开发测试环境

STM32型号：stm32F401RC
I2S芯片：ES7243
stm32cubeMX 版本：

cubeMX配置方法

1，配置I2S模块；我的是录音模块，所以master RX模式；

1.1 I2S的参数需要根据I2S芯片特性和用户需要来配置。比如通信标准，数据格式和音频采样率…

1.2 DMA 配置

2，配置时钟树。
2.1 mcu使用外部晶振。

I2S 的有些引脚可以灵活选择；我用的硬件

点击生成keil5工程；

修改固件

1，修改stm32f4xx_hal_i2s.c

1，修改函数名为HAL_I2S_Receive_DMA_modiy，增加一个buffer，与已有的buffer形成双缓冲。
2，将函数中的HAL_DMA_Start_IT用DMA双缓冲中断启动函数HAL_DMAEx_MultiBufferStart_IT替换

HAL_StatusTypeDef HAL_I2S_Receive_DMA(I2S_HandleTypeDef *hi2s, uint16_t *pData, uint16_t Size){}
HAL_StatusTypeDef HAL_I2S_Receive_DMA_modiy(I2S_HandleTypeDef *hi2s, uint16_t *pData,uint16_t *pData2, uint16_t Size)
{uint32_t tmpreg_cfgr;if ((pData == NULL) || (Size == 0U)){return  HAL_ERROR;}/* Process Locked */__HAL_LOCK(hi2s);if (hi2s->State != HAL_I2S_STATE_READY){__HAL_UNLOCK(hi2s);return HAL_BUSY;}/* Set state and reset error code */hi2s->State = HAL_I2S_STATE_BUSY_RX;hi2s->ErrorCode = HAL_I2S_ERROR_NONE;hi2s->pRxBuffPtr = pData;tmpreg_cfgr = hi2s->Instance->I2SCFGR & (SPI_I2SCFGR_DATLEN | SPI_I2SCFGR_CHLEN);if ((tmpreg_cfgr == I2S_DATAFORMAT_24B) || (tmpreg_cfgr == I2S_DATAFORMAT_32B)){hi2s->RxXferSize = (Size << 1U);hi2s->RxXferCount = (Size << 1U);}else{hi2s->RxXferSize = Size;hi2s->RxXferCount = Size;}/* Set the I2S Rx DMA Half transfer complete callback */hi2s->hdmarx->XferHalfCpltCallback = I2S_DMARxHalfCplt;/* Set the I2S Rx DMA transfer complete callback */hi2s->hdmarx->XferCpltCallback = I2S_DMARxCplt;/* Set the DMA error callback */hi2s->hdmarx->XferErrorCallback = I2S_DMAError;/* Check if Master Receiver mode is selected */if ((hi2s->Instance->I2SCFGR & SPI_I2SCFGR_I2SCFG) == I2S_MODE_MASTER_RX){/* Clear the Overrun Flag by a read operation to the SPI_DR register followed by a readaccess to the SPI_SR register. */__HAL_I2S_CLEAR_OVRFLAG(hi2s);}/* Enable the Rx DMA Stream/Channel */
//  if (HAL_OK != HAL_DMA_Start_IT(hi2s->hdmarx, (uint32_t)&hi2s->Instance->DR, (uint32_t)hi2s->pRxBuffPtr,
//                                 hi2s->RxXferSize))if (HAL_OK != HAL_DMAEx_MultiBufferStart_IT(hi2s->hdmarx, (uint32_t)&hi2s->Instance->DR, (uint32_t)hi2s->pRxBuffPtr,(uint32_t)pData2,hi2s->RxXferSize)) {/* Update SPI error code */SET_BIT(hi2s->ErrorCode, HAL_I2S_ERROR_DMA);hi2s->State = HAL_I2S_STATE_READY;__HAL_UNLOCK(hi2s);return HAL_ERROR;}/* Check if the I2S is already enabled */if (HAL_IS_BIT_CLR(hi2s->Instance->I2SCFGR, SPI_I2SCFGR_I2SE)){/* Enable I2S peripheral */__HAL_I2S_ENABLE(hi2s);}/* Check if the I2S Rx request is already enabled */if (HAL_IS_BIT_CLR(hi2s->Instance->CR2, SPI_CR2_RXDMAEN)){/* Enable Rx DMA Request */SET_BIT(hi2s->Instance->CR2, SPI_CR2_RXDMAEN);}__HAL_UNLOCK(hi2s);return HAL_OK;
}

2，修改stm32f4xx_hal_dma_ex.c

2.1 在函数HAL_DMAEx_MultiBufferStart_IT 增加如下函数指针的实例：
/* Current memory buffer used is Memory 1 callback /
hdma->XferCpltCallback = dma_m0_rxcplt_callback; //第一个缓冲区填满后会调用这个函数
/ Current memory buffer used is Memory 0 callback */
hdma->XferM1CpltCallback = dma_m1_rxcplt_callback; //第二个缓冲区填满后会调用这个函数
hdma->XferErrorCallback = XferErrorCallback_app;

2.2. 在函数外增加这3个函数的具体实现；
中断发生后可以在dma_m0_rxcplt_callback，dma_m1_rxcplt_callback中复制I2S DMA数据到用户区用户后续处理。

HAL_StatusTypeDef HAL_DMAEx_MultiBufferStart_IT(DMA_HandleTypeDef *hdma, uint32_t SrcAddress, uint32_t DstAddress, uint32_t SecondMemAddress, uint32_t DataLength)
{HAL_StatusTypeDef status = HAL_OK;/* Check the parameters */assert_param(IS_DMA_BUFFER_SIZE(DataLength));/* Memory-to-memory transfer not supported in double buffering mode */if (hdma->Init.Direction == DMA_MEMORY_TO_MEMORY){hdma->ErrorCode = HAL_DMA_ERROR_NOT_SUPPORTED;return HAL_ERROR;}/* Current memory buffer used is Memory 1 callback */hdma->XferCpltCallback   = dma_m0_rxcplt_callback; //第一个缓冲区填满后会调用这个函数/* Current memory buffer used is Memory 0 callback */hdma->XferM1CpltCallback = dma_m1_rxcplt_callback; //第二个缓冲区填满后会调用这个函数hdma->XferErrorCallback = XferErrorCallback_app;  /* Check callback functions */if ((NULL == hdma->XferCpltCallback) || (NULL == hdma->XferM1CpltCallback) || (NULL == hdma->XferErrorCallback)){hdma->ErrorCode = HAL_DMA_ERROR_PARAM;return HAL_ERROR;}/* Process locked */__HAL_LOCK(hdma);if(HAL_DMA_STATE_READY == hdma->State){/* Change DMA peripheral state */hdma->State = HAL_DMA_STATE_BUSY;/* Initialize the error code */hdma->ErrorCode = HAL_DMA_ERROR_NONE;/* Enable the Double buffer mode */hdma->Instance->CR |= (uint32_t)DMA_SxCR_DBM;/* Configure DMA Stream destination address */hdma->Instance->M1AR = SecondMemAddress;/* Configure the source, destination address and the data length */DMA_MultiBufferSetConfig(hdma, SrcAddress, DstAddress, DataLength); /* Clear all flags */__HAL_DMA_CLEAR_FLAG (hdma, __HAL_DMA_GET_TC_FLAG_INDEX(hdma));__HAL_DMA_CLEAR_FLAG (hdma, __HAL_DMA_GET_HT_FLAG_INDEX(hdma));__HAL_DMA_CLEAR_FLAG (hdma, __HAL_DMA_GET_TE_FLAG_INDEX(hdma));__HAL_DMA_CLEAR_FLAG (hdma, __HAL_DMA_GET_DME_FLAG_INDEX(hdma));__HAL_DMA_CLEAR_FLAG (hdma, __HAL_DMA_GET_FE_FLAG_INDEX(hdma));/* Enable Common interrupts*/hdma->Instance->CR  |= DMA_IT_TC | DMA_IT_TE | DMA_IT_DME;hdma->Instance->FCR |= DMA_IT_FE;if((hdma->XferHalfCpltCallback != NULL) || (hdma->XferM1HalfCpltCallback != NULL)){hdma->Instance->CR  |= DMA_IT_HT;}/* Enable the peripheral */__HAL_DMA_ENABLE(hdma); }else{     /* Process unlocked */__HAL_UNLOCK(hdma);      /* Return error status */status = HAL_BUSY;}  return status;
}

3，在MX_I2S_Init函数里增加

i2S使能；DMA双缓冲配置和使能DMA中断；

static void MX_I2S3_Init(void)
{/* USER CODE BEGIN I2S3_Init 0 *//* USER CODE END I2S3_Init 0 *//* USER CODE BEGIN I2S3_Init 1 *//* USER CODE END I2S3_Init 1 */hi2s3.Instance = SPI3;hi2s3.Init.Mode = I2S_MODE_MASTER_RX;hi2s3.Init.Standard = I2S_STANDARD_PHILIPS;hi2s3.Init.DataFormat = I2S_DATAFORMAT_16B;hi2s3.Init.MCLKOutput = I2S_MCLKOUTPUT_ENABLE;hi2s3.Init.AudioFreq = I2S_AUDIOFREQ_16K;hi2s3.Init.CPOL = I2S_CPOL_HIGH;hi2s3.Init.ClockSource = I2S_CLOCK_PLL;hi2s3.Init.FullDuplexMode = I2S_FULLDUPLEXMODE_DISABLE;if (HAL_I2S_Init(&hi2s3) != HAL_OK){Error_Handler();}/* USER CODE BEGIN I2S3_Init 2 *///HAL_I2S_Init  include  HAL_I2S_MspInit(hi2s);__HAL_I2S_ENABLE(&hi2s3);                 //使能I2S2    __HAL_DMA_DISABLE(&hdma_spi3_rx); HAL_I2S_Receive_DMA_modiy(&hi2s3,(uint16_t*)test_333[0],(uint16_t*)test_333[1],128);__HAL_DMA_ENABLE(&hdma_spi3_rx); __HAL_DMA_ENABLE_IT(&hdma_spi3_rx,DMA_IT_TC|DMA_IT_DME);                     //开启传输完成中断      /* USER CODE END I2S3_Init 2 */}

4，测试

编译通过后下载跟踪，可以看到test_333[1]，test_333[0]的内存交替刷新。 DMA 中断服务程序dma_m0_rxcplt_callback，dma_m1_rxcplt_callback中的变量在不断增加.
DMA 双缓冲OK！！！

后续将实现：1，将采集到的语音通过usb传到pc，做成usb microphone。
2，通过5.8G无线模块发送到dongle。

测试通过的固件： https://download.csdn.net/download/weixin_43336331/13218938

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