DMA1和DMA2的传输能同时从2个RAM区域向同一个GPIO进行传送吗？

只看该作者 · 2010-2-11 10:50

在做一个块子,需要循环传送2*65536长度的数组数据到GPIO,能进行这样的操作吗?若能请教怎样设置才行?

只看该作者 · 2010-2-11 10:53

用DMA1从RAM传送数据到GPIO如下:
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&GPIOG->ODR;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) Parallel_Data_Buffer;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 65536;
  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_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel3, &DMA_InitStructure);

  /* Enable DMA Channel6 */
  DMA_Cmd(DMA1_Channel3, ENABLE);