DMA发送 设置为 单次发送.   
发送前夕  数组填好数据.  然后

           DMA_ClearFlag(DMA1_FLAG_TC4);
        DMA_Cmd(DMA1_Channel4,DISABLE);
       DMA1_Channel4->CMAR =(uint32)&Str_View.OverviewFIFO[0];//给DMA 发送的基地址
    DMA_SetCurrDataCounter(DMA1_Channel4,Str_View.FIFOCNT);//设置发送的个数
                DMA_Cmd(DMA1_Channel4,ENABLE);        //启动发送
怎么可能会有错

void Uart_OverView_Init(uint8* DataBase,uint32 Len)
{
        /*ê1Äü¶Ë¿úoííaéèê±Öó */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA| RCC_APB2Periph_USART1|RCC_APB2Periph_AFIO, ENABLE);
  
//        GPIO_PinRemapConfig(GPIO_Remap_USART1, ENABLE);

        GPIO_StructInit(&GPIO_InitStructure);
/* ÅäÖýóêÕòy½Å*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  /* ÅäÖ÷￠Ëíòy½Å */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
       
       
  //ÅäÖÃ′®¿ú2Îêy
  USART_StructInit(&USART_InitStructure);
        USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode =  USART_Mode_Tx | USART_Mode_Rx;
  /* Configure USARTy */
  USART_Init(USART1, &USART_InitStructure);
   
        /* Enable the USARTy Interrupt */
        NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
        NVIC_InitStructure.NVIC_IRQChannelCmd = DISABLE;
        NVIC_Init(&NVIC_InitStructure);

  USART_ITConfig(USART1,USART_IT_RXNE,DISABLE);//′ò¿a½óêÕÖD¶Ï
  

        // ′ò¿aDMAê±Öó
        RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
        //éèÖÃDMA
        /* USARTy TX DMA1 Channel (triggered by USARTy Tx event) Config */
  DMA_DeInit(DMA1_Channel4);  
  DMA_InitStructure.DMA_PeripheralBaseAddr = ((unsigned int)&USART1->DR);
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)DataBase;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = 1;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel4, &DMA_InitStructure);
       
       
        USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);

  USART_Cmd(USART1, ENABLE);

  DMA_Cmd(DMA1_Channel4, ENABLE);
}

初始化代码,  你自己对吧.    我应用过 无数次