probe basic lath to define a net spindle-index-en spindle.0.index-enable

hi, I am using a absolute multiturn spindle encoder , it is working but I need to simulate de Z index for G33 and G76
so I define the follow net

net spindle-index-en    and2.2.out => spindle.0.index-enable

but always say spindle-index-en and after some test I found spindle.0.index-enable it is already linked
So I delete may hal and leave just basic things like lcec  etc.. basic to make my ethercat network working 
but any way say the signal is already linked, I made allot names changes and this has the same result   
on ini file I have only a call to this hal file.  
after I comment the net line and run the linuxcnc
On hal show I look for the linked spindle.0.index-enable, and I can toggle  the input spindle.0.index-enable
on bash I look for the variable  [/code]

You don't say what the inputs to and2.2 are. That is probably important.

A problem you will have is that spindle.0.index-enable is a bidirectional HAL pin, so can't be directly connected to the output of an and2 block.

You can probably work around this with linuxcnc.org/docs/stable/html/man/man9/tristate_bit.9.html

But, are you sure that your spindle encoder driver doesn't offer e direct, bidirectional, index-enable pin?

There is an example of an index-simulator HAL component here:
forum.linuxcnc.org/24-hal-components/388...ation?start=0#223508

It's written for a stepper spindle, but should work just as well (or just as badly) for an absolute encoder assuming that the encoder has an integer "counts" output.


I was going to suggest watching one bit of the binary counts value and tristate-bit. But that wouldn't zero the counts on index.

There _is_ a way to do it with a sample-hold to capture the counts at index, then subtracting that from the raw counts, that would need a bitslice, mux_generic (set up for signed int), edge, and tristate-bit HAL component.
It's do-able but at that point the custom HAL component makes more sense.

Dear andypuch

tristate_bit fix it. 

thank you,

net simulation-Zindex near.0.out => and2.0.in0
setp and2.0.in1 1
net index-logic-ok and2.0.out => tristate_bit.0.in

net spindle-index-en tristate_bit.0.out <=> spindle.0.index-enable

net spindle-index-en => tristate_bit.0.out-en

tested and works

Dear 

I think there are some opportunities in absolute encoders field with low information output as the one that I have.
 with only encoder counts in a multi-turn format s32 and encoder spins counter as well as multi-turn format s32.

I make it works but I need to spend some time testing it. but G33 and G76 are working with ethercat absolute encoder as spindle speed and position feedback , and some spontaneous axis following error to debug. ( jitter ? i do not know ).

Thank you.