Remove the 300ms heater control delay?

nefelim4ag · October 6, 2024, 10:16am

I think this is more or less a proper fix for eliminating delay:

github.com/Klipper3d/klipper

heaters: drop control delay

Klipper3d:master ← nefelim4ag:heaters-pwm-now

opened 10:04AM - 06 Oct 24 UTC

nefelim4ag

+26 -9

Heaters control is reactive, the faster we apply new PWM - the faster we will se…e a response. Add command to directly apply PWM as fast as it arrives. As a bonus, we relaxed time constraints, `Timer Too Close` should happen "never". As a safety check, we still have `Missed scheduling of next digital out event`. This code is mostly related to this topic/comment: https://klipper.discourse.group/t/remove-the-300ms-heater-control-delay/17771/11 I'm not sure about the right value for `reqclock`. If I understood the code correctly the `reqclock=0` command should be sent in the next batch. This is more like a simple and safe solution because we just avoid timer calculation on the host. I think the proper way to do this for heaters is to make another timer function and update fields `on_duration, off_duration, end_time` on each command arrival. Thanks.

Topic		Replies	Views
Discussion/Proposal: small heater control improvements General Discussion	2	174	December 3, 2024
Testing request: Heater response time improvement Developers	2	469	March 26, 2023
Experiment with "First Order Plus Delay Time" (FOPDT) temperature tracking Developers	19	1596	April 20, 2022
Configurable ADC update rate Developers	8	282	January 2, 2025
Default [extruder] smooth_time is too long causing temperature oscillations General Discussion	22	9553	September 4, 2021

Remove the 300ms heater control delay?

Related topics