Re: shell object on Raspberry PI 4, GPIO control via pinctrl

Roman Haefeli <[email protected]> Sun, 22 Feb 2026 02:20:34 +0100

Newsgroups	gmane.comp.multimedia.puredata.general
Message-ID	<[email protected]>

On Sun, 2026-02-22 at 01:18 +0100, Simon Iten wrote:
> 
> However if I send multiple pinctrl commands in a short timespan some
> are dropped.

Yeah, [shell] can only execute one command at the time. When [shell] is
still busy with the last command, it'll simply ignore the current call.

Anyway, you may want to try [command] which is a fork of [shell] with
more features. [command] outputs the exit code when the execution of
the command has completed. However, you still need to buffer your calls
so that they are executed one after another. You'll find [command] in
Deken.

>  Also, running pinctrl set 5.6.13 op dl for example does not work (it
> should pull low those three outputs at once and works in the terminal
> just fine) But PD also automagically adds spaces after the commas
> once the message box is not edited anymore.

That's not a [shell] specific issue, but is how Pd parses messages in
general. A comma in message box is actually a delimiter for messages.
By using unescaped commas you actually create multiple messages
'pinctrl set 5', '6', and '13 op dl'. 

'exec pinctrl set 5\,6\,13 op dl' seems to work with [command]

> 
> Are these known limitations of shell or is there a workaround to run
> multiple commands at once? Adding & or ; to the end of the message
> sent to shell does not work...

I don't know about &, but ';' is also a Pd delimiter for sending
messages.

Roman

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