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@pbrdmn
Last active Dec 16, 2022
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Banana - Firmware for banana macro pad
/*
Banana
Demonstrating tap behaviour with on/off debouncing.
*/
#include "Keyboard.h"
#define DEBOUNCE_TIME 50
#define TIMEOUT 2000
#define NUM_KEYS 8
int pins[] = { 7, 8, 9, 10, 16, 14, 15, 18 };
char keys[] = { KEY_ESC, KEY_F13, KEY_F14, KEY_F15, KEY_F16, KEY_F17, KEY_F18, KEY_F19 };
bool prevVal[NUM_KEYS];
int timePressed[NUM_KEYS];
int now = 0;
boolean readSwitch(int i) {
// return quickly if debouncing
if (timePressed[i] + DEBOUNCE_TIME > now) return prevVal[i];
// read new button value
bool val = digitalRead(pins[i]);
// if state change
if (val != prevVal[i]) {
if (val == LOW) {
// record when press started
timePressed[i] = now;
} else {
// calculate press duration
int duration = now - timePressed[i];
// handle button press for duration
if (duration < DEBOUNCE_TIME) {
// ignore noise
} else if (duration < TIMEOUT) {
// handle tap
Keyboard.write(keys[i]);
} else {
// held too long
}
}
prevVal[i] = val;
}
// Clock Rollover - millis rolls over every 49 days or so
if (timePressed[i] > now) {
timePressed[i] = 0;
}
// Return pin val
return prevVal[i];
}
void setup() {
for (int i = 0; i < NUM_KEYS; i++) {
pinMode(pins[i], INPUT_PULLUP);
prevVal[i] = LOW;
timePressed[i] = 0;
}
Keyboard.begin();
}
void loop() {
now = millis();
for (int i = 0; i < NUM_KEYS; i++) {
readSwitch(i);
}
}
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