[PD] Comport can't read serial devices when soundcard is plugged in

Pierre Massat pimassat at gmail.com
Sat Jul 9 14:48:52 CEST 2011


UPDATE : comport is now working as expected, and my arduino uno board is now
friends with my USB soundcard.

I guess it's high time i started reading the first volume of Harry Potter.

Pierre

2011/7/9 Ingo <ingo at miamiwave.com>

> Similar problem here. I had an Arduino (USB) and a LCD display (RS232)
> working together very well with two [comport] objects on my old mainboard.
> With the new board either one by themselves is working fine but both of
> them
> connected bidirectional doesn't work. As soon as I connect the serial in
> from the display (which is supposed to get the keypad of the serial
> display)
> I get a lots of crazy data coming in. After a while either [comport] or Pd
> altogether crashes.
>
> The LCD [comport] should only receive digital buttons on/off. While the
> arduino sends buttons plus four analogue INs from a joystick and two foot
> pedals.
> All cables are very short, so the problematic behaviour can't be caused by
> the cable length. Without connecting the serial out of the display to the
> serial in of the computer everything works fine.
>
> I was also suspecting an error in comport where the data of two instances
> of
> two [comport] objects get mixed up. It looks like the analogue data from
> the
> arduino board gets forwarded to the second RS232 [comport] of the LCD.
>
> Ingo
>
>
> ________________________________________
> Von: pd-list-bounces at iem.at [mailto:pd-list-bounces at iem.at] Im Auftrag von
> Pierre Massat
> Gesendet: Samstag, 9. Juli 2011 13:38
> An: pd-list
> Betreff: [PD] Comport can't read serial devices when soundcard is plugged
> in
>
> Hi all!
>
> After having had to deal with a "bug" in pduino (see Arduin is drivin me
> mad), i wrote a small sketch for the board and a patch using comport. It
> was
> working fine until i decided to actually try it with my audio patch.
> It turns out that my external USB soundcard prevents comport from working
> properly. It can't open the arduino board, and can't event detect serial
> devices ("devices" yields an empty message in the console). As soon as i
> unplug the soundcard, everything works fine again.
>
> I think i'm beginning to realize that a lot of things have to be taken care
> off, and i know that my patch and sketch are way to simple to take this
> kind
> of issue into account (i wish i could switch back to Pduino and firmata).
>
> So my question is : is this behaviour normal, or is it bug in comport?
>
> Thanks!
>
> Pierre
>
>
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