STM32F103系列串口1中断回显

#include "usart.h"


//串口1配置
static void Usart1GpioInit(void)
{
    GPIO_InitTypeDef    GPIO_InitStructure;
    //使能GPIOA时钟
    RCC_APB2PeriphClockCmd(USART1_GPIO_CLK,ENABLE);
    
    //TX 复用推挽输出
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Pin = USART1_TX_GPIO_PIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(USART1_GPIO_PORT,&GPIO_InitStructure);
    //RX 浮空输入
    GPIO_InitStructure.GPIO_Pin = USART1_RX_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(USART1_GPIO_PORT,&GPIO_InitStructure);
    
}

static void Usart1Config(void)
{
    USART_InitTypeDef         USART_InitStructure;
    
    RCC_APB2PeriphClockCmd(USART1_CLK,ENABLE);
    //USART1 初始化设置
    USART_InitStructure.USART_BaudRate = USART1_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(USART1,&USART_InitStructure);        //初始化串口
    USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);    //开启串口中断
    USART_Cmd(USART1,ENABLE);                        //使能串口
    
}

static void Usart1NvicInit(void)
{
    NVIC_InitTypeDef         NVIC_InitStructure;
    //usart1 NVIC 配置
    NVIC_InitStructure.NVIC_IRQChannel = USART_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 Usart1Init(void)
{
    Usart1GpioInit();
    Usart1NvicInit();
    Usart1Config();
        
}

//重定向输出，使printf能输出在PC端
int fputc(int ch, FILE *f)
{
    while((USART1->SR&0x40)==0);//循环发送，直到发送完成
    USART1->DR = (u8)ch;
    return ch;
}
//中断读取到什么数据就返回什么数据
void USART_IRQHandler(void)
{
    uint16_t temp;
    if(USART_GetITStatus(USART1,USART_IT_RXNE)!=RESET)
    {    
        temp = USART_ReceiveData(USART1);
        USART_SendData(USART1,temp);
    }
}

#ifndef _USART_H_
#define _USART_H_

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

//串口1配置
#define        USART1_CLK                        RCC_APB2Periph_USART1
#define        USART1_GPIO_CLK                    RCC_APB2Periph_GPIOA
#define        USART1_BAUDRATE                    115200

                    
#define        USART1_TX_GPIO_PIN                GPIO_Pin_9                
#define        USART1_RX_GPIO_PIN                GPIO_Pin_10
#define        USART1_GPIO_PORT                GPIOA

#define     USART_IRQn                        USART1_IRQn
#define        USART_IRQHandler                USART1_IRQHandler


void Usart1Init(void);

#endif