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#include "input.h"
#define CLK_PIN 2
#define DT_PIN 3
#define SW_PIN 4
Encoder encoder(CLK_PIN, DT_PIN);
void setup_input() {
pinMode(SW_PIN, INPUT_PULLUP);
}
#define KNOB_DIR -1
uint32_t read_knob() {
uint32_t rotate = KNOB_DIR * encoder.read() / 4;
if(rotate != 0) {
encoder.write(0);
}
return rotate;
}
// button physical state
#define PRESSED 0
#define RELEASED 1
uint8_t pstate = RELEASED;
#define DEBOUNCE_CYCLES 3
uint8_t debounce;
uint8_t debounced_read() {
byte read = digitalRead(SW_PIN);
if (read != pstate && ++debounce >= DEBOUNCE_CYCLES) {
pstate = read;
debounce = 0;
}
return pstate;
}
// button logical state
#define DOWN 0
#define UP 1
#define LONGPRESS 2
uint8_t lstate = UP;
#define LONGPRESS_MS 500
uint32_t pressed_at;
uint8_t read_button() {
uint8_t read = debounced_read();
switch(lstate) {
case UP:
if(read == PRESSED) {
lstate = DOWN;
pressed_at = millis();
}
break;
case DOWN:
if(millis() - pressed_at >= LONGPRESS_MS) {
lstate = LONGPRESS;
return EVENT_HOLD;
}
if(read == RELEASED) {
lstate = UP;
return EVENT_CLICK;
}
break;
case LONGPRESS:
if(read == RELEASED) lstate = UP;
break;
}
return EVENT_NONE;
}
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