comlib/打印机代码/linux/sernew.cpp

#include     <stdio.h>      /*标准输入输出定义*/
#include     <stdlib.h>     /*标准函数库定义*/
#include     <string.h>
#include     <unistd.h>     /*Unix标准函数定义*/
#include     <sys/types.h>  /**/
#include     <sys/stat.h>   /**/
#include     <fcntl.h>      /*文件控制定义*/
#include     <termios.h>    /*PPSIX终端控制定义*/
#include     <errno.h>      /*错误号定义*/

/***@brief  设置串口通信速率
 13*@param  fd     类型 int  打开串口的文件句柄
 14*@param  speed  类型 int  串口速度
 15*@return  void
 16*/
 int speed_arr[] = { B38400, B19200, B9600, B4800, B2400, B1200, B300,
       B38400, B19200, B9600, B4800, B2400, B1200, B300, };
 int name_arr[] = {38400,  19200,  9600,  4800,  2400,  1200,  300,
       38400,  19200,  9600, 4800, 2400, 1200,  300, };

ino_t set_speed(int fd, int speed)
 {
     int   i;
     int   status;
     struct termios   Opt;
     tcgetattr(fd, &Opt);
     for ( i= 0;  i < sizeof(speed_arr) / sizeof(int);  i++)
     {
         if  (speed == name_arr[i])
         {
             tcflush(fd, TCIOFLUSH);
             cfsetispeed(&Opt, speed_arr[i]);
             cfsetospeed(&Opt, speed_arr[i]);
             status = tcsetattr(fd, TCSANOW, &Opt);
             if  (status != 0)
             {
                  return -1;
             }
               // ESLOG_debug("[CES_OpenDoor::set_speed] tcsetattr fd1");
            return 0;
        }
        tcflush(fd,TCIOFLUSH);
    }

    return -2;
 }

 /*
 45*@brief   设置串口数据位，停止位和效验位
 46*@param  fd     类型  int  打开的串口文件句柄*
 47*@param  databits 类型  int 数据位   取值 为 7 或者8*
 48*@param  stopbits 类型  int 停止位   取值为 1 或者2*
 49*@param  parity  类型  int  效验类型 取值为N,E,O,,S
*/

 int set_Parity(int fd,int databits,int stopbits,int parity)
 {
     struct termios options;
     if  ( tcgetattr( fd,&options)  !=  0)
     {
         //ESLOG_debug("[CES_OpenDoor::set_Parity] tcgetattr() 1");
         return -1;
     }

     options.c_cflag &= ~CSIZE;
     switch (databits) /*设置数据位数*/
     {
         case 7:
             options.c_cflag |= CS7;
             break;
         case 8:
             options.c_cflag |= CS8;
             break;
         default:
             //ESLOG_debug("[CES_OpenDoor::set_Parity]  Unsupported data size\n");
             return -2;
     }

     switch (parity)
     {
         case 'n':
         case 'N':
             options.c_cflag &= ~PARENB;   /* Clear parity enable */
            options.c_iflag &= ~INPCK;     /* Enable parity checking */
             break;
         case 'o':
         case 'O':
             options.c_cflag |= (PARODD | PARENB);  /* 设置为奇效验*/ 
             options.c_iflag |= INPCK;             /* Disnable parity checking */
            break;
         case 'e':
         case 'E':
            options.c_cflag |= PARENB;     /* Enable parity */
             options.c_cflag &= ~PARODD;   /* 转换为偶效验*/  
             options.c_iflag |= INPCK;       /* Disnable parity checking */
            break;
        case 'S':
         case 's':  /*as no parity*/
             options.c_cflag &= ~PARENB;
            options.c_cflag &= ~CSTOPB;
             break;
         default:
           //  ESLOG_debug("[CES_OpenDoor::set_Parity] Unsupported parity\n");
             return -3;
     }
/* 设置停止位*/   
    switch (stopbits)
   {
           case 1:
       options.c_cflag &= ~CSTOPB;
        break;
    case 2:
      options.c_cflag |= CSTOPB;
      break;
   default:
//        ESLOG_debug("[CES_OpenDoor::set_Parity] Unsupported stop bits\n");
        return -4;
    }

    /* Set input parity option */
    if (parity != 'n')
        options.c_iflag |= INPCK;

    options.c_cc[VTIME] = 150; // 15 seconds
    options.c_cc[VMIN] = 0;
    tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */
    if (tcsetattr(fd,TCSANOW,&options) != 0)
    {
        //ESLOG_debug("[CES_OpenDoor::set_Parity] tcsetattr） ；
        return -5;
    }
    return 0;
}

 

/**
*@breif 打开串口
*/
int OpenDev(char *Dev)
{
    int n_fd_com = open( Dev, O_RDWR| O_NOCTTY | O_NDELAY );         //
    if (-1 == n_fd_com)
    { /*设置数据位数*/
    //        ESLOG_debug("[CES_OpenDoor::OpenDev] Can't Open Serial Port");
        return n_fd_com;
    }    
   else
    {
        set_speed(n_fd_com,19200);
        if (set_Parity(n_fd_com,8,1,'N') <0)
        {
            //ESLOG_debug("[CES_OpenDoor::OpenDev] Set Parity Error\n");
            return -1;
        }
        return n_fd_com;
    }
}

int main()
{
    int fd;
    char buf[32];

    fd = OpenDev("/dev/pts/1");
    if(fd <0)
    {
        printf("open dev fail\r");
        return -1;
    }

     int i =0;
     strcpy(buf,"test");
     while(1)
     {
         
         sprintf(buf,"the num is %d",i++);
         int rv = write(fd,buf,strlen(buf));

         if(rv <0)
         {
             break;
         }
         
         usleep(100000);

        // sleep(100);
     }
     close(fd);
     
     return 0;
}