How to delay until a next increment of time occurs ?

[Luciano Ramalho]

Mr. Wieser, I haven't seen you mention which library you're using to
write to GPIO with Python. I know of two options:

1) RPi.GPIO: https://sourceforge.net/projects/raspberry-gpio-python/
-- the more popular option
2) WiringPy: https://github.com/WiringPi/WiringPi-Python -- an
alternative with better performance

See (7 year old) benchmarks here:

https://codeandlife.com/2012/07/03/benchmarking-raspberry-pi-gpio-speed/

WiringPy has it's own delay function, which may have better
performance than using any Python alternative. See an example here:

https://github.com/WiringPi/WiringPi-Python/blob/master/examples/softpwm.py

RPi.GPIO has dedicated PWM functions, which may or may not solve your
problem. See docs here:

https://sourceforge.net/p/raspberry-gpio-python/wiki/PWM/

Cheers,

Luciano


On Wed, Nov 13, 2019 at 3:27 PM R.Wieser <address at not.available> wrote:
>
> Dennis,
>
> > So... you need to adjust for the time spent in processing between
> > calls to sleep().
>
> That was my first thought too, but any code calculating that adjustment
> before ultimatily calling sleep itself can also be interrupted.    With that
> in mind I was aiming/hoping for something with a /very/ short path between
> the calculation and executing the sleep (as in: none at all, done by the
> system itself).
>
> > The creep could be mitigated some by having the handler's first
> > action being to start the next timer instance, and then doing "stuff".
>
> Yup.   But the cost of using that command is generating threads - which some
> search results warned against (not sure why though).
>
> The best solution I can think of would be a build-in (hardware?) timer which
> would generate "ticks" until its stopped.
>
> Regards,
> Rudy Wieser
>
>
> --
> https://mail.python.org/mailman/listinfo/python-list



-- 
Luciano Ramalho
|  Author of Fluent Python (O'Reilly, 2015)
|     http://shop.oreilly.com/product/0636920032519.do
|  Technical Principal at ThoughtWorks
|  Twitter: @ramalhoorg