1、函数初始化

    1. #include "bsp_usart.h"
    3. void BSP_USART1_INIT(uint32_t bound)
    4. {
    5.     //初始化时钟
    6.     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //使能GPIOA时钟
    7.     RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);//使能USART1时钟
    8.     //初始化引脚
    9.     {
    10.         GPIO_InitTypeDef GPIO_InitStructure;
    12.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; //GPIOA9与GPIOA10
    13.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//复用功能
    14.         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;    //速度50MHz
    15.         GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽复用输出
    16.         GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
    18.         GPIO_Init(GPIOA,&GPIO_InitStructure);
    20.         GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9复用为USART1
    21.         GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10复用为USART1
    22.     }
    23.     //初始化串口
    24.     {
    25.         USART_InitTypeDef USART_InitStructure;
    27.         USART_InitStructure.USART_BaudRate = bound;//波特率设置
    28.         USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
    29.         USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
    30.         USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
    31.         USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
    32.         USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;    //收发模式
    34.         USART_Init(USART1, &USART_InitStructure); //初始化串口1
    35.     }
    36.     //初始化NVIC
    37.     {
    38.         NVIC_InitTypeDef NVIC_InitStructure;
    40.         NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;//串口1中断通道
    41.         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//抢占优先级3
    42.         NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;        //子优先级3
    43.         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;            //IRQ通道使能
    45.         NVIC_Init(&NVIC_InitStructure);
    46.     }
    47.     //使能中断或者使能串口
    48.     {
    49.         USART_Cmd(USART1, ENABLE);
    50.         USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启相关中断
    51.     }
    52. }

    2、中断服务函数

    1. void USART1_IRQHandler(void)                    //串口1中断服务程序
    2. {
    3. //    u8 Res;
    5.     if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  //接收中断(接收到的数据必须是0x0d 0x0a结尾)
    6.     {
    7. //        Res =USART_ReceiveData(USART1);//(USART1->DR);    //读取接收到的数据                     
    8.     } 
    9.     USART_ClearITPendingBit(USART1, USART_IT_RXNE);
    10. }