DMA循环模式数据为什么不更新

lace片

这是DMA的配置函数


void MYDMA_Config(DMA_Stream_TypeDef *DMA_Streamx,u32 chx,u32 par,u32 mar0,u32 mar1,u16 ndtr)
{

        DMA_InitTypeDef  DMA_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
       
        if((u32)DMA_Streamx>(u32)DMA2)//μÃμ½μ±Ç°streamêÇêôóúDMA2»1êÇDMA1
        {
          RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);//DMA2ê±Öóê1Äü
               
        }else
        {
          RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);//DMA1ê±Öóê1Äü
        }
  DMA_DeInit(DMA_Streamx);
       
        while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){}//μè′yDMA¿éÅäÖÃ
       
  /* ÅäÖÃ DMA Stream */
  DMA_InitStructure.DMA_Channel = chx;  //í¨μàÑ¡Ôñ
  DMA_InitStructure.DMA_PeripheralBaseAddr = par;//DMAíaéèμØÖ·
  DMA_InitStructure.DMA_Memory0BaseAddr = mar0;//DMA ′æ′￠Æ÷0μØÖ·
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//íaéèμ½′æ′￠Æ÷Ä￡ê½
  DMA_InitStructure.DMA_BufferSize = ndtr;//êy¾Y′«êäá¿
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//íaéè·ÇÔöá¿Ä￡ê½
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//′æ′￠Æ÷Ôöá¿Ä￡ê½
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//íaéèêy¾Y3¤¶è:16λ
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//′æ′￠Æ÷êy¾Y3¤¶è:16λ
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;// ê1óÃÑ-»·»o′æÄ￡ê½
  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//óÅÏ輶
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;         
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//′æ′￠Æ÷í»·￠μ￥′Î′«êä
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//íaéèí»·￠μ￥′Î′«êä

                DMA_DoubleBufferModeConfig(DMA2_Stream0,mar1,DMA_Memory_0);//DMA′æ′￠Æ÷1μØÖ·,2￠Ñ¡¶¨mar0Îaμúò»¸öÖ′DDμÄ»o3åÇø
                DMA_DoubleBufferModeCmd(DMA2_Stream0,ENABLE);
                DMA_Init(DMA_Streamx, &DMA_InitStructure);//3õê¼»ˉDMA Stream
               
//    DMA_ITConfig(DMA2_Stream0,DMA_IT_TC,ENABLE);
//                DMA_ClearFlag(DMA2_Stream0,DMA_IT_TC);
//        NVIC_InitStructure.NVIC_IRQChannel=DMA2_Stream0_IRQn;        //ADC11òÔúDMAμÄí¨μà2éÏ
//        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x01;                     //ÇàÕ¼óÅÏ輶
//        NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x01;                            //Ïìó|óÅÏ輶
//        NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
//        NVIC_Init(&NVIC_InitStructure);
       
        while (DMA_GetCmdStatus(DMA2_Stream0) != DISABLE){}
  DMA_Cmd(DMA2_Stream0,ENABLE);
}