请教STM32 I2S从设备DMA接收输出全为0问题

whxiao王

配置代码如下 GPIO_InitTypeDef  GPIO_InitStructure;   I2S_InitTypeDef   I2S_InitStructure;   DMA_InitTypeDef   DMA_InitStructure;      RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_15 ;//I2SWS?I2SCK?I2SSD   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;   GPIO_Init(GPIOB, &GPIO_InitStructure);      RCC_APB1PeriphClockCmd( RCC_APB1Periph_SPI2, ENABLE);      /* CODEC_I2S peripheral configuration */   SPI_I2S_DeInit( SPI2 );   I2S_InitStructure.I2S_AudioFreq = I2S_AudioFreq_8k;   I2S_InitStructure.I2S_Standard = I2S_Standard_PCMShort;   I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b;   I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;   I2S_InitStructure.I2S_Mode = I2S_Mode_SlaveRx;   I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Disable;   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);       DMA_DeInit(DMA1_Channel4);   DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&SPI2->DR);   DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)DMA_Rx_Buffer;   DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;   DMA_InitStructure.DMA_BufferSize = APP_RX_DATA_SIZE;   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_Normal;   DMA_InitStructure.DMA_Priority = DMA_Priority_High;   DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;   DMA_Init(DMA1_Channel4, &DMA_InitStructure);   DMA_Cmd(DMA1_Channel4, ENABLE);   SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Rx, ENABLE);   I2S_Init( SPI2, &I2S_InitStructure );   I2S_Cmd( SPI2, ENABLE );

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