STM32 DMA传输错误

Question

我使用 STM32F407VTG6 控制器并尝试使用 DMA 从 SPI 接收数据。然后我想处理 DMA Complete Transfer Interrupt 上的数据。但是当发生完全传输中断时，我看到设置了 TEIF（传输错误中断标志）。在此之后 DMA 无法启动。这是我的代码的一部分：

static void DmaInit()
{
 DMA_InitTypeDef dma;

 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

 // DMA for Rx
 dma.DMA_Channel = DMA_Channel_3;
 dma.DMA_PeripheralBaseAddr = (uint32_t)&SPI1->DR;
 dma.DMA_Memory0BaseAddr = 0; // will be set later
 dma.DMA_DIR = DMA_DIR_PeripheralToMemory;
 dma.DMA_BufferSize = 1; // will be set later
 dma.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
 dma.DMA_MemoryInc = DMA_MemoryInc_Enable;
 dma.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
 dma.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
 dma.DMA_Mode = DMA_Mode_Normal;
 dma.DMA_Priority = DMA_Priority_High;
 dma.DMA_FIFOMode = DMA_FIFOMode_Disable;
 dma.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
 dma.DMA_MemoryBurst = DMA_MemoryBurst_Single;
 dma.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
 DMA_DeInit(DMA2_Stream2);
 DMA_Init(DMA2_Stream2, &dma);

 // Enable DMA Interrupt on complete transfer
 NVIC_EnableIRQ(DMA2_Stream2_IRQn);
 DMA_ITConfig(DMA2_Stream2, DMA_IT_TC, ENABLE);
}

// It run on external interrupt
static void DmaStart(uint32_t bufferSize, uint32_t* rxBuffer)
{ 
 // Start DMA for reading
 DMA2_Stream2->NDTR = bufferSize;
 DMA2_Stream2->M0AR = (uint32_t)rxBuffer;
 DMA_Cmd(DMA2_Stream2, ENABLE);
}

static void SpiInit()
{
  SPI_InitTypeDef spi;

  // Enable clock for SPI
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

  // SPI settings
  SPI_StructInit(&spi);
  spi.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  spi.SPI_Mode = SPI_Mode_Master;
  spi.SPI_DataSize = SPI_DataSize_8b;
  spi.SPI_CPOL = SPI_CPOL_Low;
  spi.SPI_CPHA = SPI_CPHA_2Edge;
  spi.SPI_NSS = SPI_NSS_Soft;
  spi.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
  spi.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_Init(SPI1, &spi);
  SPI_Cmd(SPI1, ENABLE);

  SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE);
}

Answer 1

这几天我刚刚完成了我的 SDIO+DMA，一些笔记可能对你有用：

1. 在启用流之前清除标志

   DMA_ClearFlag(DMA2_Stream2, DMA_FLAG_FEIF2|DMA_FLAG_DMEIF2|DMA_FLAG_TEIF2|DMA_FLAG_HTIF2|DMA_FLAG_TCIF2);
   

2. 清除 DMA_SxCR 寄存器中的 EN 位，等到 DMA_Init() 之前 EN 位被读取为 0

   DMA_Cmd(DMA2_Stream2, DISABLE);
   while (DMA2_Stream2->CR & DMA_SxCR_EN);
   

3. 当使用DMA_FIFOMode_Disable（直接模式）时，数据宽度由DMA_PeripheralDataSize（PSIZE）决定，DMA_MemoryDataSize（MSIZE）被忽略

4. 内存地址必须与您选择的数据宽度（HalfWord）对齐

参考：

1. STM32F407XX Reference Manual - 第 10 章 DMA 控制器
2. STM32F4XX 标准外设库