[PD] Comport problem with Arduino: 13 is coming in as 10
ingo at miamiwave.com
Tue May 14 13:07:17 CEST 2019
I just tested this on another OS.
My older system that did it was a relatively old Ubuntu 11.10 still using
the older [comport] object with Pd-Extended.
Now I tested with a rather new Debian (9.5 / 32bit) and a recent Pd (0.48)
with the latest [comport] object.
Both behave the same way.
If I send a MIDI program change from my EWI to the USB (-MIDI) input I get
the correct program number.
If I use the MIDI Din cable going from the EWI into my Arduino MIDI
interface I get MIDI program #11 instead of #14 (counting from 1-128!).
Still the number 13 gets replaced with 10.
This time the Arduino is a Arduino Micro and not a ProMicro with a different
So, neither the OS nor the Pd or [comport] version seem to make any
> -----Original Message-----
> From: Ingo [mailto:ingo at miamiwave.com]
> Sent: Tuesday, May 14, 2019 12:36 PM
> To: 'Ingo'; 'Roman Haefeli'; pd-list at lists.iem.at
> Subject: RE: [PD] Comport problem with Arduino: 13 is coming in as 10
> Sorry, this was meant to be:
> Carriage Return is 13. Line Feed is 10 (not 0x10).
> > -----Original Message-----
> > From: Pd-list [mailto:pd-list-bounces at lists.iem.at] On Behalf Of Ingo
> > Sent: Tuesday, May 14, 2019 12:31 PM
> > To: 'Roman Haefeli'; pd-list at lists.iem.at
> > Subject: Re: [PD] Comport problem with Arduino: 13 is coming in as 10
> > The strange thing is that I'm using 2 Arduino ProMicro.
> > Sometimes one does it and the other one is fine. Next time both of
> > them do it and next time none of them.
> > It's completely unpredictable. The same Arduino sends the same data
> > that gets interpreted differently when I reopen Pd.
> > So I wouldn't blame the Arduino in this case. I don't expect it to
> > send different values upon reopening Pd.
> > (I'm not sure if I did a hardware restart in between - I'll have to
> > observe
> > this.)
> > However, the Pd programming hasn't changed either ...
> > I know there is some sort of modem code that replaced 13 with 10.
> > Carriage Return is 13. Line Feed is 0x10.
> > In some cases The Carriage Return is either followed or even replaced
> > by Line Feed.
> > It looks like this is happening here.
> > The question is: How can I control this type of Carriage Return
> > I don not my Arduino to be handled as an old modem ...
> > > I have tried Serial.write(13) and Serial.print((char)13) and they
> > > both output 10 in Pd. The work-around I have figured to this is to
> > > write a second byte after every value I send, and in case of sending
> > > a 13, send a unique value to this second byte, so that Pd knows it
> > > should be receiving a 13. It's double the load but in most cases it
> > > shouldn't be a problem, especially when writing raw bytes with
> > I have already a bunch of units out with the same hardware.
> > So changing the programming on the Arduino is not necessarily the best
> > choice.
> > Ingo
> > > -----Original Message-----
> > > From: Pd-list [mailto:pd-list-bounces at lists.iem.at] On Behalf Of
> > > Roman Haefeli
> > > Sent: Tuesday, May 14, 2019 11:38 AM
> > > To: pd-list at lists.iem.at
> > > Subject: Re: [PD] Comport problem with Arduino: 13 is coming in as
> > > 10
> > >
> > > On Tue, 2019-05-14 at 10:00 +0100, Alexandros wrote:
> > > > On 14/5/19 9:45 p. ., Roman Haefeli wrote:
> > > > > Hi Ingo
> > > > >
> > > > > On Tue, 2019-05-14 at 07:38 +0200, Ingo wrote:
> > > > > > I'm getting number 10 instead of 13 from my adruino.
> > > > >
> > > > > This sounds somehow familiar to me, but I can't recall the exact
> > > > > details of the issue nor am I able to find something about it on
> > > > > the web.
> > > > >
> > > > > Have you ruled out any other source besides [comport]? Can you
> > > > > print the data with some other tool to make sure that the
> > > > > Arduino is not messing up the bytes 10 and 13? If it indeed
> > > > > [comport] is the culprit, then it should be quite easy to fix,
> > > > > but then again there we probably would find code that does the
> > > > > translation. I am not sure such code exists.
> > > >
> > > > I have been having the same issue for quite some time now, and
> > > > have posted it in this list in the past.
> > >
> > > Have you ruled out any other culprit? Have checked what is sent with
> > > some means other than [comport], for instance with the Arduino IDE?
> > > I don't have an Arduino at hand, so I don't know the exact
> > > procedure, but maybe there is a way to print data as hex values or so.
> > >
> > > Roman
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