Difference between G28 and M98"homeall.g"?

gloomyandy

@o_lampe One other thought adding a few M574 commands (with no parameters) which outputs what endstops are set, may provide more idea as to what is going on!

fcwilt

@o_lampe said in Difference between G28 and M98"homeall.g"?:

Q: Is there a difference in sending G28 from the console or starting the homeall.g macro directly?

One significant difference is that G28 marks the axis/axes as un-homed before executing the code associated with the given axis/axes.

This can cause code that works with M98 to fail with G28 if the code is trying to move an un-homed axis.

Frederick

o_lampe

@gloomyandy said in Difference between G28 and M98"homeall.g"?:

I'm not sure that what you are doing to clear an endstop is correct. It looks like:
M574 U0

Which sets the endstop for that axis to none, may be the correct way to do this.

I think you are right, I'll test it first thing. I thought I had to free the formerly used pin.

PS: do you know if someone published a mounting case (for 2020 extrusion) for the F407ZG? I couldn't find a drawing which shows the mounting hole pattern...

o_lampe

@o_lampe
PSS: Where can I find more info on the "Z3" endstop, how to attach three switches and such?

gloomyandy

@o_lampe Sorry no idea about a case (i just have mine on my test bench!), @jay_s_uk may have some suggestions.

Freeing things in RRF is a bit messy. This example in the gcode listing:

M574 Z0 P"nil" ; no Z endstop switch, free up Z endstop input

seems to show that both the type 0 and nil pin are required, but looking at the code I'm not sure that is the case. I'd try just setting it to type 0 and see if that does what you want (I need to check again but I seem to remember that a P parameter may take it down a different code path!).

gloomyandy

@o_lampe I didn't know there was a Z3 option, are you sure that is correct, there is the option to specify multiple endstops to match multiple Z motors via separate pins with something like:

M574 Z1 S1 P"io2.in+io3.in" ; Z axis with two motors, individual min endstops, active high

That is covered a little in the RRF GCode docs.

o_lampe

@gloomyandy Hmm, there's Zmin, Zmax and Z3, maybe I have to use them all in the way you described.

gloomyandy

@o_lampe Where have you seen a reference to Z3? I don't see one in the gcode guide and the source code does not seem to have any idea of it, it only has...

	noEndStop = 0,
	lowEndStop = 1,
	highEndStop = 2,

o_lampe

@gloomyandy said in Difference between G28 and M98"homeall.g"?:

Where have you seen a reference to Z3?

That's weird,

I saw it mentioned on mellow fly aliexpress page
there's a Z3 socket onboard
teamgloomys github page mentions it on the pin names page

Supports dual Z-axis printers and three Z-axis printers (the motherboard has a dedicated Z3 limit switch interface).

o_lampe

...back to subject. I found out what caused the error message when calling G28 alone:

G28 automatically tries to home X,Y and Z even when homeZ is not mentioned in homeall.g.
I currently have no Z axis, so there's no endstop defined for Z...
I could probably delete or move homez.g or add M574 Z0 in config.g to supress the error message
deleting an endstop only works with e.g. M574 X0.
Adding P"nil" is wrong

o_lampe

@o_lampe said in Difference between G28 and M98"homeall.g"?:

I could probably delete or move homez.g or add M574 Z0 in config.g to supress the error message

removing/renaming homeZ only led to another error: can't find homeZ.g
So I wrote homeZ with these lines:

M574 Z0
G92 Z0

and no error popped up

Thanks all who tried to help

fcwilt

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