to avoid glitches */
      if(HAL_SPI_Init(&SpiHandle) != HAL_OK)
  {
/* Initialization Error */
printf("初始化失败!\n");
  }
}

static void MX_GPIO_Init(void)
{

  GPIO_InitTypeDef GPIO_InitStruct;

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET);

  /*Configure GPIO pin : PA4 */
  GPIO_InitStruct.Pin = GPIO_PIN_4;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

}

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

  if (hspi->Instance == SPIx)
  {
/*##-1- Enable peripherals and GPIO Clocks #################################*/
/* Enable GPIO TX/RX clock */
SPIx_SCK_GPIO_CLK_ENABLE();
SPIx_MISO_GPIO_CLK_ENABLE();
SPIx_MOSI_GPIO_CLK_ENABLE();
/* Enable SPI1 clock */
SPIx_CLK_ENABLE();
/* Enable DMA clock */
DMAx_CLK_ENABLE();

/*##-2- Configure peripheral GPIO ##########################################*/
/* 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_FREQ_HIGH;
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.Alternate = SPIx_MISO_AF;
HAL_GPIO_Init(SPIx_MISO_GPIO_PORT, &GPIO_InitStruct);

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

/*##-3- Configure the DMA ##################################################*/
/* Configure the DMA handler for Transmission process */
hdma_tx.Instance                = SPIx_TX_DMA_STREAM;
hdma_tx.Init.FIFOMode          = DMA_FIFOMODE_DISABLE;
hdma_tx.Init.FIFOThreshold    = DMA_FIFO_THRESHOLD_FULL;
hdma_tx.Init.MemBurst          = DMA_MBURST_INC4;
hdma_tx.Init.PeriphBurst       = DMA_PBURST_INC4;
hdma_tx.Init.Request          = SPIx_TX_DMA_REQUEST;
hdma_tx.Init.Direction          = DMA_MEMORY_TO_PERIPH;
hdma_tx.Init.PeriphInc          = DMA_PINC_DISABLE;
hdma_tx.Init.MemInc             = DMA_MINC_ENABLE;
hdma_tx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_tx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_tx.Init.Mode             = DMA_NORMAL;
hdma_tx.Init.Priority          = DMA_PRIORITY_VERY_HIGH;

HAL_DMA_Init(&hdma_tx);

/* Associate the initialized DMA handle to the the SPI handle */
__HAL_LINKDMA(hspi, hdmatx, hdma_tx);

/* Configure the DMA handler for Transmission process */
hdma_rx.Instance                = SPIx_RX_DMA_STREAM;

hdma_rx.Init.FIFOMode          = DMA_FIFOMODE_DISABLE;
hdma_rx.Init.FIFOThreshold    = DMA_FIFO_THRESHOLD_FULL;
hdma_rx.Init.MemBurst          = DMA_MBURST_INC4;
hdma_rx.Init.PeriphBurst       = DMA_PBURST_INC4;
hdma_rx.Init.Request          = SPIx_RX_DMA_REQUEST;
hdma_rx.Init.Direction          = DMA_PERIPH_TO_MEMORY;
hdma_rx.Init.PeriphInc          = DMA_PINC_DISABLE;
hdma_rx.Init.MemInc             = DMA_MINC_ENABLE;
hdma_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_rx.Init.Mode             = DMA_NORMAL;
hdma_rx.Init.Priority          = DMA_PRIORITY_VERY_HIGH;

HAL_DMA_Init(&hdma_rx);

/* Associate the initialized DMA handle to the the SPI handle */
__HAL_LINKDMA(hspi, hdmarx, hdma_rx);

/*##-4- Configure the NVIC for DMA #########################################*/
/* NVIC configuration for DMA transfer complete interrupt (SPI1_TX) */
HAL_NVIC_SetPriority(SPIx_DMA_TX_IRQn, 1, 1);
HAL_NVIC_EnableIRQ(SPIx_DMA_TX_IRQn);

/* NVIC configuration for DMA transfer complete interrupt (SPI1_RX) */
HAL_NVIC_SetPriority(SPIx_DMA_RX_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(SPIx_DMA_RX_IRQn);

/*##-5- Configure the NVIC for SPI #########################################*/
/* NVIC configuration for SPI transfer complete interrupt (SPI1) */
HAL_NVIC_SetPriority(SPIx_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(SPIx_IRQn);
  }
}