STM32F103系列串口2中断回显

usart.c

代码语言：javascript复制

#include "usart.h"

//串口2配置
static void Usart2GpioInit(void)
{
    GPIO_InitTypeDef    GPIO_InitStructure;
    //使能GPIOA时钟
    RCC_APB2PeriphClockCmd(USART2_GPIO_CLK,ENABLE);
    
    //TX 复用推挽输出
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Pin = USART2_TX_GPIO_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(USART2_GPIO_PORT,&GPIO_InitStructure);
    //RX 浮空输入
    GPIO_InitStructure.GPIO_Pin = USART2_RX_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(USART2_GPIO_PORT,&GPIO_InitStructure);
    
}

static void Usart2Config(void)
{
    USART_InitTypeDef         USART_InitStructure;
    
    RCC_APB1PeriphClockCmd(USART2_CLK,ENABLE);
    //USART1 初始化设置
    USART_InitStructure.USART_BaudRate = USART2_BAUDRATE;                            //波特率
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;                        //8位数据位
    USART_InitStructure.USART_StopBits = USART_StopBits_1;                            //一个停止位
    USART_InitStructure.USART_Parity = USART_Parity_No;                                //无奇偶校验
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;    //无硬件流控制
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;                    //收发模式
            
    USART_Init(USART2,&USART_InitStructure);        //初始化串口
    USART_ITConfig(USART2,USART_IT_RXNE,ENABLE);    //开启串口中断
    USART_Cmd(USART2,ENABLE);                        //使能串口
    
}

static void Usart2NvicInit(void)
{
    NVIC_InitTypeDef         NVIC_InitStructure;
    //usart1 NVIC 配置
    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;            
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;    //抢占优先级1
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;            //子优先级1
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;                //IRQ通道使能
    NVIC_Init(&NVIC_InitStructure);

}

void Usart2Init(void)
{
    Usart2GpioInit();
    Usart2NvicInit();
    Usart2Config();
        
}
//重定向输出，使printf能输出在PC端
int fputc(int ch, FILE *f)
{
    while((USART2->SR&0x40)==0);//循环发送，直到发送完成
    USART2->DR = (u8)ch;
    return ch;
}
//中断读取到什么数据就返回什么数据
void USART2_IRQHandler(void)
{
    uint16_t temp;
    if(USART_GetITStatus(USART2,USART_IT_RXNE)!=RESET)
    {    
        temp = USART_ReceiveData(USART2);
        USART_SendData(USART2,temp);
    }
}

usart.h

代码语言：javascript复制

#ifndef _USART_H_
#define _USART_H_

#include "stm32f10x.h"
#include <stdio.h>

//串口2配置
#define        USART2_CLK                        RCC_APB1Periph_USART2
#define        USART2_GPIO_CLK                    RCC_APB2Periph_GPIOA
#define        USART2_BAUDRATE                    115200

                    
#define        USART2_TX_GPIO_PIN                GPIO_Pin_2                
#define        USART2_RX_GPIO_PIN                GPIO_Pin_3
#define        USART2_GPIO_PORT                GPIOA

#define     USART2_IRQn                        USART2_IRQn
#define        USART2_IRQHandler                USART2_IRQHandler

void Usart2Init(void);

#endif

gpio void 配置 数据 硬件

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