It's very likely the sound card is using a lot more bandwidth of the USB
hub than the arduino. If it's not a laptop you can usually plug into a
different hub on the same machine.
The random dropouts of the serial connection sound like a problem with
the cable or connectors, or else something is plugged into the arduino
that's taking too much current from the USB.
Martin
On 2011-07-09 11:26, Pierre Massat wrote:
The problem isn't really solved at all.
The USB soundcard doesn't seem to completely prevent [comport] to detect
my uno board (I've been playing with both plugged in for the past 2
hours). But [comport] seems to be a little temperamental. I have to open
and close Pd several times, and change the USB port i'm using, for it to
detect the arduino board (though changing the port may not have any
impact). Opening and closing the port i'm using in [comport] doesn't
seem to have any effect either.
The thing is, as i said in a previous post, that there's something weird
about my serial ports on my ubuntu machine. The Arduino IDE detects my
boards about every other time, or just looses it for no apparent reason.
So maybe it's a problem with Ubuntu? [comport] seems to have a much more
predictable behaviour in windows (which i can't use because i need low
latency).
Any Gandalf out there to help me out?
pierre
2011/7/9 Martin Peach <[email protected]
<mailto:[email protected]>>
On 2011-07-09 08:48, Pierre Massat wrote:
UPDATE : comport is now working as expected, and my arduino uno
board is
now friends with my USB soundcard.
So what was the problem?
I guess it's high time i started reading the first volume of
Harry Potter.
Maybe read some Crowley about banishing daemons before plugging in...
Martin
Pierre
2011/7/9 Ingo <[email protected] <mailto:[email protected]>
<mailto:[email protected] <mailto:[email protected]>>>
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: [email protected] <mailto:[email protected]>
<mailto:[email protected] <mailto:[email protected]>__>
[mailto:[email protected]
<mailto:[email protected]> <mailto:[email protected]
<mailto:[email protected]>__>] 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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