STM32F4的DMA为什么未能使能-第2页回答

STM32F4的DMA为什么未能使能

2019-07-14 13:16发布

读取DMA使能状态时，进入死循环，说明DMA没有使能，但是我觉得代码没有问题呀？为何会这样呢？

求大神指导。

另外，DMA_Stream和外设的对应关系在哪里找呀？我看手册上只有和Channel的对应关系呀？

void DMA_Config(void)
{
  DMA_InitTypeDef  DMA_InitStructure;
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);

  DMA_DeInit(DMA1_Stream1);
  while (DMA_GetCmdStatus(DMA1_Stream1) != DISABLE)
  {
  }

  DMA_InitStructure.DMA_Channel = DMA_Channel_4;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)aSRC_Const_Buffer;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)aDST_Buffer;
  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToMemory;
  DMA_InitStructure.DMA_BufferSize = 32;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Enable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
  DMA_Init(DMA1_Stream1, &DMA_InitStructure);

  DMA_Cmd(DMA1_Stream1, ENABLE);

  while (DMA_GetCmdStatus(DMA1_Stream1) != ENABLE)
  {
  }

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