encoder/ClickEncoder.cpp at master · Overtuner/encoder · GitHub

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// ----------------------------------------------------------------------------

// Rotary Encoder Driver with Acceleration

// Supports Click, DoubleClick, Long Click

// Timer-based rotary encoder logic by Peter Dannegger

// http://www.mikrocontroller.net/articles/Drehgeber

// ----------------------------------------------------------------------------

#include "ClickEncoder.h"

// ----------------------------------------------------------------------------

// Button configuration (values for 1ms timer service calls)

#define ENC_BUTTONINTERVAL 10 // check button every x milliseconds, also debouce time

#define ENC_DOUBLECLICKTIME 600 // second click within 600ms

#define ENC_HOLDTIME 1200 // report held button after 1.2s

// ----------------------------------------------------------------------------

// Acceleration configuration (for 1000Hz calls to ::service())

#define ENC_ACCEL_TOP 3072 // max. acceleration: *12 (val >> 8)

#define ENC_ACCEL_INC 25

#define ENC_ACCEL_DEC 2

// ----------------------------------------------------------------------------

#if ENC_DECODER != ENC_NORMAL

# ifdef ENC_HALFSTEP

// decoding table for hardware with flaky notch (half resolution)

const int8_t ClickEncoder::table[16] __attribute__((__progmem__)) = {

0, 0, -1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, -1, 0, 0

};

# else

// decoding table for normal hardware

const int8_t ClickEncoder::table[16] __attribute__((__progmem__)) = {

0, 1, -1, 0, -1, 0, 0, 1, 1, 0, 0, -1, 0, -1, 1, 0

};

# endif

#endif

// ----------------------------------------------------------------------------

ClickEncoder::ClickEncoder(uint8_t A, uint8_t B, uint8_t BTN, uint8_t stepsPerNotch, bool active)

: doubleClickEnabled(true), accelerationEnabled(true),

delta(0), last(0), acceleration(0),

button(Open), steps(stepsPerNotch),

pinA(A), pinB(B), pinBTN(BTN), pinsActive(active)

{

uint8_t configType = (pinsActive == LOW) ? INPUT_PULLUP : INPUT;

pinMode(pinA, configType);

pinMode(pinB, configType);

pinMode(pinBTN, configType);

if (digitalRead(pinA) == pinsActive) {

last = 3;

}

if (digitalRead(pinB) == pinsActive) {

last ^=1;

}

// ----------------------------------------------------------------------------

// call this every 1 millisecond via timer ISR

void ClickEncoder::service(void)

{

bool moved = false;

unsigned long now = millis();

if (accelerationEnabled) { // decelerate every tick

acceleration -= ENC_ACCEL_DEC;

if (acceleration & 0x8000) { // handle overflow of MSB is set

acceleration = 0;

}

#if ENC_DECODER == ENC_FLAKY

last = (last << 2) & 0x0F;

if (digitalRead(pinA) == pinsActive) {

last |= 2;

}

if (digitalRead(pinB) == pinsActive) {

last |= 1;

}

uint8_t tbl = pgm_read_byte(&table[last]);

if (tbl) {

delta += tbl;

moved = true;

}

#elif ENC_DECODER == ENC_NORMAL

int8_t curr = 0;

if (digitalRead(pinA) == pinsActive) {

curr = 3;

}

if (digitalRead(pinB) == pinsActive) {

curr ^= 1;

}

int8_t diff = last - curr;

if (diff & 1) { // bit 0 = step

last = curr;

delta += (diff & 2) - 1; // bit 1 = direction (+/-)

moved = true;

}

#else

# error "Error: define ENC_DECODER to ENC_NORMAL or ENC_FLAKY"

#endif

if (accelerationEnabled && moved) {

// increment accelerator if encoder has been moved

if (acceleration <= (ENC_ACCEL_TOP - ENC_ACCEL_INC)) {

acceleration += ENC_ACCEL_INC;

}

// handle button

#ifndef WITHOUT_BUTTON

static uint16_t keyDownTicks = 0;

static uint8_t doubleClickTicks = 0;

static unsigned long lastButtonCheck = 0;

if (pinBTN > 0 // check button only, if a pin has been provided

&& (now - lastButtonCheck) >= ENC_BUTTONINTERVAL) // checking button is sufficient every 10-30ms

{

lastButtonCheck = now;

if (digitalRead(pinBTN) == pinsActive) { // key is down

keyDownTicks++;

if (keyDownTicks > (ENC_HOLDTIME / ENC_BUTTONINTERVAL)) {

button = Held;

}

if (digitalRead(pinBTN) == !pinsActive) { // key is now up

if (keyDownTicks /*> ENC_BUTTONINTERVAL*/) {

if (button == Held) {

button = Released;

doubleClickTicks = 0;

}

else {

#define ENC_SINGLECLICKONLY 1

if (doubleClickTicks > ENC_SINGLECLICKONLY) { // prevent trigger in single click mode

if (doubleClickTicks < (ENC_DOUBLECLICKTIME / ENC_BUTTONINTERVAL)) {

button = DoubleClicked;

doubleClickTicks = 0;

}

else {

doubleClickTicks = (doubleClickEnabled) ? (ENC_DOUBLECLICKTIME / ENC_BUTTONINTERVAL) : ENC_SINGLECLICKONLY;

}

keyDownTicks = 0;

}

if (doubleClickTicks > 0) {

doubleClickTicks--;

if (--doubleClickTicks == 0) {

button = Clicked;

}

#endif // WITHOUT_BUTTON

}

// ----------------------------------------------------------------------------

int16_t ClickEncoder::getValue(void)

{

int16_t val;

cli();

val = delta;

if (steps == 2) delta = val & 1;

else if (steps == 4) delta = val & 3;

else delta = 0; // default to 1 step per notch

sei();

if (steps == 4) val >>= 2;

if (steps == 2) val >>= 1;

int16_t r = 0;

int16_t accel = ((accelerationEnabled) ? (acceleration >> 8) : 0);

if (val < 0) {

r -= 1 + accel;

}

else if (val > 0) {

r += 1 + accel;

}

return r;

}

// ----------------------------------------------------------------------------

#ifndef WITHOUT_BUTTON

ClickEncoder::Button ClickEncoder::getButton(void)

{

ClickEncoder::Button ret = button;

if (button != ClickEncoder::Held) {

button = ClickEncoder::Open; // reset

}

return ret;

}

#endif

encoder/ClickEncoder.cpp at master · Overtuner/encoder · GitHub

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