大家好，请问TIMx_DMAR是干嘛用的？

莆田

如题，有一段代码是这样的，不知什么意思：
 /* DMA TIM1 update configuration */
  DMA_DeInit(DMA1_Channel5);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)TIM1_DMAR_Address; 
  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)(hCCRBuff);
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = 4;
  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_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel5, &DMA_InitStructure);
  /* Enable DMA Channel5 */
  DMA_Cmd(DMA1_Channel5, ENABLE);

正点原子

看其值定义.
然后找寄存器.