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 != ''){

        USARTx_TxChar(*pt);

        pt++;

    }

}

void USART1_TxCharBuff(u8 buf[], u32 len){

    u32 i;

    for(i = 0; i < len; i++){

        USARTx_TxChar(buf[i]);

    }

}