Re: Re Comport Question

I'm almost sure that the physical data transfer in the USB cable doesn't
depend on the baudrate setting. This setting is just a parameter that the
USB device can use the way it wants.

In the case the device implements a physical UART, then the setting
controls the UART baudrate.

In other cases it can be used for smth else. For instance, the Raspberry pi
Pico interprets a predefined baudrate value as a command to switch to
bootloader.

Btw: what is your actual Arduino board?


Le ven. 27 juin 2025 à 02:51, Jim Ruxton <[email protected]> a écrit :

>
> 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]> 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]>
>> 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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