Toggle On/Off Button

I want to use a single button to toggle LinuxCNC on and off. I though I could do it like this:


That turns the power on once, but not off. If I turn it off on the screen, the button won't do anything the second time. I was a little unclear reading the toggle2nist wiki, and it can be read that you need a regular toggle upstream of the toggle2nist. I tried adding it, but it still didn't work. There's another input pin that I didn't connect (toggle2nist.0.is-on)

I also considered using two and gates and a not gate along with the halui.machine.is-on signal, but I'm thinking that might oscillate.

Does anyone already have some code for this that works?

I'll answer my own question. In hindsight, it's simple, but the documentation is confusing.

Here's the working code:

In words:
Connect the button to a toggle2. Connect the toggle2 to a toggle2nist. You must have a toggle2 upstream of a toggle2nist. Connect the on, off, and is-on pins on the desired control to the pins with the same name on the toggle2nist.

Works great.

thanks for your example !!!!
i tried the same code for 3 button and 2 works fine but 1 dont work.

WORKS FINE
net joy-on-machine toggle.0.in <= input.0.btn-base
net pwr-btn toggle2nist.0.in <= toggle.0.out
net tog-on toggle2nist.0.is-on <= halui.machine.is-on
net pwr-on halui.machine.on <= toggle2nist.0.on
net pwr-off halui.machine.off <= toggle2nist.0.off

net joy-on-microlube toggle.1.in <= input.0.btn-trigger-happy17
net microlube-btn toggle2nist.1.in <= toggle.1.out
net microlube-tog-on toggle2nist.1.is-on <= halui.mist.is-on
net microlube-on halui.mist.on <= toggle2nist.1.on
net microlube-off halui.mist.off <= toggle2nist.1.off

DONT WORK
net joy-tog-laser toggle.2.in <= input.0.btn-trigger-happy18
net laser-btn toggle2nist.2.in <= toggle.2.out
net laser-tog-on toggle2nist.2.is-on <= halui.lube.is-on
net laser-on halui.lube.on <= toggle2nist.2.on
net laser-off halui.lube.off <= toggle2nist.2.off

i dont know why ??
have you an idea ??

I guess you not enable the third button.
loadrt   toggle2nist    count=3
and 
addf   toogle2nist.2    servo-thread
should be in your *.hal.
If you unsure post your hal and we could correct together.

Thanks for the reply, Chris. It's been a while since I wrote this, and I don't remember it very well any more!
Julien83, your code looks OK to me. Have you tried to look at each of the pin names using Halcmd or Halscope, and see which names are and are not working as you expect? This is how I debug things. If there are not enough instances of the logical pins declared as Chris mentioned, they won't show up there..

Thanks 10k and Chris sorry for my late answer.
When i check with halmetre i don't see any mistake.
In attached file my custom_postgui.hal


Best regard