[ts-7000] Re: Failure to read serial comm on TS-7300

["shusshinchi" <>]

Yes, this is C++. But nevermind the language and syntax, it`s not important at all. The code here is not production code. It`s just a testing program to make sure I`m able to communicate over the serial ports before I do anything for the production code. Ok, actually I`ve tried several variations of the code I posted while trying to get it to work. I do get EAGAIN. And yes, I`ve tried issuing read again after doing sleep, and of course I get nothing. I`ve also tried to use blocking mode, to which I also get nothing. The last variation I tried (and optimistic to say, with partial success) is where I perform a write and read repeatly, and then closing and opening the port again after each write and read. Doing this, I managed get the correct and expected data with every other read. Wonder why...

int main ( int argc, char** argv )
{
    for ( ; ; )
    {
        int fd = open ( argv[1], O_RDWR | O_NOCTTY | O_NDELAY ) ;
        termios port_settings ;

        cout << "fd = " << fd << endl ;

        memset ( &port_settings, 0, sizeof port_settings ) ;
        cfsetispeed ( &port_settings, B9600 ) ;
        cfsetospeed ( &port_settings, B9600 ) ;

        port_settings.c_cc[VMIN] = 0 ;
        port_settings.c_cc[VTIME] = 10 ;

        port_settings.c_iflag &= ~ICRNL ;
        port_settings.c_cflag &= ~PARENB ;
        port_settings.c_cflag &= ~CSTOPB ;
        port_settings.c_cflag &= ~CSIZE ;
        port_settings.c_cflag |= CRTSCTS ;
        port_settings.c_cflag |= CS8 ;
        port_settings.c_cflag |= CREAD ;
        port_settings.c_cflag |= CLOCAL ;

        tcsetattr ( fd, TCSANOW, &port_settings ) ;
        tcflush ( fd, TCIOFLUSH ) ;

        char output[ ] = { 0x06, 0x01, 0x00, 0x00, 0x00, 0x10, 0x3c, 0x71 } ;
        int wResult ;
        char cA[8] ;
        int r ;

        memset ( cA, 0, 8 ) ;

        cA[7] = '\0' ;
        wResult = write ( fd, output, 8 ) ;

        cout << "Bytes written = " << wResult << endl ;

        if ( wResult == -1 )
        {
            switch ( errno )
            {
                case EAGAIN : cout << "eagain" << endl ; sleep ( 1 ) ; break ;
                case EBADF : cout << "ebadf" << endl ; break ;
                case EFAULT : cout << "efault" << endl ; break ;
                case EINTR : cout << "eintr" << endl ; break ;
                case EINVAL : cout << "einval" << endl ; break ;
                case EIO : cout << "eio" << endl ; break ;
                case ENOSPC : cout << "enospc" << endl ; break ;
                case EISDIR : cout << "eisdir" << endl ; break ;
                case EPIPE : cout << "epipe" << endl ; break ;
                default : cout << "errno = " << errno ;
            }
        }

        cout << "Zzzzzzzz.........." << endl ;

        usleep ( 500000 ) ;

        cout << "Awaken..." << endl ;
        cout << "Bytes read = " << ( r = read ( fd, cA, 7 ) ) << endl ;

        if ( r == -1 )
        {
            switch ( errno )
            {
                case EAGAIN : cout << "eagain" << endl ; sleep ( 1 ) ; break ;
                case EBADF : cout << "ebadf" << endl ; break ;
                case EFAULT : cout << "efault" << endl ; break ;
                case EINTR : cout << "eintr" << endl ; break ;
                case EINVAL : cout << "einval" << endl ; break ;
                case EIO : cout << "eio" << endl ; break ;
                case EISDIR : cout << "eisdir" << endl ; break ;
                default : cout << "errno = " << errno ;
            }
        }

        for ( int x = 0 ; x < 8 ; ++x )
        {
            cout << dec << static_cast<short>( cA[x] ) << "\t"
                << hex << static_cast<short>( cA[x] ) << "\t"
                << cA[x] << endl ;
        }

        cout << "\n---END---" << endl ;

        sleep ( 1 ) ;
    }
}
 
Not sure if it`s worth noting, but this is the first time I`m using anything from Technologic Systems. So I`m not farmiliar with the stuff yet. Is there anything specific to TS-7300 that must be done to use the serial ports?

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