STM32项目：USART1配置与中断接收

一、简述

本文介绍的是一个.c文件中的内容，主要功能为STM32F101C8T6中USART1的初始化、配置、中断接收以及发送函数。

#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_usart.h"

u8 USART1_RX_Buff[4] = {0x00, 0x00, 0x00, 0x00};
u8 USART1_RX_Count = 0;

二、USART1初始化与配置

void USART1_Init(u32 bound){
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);
    
    USART_DeInit(USART1);
    
    //USART1_TX   GPIOA.9
    GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP; //复用推挽输出
    GPIO_Init(GPIOA,&GPIO_InitStructure);
    
    //USART1_RX      GPIOA.10
    GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING; //浮空输入
    GPIO_Init(GPIOA,&GPIO_InitStructure);
    
    //Usart1 NVIC 配置
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级0
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级0
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
    
    //USART 初始化设置
    USART_InitStructure.USART_BaudRate = bound;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_WordLength = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    
    USART_Init(USART1, &USART_InitStructure);
    
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //开启串口接受中断
    USART_Cmd(USART1, ENABLE); //使能串口1
}

三、中断接收函数

void USART1_IRQHandler(){
    u8 Temp;
    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET){
        Temp = USART_ReceiveData(USART1); //读取接收到的数据
        if(USARTx_RX_Count < 4){
            USARTx_RX_Buff[USARTx_RX_Count] = Temp;
            USARTx_RX_Count++;
        }
    }
    //溢出-如果发生溢出需要先读SR,再读DR寄存器则可清除不断入中断的问题
    while(USART_GetFlagStatus(USART1, USART_FLAG_TC) != SET){
        USART_ReceiveData(USART1);
        USART_ClearFlag(USART1, USART_FLAG_ORE);
    }   
    USART_ClearFlag(USART1, USART_IT_RXNE); //一定要清除接收中断
}

四、发送函数

void USART1_TxChar(int ch){
    USART_SendData(USART1, (u8)ch); 
    while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
}


void USART1_TxStr(char *pt){
    while(*pt != '\0'){
        USARTx_TxChar(*pt);
        pt++;
    }
}

void USART1_TxCharBuff(u8 buf[], u32 len){
    u32 i;
    for(i = 0; i < len; i++){
        USARTx_TxChar(buf[i]);
    }
}