Marlin: Z_DUAL_STEPPER_DRIVERS won't home

[Kaiwol1990]

Since I've updated to RC7 my z axis won't home anymore. It's just moving up a liitel bit and then stops.
I cheked for Endstops etc. IF I move the axis over the manual controls it moves in both directions. If I change back to RC6 everithing works like a charme, so i think theres an Buck somewhere.

My Setup;
CoreXY
RUMBA Board
Dual Z
DRV8825 Drivers

[Kaiwol1990]

So i have investigated a little bit more and it seems that the bug only occurs when i have

define Z_DUAL_ENDSTOPS active.

And if so the M119 command dosn't responde an z2 endstop, but if I change the following lines in Conditionals_post.h it shows up, but still dosn't home (it just moves up a little bit).
#define Z2_MAX_PIN 36
//#define Z2_MAX_PIN X_MAX_PIN
#undef USE_XMAX_PLUG

And if I use only one Endstop for Z_Max erverthing works fine.
I hope sombody can help, because im note very into C++ programming.

[thinkyhead]

Do you see the same issue if you use RCBugFix?
We might have fixed this issue in the interim since RC7 was released.

[Kaiwol1990]

Yes still the same if i try the RCBugFix

[thinkyhead]

@Nocturnal42 seems to have nailed it. The issue has been patched in RCBugFix and another PR #5097 is pending to prevent the wrong endstop bits being set when Z2 is triggered.

[Kaiwol1990]

Good work !

it works fine now if i use the same setting as @Nocturnal42. But i got still some strange errors:

1. it only works with the Y_Max pin, if i use the X_Max pin it still just moves up a little bit an won't home.
2. i don't get an Z2 endstop reading if i send an M119, unless i aktivate
   #define USE_YMAX_PLUG
   in configuration.h

But other than that it works now for me.
Thanks for the work

[Nocturnal42]

Works with both for me. Have you tried it with USE_XMAX_PLUG enabled? You need to have the plug enabled in order to use something attached to that port, that would also be why it doesn't show in with a M119. Sounds like it needs some more sanity checking.

[thinkyhead]

But i got still some strange errors

@Kaiwol1990 Post your updated configuration if you still haven't solved them.

[Kaiwol1990]

Yeah had USE_XMAX_PLUG enabled and it's working well, also shows me Z2 when i send an M119, but also shows xMax. So just an "cosmetic" bug.

Will try it later today again wit Y_Max to be sure it wasn't an simple mistake and also post my configuration files.

[thinkyhead]

That's odd, because in Conditionals_post.h we have:

#define IS_Z2_OR_PROBE(P) (P == Z2_MIN_PIN || P == Z2_MAX_PIN || P == Z_MIN_PROBE_PIN)
. . .
#define HAS_X_MAX (PIN_EXISTS(X_MAX) && !IS_Z2_OR_PROBE(X_MAX_PIN))

So the HAS_X_MAX flag should be false and prevent the display of the "X max" in M119.

[Nocturnal42]

When did you last refresh the RCBugFix tree? I believe there is a time gap between the two commits where you'd get one fix but not the other.

[Kaiwol1990]

Realy seems to be strange. As i said im gone take a look later today, i'm not near my printer by now.
Maybe it's already fixed, hadn't implemented #5097 at first.

Refreshed yesterday around 11 PM (GMT+01).

[Kaiwol1990]

I may have found it, the lines you postet above aren't implemented in my Conditionals_post.h.
So i will download the newest Version later and try again.

Thanks for the help

[Kaiwol1990]

So had time to get to my printer and it works, the new RCBugFix takes care of everthing.

Thanks for your help and commitment!

[thinkyhead]

@Kaiwol1990 Good news! Thanks for the update.