>>Hi all,
>>
>>in my driver for our usb-serial converter I want to pass the received data
>>back.
>>But after every
>>tty_insert_flip_char(tty, data[i], 0);
>>call, my write method is called with data[i] or something else (0x5E, 0x40,
>>0x41 mostly).
>>
>>What could be the reason for this?
>>Who calls my write method?
>
> As I said before in private email, I have seen this before with some tty
> drivers I've written. But it does not happen when using a serial
> program (like minicom) but only when using "cat". Have you implemented
> any set_termios or ioctl callbacks in your driver yet?
>
Yes, but they do nothing. I tried it with and without set_termios and/or
ioctl in my driver. Is it possible that I must pass the ioctl calls to the tty
or configure the tty depending on the ioctl arguments?
>
>>Is there a tty or anything-else-layer between the usb_serial driver and the
>>application which communicates with /dev/ttyUSBx?
>
>
> The data is getting looped back from the tty layer itself. I've traced
> it pretty deep into there, but didn't spend the time to really find out
> why it was happening.
>
>
>>(The app doesn't receive the data)
>
>
> What kind of app?
The app (our test app) uses a ct-api.so to communicate with the serial port.
(It works fine with "normal" serial ports)
> Is it using the termios calls in glibc to set the
> serial port settings up properly?
It uses the
struct termios n_par;
..set c_[i|o|l]flag...
tcsetattr(port->PortData.Serial.Handle, TCSANOW, &n_par);
method to set up the serial port.
Is there another mailing list, where I can post questions regarding serial ports?
>
> thanks,
>
> greg k-h
Regards,
Thomas
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