stm32f103c8t6 串口空闲中断DMA接收问题

just88 提问时间：2020-2-11 23:06 /

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Usart1-Rx作为外设，DMA接收到内存Buf，设置串口空闲中断，结果是空闲中断后得到数据没有按照一个Byte拆包，很纳闷是怎么回事：比如串口助手发送数据A1B2C3D4,中断后接收到数据是Buf【0】=D4C3B2A1;DMA初始化中设置数据传输是8位，不应该是 Buf【0】=A1,Buf【1】=B2,Buf【2】=C3,Buf【3】=D4;一个Byte数据一个地址递增吗？
Usart1初始化：
      //GPIO端口设置
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);       //使能USART1，GPIOA时钟

      //USART1_TX GPIOA.9
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;       //复用推挽输出
      GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9

      //USART1_RX       GPIOA.10初始化
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
      GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10

      //Usart1 NVIC 配置
      NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;             //子优先级3
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                      //IRQ通道使能
      NVIC_Init(&NVIC_InitStructure);       //根据指定的参数初始化VIC寄存器

      //USART 初始化设置

      USART_InitStructure.USART_BaudRate = bound;//串口波特率
      USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
      USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
      USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
      USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
      USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;       //收发模式

      USART_Init(USART1, &USART_InitStructure);                //初始化串口1
      USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);       //开启串口接受中断
      USART_ITConfig(USART1,USART_IT_IDLE,ENABLE);
      USART_Cmd(USART1, ENABLE);                         //使能串口1

//*********************************************************************************
dma初始化：
      RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);                                  //使能DMA传输
      DMA_DeInit(DMA1_Channel5);                                                                            //将DMA的通道1寄存器重设为缺省值
      DMA1_MEM_LEN=100;
      DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR;                //DMA外设基地址
      DMA_InitStructure.DMA_MemoryBaseAddr =(uint32_t)Usart1RxBuf;                         //DMA内存基地址
      DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;                                        //数据传输方向，从内存读取发送到外设
      DMA_InitStructure.DMA_BufferSize = 100;                                                                //DMA通道的DMA缓存的大小
      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_Byte; //数据宽度为8位
      DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;                //数据宽度为8位
      DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;                                           //工作在正常模式
      DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;                                        //DMA通道 x拥有中优先级
      DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;                                                 //DMA通道x没有设置为内存到内存传输
      DMA_Init(DMA1_Channel5, &DMA_InitStructure);                                                       //根据DMA_InitStruct中指定的参数初始化DMA的通道USART1_Tx_DMA_Channel所标识的寄存器
      USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE);
      DMA_Cmd(DMA1_Channel5,ENABLE);

//*********************************************************************************
IDLE中断：
      uint8_t Res;
      if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)  //
      {
//             USART_ClearFlag(USART1,USART_FLAG_IDLE);
            Res=USART1->SR;
            Res=USART1->DR;
            DMA_Cmd(DMA1_Channel5,DISABLE);
            DMA_SetCurrDataCounter(DMA1_Channel5,100);
            DMA_Cmd(DMA1_Channel5,ENABLE);


            memcpy(Usart1RxData,Usart1RxBuf,100);
            memset(Usart1RxBuf,0x00,100);
      }