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我再补充下，还有编写中断服务函数

//中断代码
void USART1_IRQHandler(void)
{
 static u8 i=0;

 delay(0xfffff);
 //中断接收数据
 if(i%2)
 {
  GPIO_SetBits(GPIOE, GPIO_Pin_4);
 }
 else
 {
  GPIO_ResetBits(GPIOE, GPIO_Pin_4);
 }
 i++;

 //接收数据 
 ch[count] = USART1_Getchar();
 //USART1_Putchar(ch[count]);
 count ++;

 if(ch[count] == 0)
 {
  flag = SET;
  USART_ClearITPendingBit(USART1, USART_IT_ORE);
 }

 //停止中断
 if(count > 50)
 {
  //flag = SET;
  USART_ClearITPendingBit(USART1, USART_IT_ORE);
  //USART_ITConfig(USART1, USART_IT_RXNE, DISABLE);
  count = 0;  
 }
 

 //
}
//各种配置
void USART_Configure()
{
 USART_InitTypeDef USART_InitStruct;
 USART_ClockInitTypeDef USART_ClockInitStruct;
 GPIO_InitTypeDef GPIO_InitStruct;

 USART_InitStruct.USART_BaudRate = 9600;
 USART_InitStruct.USART_StopBits = USART_StopBits_1;
 USART_InitStruct.USART_Parity = USART_Parity_No;
 USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
 USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
 USART_Init(USART1, &USART_InitStruct);

 USART_ClockInitStruct.USART_Clock = USART_Clock_Disable;
 USART_ClockInitStruct.USART_CPOL = USART_CPOL_High;
 USART_ClockInitStruct.USART_CPHA = USART_CPHA_1Edge;
 USART_ClockInitStruct.USART_LastBit = USART_LastBit_Disable;
 USART_ClockInit(USART1, &USART_ClockInitStruct);
 
 //使能USART1
 USART_Cmd(USART1, ENABLE);

 //使能接收中断中断
 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
 //使能DMA发送
 USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);

 DMA_Cmd(DMA1_Channel4, ENABLE);

 GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9;
 GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
 GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

 GPIO_Init(GPIOA, &GPIO_InitStruct);

 GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10;
 GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;

 GPIO_Init(GPIOA, &GPIO_InitStruct);
}

void NVIC_Configure()
{
 NVIC_InitTypeDef NVIC_InitStruct;

    //NVIC_SetVectorTable(NVIC_VectTab_RAM,0x0);
 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);  

 NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn;
 NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
 NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
 NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;

 NVIC_Init(&NVIC_InitStruct);
}

void DMA_Configure()
{
 DMA_InitTypeDef DMA_InitStruct;

 DMA_InitStruct.DMA_PeripheralBaseAddr = tUSART1_DR_Base;
 DMA_InitStruct.DMA_MemoryBaseAddr = (uint32_t)ch;
 DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralDST;
 DMA_InitStruct.DMA_BufferSize = sizeof(ch) / sizeof(ch[0]);
 DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
 DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
 DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
 DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
 DMA_InitStruct.DMA_Mode = DMA_Mode_Normal;
 DMA_InitStruct.DMA_Priority = DMA_Priority_VeryHigh;
 DMA_InitStruct.DMA_M2M = DMA_M2M_Disable;

 DMA_Init(DMA1_Channel4, &DMA_InitStruct);
}