toggle2nist.is-on - what exactly does it do?

Hi all,

I've been fiddling around with HAL to see how it works, and pinched someone else's code and dropped it in custom.hal to see how it works, (see below). I had a minor hiccup, and had to comment out the line "net machine-is-on halui.machine.is-on" in the main hal file, but otherwise it works a treat

#power on/off
net power-btn and2.0.in0 <= (my input)
net power-ok and2.0.in1 not.3.out
net power-not not.0.in <= halui.estop.is-activated
net power-request toggle.0.in <= and2.0.out
net power-toggle toggle2nist.0.in <= toggle.0.out
net power-is-on toggle2nist.0.is-on <= halui.machine.is-on
net power-on halui.machine.on <= toggle2nist.0.on
net power-off halui.machine.off <= toggle2nist.0.off

I sketched out the logic on a bit of paper, and I'm starting to understand some of the hal commands and signals etc. However, I don't quite understand the toggle2nist.is-on bit. It appears that it needs an input or signal - I did use another button input to trigger it for fun. But when used with the input 'halui.machine.is-on', is it acting like some sort of latch, or a sort of logic safety thing?

Cheers,

Steve

Ta John,

So from that link can I safely assume that toggle2nist needs to 'know' the state of the halui device it is controlling via the is-on input if it is to toggle it on/off, and so there is always a requirement for the halui device being toggled to have a bit-out status pin connected to toggle2nist to make it work properly?

cheers,

Steve

Thanks guys,

Now staring to make a strange sort of sense. Certainly scope for more fun with this stuff!

Cheers,

Steve