串口通信

–Usart.h

#ifndef __Usart_h
#define __Usart_h
#include "stm32f10x.h"

int fputc(int ch, FILE *f);
static void USART1_RCC_Configuration(void);
static void USART1_GPIO_Configuration(void);
void USART1_Configuration();


void USART1_NVIC_Configuration(void);

#endif

–Usart.c

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


static void USART1_RCC_Configuration(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |
    RCC_APB2Periph_USART1 | RCC_APB2Periph_AFIO, ENABLE);   //打开时钟使能
}

static void USART1_GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   //浮空输入模式
    GPIO_Init(GPIOA,&GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;         //推完输出模式
    GPIO_Init(GPIOA,&GPIO_InitStructure);
}
void USART1_Configuration()
{
    USART_InitTypeDef USART_InitStructure;                  //设置串口结构体
    USART1_RCC_Configuration();                             //时钟使能初始化
    USART1_GPIO_Configuration();                                                        //GPIO口使能初始化
    USART_InitStructure.USART_BaudRate = 115200;            //设置于串口一致的115200波特率
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;//设置数据位
    USART_InitStructure.USART_StopBits = USART_StopBits_1;     //停止位
    USART_InitStructure.USART_Parity = USART_Parity_No;        //校验位
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;  //流控位
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;  //Rx 和 Tx 发送和读操作

    USART_Init(USART1, &USART_InitStructure);
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);          
    USART_ITConfig(USART1, USART_IT_TXE, DISABLE);           //关闭TXE检测位（最后一位）
    USART_Cmd(USART1, ENABLE);
}

int fputc(int ch, FILE *f)
{
    USART_SendData(USART1, (u8)ch);
    while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
    {}
    return ch;
}

void USART1_NVIC_Configuration(void)   //中断初始化
{
        NVIC_InitTypeDef NVIC_InitStructure;
        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
        NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //串口中断
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);

}

void USART1_IRQHandler(void)
{ 
    uchar           ucByte;

    if(USART_GetFlagStatus(USART1,USART_FLAG_ORE)==SET) //ORE
    {
        USART_ClearFlag(USART1,USART_FLAG_ORE);        //SR
        USART_ReceiveData(USART1);                     //DR
    }   

    if(USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
    {
        ucByte = USART_ReceiveData(USART1);
        switch ( RcvState )
        {
        case STATE_RX_IDLE:
            usRcvBufferPos = 0;
            ucTPSBuf[usRcvBufferPos++] = ucByte;
            RcvState = STATE_RX_RCV;
            THComProTimersEnable();
            break;

        case STATE_RX_RCV:
            if( usRcvBufferPos < THCOMPRO_SER_BUF_SIZE_MAX )
            {
                ucTPSBuf[usRcvBufferPos++] = ucByte;
            }
            else
            {
                RcvState = STATE_RX_ERROR;
            }
            THComProTimersEnable();
            break;
        default:
            break;
        }

        //USART_ClearITPendingBit(USART1, USART_IT_RXNE);
        USART_ClearFlag(USART1,USART_IT_RXNE);
    }


    if(USART_GetITStatus(USART1, USART_IT_TXE) == SET)
    {
        USART_ClearFlag(USART1, USART_IT_TXE);
        if( usSndBufferCount != 0 )
        {
                        USART_SendData(USART1, (char)*pucSndBufferCur);
            pucSndBufferCur++;  
            usSndBufferCount--;
        }
        else
        {
            while (USART_GetITStatus(USART1, USART_IT_TC) == SET);
            USART_ClearFlag(USART1, USART_IT_TC);
            THComProSerialEnable( TRUE, FALSE );
            SndState = STATE_TX_IDLE;
        }
    }

    if(USART_GetFlagStatus(USART1, USART_FLAG_IDLE) != RESET) 
    {     
        USART_ReceiveData(USART1); 
    }
    if(USART_GetFlagStatus(USART1, USART_FLAG_ORE) != RESET)
    {     
        USART_ClearFlag(USART1,USART_FLAG_ORE);        
        USART_ReceiveData(USART1);                    
    }
    if(USART_GetFlagStatus(USART1, USART_FLAG_NE) != RESET) 
    { 
        USART_ReceiveData(USART1); 
    }
    if(USART_GetFlagStatus(USART1, USART_FLAG_FE) != RESET) 
    {  
        USART_ReceiveData(USART1);
    }   
}