First steps with 6i25+7i77 : how to read a home switch ?

Hello,

I am starting with LinuxCNC and MESA boards.

Reading various posts on the forum, I managed to connect all and supply the field power with 24v DC.

I started with what andypugh showed in this topic : forum.linuxcnc.org/9-installing-linuxcnc...nuxcnc-configuration

andypugh wrote:

Open a terminal window and type:

sudo dmesg -c
halrun
loadrt hostmot2
loadrt hm2_pci
show pin *5i25*
exit
dmesg

The "show pin" displays all the HAL pins created by the firmware on the card.

I am able to see all my I/O from the 7i77 :

Using again andypugh suggestion from this topic : forum.linuxcnc.org/38-general-linuxcnc-q...-done-init-mesa-6i25

andypugh wrote:

Just type this at the terminal:

halrun
loadrt hostmot2
loadrt hm2_pci

(Nothing happens with the card without being attached to a real-time thread)

loadrt thtreads
addf hm2_5i25.0.read thread1
addf hm2_5i25.0.write thread1
start
show pin

(I am guessing the next pin name, but it will appear in the list created by the command above, and you can use tab-completion to do most of the typing)

setp hm2_5i25.0.led.cr0 1

Should turn an LED on

setp hm2_5i25.0.led.cr0 0

Should turn it off

I played with the two leds first.

Now I would like to read a home limit switch. I read from the 7i77 manual that I have to wire my switch to power field and to an input terminal of the 7i77, I am ready to do this.

Keeping andypugh hal instructions here above, is "addf hm2_5i25.0.read thread1 " suitable to read such a home limit switch input in case of a 7i77 ?

My plan is to observe from Halscope the changing state when toggling the switch.

Thank you for help.

My machine rebuilt can be seen at : here

Thank you Andy it worked like a charm.

Here the short shooting link : Here