142 lines
3.4 KiB
C++
142 lines
3.4 KiB
C++
/*
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* This file is part of the "bluetoothheater" distribution
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* (https://gitlab.com/mrjones.id.au/bluetoothheater)
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*
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* Copyright (C) 2018 Ray Jones <ray@mrjones.id.au>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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#include <Arduino.h>
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#include "keypad.h"
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#include "pins.h"
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CKeyPad::CKeyPad()
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{
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// pin scanning
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_debouncedPins = 0;
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_prevPins = 0;
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_lastDebounceTime = millis();
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_debounceDelay = 50;
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// handler
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_lastKey = 0;
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_lastHoldTime = 0;
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_holdTimeout = 0;
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_keyCallback = NULL;
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}
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void
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CKeyPad::init(int Lkey, int Rkey, int Ckey, int Ukey, int Dkey)
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{
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_pins[0] = Lkey;
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_pins[1] = Rkey;
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_pins[2] = Ckey;
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_pins[3] = Ukey;
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_pins[4] = Dkey;
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for(int i=0; i<5; i++)
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pinMode(_pins[i], INPUT);
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}
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uint8_t
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CKeyPad::scanPins()
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{
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uint8_t newPins = 0;
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if(digitalRead(_pins[0]) == LOW) newPins |= key_Left;
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if(digitalRead(_pins[1]) == LOW) newPins |= key_Right;
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if(digitalRead(_pins[2]) == LOW) newPins |= key_Centre;
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if(digitalRead(_pins[3]) == LOW) newPins |= key_Up;
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if(digitalRead(_pins[4]) == LOW) newPins |= key_Down;
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if(newPins != _prevPins) {
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_lastDebounceTime = millis();
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_prevPins = newPins;
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}
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long elapsed = millis() - _lastDebounceTime;
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if (elapsed > _debounceDelay) {
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// whatever the reading is at, it's been there for longer than the debounce
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// delay, so take it as the actual current state:
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_debouncedPins = newPins;
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}
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return _debouncedPins;
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}
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void
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CKeyPad::setCallback(void (*callback)(uint8_t event))
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{
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_keyCallback = callback;
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}
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uint8_t
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CKeyPad::update()
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{
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uint8_t newKey = scanPins();
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// determine edge events
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uint8_t keyChange = newKey ^ _lastKey;
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uint8_t Press = keyChange & newKey; // bits set upon intial press, ONLY
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uint8_t Release = keyChange & ~newKey; // bits set upon intial release, ONLY
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uint8_t Repeat = 0;
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_lastKey = newKey;
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if(Press) {
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#ifdef DBG_KEYPAD
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DebugPort.println("PRESS");
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#endif
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_lastHoldTime = millis();
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_holdTimeout = 350; // initial hold delay
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}
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if(Release) {
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#ifdef DBG_KEYPAD
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DebugPort.println("RELEASE");
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#endif
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_holdTimeout = 0; // cancel repeat
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}
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long tDelta = millis() - _lastHoldTime;
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if(_holdTimeout && (tDelta > _holdTimeout)) {
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#ifdef DBG_KEYPAD
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DebugPort.println("REPEAT");
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#endif
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_holdTimeout = 150; // repeat delay
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_lastHoldTime += _holdTimeout;
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Repeat = newKey;
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}
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if(Press) {
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if(_keyCallback != NULL)
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_keyCallback(keyPressed | Press | newKey);
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return keyPressed | Press;
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}
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if(Release) {
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if(_keyCallback != NULL)
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_keyCallback(keyReleased | Release);
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return (keyReleased | Release);
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}
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if(Repeat) {
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if(_keyCallback != NULL)
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_keyCallback(keyRepeat | Repeat);
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return (keyRepeat | Repeat);
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}
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return 0;
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}
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