学步园

#define SERIAL_PORT "/dev/ttyS0" //COM 1
#define BAUDRATE B38400   //9600bps
#define MAX_SIZE 255

/** \brief 打开串行端口一
 *  \brief 成功后返回文件描述符，或是失败后返回-1
 */
int open_port()
{
    int fd; /* 端口文件描述符 */

    fd = open(SERIAL_PORT, O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1)
    {
 perror("open_port: Unable to open /dev/ttyS0 - ");
    }
   
    return (fd);
}

void set_port(int fd)
{
    struct termios options;
    int flag;
   
    tcgetattr(fd, &options);

    fcntl(fd, F_SETFL, 0);

    cfsetispeed(&options, BAUDRATE);
    cfsetospeed(&options, BAUDRATE);
   
    options.c_cflag |= (CLOCAL | CREAD);

    /* Set to 8N1 */
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;

    /* HANDSHAKE 也称为 CRTSCTS */
    options.c_cflag |= CRTSCTS;   

    /* RAW */
    options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);   
    options.c_oflag &= ~OPOST;

    /* For read data from printer */
    options.c_cc[VMIN] = 0;
    options.c_cc[VTIME] = 1;   

    flag = tcsetattr(fd, TCSANOW, &options);
    if (flag < 0)
    {
 perror("set_port: Setting port /dev/ttyS0 error - ");
    }
}

void close_port(int fd)
{
    close(fd);
}

int main(int argc, char *argv[])
{
    int fd, i;

    /* Open COM1 (/dev/ttyS0) and set for write mode! */
    fd = open_port();

    set_port(fd);
   
    /* String data to be written */
    char strOutput[] = "EPSON (CHINA) CORP.\x0A";
    size_t sizeOutput = strlen(strOutput);
   
    char strOutputCh[] = "爱普生(中国)有限公司\x0A";
    size_t sizeOutputCh = strlen(strOutputCh);

    /* Feed 4 lines */
    char strFeed4Lines[] = "\x0A\x0A\x0A\x0A";

    /* Set Font size */
    char strSetFontSize[] = "\x1D\x21\x11";
   
    /* Feed and cut paper */
    char strCutPaper[] = "\x1D\x56\x42\x00";

    /* 1.Normal size */
    for (i = 0; i < 3; i++)
    {
 write(fd, &strOutput, sizeOutput);
 write(fd, &strOutputCh, sizeOutputCh);
    }
    write(fd, &strFeed4Lines, 4);

    /* 2.Double width */
    strSetFontSize[2] = '\x10';
    write(fd, &strSetFontSize, 3);

     for (i = 0; i < 3; i++)
    {
 write(fd, &strOutput, sizeOutput);
 write(fd, &strOutputCh, sizeOutputCh);
    }
    write(fd, &strFeed4Lines, 4);

    /* 3.Double height */
    strSetFontSize[2] = '\x01';
    write(fd, &strSetFontSize, 3);

    for (i = 0; i < 3; i++)
    {
 write(fd, &strOutput, sizeOutput);
 write(fd, &strOutputCh, sizeOutputCh);
    }
    write(fd, &strFeed4Lines, 4);

    /* 4.Set font to be 3x3 */
    strSetFontSize[2] = '\x22';
    write(fd, &strSetFontSize, 3);

    for (i = 0; i < 3; i++)
    {
 write(fd, &strOutput, sizeOutput);
 write(fd, &strOutputCh, sizeOutputCh);
    }
    write(fd, &strFeed4Lines, 4);

    /* 5.Set font back to be default */
    strSetFontSize[2] = '\x00';
    write(fd, &strSetFontSize, 3);

    for (i = 0; i < 3; i++)
    {
 write(fd, &strOutput, sizeOutput);
 write(fd, &strOutputCh, sizeOutputCh);
    }
    write(fd, &strFeed4Lines, 4);

    /* Feed and cut paper */
    write(fd, &strCutPaper, 4);
 
    close_port(fd);
   
    return 0;
}