Am Montag, 22. Juni 2020 07:45:44 UTC+2 schrieb Andrew P. Lentvorski:
>
> Pinmuxing *must* be done from privileged mode (effectively: Linux 
> kernel/kernel module only).
>

Correct.

Neither userspace nor PRU can change a pinmux.
>

Not correct. In a libpruio configuration all members of system-group 
'pruio' can pinmux from user space. That's why libpruio development is as 
easy as Arduino development, but much more powerful.
 

> If you must have a pin that changes direction and you need to control it 
> from the PRU, you can use the digital I/O's on the IEP (industrial ethernet 
> peripheral).  I can confirm that this works.
>

Off-topic.


@ P B

You asked for GPIO. In order to control the flow rate, you could also 
control the pumps by PWM signals.

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