/*******************************************************************************Copyright (C), *** Tech. Co., Ltd.FileName: uart.cAuthor:   Version :  Date: 2008-1-11Description: 串口的通用操作文件other:Function List:History: // 历史修改记录    1. Date:        Author:        Version:        Modification:*******************************************************************************/#include "uart.h"#include "system.h"int SpeedArr[6] = { B1200, B1800, B2400, B4800, B9600, B19200 };/*******************************************************************************Function:  UartOpenDescription: 初始化串口Calls:Called By:Global Accessed:Global Updated:Input:  1.UartInitParam:串口初始化参数Output:Return: -1为失败, 成功返回串口的文件描述符Others:*******************************************************************************/intUartOpen (int UartIndex, UART485_INIT_CONFIG *pUartInitConfig,          int *pUartFd){#ifndef    MCU_I686    #else                            //上位机模拟    char dev[20];    struct termios opt;    sprintf (dev, "/dev/ttyS%d", UartIndex);    if (((*pUartFd) = open (dev, O_RDWR | O_NOCTTY)) < 0)    {        printf ("can not open ttyS%d device\n", UartIndex);        return -1;    }    tcgetattr ((*pUartFd), &opt);    //设置波特率    if ((pUartInitConfig->speed) > 5)        return -1;    cfsetispeed (&opt, SpeedArr[(int) pUartInitConfig->speed]);    cfsetospeed (&opt, SpeedArr[(int) pUartInitConfig->speed]);    //设置数据位    opt.c_cflag &= (~CSIZE);    switch (pUartInitConfig->databit)    {    case 7:        opt.c_cflag |= CS7;        break;    case 8:        opt.c_cflag |= CS8;        break;    default:        printf ("Unsupported data size\n");        return -1;    }    //设置停止位    switch (pUartInitConfig->stopbit)    {    case 1:        opt.c_cflag &= ~CSTOPB;        break;    case 2:        opt.c_cflag |= CSTOPB;        break;    default:        printf ("Unsupported stop bits\n");        return -1;    }    //设置校验位    switch (pUartInitConfig->verify)    {    case ‘n‘:        opt.c_cflag &= ~PARENB;        opt.c_iflag &= ~INPCK;        break;    case ‘o‘:        opt.c_cflag |= (PARODD | PARENB);        opt.c_iflag |= INPCK;        break;    case ‘e‘:        opt.c_cflag |= PARENB;        opt.c_cflag &= ~PARODD;        opt.c_iflag |= INPCK;        break;    default:        printf ("Unsupported parity\n");        return -1;    }    //设置超时时间    opt.c_cc[VTIME] = 10;    opt.c_cc[VMIN] = 0;    //设置为RAW模式    opt.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);    opt.c_iflag &= ~(IXON | IXOFF | ICRNL);    opt.c_oflag &= ~OPOST;    tcflush ((*pUartFd), TCIOFLUSH);    return tcsetattr ((*pUartFd), TCSANOW, &opt);#endif}/*******************************************************************************Function:  UartCloseDescription: 关闭串口Calls:Called By:Global Accessed:Global Updated:Input:  1.UartFd:串口的文件描述符Output:Return: -1为失败Others:*******************************************************************************/intUartClose (int UartFd){    return close (UartFd);}/*******************************************************************************Function:  UartSendDescription: 串口的发送函数Calls:Called By:Global Accessed:Global Updated:Input:  1.UartFd:串口的文件描述符           2.SendBuff:发送缓冲区           3.SendNum:发送字节数Output:Return: -1为失败,Others:*******************************************************************************/intUartSend (int UartFd, unsigned char *pSendBuff, int SendNum){    int n_send, write_num;    for (n_send = 0; n_send < SendNum;)    {        write_num = write (UartFd, &pSendBuff[n_send], SendNum - n_send);        if (write_num <= 0)        //发送失败            return -1;        n_send = n_send + write_num;    }    return n_send;}/*******************************************************************************Function:  UartRcvDescription: 串口的接收函数Calls:Called By:Global Accessed:Global Updated:Input:  1.UartFd:串口的文件描述符           2.RcvBuff:接收缓冲区           3.RcvNum:接收字节数Output:Return: -1为失败,Others:*******************************************************************************/intUartRcv (int UartFd, unsigned char *pRcvBuff, int RcvNum, int OverTime){#ifndef MCU_I686    #else    int n_rcv, read_num;    for (n_rcv = 0; n_rcv < RcvNum;)    {        read_num = read (UartFd, &pRcvBuff[n_rcv], RcvNum - n_rcv);        if (read_num <= 0)        //接收超时或失败            return -1;        n_rcv = n_rcv + read_num;    }    return n_rcv;#endif}/*******************************************************************************Function:  UartClearRcvBufDescription: 串口缓冲区的清空函数Calls:Called By:Global Accessed:Global Updated:Input:  1.UartFd:串口的文件描述符Output:Return: -1为失败,Others:*******************************************************************************/intUartClearRcvBuf (int UartFd){#ifndef MCU_I686    #else    return tcflush (UartFd, TCIOFLUSH);#endif}

/*******************************************************************************Copyright (C), *** Tech. Co., Ltd.File name: uart.h   Author:   Version:  Date:     2008-1-11Description:  串口通用操作的头文件Others:Function List:    1.  int UartOpen( UART_INIT_PARAM UartInitParam );    2.  int UartClose( int UartFd );    3.  int UartSend( int UartFd, unsigned char *SendBuff, int SendNum );    4.  int UartRcv( int UartFd, unsigned char *RcvBuff, int RcvNum );    5.     int UartRcv( int UartFd );History:    1. Date:        Author:        Modification:*******************************************************************************/#ifndef  _UART_H_#define _UART_H_#include <stdio.h>#include <sys/time.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <unistd.h>#include <time.h>#include <pthread.h>#include <string.h>#include <stdlib.h>#include <dirent.h>#include <semaphore.h>#include <mntent.h>#include <sys/vfs.h>#include <getopt.h>#include <termios.h>#include <errno.h>#include <sys/ioctl.h>#include <linux/ioctl.h>extern int SpeedArr[6];typedef struct _UART485_INIT_CONFIG{    char speed;                    //串口速度, 0-5代表1200,1800,2400,4800,9600,19200    char databit;                //串口数据位  5,6,7或8    char stopbit;                //串口停止位   1或2    char verify;                //串口校验位   ‘n‘,‘o‘,‘e‘分别代表无校验,奇校验,偶校验} UART485_INIT_CONFIG;int UartOpen (int UartIndex, UART485_INIT_CONFIG *pUartInitConfig,              int *pUartFd);int UartClose (int UartFd);int UartSend (int UartFd, unsigned char *pSendBuff, int SendNum);int UartRcv (int UartFd, unsigned char *pRcvBuff, int RcvNum,             int OverTime);int UartClearRcvBuf (int UartFd);#endif                            //end   _UART_H_