Re: Re Comport Question

Winfried Ritsch via Pd-list <[email protected]> Wed, 02 Jul 2025 09:34:49 +0200
Newsgroups	gmane.comp.multimedia.puredata.general
Organization	Institut für Elektronische Musik und Akustik
Message-ID	<12700766.O9o76ZdvQC@schulze>
A guess:

If there is an USB-Chip like the CH240 on the board which communicates with 
the arduino uC, it is important which baudrate you use  between the chip and 
arduino, therefore you have to set the baudrate in the arduino the same as in 
the comport using:

  Serial.begin(baudrate). 

So set the same in the Arduino sketch and comport like 
 `Serial.begin(115200)`

mfg winfried

Am Freitag, 27. Juni 2025, 10:00:58 CEST schrieb Dan Wilcox:
> To double-check, are you sure the problem is not in the Arduino sketch?
> Python exhibiting the same behavior tips to that IMO. A quick search yields
> a similar issue due to using an int for larger baud values:
> 
> https://arduino.stackexchange.com/questions/67568/serial-port-fails-with-spe
> eds-greater-than-19200
> > On Jun 27, 2025, at 2:51 AM, Jim Ruxton <[email protected]> wrote:
> > 
> > 
> > I'm not clear how this works. Because if I change the baud rate it
> > definitely stops any communication between the laptop  and the Arduino so
> > baud rate must have some meaning in this case. I also tried using a
> > python program I wrote and got the same behaviour  of working up to 19200
> > then stopping so I don't think it's an issue with Pure Data. Maybe a
> > cable issue?> 
> >> Note that Arduino is usually (or always?) connected through an USB device
> >> which emulates a serial device (hence the comport).
> >> 
> >> In this case the baud rate has no meaning (the baud rate is only used by
> >> physical UARTs).
> >> 
> >> Le jeu. 26 juin 2025 à 00:06, Antoine Rousseau <[email protected]
> >> <mailto:[email protected]>> a>> 
> >> écrit :
> >> > With the latest comport 1.3 (available on Deken) you can set the baud
> >> > rate  up to 4000000, if your system allows it. See
> >> > https://git.iem.at/pd/comport
> >> > 
> >> > Le mer. 25 juin 2025 à 22:53, Alexandros Drymonitis <[email protected]
> >> > <mailto:[email protected]>> a>> > 
> >> > écrit :
> >> >> How did you find such a limitation? You can use it with a 115,200 baud
> >> >> rate just fine on any OS (including Linux).
> >> >> 
> >> >> On 6/25/25 23:50, Jim Ruxton wrote:
> >> >> > I'm using the comport object to speak to an Arduino. I'm finding the
> >> >> > fastest baud rate I could use was 19200.  I'm on Linux. Would anyone
> >> >> > know if this is a limitation of the object in Linux or if there is
> >> >> > something else going on. I'd like to send data faster if possible.
> >> >> > 
> >> >> > ---
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> 
> --------
> Dan Wilcox
> danomatika.com <http://danomatika.com/>
> robotcowboy.com <http://robotcowboy.com/>


-- 
- ao.Univ.Prof. DI Winfried Ritsch
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