[Bug 208959] USB-serial (mct_u232): bit7=1 when tty is set to cs7?

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=208959

--- Comment #3 from Johan Hovold (johan@kernel.org) ---
On Tue, Aug 25, 2020 at 03:20:48PM +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=208959
> 
> --- Comment #2 from mslade@epic-code.com.au (mslade@epic-code.com.au) ---
> Please clarify what you mean by "converter" here.

I was referring to the USB-serial device.

> FYI to test I was just doing this:
> 
> # stty -F /dev/ttyUSB0 1200 cs7

What is the output of "stty -a -F /dev/ttyUSB0" after this?

> # dd if=/dev/ttyUSB0 bs=1|hd

Try using a terminal program instead and connect the device to another
USB-serial device (e.g. ftdi or pl2303) and see if you can get 7-bit
words to work.

You can also try enabling debugging and provide the relevant bits from
dmesg when you connect, configure and read from the device:

        echo module mct_u232 +p > /sys/kernel/debug/dynamic_debug/control

Johan

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