Subj : Re: Pi Pico and Zephyr RTOS
To   : wmartin
From : mm0fmf
Date : Wed Dec 25 2024 10:02:21

On 25/12/2024 00:30, wmartin wrote:
> On 12/24/24 12:47, mm0fmf wrote:
>> Has anyone used the Zephyr RTOS on a Pi Pico or any other smallish
>> system?
>>
>> I'm writing something relatively simple for a Pico in C using the SDK.
>> It doesn't need an RTOS, the old classic cyclic executive paradigm
>> will work fine.
>> At one time I'd have used an 8bit CPU but why faff about when you can
>> get something like a Pico for hardly any cost even if 2x Cortex M0+
>> seems overkill.
> Well, you can have two threads, kinda, with the Pico without an
> RTOS...just split your work between the two cores. I just did a simple
> project using one core to do a com link to a pc for command/response,
> and the other core to do a real-time hardware controller chore. Made it
> painless...

That was my plan. The project has to do simple things like scan a 4x4
keyboard, light assorted LEDs and send strings over the UART at 38k4 to
control something. I'd already decided that I would run all the UART
send/receive on one core and run the control on the other core. That way
the control core remains non-blocking and the UART core can block if needed.

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