DMA的数据采集问题

DMA_InitTypeDef  DMA_InitStructure;                //DMA配置初始化结构体

  

        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);        //开启DMA2时钟  

        



        /* 配置DMA1的Channel3 stream0，        用于接收ADC的SPI传输数据 */



        DMA_DeInit(DMA2_Stream0);        //复位DMA2的Stream0的寄存器到复位默认状态 



        /* 在使能DMA Stream前检查其是否被禁用，这一步非常重要当Stream用于其它复用时：启用、禁用、再

           启用禁用，这种情况下DMA的Stream禁用将会影响到正在传输的数据，而且在再次使能前不能正确配置

           被硬件清除的位，如果Streanm只被使用一次，这个步骤可以省略跳过        */

        while (DMA_GetCmdStatus(DMA2_Stream0) != DISABLE);  

        

        DMA_InitStructure.DMA_Channel = DMA_Channel_3;                                                //选择通道3 

        DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32)(&(SPI1->DR));                //SPI1_BASE+0x0c寄存器地址,(uint32_t)(SPI1_BASE+0x0c)

        DMA_InitStructure.DMA_Memory0BaseAddr = (uint32)ADC_RX_BUFFER;                //SPI接收ADC的数据地址

        DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;                                //外设到内存

        DMA_InitStructure.DMA_BufferSize = (uint32)(ADC_RX_BUFFER_SIZE * 3);        //DMA的接收缓冲区大小

        DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;        //外设地址不增加

        DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                                //内存地址增加

        DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;        //外设按照字节传输

        DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;                        //内存按照字节传输

        DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;                        //正常模式，非循环读取

        DMA_InitStructure.DMA_Priority = DMA_Priority_High;                //优先级高

        DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;        //关闭FIFO模式        

        DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;

        DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;

        DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

        DMA_Init(DMA2_Stream0, &DMA_InitStructure);                //配置DMA及Stream0并初始化

    

        /*        配置DMA2、通道3、stream0传输完成产生中断 

        **        DMA_IT_TC        传输完成产生DMA中断

        **        DMA_IT_HT        传输一半产生DMA中断

        **        DMA_IT_TE        传输错误产生DMA中断 

        **        DMA_IT_DME

        **        DMA_IT_FE        FIFO传输错误*/        

        DMA_ITConfig(DMA2_Stream0, DMA_IT_TC, ENABLE);        

        DMA_Cmd(DMA2_Stream0, DISABLE);                                        //先关闭DMA2_Stream0

  

        /* 配置DMA2、channel3、stream0中断向量表 */

        NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;

        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

        NVIC_Init(&NVIC_InitStructure);     





        /* 配置DMA2 channe3 stream3 SPI的数据发送 */

        DMA_DeInit(DMA2_Stream3);        //复位DMA2的Stream0的寄存器到复位默认状态



    while ( DMA_GetCmdStatus(DMA2_Stream3) != DISABLE);



    DMA_InitStructure.DMA_Channel = DMA_Channel_3;

    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32)(&(SPI1->DR));        //SPI->DR寄存器地址

    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32)ADC_TX_BUFFER;                //ADC发送数据起始地址

    DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;                                //内存到外设

    DMA_InitStructure.DMA_BufferSize = (uint32)ADC_TX_BUFFER_SIZE;                //DMA发送缓冲区大小

    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;        //外设地址不增加

    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                                //内存地址增加

    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;        //外设字节传输

    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;                        //内存字节传输

    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;

    DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;

    DMA_InitStructure.DMA_FIFOMode =DMA_FIFOMode_Disable;

    DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;

    DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;

    DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;



    DMA_Init(DMA2_Stream3, &DMA_InitStructure);                //配置DMA的Stream3并初始化                

    DMA_ITConfig(DMA2_Stream3, DMA_IT_TC, ENABLE);        //配置DMA传输完成产生中断

    DMA_Cmd(DMA2_Stream3, DISABLE);                                        //先关闭DMA的Stream3



        /* 配置DMA2 channe3 stream3的中断向量 */

    NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream3_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);          

DMA_Cmd(DMA2_Stream3, DISABLE);                

    DMA_SetCurrDataCounter(DMA2_Stream3, ADC_TX_BUFFER_SIZE);