public.h

QNX 系统下的串口通讯控制程序,可以根据自己的想法进行修改

#ifndef _PUBLIC_H_
#define _PUBLIC_H_

#endif //_PUBLIC_H_

/***********************************************************************/
//
//OCU line-up test instrument examination tool V1.0
//author:liuwei
//date:090205
/***********************************************************************/
speed_t speed_arr[] = 
{
    B38400, B19200, B9600, B4800, B2400, B1200, B300
};
int name_arr[] = 
{
    38400, 19200, 9600, 4800, 2400, 1200, 300
};
void set_speed(int fd, int speed)
{
    int i;
    int status;
    struct termios Opt;

    tcgetattr(fd, &Opt);
    for (i = 0; i < sizeof(name_arr) / sizeof(int); i++)
    {
        if (speed == name_arr[i])
        {
            tcflush(fd, TCIOFLUSH); //flush input and output buffer
            cfsetispeed(&Opt, speed_arr[i]); //set input baud
            cfsetospeed(&Opt, speed_arr[i]); //set output baud
            status = tcsetattr(fd, TCSANOW, &Opt); //set to fd
            if (status != 0)
            {
                perror("tcsetattr fd1");
            }
            return ;
        }
        tcflush(fd, TCIOFLUSH);
    }
}

int set_Parity(int fd, int character_bits, int stopbits, int parity)
{
    struct termios options;
    if (tcgetattr(fd, &options) != 0)
    {
        perror("SetupSerial 1");
        return  -1;
    } 
    options.c_cflag &= ~CSIZE; //clear CSIZE
    switch (character_bits) //set CSIZE: Character size mask
    {
        case 7:
            options.c_cflag |= CS7; //7 bit
            break;
        case 8:
            options.c_cflag |= CS8; //8 bit
            break;
        default:
            printf("Unsupported data size\n");
            return  -1;
    }
    switch (parity) //set parity: c_cflag and c_iflag
    {
        /* 
        No parity (8N1):
        options.c_cflag &= ~PARENB
        options.c_cflag &= ~CSTOPB    
        options.c_cflag &= ~CSIZE;
        options.c_cflag |= CS8;

        Even parity (7E1):
        options.c_cflag |= PARENB
        options.c_cflag &= ~PARODD
        options.c_cflag &= ~CSTOPB
        options.c_cflag &= ~CSIZE;
        options.c_cflag |= CS7;

        Odd parity (7O1):
        options.c_cflag |= PARENB
        options.c_cflag |= PARODD
        options.c_cflag &= ~CSTOPB
        options.c_cflag &= ~CSIZE;
        options.c_cflag |= CS7;

        Space parity is setup the same as no parity (7S1):
        options.c_cflag &= ~PARENB
        options.c_cflag &= ~CSTOPB
        options.c_cflag &= ~CSIZE;
        options.c_cflag |= CS7; 
         */
        case 'n':
        case 'N'://no parity           
            options.c_cflag &= ~PARENB;//PARENB: Enable  parity  generation  on  output  and  parity checking for input.           
            options.c_iflag &= ~INPCK; //INPCK: Enable input parity checking.
            break;
        case 'o':
        case 'O'://Odd           
            options.c_cflag |= (PARODD | PARENB);
            options.c_iflag |= INPCK;
            break;
        case 'e':
        case 'E'://Even           
            options.c_cflag |= PARENB;
            options.c_cflag &= ~PARODD;
            options.c_iflag |= INPCK;
            break;
        case 'S': 
        case 's':  /*as no parity*/   
            options.c_cflag &= ~PARENB;
            options.c_cflag &= ~CSTOPB;
            break;  
        default:
            fprintf(stderr, "Unsupported parity\n");
            return  -1;
    }   
    //set CSTOPB: Set two stop bits, rather than one.
    switch (stopbits)
    {
        case 1:
            options.c_cflag &= ~CSTOPB; //one stop bit
            break;
        case 2:
            options.c_cflag |= CSTOPB; //double stop bit
            break;
        default:
            fprintf(stderr, "Unsupported stop bits\n");
            return  -1;
    }

    options.c_cc[VTIME] = 50; // 5 seconds
    options.c_cc[VMIN] = 0;   
    //don't do with the data
    options.c_lflag  &= ~(ICANON | ECHO | ECHOE | ISIG);  /*Input*/
    options.c_oflag  &= ~OPOST;   /*Output*/

    tcflush(fd, TCIFLUSH); // Update the input options and do it NOW
    if (tcsetattr(fd, TCSANOW, &options) != 0)
    {
        perror("SetupSerial 3");
        return  -1;
    }
    return 0;
}

int OpenDev(char *Dev)
{
    int fd = open(Dev, O_RDWR);
    if ( -1 == fd)
    {
        perror("Can't Open Serial Port");
        return  -1;
    }
    else
    {
        //fcntl(stc_serial_fd, F_SETFL, FNDELAY);       //don't wait for read
        return fd;
    }
}