HOME_DIR not working if set to -1

[PhilippeGonze]

Hi, I recently purchased the Minitronics V2.0 for replacing the board of my printrbot simple metal.
I use repetier host ver 2.1.6

I am trying to get the X_HOME_DIR and Z_HOME_DIR to -1 (Min mode) as my endstops are at X0 and Z0. Unfortunately, if I set ..._HOME_DIR to -1 the G28 request does not home them any more (no reaction).
M119 does not return any infos on X ad Z endstops.

Y_HOME_DIR is set to 1 (max mode) as it is at Y150.
G28 homes the Y perfectly.
In fact, it just "skips" the homing of X and Z
M119 returns the state of Y enstop correctly.

Once I try setting Y_HOME_DIR to -1 (min mode), the G28 fails for X,Y and Z.
M119 does not return any endstop state any more.

Turning all HOME_DIR to 1 enables the G28 for X,Y and Z
of course, in the wrong direction for X and Z.
M119 then returns the state of all endstops correctly.

To summarise : HOME_DIR does not work if set to -1

Manual moves (G00, G01) works perfectly on all axis independently of HOME_DIR
I tried to reverse the stepper direction and the stepper physical wiring but it does not solve my problem as prints would be mirrored in X and Z (which is not very convenient :-p )

I do not have any compiling errors
I am usine the latest Arduino IDE that I just downloaded.
Board manager is 1.0.2 for SAMD21
The computer is new and runs on windows 10 pro, it also didn't work on my older computer on windows 7.
I use repetier host ver 2.1.6

Firmware version is the 4.3.7_beta that is supplied on reprapworld by @brupje
https://github.com/brupje/MK4duo/releases/download/v4.3.7-1/MK4duo-minitronics20.zip

My setup is exactly the one from the link hereunder but with the following changes :
#define MECHANISM MECH_CARTESIAN
#define X_HOME_DIR -1
#define Y_HOME_DIR 1
#define Z_HOME_DIR -1
#define ENDSTOPPULLUP_XMIN false
#define ENDSTOPPULLUP_YMIN false
#define ENDSTOPPULLUP_ZMIN true //as active inductive sensor fixed on hotend
//#define ENDSTOP_INTERRUPTS_FEATURE
#define DEFAULT_AXIS_STEPS_PER_UNIT {160, 160, 4056, 160, 625, 625, 625}
#define DEFAULT_Kp {10.97, 40, 40, 40} // Kp for H0, H1, H2, H3
#define DEFAULT_Ki {0.51, 07, 07, 07} // Ki for H0, H1, H2, H3
#define DEFAULT_Kd {59.09, 60, 60, 60} // Kd for H0, H1, H2, H3

I honestly tried most of the features and options that I thought could lead to that problem but with no results yet.
I have been working on this printer for three weeks and this problem kept me awake at night for half that time.
Thank you in advance for your help,

[PhilippeGonze]

@MagoKimbra any ideas ? (X_HOME_DIR not working if set to -1)

[MagoKimbra]

X_HOME_DIR It works perfectly...
when you set X_HOME_DIR -1 what print M119?

[PhilippeGonze]

Thanks for your answer, when I use M119, the M119 only answers with the axis with HOME_DIR that are set to 1.
It seems as if the -1 has a "blocking effet".
In fact, if I try X_HOME_DIR and Z_HOME_DIR to 1, the homing works and M119 too (of course in the wrong direction)

(the complete description of the issue is in the first comment of this issue)

[MagoKimbra]

A ok i see you have minitronics...
in file 2706.h only max pin is defined
#define ORIG_X_MIN_PIN NoPin
#define ORIG_X_MAX_PIN 8
#define ORIG_Y_MIN_PIN NoPin
#define ORIG_Y_MAX_PIN 9
#define ORIG_Z_MIN_PIN NoPin
#define ORIG_Z_MAX_PIN 4

Now i f you use x_min and not x_max you must change pin in this file.
#define ORIG_X_MIN_PIN 8
#define ORIG_X_MAX_PIN NoPin
#define ORIG_Y_MIN_PIN NoPin
#define ORIG_Y_MAX_PIN 9
#define ORIG_Z_MIN_PIN NoPin
#define ORIG_Z_MAX_PIN 4

[PhilippeGonze]

Awesome ! This worked on the first try :-D
A very very very big thank you, you can't imagine how long I tried to solve this.
I never could have done it myself.

--> you, Sir, are my hero !

I made a donation on Marlinkimbra.it to thank you
Have a very nice day

[PhilippeGonze]

OK I might have gotten little bit carried away.
This is not 100% as it should be.

I set
#define X_HOME_DIR -1
#define Y_HOME_DIR 1
#define Z_HOME_DIR -1

and as you wrote, I changed 2706.h to
#define ORIG_X_MIN_PIN 8
#define ORIG_X_MAX_PIN NoPin
#define ORIG_Y_MIN_PIN NoPin
#define ORIG_Y_MAX_PIN 9
#define ORIG_Z_MIN_PIN 4 //because I use a min pin with inductive probe fixed on head
#define ORIG_Z_MAX_PIN NoPin

Now X and Y home perfectly thanks to you but Z only goes up for a few millimeters and down again resulting in a slight elevation of the head but no change in the Z position returned by repetier.

It shoul normally go down until reaching endstop min as Z_HOME_DIR is -1.

M119 works 100% on all endstops but it does not seem to affect the Z axis behaviour.
I disabled software endstops so it should'nt be it.

Best regards,

[MagoKimbra]

Please remove the comments from the line.
#define ORIG_Z_MIN_PIN 4 //because I use a min pin with inductive probe fixed on head
Test probe with M119

[PhilippeGonze]

Ok it is done, I reloaded the firmware but nothing has changed.

G28 homes X and Y correctly, Z goes up for approx 5 mm and down 1-2 mm.
M119 returns the following :
21:17:54.096 : x_min: TRIGGERED
21:17:54.104 : y_max: TRIGGERED
21:17:54.111 : z_min: NOT TRIGGERED
and it reacts correctly if I switch them manually.

Funny stuff, if I home only Z multiple times, it sometimes doesn't go down after going up.
It also sometimes do a little down before going upas usual.

I also tried to restart from sratch on the original file supplied on reprapworld by @brupje
https://github.com/brupje/MK4duo/releases/download/v4.3.7-1/MK4duo-minitronics20.zip
I changed 2706.h as discussed :
//###ENDSTOP
#define ORIG_X_MIN_PIN 8
#define ORIG_X_MAX_PIN NoPin
#define ORIG_Y_MIN_PIN NoPin
#define ORIG_Y_MAX_PIN 9
#define ORIG_Z_MIN_PIN 4
#define ORIG_Z_MAX_PIN NoPin

And in the firmware on arduino IDE only changing those :
#define MECHANISM MECH_CARTESIAN
//#define MECHANISM MECH_DELTA
#define ENDSTOPPULLUP_ZMIN true
#define X_HOME_DIR -1
#define Y_HOME_DIR 1
#define Z_HOME_DIR -1
#define X_MAX_POS 150
#define DEFAULT_Kp {17.33, 40, 40, 40} // Kp for H0, H1, H2, H3
#define DEFAULT_Ki {3.19, 07, 07, 07} // Ki for H0, H1, H2, H3
#define DEFAULT_Kd {23.51, 60, 60, 60} // Kd for H0, H1, H2, H3
#define X_MIN_POS 0
#define Y_MAX_POS 150
#define Y_MIN_POS 0
#define Z_MAX_POS 150
#define DEFAULT_AXIS_STEPS_PER_UNIT {160, 160, 4056, 160, 625, 625, 625}

Still, M119 returns good answers but the Z axis won't home.

[MagoKimbra]

Does the probe work with M119? If when it detects triggered it stops it is normal for it to do it 2 mm before reaching the floor depends on its detection distance ...
The problem is that you have not set that you have a probe, but you are using it as a normal endstop, you have to set that you have a fixed type probe and then you adjust everything with the z probe offset.
When you do the home it stops when it detects, but when the G1 Z0,2 command arrives, for example the first layer will drop to that altitude ...

[PhilippeGonze]

Ok, I changed the following :

in the firmware :
#define ENDSTOPPULLUP_ZPROBE true
#define Z_PROBE_FIX_MOUNTED
#define Z_MIN_PIN NoPin
#define Z_PROBE_PIN ORIG_Z_PROBE_PIN

and in 2706.h
#define ORIG_Z_PROBE_PIN 4
#define ORIG_Z_MIN_PIN NoPin

Now, G28 homes X and Y still perfectly and Z does not move any more.
M119 returns the correct state of all stops (Z being identified as a probe)
23:05:28.492 : x_min: NOT TRIGGERED
23:05:28.501 : y_max: NOT TRIGGERED
23:05:28.516 : z_probe: NOT TRIGGERED

(again I would like to thank you for the awesome support and time on this issue)

[MagoKimbra]

No, if you put the probe and don't have the classic endstop, the probe becomes the endtop z-min
So you don't have to set the probe pin, that remains Z-min
This is error
#define Z_MIN_PIN NoPin
#define Z_PROBE_PIN ORIG_Z_PROBE_PIN

This is correct
#define Z_MIN_PIN ORIG_Z_MIN_PIN
#define Z_PROBE_PIN No_pin
and in 2706.h
#define ORIG_Z_PROBE_PIN Nopin
#define ORIG_Z_MIN_PIN 4

The three endstops must always be there.
Set the probe pin only if you leave the classic z_min end stop for emergency.

[PhilippeGonze]

Allright then, I use the probe as min pin so I changed following your recommendation.
#define Z_MIN_PIN ORIG_Z_MIN_PIN
#define Z_PROBE_PIN NoPin
and in 2706.h
#define ORIG_Z_MIN_PIN 4
#define ORIG_Z_PROBE_PIN NoPin

Now the M119 returns correctly
17:55:34.768 : x_min: NOT TRIGGERED
17:55:34.784 : y_max: NOT TRIGGERED
17:55:34.790 : z_min: NOT TRIGGERED
G28 homes X and Y correctly but Z goes up for a few mm-cm (varying) and then down 1-5mm.

[MagoKimbra]

Stet for mm Z is it ok?

[PhilippeGonze]

no, not at all. The extruder ends up a few centimeters above the bed.
If I G28 Z only, it does exactly the same thing, going up a few cm then down a few mm resulting in an even higer position but the position indicated by repetier does not change.

I tried to "interrupt" the first movement (up) by triggering the inductive probe but it does not seem to change anything : the printer continues going up and then down then stops.