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

[Ingo]

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