On Fri, May 12, 2023 at 8:00 PM onefang <onefang_devuan@???> wrote:
>
> On 2023-05-13 06:46:51, jeremy ardley via Dng wrote:
> > On 13/5/23 03:43, o1bigtenor via Dng wrote:
> >
> > Greetings
> >
> > (Is this OT - - - - dunno - - - that's why the goofy label!)
> >
> > I am in the beginning throes of an embedded system (SoC, and/or
> > microcontroller) design.
> >
> > Have been reading somewhat on the use of RTOS vs and OS (thinking
> > perhaps FreeRTOS and Devuan). My initial problem is a weighing 'cell'
> > where I'm weighing liquids being deposited in a 'jar'.
> > (A second would be items deposited (and then removed in stages) from a
> > 4 wheel cart.)
> >
> > You only need to use RTOS etc when you are doing actions that require
> > repeatable millisecond timings across multiple threads of execution and
> > with hardware interrupts.
>
> Linux has a RT kernel, I use it on my Devuan desktop for music
> production. Did I bring this back on topic? B-)
Hmmmmmm - - - - this sounds like I might get my cake AND get to eat it
too - - - - thank you - - - - very useful information!!!!
>
> > Even then RTOS etc aren't absolutely required. For instance ArduPilot in
> > the original form doesn't have any form of RTOS and instead relies on a
> > cooperative apartment threaded model where each function advertises how
> > long it will take to run and a scheduler function calls each in turn based
> > on time slots.
> >
> > For most use cases its easier to go the really simple route and use
> > Arduino, or the slightly more complex route with a full Linux SOC using
> > Raspberry Pi OS or Armbian or even Devuan.
> >
> > The only issue is Arduino is reliable with multiple I2C devices while the
> > Linux derived systems can have minor problems where an I2C interface is
> > done in software. Conversely Arduino requires a lot of effort on
> > communication protocols of any complexity.
> >
> > An option can be to use an Arduino for low level control under command of
> > a Linux based SOC board.
>
> That's what I did for my last embedded project. Linux on the the SOC
> board with the application written in C, and assembler on a PIC
> controller for the hardware interface. The PIC could have been done in
> C, but I decided assembler would be more interesting.
>
In process of learning my first language - - - - using Python for a number of
reasons. Maybe not quite as useful for the 'deep down' stuff but it does also
get used in robotics so should be able to get me to where I wish to go.
Thank you for some very intriguing ideas!!!!
::
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