From: tnp@invalid.invalid   
      
   On 12/01/2025 18:45, Brian Gregory wrote:   
   > On 25/12/2024 10:02, mm0fmf wrote:   
   >> 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.   
   >   
   > Doesn't the PICO SDK include some FreeRTOS examples?   
      
   It does. If You cant live without a pre-emptive multtaskking solution   
      
   >   
   > Do you really need Zephr RTOS rather than FreeRTOS?   
   >   
   > Note though, that I'm not sure if the examples have the ability to use   
   > both cores yet, I remember that initially they just allowed   
   > multi-threading using a single core on the PICO.   
   >   
   > If it was me I think I might just write my own RTOS that worked the same   
   > way I was originally taught to do multi-threading (using Dykstra's   
   > semaphores and not much else) rather than having to learn and understand   
   > how somebody else thought it should be done.   
   >   
   +1 for that.   
      
   --   
   I would rather have questions that cannot be answered...   
   ...than to have answers that cannot be questioned   
      
   Richard Feynman   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)