#define TIM1_CCR1_Address    ((uint32_t)0x40010034)




        DMA_InitTypeDef    DMA_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;       
        RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);
        /**************DMAÅäÖÃ*****************/
        DMA_DeInit(DMA1_Stream5);
        //while (DMA_GetCmdStatus(DMA1_Stream5) != DISABLE){}
               
        TIM_DMAConfig(TIM1, TIM_DMABase_CCR1, TIM_DMABurstLength_2Bytes );  
        TIM_DMACmd(TIM1, TIM_DMA_Update, ENABLE);
        DMA_InitStructure.DMA_Channel=DMA_Channel_5;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM1_CCR1_Address;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&SPWM[0];// SRC1_Buffer;
  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
  DMA_InitStructure.DMA_BufferSize =512;//DMA»o′æ′óD¡
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//16
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //16
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  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_MemoryBurst_Single;       
  DMA_Init(DMA1_Stream5, &DMA_InitStructure);
        DMA_ClearFlag( DMA1_Stream5,DMA_IT_TCIF5);
  DMA_ITConfig(DMA1_Stream5 , DMA_IT_TC|DMA_IT_HT , ENABLE);
        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
        NVIC_InitStructure.NVIC_IRQChannel=DMA1_Stream5_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x02;
        NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
        NVIC_Init(&NVIC_InitStructure);               
  DMA_Cmd(DMA1_Stream5, ENABLE);       



波形已经输出想通过DMA改变波形就不行了，