DAC输出正弦波的问题

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楼主 | 2019-11-1 16:18 | 只看该作者回帖奖励

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正弦波, DAC, DMA, DM, ST

在DAC输出正弦波的时候，配置DMA时，我把配置的顺序改变了，波形也响应的改变了。。。这是什么原因
这是我配置的DMA顺序：：
      DMA_InitStructure.DMA_BufferSize=32;
      DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralDST;
      DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;
      DMA_InitStructure.DMA_MemoryBaseAddr=(uint32_t)&DualSine12bit;
      DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_Word;
      DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;
      DMA_InitStructure.DMA_Mode=DMA_Mode_Circular;
      DMA_InitStructure.DMA_PeripheralBaseAddr= DAC_DHR12RD;
      DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_Word;
      DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;
      DMA_InitStructure.DMA_Priority=DMA_Priority_High;
      DMA_Init(DMA2_Channel4, &DMA_InitStructure);
      DMA_Cmd( DMA2_Channel4,ENABLE);

这是例程配置DMA的顺序：
DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12RD;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&DualSine12bit ;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = 32;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;

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