串口的中斷類型:

#define USART_IT_PE                          ((uint16_t)0x0028)  

#define USART_IT_TXE                         ((uint16_t)0x0727)  

#define USART_IT_TC                          ((uint16_t)0x0626)  

#define USART_IT_RXNE                        ((uint16_t)0x0525)  

#define USART_IT_IDLE                        ((uint16_t)0x0424)  

#define USART_IT_LBD                         ((uint16_t)0x0846)  

#define USART_IT_CTS                         ((uint16_t)0x096A)  

#define USART_IT_ERR                         ((uint16_t)0x0060)  

#define USART_IT_ORE                         ((uint16_t)0x0360)  

#define USART_IT_NE                          ((uint16_t)0x0260)  

#define USART_IT_FE                          ((uint16_t)0x0160)  

USART_IT_PE 奇偶錯誤中斷

USART_IT_TXE發送中斷

USART_IT_TC 傳輸完成中斷

USART_IT_RXNE 接收中斷

USART_IT_IDLE 空閑總線中斷

USART_IT_LBD LIN中斷檢測中斷

USART_IT_CTS CTS中斷

USART_IT_ERR 錯誤中斷

該程序中用到的就是串口的空閑中斷:當總線是一個字節周期內沒有收到數據時觸發

串口的配置如下:

void uart_init(u32 bound){  

        GPIO_InitTypeDef GPIO_InitStructure;  

    USART_InitTypeDef USART_InitStructure;  

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);   

    NVIC_InitTypeDef NVIC_InitStructure;  

     //IO口相關配置  

    USART_DeInit(USART1);    

        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//IO口速率  

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;   

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  

        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  

        GPIO_Init(GPIOA, &GPIO_InitStructure);   

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;  

        GPIO_Init(GPIOA, &GPIO_InitStructure);    

        //串口中斷配置  

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;        

        NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;  

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;  

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;           

    NVIC_Init(&NVIC_InitStructure);   

    USART_InitStructure.USART_Parity = USART_Parity_No;//沒有奇偶校驗位  

    USART_InitStructure.USART_BaudRate = bound;       //波特率設置  

    USART_InitStructure.USART_WordLength = USART_WordLength_8b;//8位數據位  

    USART_InitStructure.USART_StopBits = USART_StopBits_1;//1位停止位  

    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//無硬件數據流配置  

    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//串口收發模式  

        USART_Init(USART1, &USART_InitStructure);   

        USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);  

        USART_Cmd(USART1, ENABLE);    

}    

串口中斷配置:

void USART1_IRQHandler(void)                   

{  

      if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)   

{  

       DMA_Cmd(DMA1_Channel5,DISABLE);  

       recok=1;  

       lenth=USART1->DR;//軟件清空空閑中斷標志位  

       lenth=USART1->SR;  

       lenth=32-DMA_GetCurrDataCounter(DMA1_Channel5);//獲取當前接收的數據量   

       USART_RX_BUF[lenth]=0;//在buff最后加入空字符  

       DMA1_Channel5->CNDTR=32;//重新設置傳輸量為32   

       DMA_Cmd(DMA1_Channel5,ENABLE);  

    }   

}   

DMA配置:

void MYDMA_Config(DMA_Channel_TypeDef* DMA_CHx,u32 cpar,u32 cmar,u16 cndtr)  

{  

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);//使能DMA時鐘  

      DMA_DeInit(DMA_CHx);  

      DMA1_MEM_LEN=cndtr;  

      DMA_InitStructure.DMA_PeripheralBaseAddr = cpar;//外設地址  

      DMA_InitStructure.DMA_MemoryBaseAddr = cmar; //內存地址  

      DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //傳輸方向外設到內存  

      DMA_InitStructure.DMA_BufferSize = cndtr;  //傳輸量  

      DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外設地址不自增    

      DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //內存地址自增  

      DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;   

      DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;   

      DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //普通模式  

      DMA_InitStructure.DMA_Priority = DMA_Priority_High;//高優先級  

      DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;  

      DMA_Init(DMA_CHx, &DMA_InitStructure);    

}   

主函數中需要進行的配置:

MYDMA_Config(DMA1_Channel5,(u32)&USART1->DR,(u32)USART_RX_BUF,32);//傳輸方向設置為USART1->DR到USART_RX_BUF 傳輸大小為32字節  

USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE);//允許DMA請求  

DMA_Cmd(DMA1_Channel5,ENABLE);  

當標志為recok位1時表示接受完成  在主函數中等待recok位1就可以了