Stm32怎么用DMA中断方式实现SPI接收发送

在 STM32 中使用 DMA 中断方式实现 SPI 接收和发送，可以通过以下步骤进行操作：

1. 配置 SPI 接口参数，包括时钟极性、相位、数据位数等。

2. 配置 DMA 控制器，使其能够通过 SPI 接口进行数据传输。需要设置 DMA 控制器的源地址、目的地址、数据长度等参数。

3. 在 SPI 接口中开启 DMA 模式，并设置相应的 DMA 通道和传输方向（发送或接收）。

4. 在 DMA 模式下，当数据传输完成时，DMA 控制器会产生中断，此时可以在中断服务函数中进行相应的处理。

下面是一个实现 SPI 接收发送的示例代码（仅供参考）：

#include "stm32f10x.h"

#define BUFFER_SIZE 10

uint8_t TxBuffer[BUFFER_SIZE] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A};
uint8_t RxBuffer[BUFFER_SIZE];

void SPI1_DMA_Config(void)
{
  DMA_InitTypeDef DMA_InitStructure;
  SPI_InitTypeDef SPI_InitStructure;

  /* Enable DMA1 clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

  /* Enable SPI1 clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

  /* Configure SPI1 pins */
  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure DMA1 Channel2, DMA1 Channel3 */
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) &(SPI1->DR);
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) RxBuffer;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = BUFFER_SIZE;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel2, &DMA_InitStructure);

  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) &(SPI1->DR);
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) TxBuffer;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = BUFFER_SIZE;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel3, &DMA_InitStructure);

  /* Configure SPI1 */
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI1, &SPI_InitStructure);

  /* Enable DMA RX Channel */
  SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE);
  DMA_Cmd(DMA1_Channel2, ENABLE);

  /* Enable DMA TX Channel */
  SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);
  DMA_Cmd(DMA1_Channel3, ENABLE);

  /* Enable SPI1 */
  SPI_Cmd(SPI1, ENABLE);
}

void DMA1_Channel2_IRQHandler(void)
{
  if (DMA_GetITStatus(DMA1_IT_TC2))
  {
    /* Disable DMA RX Channel */
    DMA_Cmd(DMA1_Channel2, DISABLE);

    /* Clear DMA RX Transfer Complete Flag */
    DMA_ClearITPendingBit(DMA1_IT_TC2);
  }
}

void DMA1_Channel3_IRQHandler(void)
{
  if (DMA_GetITStatus(DMA1_IT_TC3))
  {
    /* Disable DMA TX Channel */
    DMA_Cmd(DMA1_Channel3, DISABLE);

    /* Clear DMA TX Transfer Complete Flag */
    DMA_ClearITPendingBit(DMA1_IT_TC3);
  }
}

int main(void)
{
  /* Configure SPI1 and DMA */
  SPI1_DMA_Config();

  while (1)
  {
    /* Wait for DMA TX and RX to complete */
    while (DMA_GetFlagStatus(DMA1_FLAG_TC2) == RESET && DMA_GetFlagStatus(DMA1_FLAG_TC3) == RESET);

    /* Clear DMA TX and RX Transfer Complete Flags */
    DMA_ClearFlag(DMA1_FLAG_TC2 | DMA1_FLAG_TC3);

    /* Do something with received data in RxBuffer */
    /* ... */

    /* Reset TxBuffer */
    for (uint8_t i = 0; i < BUFFER_SIZE; i++)
    {
      TxBuffer[i] = i;
    }

    /* Enable DMA TX Channel */
    DMA_Cmd(DMA1_Channel3, ENABLE);
  }
}

在上面的代码中，DMA1_Channel2 和 DMA1_Channel3 分别用于 SPI 接收和发送。当 DMA 传输完成时，会触发中断函数 DMA1_Channel2_IRQHandler 和 DMA1_Channel3_IRQHandler，在这里可以进行相应的处理。注意在中断服务函数中需要清除相应的中断标志位。