mirror of
https://github.com/eried/portapack-mayhem.git
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109 lines
4.1 KiB
C++
109 lines
4.1 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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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 2, or (at your option)
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* 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; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "debounce.hpp"
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#include "utility.hpp"
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// Returns TRUE if button state changed (after debouncing)
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bool Debounce::feed(const uint8_t bit) {
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history_ = (history_ << 1) | (bit & 1);
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// "Repeat" handling - simulated button release
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if (repeat_ctr_) {
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// Make sure the button is still being held continuously
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if ((history_ == 0xFF) && !long_press_enabled_) {
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// Simulate button press every REPEAT_SUBSEQUENT_DELAY ticks
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if (--repeat_ctr_ == 0) {
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state_ = !state_;
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repeat_ctr_ = REPEAT_SUBSEQUENT_DELAY / 2;
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return true;
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}
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} else {
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// It's a real button release; stop simulating
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repeat_ctr_ = 0;
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}
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}
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if (state_ == 0) {
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// Previous button state was 0 (released);
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// Has button been held for DEBOUNCE_COUNT ticks?
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if ((history_ & DEBOUNCE_MASK) == DEBOUNCE_MASK) {
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state_ = 1;
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held_time_ = 0;
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// If long_press_enabled_, state() function masks the button press until it's released
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// or until LONG_PRESS_DELAY is reached
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if (long_press_enabled_) {
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pulse_upon_release_ = true;
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return false;
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}
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return true;
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}
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} else {
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// Previous button state was 1 (pressed);
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// Has button been released for DEBOUNCE_COUNT ticks?
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if ((history_ & DEBOUNCE_MASK) == 0) {
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// Button has been released when long_press_enabled_ and before LONG_PRESS_DELAY was reached;
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// allow state() function to finally return a single press indication
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// (in long press mode, apps won't see button press until the button is released)
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if (pulse_upon_release_) {
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// leaving state_==1 for one cycle
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pulse_upon_release_ = 0;
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} else {
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state_ = 0;
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}
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// Reset long_press_occurred_ flag after button is released
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long_press_occurred_ = false;
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return true;
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}
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// Has button been held continuously?
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if (history_ == 0xFF) {
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held_time_++;
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if (pulse_upon_release_) {
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// Button is being held down and long_press support is enabled for this key:
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// if LONG_PRESS_DELAY is reached then finally report that switch is pressed and set flag
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// indicating it was a LONG press
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// (note that repease_support and long_press support are mutually exclusive)
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if (held_time_ == LONG_PRESS_DELAY) {
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long_press_occurred_ = true;
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pulse_upon_release_ = 0;
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held_time_ = 0;
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return true;
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}
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} else if (repeat_enabled_ && !long_press_enabled_) {
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// Repeat support -- 4 directional buttons only (unless long_press is enabled)
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if (held_time_ == REPEAT_INITIAL_DELAY) {
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// Delay reached; trigger repeat code on NEXT tick
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repeat_ctr_ = 1;
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held_time_ = 0;
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}
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}
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} else {
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// Button not continuously pressed; reset counter
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held_time_ = 0;
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}
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}
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return false;
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}
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