toggle2nist

EMC uses 'nist-logic' for most IO, meaning there is one on-switch/signal to switch a thing on, one off-switch/signal to switch it off, and one indicator-signal to tell you the state.

To connect momentary-on pushbuttons to EMC you need at least the toggle component, but I've found that it doesn't work that great with things that can be set/reset by other parts of EMC. For example the coolant state might be set from the AXIS checkbox, G-code, MDI, a pyVCP button, or a hardware button through halui.

I made toggle2nist to set the coolant state with a momentary-on pushbutton. The hardware button connects to a toggle, and the toggle output connects to toggle2nist. It also needs the is-on signal, and produces as outputs the on/off signals (to halui.flood.on and halui.flood.off in this case).

component toggle2nist "toggle button to nist logic";

pin in  bit in;

pin in  bit is_on;

pin out bit on;

pin out bit off;

variable int old_in;

variable int to_state=0;

function _;

license "GPL";

;;

FUNCTION(_)  {

if (in!=old_in) /* a toggle has occurred */ {

    if (is_on) {   /* turn OFF if it's on */

        on=0;

        off=1;

        to_state=0;

    }

    else if (!is_on) { /* turn ON if it's off */

        on=1;

        off=0;

        to_state=1;

    }

}

else {

/* reset pins when we see the desired state */

    if (to_state==is_on) {

        on=0;

        off=0;

    }

}

old_in=in;

}