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component toggle "'push-on, push-off' from momentary pushbuttons";
description
"""
┐ ┏──┐ ┏──┐
.br
in : └─────┛ └────────┛ └──
.br
┐ ┌───────────┐
.br
out: └─────┘ └─────
""";
pin in bit in "button input";
pin io bit out "on/off output";
param rw u32 debounce = 2 "debounce delay in periods";
option data toggle_data;
function _ nofp;
license "GPL";
author "John Kasunich";
;;
typedef struct {
int debounce_cntr;
int debounced;
} toggle_data;
FUNCTION(_) {
if (( debounce < 1 ) || ( debounce > 10000 )) {
/* set a sane value, we don't want 2 million second delays */
debounce = 2;
}
if ( in ) {
/* pressed */
data.debounce_cntr++;
if ( data.debounce_cntr >= debounce ) {
data.debounce_cntr = debounce;
if ( data.debounced == 0 ) {
/* toggle output */
out = !out;
}
data.debounced = 1;
}
} else {
/* not pressed */
data.debounce_cntr--;
if ( data.debounce_cntr <= 0 ) {
data.debounce_cntr = 0;
data.debounced = 0;
}
}
}
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