1、串口初始化

    1. #include "bsp_usart.h"
    2. #include "stdio.h"
    4. int fputc(int ch, FILE *f)
    5. {      
    6.     while((USART1->SR&0X40)==0){}//循环发送,直到发送完毕   
    7.     USART1->DR = (u8) ch;      
    8.     return ch;
    9. }
    11. void BSP_USART1_INIT(uint32_t bound)
    12. {
    13.     //打开时钟
    14.     RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
    15.     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    16.     //引脚初始化
    17.     {
    18.         GPIO_InitTypeDef GPIO_InitStructure;
    20.         //USART1_TX   GPIOA.9
    21.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; 
    22.         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    23.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;    
    24.         GPIO_Init(GPIOA, &GPIO_InitStructure);
    26.         //USART1_RX      GPIOA.10初始化
    27.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    28.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    29.         GPIO_Init(GPIOA, &GPIO_InitStructure);
    30.         //GPIO_PinRemapConfig(GPIO_Remap_USART1,ENABLE);
    31.     }
    32.     //串口初始化
    33.     {
    34.         USART_InitTypeDef USART_InitStructure;
    36.         USART_InitStructure.USART_BaudRate   = bound;//串口波特率
    37.         USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
    38.         USART_InitStructure.USART_StopBits   = USART_StopBits_1;//一个停止位
    39.         USART_InitStructure.USART_Parity     = USART_Parity_No;//无奇偶校验位
    40.         USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
    41.         USART_InitStructure.USART_Mode       = USART_Mode_Rx | USART_Mode_Tx;    //收发模式
    43.         USART_Init(USART1, &USART_InitStructure);
    44.     }
    45.     //NVIC初始化
    46.     {
    47.         NVIC_InitTypeDef NVIC_InitStructure;
    49.         NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    50.         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
    51.         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;        //子优先级3
    52.         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;            //IRQ通道使能
    53.         NVIC_Init(&NVIC_InitStructure);
    54.     }
    55.     //开启串口中断和串口中断使能
    56.     {
    57.         USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断
    58.         USART_Cmd(USART1, ENABLE);
    59.     }
    60. }

    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;
    4.     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)
    5.     {
    6. //        Res =USART_ReceiveData(USART1);    //读取接收到的数据
    7.     }
    8.     USART_ClearITPendingBit(USART1, USART_IT_RXNE);
    9. }