使用H743的DFSDM+DMA采集IMD73D122硅麦PDM数据

DDDEAD · 发表于 3 天前

现在已经调通硅麦CLK和DATA线，H743程序也配置了DMA，使用DMA循环模式，中断正常可以触发。
当前问题：
当使用HAL_DFSDM_FilterRegularMsbStart_DMA()函数开启采集，DMA数据只有第1个字节有变化，其余为0；
当使用HAL_DFSDM_FilterRegularStart_DMA()函数开启采集，DMA数据全为0；
以上两个函数均可以进入到DMA半完成中断和全完成中断回调。

请问原因为何？

以下为代码：----------------------------------------------------------------------------------------------------------------------------
int16_t Buf_Mic0[4096] __attribute__((section(".ARM.__at_0x30020000")));DMA搬运音频数据存放的位置。RAM3.

void Start_Audio_Collection(void)//开启采集
{
      HAL_DFSDM_FilterRegularMsbStart_DMA(&haudio_in_dfsdm_filter,Buf_Mic0,4096);//这个函数只能读16bit，想读其余bit用不带Msb的此函数
//HAL_DFSDM_FilterRegularStart_DMA(&haudio_in_dfsdm_filter,Buf_Mic0,4096);

}

中断回调：

void HAL_DFSDM_FilterRegConvHalfCpltCallback(DFSDM_Filter_HandleTypeDef *hdfsdm_filter)//半完成
{
Set_Audio_Half_DMA_Finish(Now_TimeStampMS());
__HAL_DMA_CLEAR_FLAG(&hdma_dfsdm1_flt0,DMA_IT_DME);//清除DMA直接模式错误标记
__HAL_DMA_CLEAR_FLAG(&hdma_dfsdm1_flt0,DMA_IT_TE);//清除DMA传输错误标记
__HAL_DMA_ENABLE_IT(&hdma_dfsdm1_flt0,DMA_IT_HT);//开启DMA半传输中断
__HAL_DMA_ENABLE(&hdma_dfsdm1_flt0);
}

void HAL_DFSDM_FilterRegConvCpltCallback(DFSDM_Filter_HandleTypeDef *hdfsdm_filter)//全完成
{
Set_Audio_Full_DMA_Finish(Now_TimeStampMS());
__HAL_DMA_CLEAR_FLAG(&hdma_dfsdm1_flt0,DMA_IT_DME);//清除直接模式错误标记
__HAL_DMA_CLEAR_FLAG(&hdma_dfsdm1_flt0,DMA_IT_TE);//清除传输错误标记
__HAL_DMA_ENABLE_IT(&hdma_dfsdm1_flt0,DMA_IT_TC);//开启DMA传输完成中断
__HAL_DMA_ENABLE(&hdma_dfsdm1_flt0);
}

DFSDM_Filter配置：
{

  hDfsdmFilter->Instance                               = DFSDM1_Filter0;
  hDfsdmFilter->Init.RegularParam.Trigger       = DFSDM_FILTER_SW_TRIGGER;
  hDfsdmFilter->Init.RegularParam.FastMode    = ENABLE;
  hDfsdmFilter->Init.RegularParam.DmaMode       = ENABLE;
  hDfsdmFilter->Init.InjectedParam.DmaMode       = DISABLE;
  hDfsdmFilter->Init.FilterParam.SincOrder       = DFSDM_FILTER_SINC4_ORDER;
  hDfsdmFilter->Init.FilterParam.Oversampling    = 128;
  hDfsdmFilter->Init.FilterParam.IntOversampling  = 1;

}

DFSDM_Channel配置：
{

  hDfsdmChannel->Instance                   = DFSDM1_Channel0;
  hDfsdmChannel->Init.OutputClock.Activation = ENABLE;
  hDfsdmChannel->Init.OutputClock.Selection = DFSDM_CHANNEL_OUTPUT_CLOCK_AUDIO;
  hDfsdmChannel->Init.OutputClock.Divider    = 64;
  hDfsdmChannel->Init.Input.Multiplexer       = DFSDM_CHANNEL_EXTERNAL_INPUTS;
  hDfsdmChannel->Init.Input.DataPacking       = DFSDM_CHANNEL_STANDARD_MODE;
  hDfsdmChannel->Init.SerialInterface.SpiClock = DFSDM_CHANNEL_SPI_CLOCK_INTERNAL;
  hDfsdmChannel->Init.Awd.FilterOrder       = DFSDM_CHANNEL_FASTSINC_ORDER;
  hDfsdmChannel->Init.Awd.Oversampling       = 1;
  hDfsdmChannel->Init.Offset                = 0;
  hDfsdmChannel->Init.RightBitShift          = 0x00;//default0x05
  hDfsdmChannel->Init.Input.Pins             = DFSDM_CHANNEL_SAME_CHANNEL_PINS;
  hDfsdmChannel->Init.SerialInterface.Type    = DFSDM_CHANNEL_SPI_RISING;

}

Filter和Channel关联配置：
HAL_DFSDM_FilterConfigRegChannel(hDfsdmFilter, DFSDM_CHANNEL_0, DFSDM_CONTINUOUS_CONV_ON)；

DMA配置：
{
  hdma_dfsdm1_flt0.Instance = DMA1_Stream0;

  hdma_dfsdm1_flt0.Init.Request = DMA_REQUEST_DFSDM1_FLT0;
  hdma_dfsdm1_flt0.Init.Direction = DMA_PERIPH_TO_MEMORY;
  hdma_dfsdm1_flt0.Init.PeriphInc = DMA_PINC_DISABLE;
  hdma_dfsdm1_flt0.Init.MemInc = DMA_MINC_ENABLE;
  hdma_dfsdm1_flt0.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
  hdma_dfsdm1_flt0.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
  hdma_dfsdm1_flt0.Init.Mode = DMA_CIRCULAR;
  hdma_dfsdm1_flt0.Init.Priority = DMA_PRIORITY_VERY_HIGH;
  hdma_dfsdm1_flt0.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

}

Link函数：
__HAL_LINKDMA(hdfsdm_filter,hdmaReg,hdma_dfsdm1_flt0);//这里面hdmaReg这个参数不知道哪来的，我没赋值