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//定义DMA映射地址
#define USART2_DR_ADDR 0x40004404;
//main函数里面:  
while (DMA_GetFlagStatus(DMA_FLAG_TC7) == RESET)
  {//等待发送完全
  }
//时钟配置加一句：
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA, ENABLE);
//串口配置加一句：
USART_DMACmd(USART2,USART_DMAReq_Tx,ENABLE);
//DMA配置
void DMA_Configuration(void)
{
    DMA_InitTypeDef DMA_InitStructure; 
    DMA_DeInit(DMA_Channel7); //将dma的通道寄存器设为默认值
    DMA_InitStructure.DMA_PeripheralBaseAddr = USART2_DR_ADDR;  //定义dma外设基地址 
    DMA_InitStructure.DMA_MemoryBaseAddr = (u32)array_data_send; 
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;  //外设作为数据传输的目的地 
    DMA_InitStructure.DMA_BufferSize = 3;   //dma缓存大小    
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变 
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;    //内存地址寄存器 递增 
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; //外设数据宽度 
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word; 
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;  //工作在循环缓存模式，数据传输数目为0时，自动恢复配置初值 
    DMA_InitStructure.DMA_Priority = DMA_Priority_High; 
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;  //通道未被设置成内存到内存模式，与循环模式相对 
    DMA_Init(DMA_Channel7, &DMA_InitStructure); //将DMA_InitStructure中指定的参数初始化dma的通道寄存器 
    DMA_Cmd(DMA_Channel7, ENABLE);  //使能通道
}