Raspberry Pi 4 & MESA 7i92

motmod: already exists

is the likely reason LinuxCNC is not starting
This maybe due to a hal file error or a previous failed
LinuxCNC run

You should be able to use pncconf to create a template hal/ini file set
(say for a 5i25) and just change the driver and board name and perhaps some
GPIO numbers to get a working configuration

Thanks Peter! Finally linuxcnc is up and running.


Now I need to use one encoder from mesa 7c81 but differs a bit from the linuxcnc module version. I need to use the encoder as a simple counter (just input A in counter-mode).

Is there any example using an encoder from a mesa card?

Thanks!

You can use the normal encoder counter as a simple (A only) counter by setting
the encoders counter-mode parameter true. This sets the encoder counter into UP/DOWN
mode. Beware that the "B" input sets the count direction in UP/DOWN mode.

Thanks Peter!

You can use the normal encoder counter

What do you mean "normal-encoder"? The software module provided by linuxcnc? I want to use the hardware module from 7c81 to relief my RPi3 cpu workload.

I already have running the software encoder. I want to use the hardware one that the 7c81 provides.
I'm using a RPi3 so I don't want to overload the cpu, that's why I decide to add a 7c81 to the project.

Thanks!

I mean the HM2 hardware encoder module has a UP/DOWN mode

ok, I use

# IO Pin 014 (P1-21): Encoder #0, pin A (Input)
setp hm2_7c81.0.encoder.00.counter-mode true

I get a perfect square signal from the scope but when I connect to the P1-21 pin from the 7c81 it keeps the level high.

BTW
But halshow shows it as an OUT pin. So... :huh:
No count detected in halshow.

What I'm doing wrong?