It's odd that the lines

    /* no post processing */
    new->c_oflag &= ~OPOST;

and

    /* always nocanonical, this means raw i/o no terminal */
    new->c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);

_are_ present in open_serial() in comport.c.
That should disable all postprocessing of traffic.

Martin

On Tue, May 14, 2019 at 7:58 AM Roman Haefeli <reduzent@gmail.com> wrote:

On Tue, 2019-05-14 at 13:27 +0200, Christof Ressi wrote:
> > > So, neither the OS nor the Pd or [comport] version seem to make
> > > any
> >
> > difference.
>
> check my last two mails, I think this is macOS/Linux issue. can you
> try my fix?

Yeah, I will when I have access to an Arduino (or other serial device)
and report back. Thanks for looking into this.

Roman
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