Control panel, MUX wiring help

Hi there. I've this old bosch panel but no idea how to connect this to MESA7i77. No ideia how to MUX wiring this.



Panel routing layout as follows:



So, looking at this, do i need to use a MUX chips to wire against 7i77? Something like this?



I'm searching some info, pic's or drawings about this subject, to compare and aply, i'm having some dificults here... not so skilled on electronics.

You could scan that directly from the 7I77 if you can afford to spare
8 outputs and 5 inputs (assuming the schematic is correct and there are no
electronic parts other than the diodes)

Yes, only diodes inside.
I've multimeter checked and each push button is just closing the loop between Scan# and Data#.

Only inputs/outputs i spend were to limit switches and emergency so, free to do this

So, direct wiring 8 outputs(data#) and 5 inputs(scan#) to 7i77? What kind of code do i need to inplement this on hal config?

I was afraid you would ask...

I think the matrix_kb component would do most of the work
but it will be a fair amount of hal plumbing

After read some posts about matrix_kb, no chance to me.
Is there any other simplier options to reuse this old panel? Multiple mux components? or just create a sized simplier panel with direct push buttons to inputs?

I don't want all the fancier jigs on this machine, if possible reuse things, if not, keep it simple.

Well another solution would be to write your own component that turned those inputs and outputs into meaningful stuff. It would reduce the hal plumbing, but probably not make it much easier if you don't understand C

Grab a 7i70 remove the diodes, connect to the 7i70 inputs to what used to be the Cathode side of the diode and connect all the scan lines to VField. Diagram as shown should use all 48 inputs. Then it should be a one to one button to hal pin setup.

Not sure why you would _not_ use matrix_kb, since its designed for that exact
task. Any other solution that reads all the switches would be more complex
(as you would just be re-creating matrix_kb)

The basics are:

loadrt matrix_kb config=6x8s
setp matrix_kb.0.negative-logic false
addf matrix_kb.0 servo-thread

net row0 matrix_kb.0.row-00-out some_7I77_output_a
net row1 matrix_kb.0.row-01-out some_7I77_output_b
net row2 matrix_kb.0.row-02-out some_7I77_output_c
net row3 matrix_kb.0.row-03-out some_7I77_output_d
net row4 matrix_kb.0.row-04-out some_7I77_output_e
net row5 matrix_kb.0.row-05-out some_7I77_output_f

net col0 matrix_kb.0.col-00-in some_7i77_input_a
net col1 matrix_kb.0.col-01-in some_7i77_input_b
net col2 matrix_kb.0.col-02-in some_7i77_input_c
net col3 matrix_kb.0.col-03-in some_7i77_input_d
net col4 matrix_kb.0.col-04-in some_7i77_input_e
net col5 matrix_kb.0.col-05-in some_7i77_input_f
net col6 matrix_kb.0.col-06-in some_7i77_input_g
net col7 matrix_kb.0.col-07-in some_7i77_input_h

Understood.
I can't get there with my "self knowledge about this programming level. Can you recommend some topics, so i can follow, about this subject?

I would read the hal tutorial:

linuxcnc.org/docs/html/hal/tutorial.html