Homing sensors not working correctly with RRF3.3.0 stable

dc42

@marco-bona I have added this to my list to investigate.

User3D

@dc42 I have faced a similar issue , when upgraded from 3.3beta Feb1 release to to RRF 3.3.0.
Axes X-Y are connected on EXP1XDs and I have end-limits on both the low and high ends. After upgrade, Axes started hitting the end-limits on the other(high) ends . I suppose It is the same issue as of @marco-bona & due to incorrect homing, axes hit the endstops.

NOTE: After downgrading to previous release i.e. (3.3beta Feb1) , problem is gone.

Do you concur the issues are similar?

Marco Bona

@dc42 , Thanks.
@User3D , yesterday I did some tests and it seems that adding a G4 between moves gets around the problem. I haven't tried to print but homing works. I enclose an example, let me know if you solve.

G1 H1 U-150 F2000                                                               
G4 P100                                                                         
G1 U5 F1000                                                                     
G4 P100
G1 H1 U-15 F500                                                                
G4 P100

With M400 it doesn't work, if you still have problems increase the delay

User3D

@marco-bona Thanks! Did you try printing? If yes then can you confirm that its not step skipping and homing issue only?

Marco Bona

@user3d, hello, I tried to make some prints but I can not give you a certain answer because on expansion board I have 2 axes that I do not usevery often during printing. From what I see I don't think there are any problems but I'm not entirely sure

dc42

@marco-bona said in Homing sensors not working correctly with RRF3.3.0 stable:

yesterday I did some tests and it seems that adding a G4 between moves gets around the problem.

I believe the cause is that there is a minimum permitted interval between successive reports from an endstop switch connected via CAN. The reason is to prevent contact bounce and interference spikes generating excessive CAN traffic. This interval is currently set to 30ms. Therefore, it should be sufficient to ensure there is at least 30ms elapsed time between the end of the first G1 H1 command and the start of the second G1 H1 command; and that there is at least 60ms between the start of the middle G1 command and the end of the second G1 H1 command. These delays can be achieved by making each of the second and third G1 commands take at least 30ms, or using G4 delay commands, or a combination of both.

In RRF 3.4beta4 I will either implement a fix or reduce the minimum interval.

Marco Bona

@dc42, thanks for reply

dc42

@marco-bona if you install firmware 3.4beta3 then I can provide a further update to the expansion or tool board firmware that I believe will fix this issue.

Marco Bona

@dc42, now I'm on vacation, I hope to be able to try the new release early next week

Marco Bona

@dc42, hi, I have installed latest internal release, prelease 3.4 beta 3+1 on mainboard while on the expansion board there is the latest release3.4 beta 3, leaving a delay although minimal in the moves it works correctly, the only strange thing that known is that I have to load configuration file 2 times to be able to load the parameters on the expansion board, I don't know if it is due to the fact that some updates are missing on expansion board. With this release I'm getting perfect prints, great job !!