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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); } |
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DMA_InitStructure.DMA_MemoryDataSize =DMA_MemoryDataSize_HalfWord
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换言之，你怎么判断的？
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