i2s半双工模式，使用dma读取数据

ruyinanhai 提问时间：2018-5-17 12:29 /

i2s半双工模式，dma读取数据，使用dma的哪个通道？
为什么我配置的是数据流3的通道0（DMA1_Stream 3_Channel 0），但是触发中断时却是DMA1_Stream 3_Channel 3触发传输完成中断，DMA1_Stream 3_Channel 0一直没有触发传输完成中断？
程序并没有配置DMA1_Stream 3_Channel 3，但是DMA1_Stream 3_Channel 3触发的时间间隔还是正确的，数据也通过DMA1_Stream 3_Channel 3传输成功了？

程序如下：
void  Mic_Init(void)
{
/*定义结构体变量*/
GPIO_InitTypeDef       GPIO_InitStructure;
I2S_InitTypeDef       I2S_InitStructure;
DMA_InitTypeDef       DMA_InitStructure;
NVIC_InitTypeDef       NVIC_InitStructure;

/*配置时钟*/
RCC_I2SCLKConfig(RCC_I2S2CLKSource_PLLI2S);
RCC_PLLI2SCmd(ENABLE);
RCC_GetFlagStatus(RCC_FLAG_PLLI2SRDY);

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);                            /*使能GPIOA时钟*/
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);                            /*使能SPI2时钟*/
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);                            /*使能DMA1时钟*/

/*************************************************************************************************************/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//普通输出模式
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;//上拉
GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化

//SCK -> PB13
GPIO_InitStructure.GPIO_Mode =  GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_Init( GPIOB , &GPIO_InitStructure );
GPIO_PinAFConfig( GPIOB , GPIO_PinSource13 , GPIO_AF_SPI2 );

//SD -> PB15
GPIO_InitStructure.GPIO_Mode =  GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
GPIO_Init( GPIOB , &GPIO_InitStructure );
GPIO_PinAFConfig( GPIOB , GPIO_PinSource15 , GPIO_AF_SPI2 );

//WS -> PB12
GPIO_InitStructure.GPIO_Mode =  GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_Init( GPIOB , &GPIO_InitStructure );
GPIO_PinAFConfig( GPIOB , GPIO_PinSource12 , GPIO_AF_SPI2 );

MIC_EN = 0;

/*************************************************************************************************************/
/*复位TIM2*/
SPI_I2S_DeInit(SPI2);

I2S_InitStructure.I2S_AudioFreq = REC_FREQ;
I2S_InitStructure.I2S_Standard = I2S_Standard_Phillips;
I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_24b;
I2S_InitStructure.I2S_CPOL = I2S_CPOL_High;
I2S_InitStructure.I2S_Mode = I2S_Mode_MasterRx;
I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Disable;
I2S_Init(SPI2, &I2S_InitStructure);

SPI_I2S_DMACmd(SPI2,SPI_I2S_DMAReq_Rx,ENABLE);//SPI2 TX DMA请求使能.

I2S_Cmd(SPI2, ENABLE);
/*************************************************************************************************************/
/*复位 DMA1 数据流4*/
DMA_DeInit(DMA1_Stream3);

/*初始化 DMA1 数据流3 寄存器*/
DMA_InitStructure.DMA_Channel          = DMA_Channel_0;                         /*DMA2 数据流0 通道0*/
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(SPI2->DR);                /*ADC数据存储地址*/
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)mic_result1;                /*内存地址*/
DMA_InitStructure.DMA_DIR             = DMA_DIR_PeripheralToMemory;             /*传输方向是从外设到内存*/
DMA_InitStructure.DMA_BufferSize       = REC_DATA;                               /*每次数据传输的数量*/
DMA_InitStructure.DMA_PeripheralInc    = DMA_PeripheralInc_Disable;             /*ADC数据存储地址不增加*/
DMA_InitStructure.DMA_MemoryInc       = DMA_MemoryInc_Enable;                   /*内存地址增加*/
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;       /*ADC数据长度半字，两个字节*/
DMA_InitStructure.DMA_MemoryDataSize    = DMA_MemoryDataSize_HalfWord;          /*内存数据长度半字，两个字节*/
DMA_InitStructure.DMA_Mode             = DMA_Mode_Circular;                      /*循环模式*/
DMA_InitStructure.DMA_Priority          = DMA_Priority_VeryHigh;                      /*高优先级*/
DMA_InitStructure.DMA_FIFOMode          = DMA_FIFOMode_Disable;                   /*禁止FIFO*/
DMA_InitStructure.DMA_FIFOThreshold    = DMA_FIFOThreshold_HalfFull;             /*FIFO的阈值*///?
DMA_InitStructure.DMA_MemoryBurst       = DMA_MemoryBurst_Single;                /*单次传输*///?
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;             /*单次传输*///?
DMA_Init(DMA1_Stream3,&DMA_InitStructure);                                        /*初始化*/

NVIC_InitStructure.NVIC_IRQChannel                = DMA1_Stream3_IRQn;          /*DMA2 数据流0中断*/
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;                         /*抢占优先级为0*/
NVIC_InitStructure.NVIC_IRQChannelSubPriority       = 0;                         /*子优先级为0*/
NVIC_InitStructure.NVIC_IRQChannelCmd             = ENABLE;                   /*中断使能*/
NVIC_Init(&NVIC_InitStructure);

/*初始化 DMA2 数据流0 的双缓存模式，DMA_Memory_0首先被传输*/
DMA_DoubleBufferModeConfig(DMA1_Stream3,(uint32_t)mic_result2,DMA_Memory_0);

/*使能 DMA2 数据流0 的双缓存模式*/
DMA_DoubleBufferModeCmd(DMA1_Stream3,ENABLE);

/*使能 DMA2 数据流0 的传输完成中断*/
DMA_ITConfig( DMA1_Stream3, DMA_IT_TC, ENABLE );

/*清楚中断标志位*/
DMA_ClearITPendingBit ( DMA1_Stream3, DMA_IT_TCIF0 );

/*开启DMA传输*/
DMA_Cmd(DMA1_Stream3,ENABLE);
}