stm32f4 DMA配置问题

白马非马-403930 提问时间：2016-3-29 18:22 /

使用了两个DMA实现I2S接收24位音频数据、通过串口发送该数据
但是接收和发送的数据都有问题，DMA配置代码如下：
/*定义中断和DMA配置变量*/
  NVIC_InitTypeDef NVIC_InitStructure;
  DMA_InitTypeDef  DMA_InitStructure;
  /* Enable DMA clock */
  RCC_AHB1PeriphClockCmd(DMA_STREAM_CLOCK, ENABLE);
  /* Reset DMA Stream registers (for debug purpose) */
  DMA_DeInit(DMA_STREAM);
  /* Check if the DMA Stream is disabled before enabling it.*/
  while (DMA_GetCmdStatus(DMA_STREAM) != DISABLE)
  {
  }
  /*清空STREAM上所有中断标志，（见main.h，DMA_STREAM==DMA1_Stream2）*/
  DMA_ClearITPendingBit(DMA_STREAM,DMA_IT_FEIF2|DMA_IT_DMEIF2|DMA_IT_TEIF2|DMA_IT_HTIF2|DMA_IT_TCIF2);
  /* Configure DMA Stream */
  DMA_InitStructure.DMA_Channel = DMA_CHANNEL;                            /*DMA1 数据流2 通道0 SPI3RX*/
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&I2Sx->DR;       /*外设地址是I2S3的数据寄存器*/
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&buf0;             /*存放DMA数据的内存地址*/
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;                /*传输方向外设到存储器*/
  DMA_InitStructure.DMA_BufferSize = (uint32_t)BUFFER_SIZE;             /*数据传输量*/
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;       /*外设非增量模式，即外设地址不会增加*/
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                /*存储器增量模式*/
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;  /*外设数据长度*/
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;       /*存储器数据长度*/
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;                         /*循环模式*/
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;                   /*优先级设为高*/
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;                /*不使用FIFO模式*/
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;          /*设置FIFO阈值，未开启，这里随便设无所谓*/
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;             /*储存器突发传输配置*/
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_INC4;    /*外设突发传输配置*/
  DMA_Init(DMA_STREAM, &DMA_InitStructure);                               /*初始化DMA数据流*/

  DMA_DoubleBufferModeConfig(DMA_STREAM,(uint32_t)&buf1,DMA_Memory_0);/*双缓冲模式配置*/
  DMA_DoubleBufferModeCmd(DMA_STREAM,ENABLE);                               /*双缓冲模式开启*/

  //串口DMA配置
  DMA_InitStructure.DMA_Channel = DMA_Channel_4;                            /*DMA1 数据流6 通道4 USART2TX*/
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART2->DR;       /*外设地址是I2S3的数据寄存器*/
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&buf0;             /*存放DMA数据的内存地址*/
  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;                /*传输方向存储器到外设*/
  DMA_InitStructure.DMA_BufferSize = (uint32_t)BUFFER_SIZE;             /*数据传输量*/
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;       /*外设非增量模式，即外设地址不会增加*/
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                /*存储器增量模式*/
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;  /*外设数据长度*/
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;       /*存储器数据长度*/
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;                         /*循环模式*/
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;                   /*优先级设为高*/
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;                /*不使用FIFO模式*/
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;          /*设置FIFO阈值，未开启，这里随便设无所谓*/
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_INC4;             /*储存器突发传输配置*/
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;    /*外设突发传输配置*/
  DMA_Init(DMA1_Stream6, &DMA_InitStructure);                               /*初始化DMA数据流*/

  DMA_DoubleBufferModeConfig(DMA1_Stream6,(uint32_t)&buf1,DMA_Memory_0);/*双缓冲模式配置*/
  DMA_DoubleBufferModeCmd(DMA1_Stream6,ENABLE);                               /*双缓冲模式开启*/

参考手册上关于接收24位I2S数据的说明：
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我理解的是I2S数据寄存器只有16位，需要读两次，那在配置DMA的时候外设数据长度PeripheralDataSize和存储器数据长度MemoryDataSize该怎么配置？还有单次传输和突发传输要怎么设置？

我应该怎么检测数据的完整性？原本想在串口DMA发送完成中断的时候通过串口发送数据包的编号，但是好像会产生冲突，数据都发不完。