关于STM32 USART1 DMA接收问题

zcbmd

我在用DMA进行串口通信，发送过程没有问题，在接受过程中如果没达到DMA中所设定的BufferSize时，程序整个就停止了，一直在等待DMA接收，接收完成后，程序又开始运行，这是什么状况？请教大神？
程序配置如下
/*串口1--PC通讯，波特率9600*/
void Uart1_Configure(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;
  
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1|RCC_APB2Periph_AFIO, ENABLE);
  //FLASH_SetLatency(FLASH_Latency_2);  
  //FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
   //PA9--TX
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//复用推挽输出
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
   //PA10--RX
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
   //PA8--cs
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
   //BaudRate
  USART_InitStructure.USART_BaudRate = 9600;//波特率
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;//一次8位数据
  USART_InitStructure.USART_StopBits = USART_StopBits_1;//在帧结尾传输一个停止位
  USART_InitStructure.USART_Parity = USART_Parity_No;//奇偶失能
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//硬件流控制失能
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//发送、接收使能
  USART_Init(USART1, &USART_InitStructure);
  
   /* USART configuration */  
  USART_ClearFlag(USART1,USART_FLAG_RXNE);
  USART_ClearITPendingBit(USART1, USART_IT_RXNE);
  //USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//使能串口接收中断   /* Enable USART */
  USART_ITConfig(USART1, USART_IT_IDLE , ENABLE);//开启空闲,帧错,噪声,校验错中断
  USART_Cmd(USART1, ENABLE);//使能USART1,USART_Cmd(USART1, DISABLE);失能USART1
  USART_ClearFlag(USART1, USART_FLAG_TC);     /* 清发送外城标志，Transmission Complete flag */
}


void USART_DMA_Configuration(void)
{
  DMA_InitTypeDef DMA_InitStructure;
  /* DMA clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);//DMA1

  /* DMA1 Channel4 (triggered by USART1 Tx event) Config */
  DMA_DeInit(DMA1_Channel4); 
  DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USART1->DR); 
  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&USART_Send_Data;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = 10;
  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_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel4, &DMA_InitStructure);
 
  DMA_ITConfig(DMA1_Channel4, DMA_IT_TC, ENABLE);//DMA传输完成中断
  /* Enable USART1 DMA TX request */
  USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);
 
  DMA_Cmd(DMA1_Channel4, DISABLE);
 
  /* DMA1 Channel5 (triggered by USART1 Rx event) Config */
  DMA_DeInit(DMA1_Channel5); 
  DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USART1->DR);
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)USART_Receive_Data;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 2;
  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_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel5, &DMA_InitStructure);
 
  DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);//DMA接收完成中断
 
  /* Enable USART1 DMA RX request */
  USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
 
  DMA_Cmd(DMA1_Channel5, ENABLE);
}

lxj19901115

去看看DMA 的接收和发送机制是怎么样，多看看手册