Improvements on Jerk-Accel code

[Dietz0r]

Good Morning, here's the first round of improvements on the jerk acceleration code.

• fixed segment planner losing last_segmet_accel value between planner passes
• improved jerk ramp detection for acceleration and deceleration
• new calculation for effective acceleration over block in planner.c to determine between full jerk ramp movements and partial jerk ramp movements

now works with a wider band of jerk settings, recommended is still at least 10x accel as a starting point. jogging issues have been diminished greatly but might still crop up as taking a long time to finish the jogging move or having an excessive last segment decel for tiny movement blocks

thanks to: @andrewmarles and @mintracer @engigeer @MBaadsgaard @fpq437 on the printNC discord for troubleshooting, testing and theorycrafting coding help

Note:
Could you mark the jerk setting in the webbuilder as actively beta and maybe expose the ACCERLERATIONTICKS_PER_SECOND and SEGMENT_BUFFER option to people that are choosing it? those are kind of necessary to finetune the system

[terjeio]

Could you mark the jerk setting in the webbuilder as actively beta and maybe expose the ACCERLERATIONTICKS_PER_SECOND and SEGMENT_BUFFER option to people that are choosing it? those are kind of necessary to finetune the system

Can someone create a Wiki page for this? I can give write access for that.

[Dietz0r]

Can someone create a Wiki page for this? I can give write access for that.

i can do that if you want me to explain how the implementation works and how changing the settings affect it? can i use pictures to visualize the points?

[terjeio]

i can do that if you want me to explain how the implementation works and how changing the settings affect it?

Yes that would be nice. I have opened access now.

can i use pictures to visualize the points?

Sure, there is an images directory that I use for that.