修改了串口通信的代码板子发送的数据PC收不到 第7页

ag &= ~OPOST;
    options.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
    /*options.c_cflag &= ~CSIZE;
    options.c_lflag  &= ~(ICANON | ECHO | ECHOE | ISIG);
    options.c_oflag  &= ~OPOST;   */

    switch (ai_databits) /*设置数据位数*/
    {
        case 5:
            options.c_cflag |= CS5;
            break;
        case 6:
            options.c_cflag |= CS6;
            break;
        case 7:
            options.c_cflag |= CS7;
            break;
        case 8:
            options.c_cflag |= CS8;
            break;
        default:
            return ERROR_DATABITS;
    }
    switch (ai_parity)
    {
        /*case 'n':
        case 'N':*/
        case 1:
            options.c_cflag &= ~PARENB;   /* Clear parity enable */
            options.c_iflag &= ~INPCK;     /* Enable parity checking

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