st103芯片I2S数据DMA接收问题

只看该作者 · 2010-12-23 13:33

现在使用st103芯片对外设的音源进行录音，该音源的传输格式为I2S，使用DMA进行接收，但是在试验时，播放音源数据为正弦波时，DMA中的数据有时候对有时错（音源的波形没有变化），请问是怎么回事？困扰很久了，希望大牛们能帮忙解决，谢谢！
其中部分代码如下：

//  I2S
/* Configure SPI2 and SPI3 pins: CK, WS and SD */ //有两路录音数据，两个I2S通道接收
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_5 | GPIO_Pin_12
                              | GPIO_Pin_13 | GPIO_Pin_15;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

/*disable all*/
I2S_Cmd(SPI2, DISABLE);

  I2S_Cmd(SPI3, DISABLE);
  DMA_Cmd(DMA2_Channel1, DISABLE);

  DMA_Cmd(DMA1_Channel4, DISABLE);

/*config dma*/
DMA_DeInit(DMA1_Channel4);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)SPI2_DR_Address;
    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)RecordData_SBufferA;  存储数据的全局变量s16 RecordData_SBufferA[2048]
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize = RecordData_BufferLength;  2048
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA1_Channel4, &DMA_InitStructure);


  SPI_I2S_DeInit(SPI2);



//------------------I2S2 configuration----------------------------------//
  I2S_InitStructure.I2S_Mode = I2S_Mode_SlaveRx;
  I2S_InitStructure.I2S_Standard = I2S_Standard_Phillips;
  I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16bextended;
  I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Disable;
  I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_44k;
  I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;
  I2S_Init(SPI2, &I2S_InitStructure);


  // Enable SPI2 DMA Rx request /
  SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Rx, ENABLE);

  DMA_ClearFlag(DMA1_FLAG_TC4 | DMA1_FLAG_TE4 | DMA1_FLAG_HT4 | DMA1_FLAG_GL4);


  // Enable DMA1 Channel4 Transfer Complete interrupt /
  DMA_ITConfig(DMA1_Channel4, DMA_IT_TC, ENABLE);
  DMA_ITConfig(DMA1_Channel4, DMA_IT_HT, ENABLE);
  DMA_ITConfig(DMA1_Channel4, DMA_IT_TE, ENABLE);

/*another dma */
DMA_DeInit(DMA2_Channel1);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)SPI3_DR_Address;
    DMA_InitStructure.DMA_MemoryBaseAddr =(u32)RecordData_MBufferA;存储数据的全局变量s16 RecordData_MBufferA[2048]
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize = RecordData_BufferLength; 2048
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA2_Channel1, &DMA_InitStructure);

SPI_I2S_DeInit(SPI3);

  // I2S2 peripheral configuration /
  I2S_InitStructure.I2S_Mode = I2S_Mode_SlaveRx;
  I2S_InitStructure.I2S_Standard = I2S_Standard_Phillips;
  I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16bextended;
  I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Disable;
  I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_44k;
  I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;
  I2S_Init(SPI3, &I2S_InitStructure);

  /* Enable SPI3 DMA Rx request */
  SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Rx, ENABLE);

DMA_Cmd(DMA2_Channel1, ENABLE);

  DMA_Cmd(DMA1_Channel4, ENABLE);

  // Enable the SPI2/I2S2 peripheral /
I2S_Cmd(SPI2, ENABLE);
/* Enable the SPI3/I2S3 peripheral */
  I2S_Cmd(SPI3, ENABLE);

当开始播放正弦波时，RecordData_MBufferA的数据有时正确有时错误，请问是为什么？（I2S3的音源未打开）谢谢