mirror of
https://github.com/eried/portapack-mayhem.git
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ee2e57d702
* Experimental encoder debouncing * Experimental encoder debouncing * Clang * Comment changed
77 lines
2.4 KiB
C++
77 lines
2.4 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 "encoder.hpp"
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#include "utility.hpp"
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#include "portapack.hpp"
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#include "portapack_persistent_memory.hpp"
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// Transition map for rotary encoder phase bits
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// 00 -> 01 -> 11 -> 10 cw
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// 00 -> 10 -> 11 -> 01 ccw
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// NB: Bits are swapped versus older FW versions
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static const int8_t transition_map[16] = {
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0, // 00->00: noop
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1, // 00->01: cw start
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-1, // 00->10: ccw start
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0, // 00->11: rate
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-1, // 01->00: ccw end
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0, // 01->01: noop
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0, // 01->10: rate
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1, // 01->11: cw end
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1, // 10->00: cw end
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0, // 10->01: rate
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0, // 10->10: noop
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-1, // 10->11: ccw end
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0, // 11->00: rate
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-1, // 11->01: ccw start
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1, // 11->10: cw start
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0, // 11->11: noop
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};
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// Rotary encoder dial sensitivity (transition ignored if bit is 0)
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static const uint16_t sensitivity_map[] = {
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0x0990, // DIAL_SENSITIVITY_NORMAL
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0x0110, // DIAL_SENSITIVITY_LOW
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0x6996, // DIAL_SENSITIVITY_HIGH
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};
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int_fast8_t Encoder::update(const uint_fast8_t phase_bits) {
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state = ((state << 2) | phase_bits) & 0x0F;
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int_fast8_t direction = transition_map[state];
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// Require 2 state changes in same direction to register movement -- for additional level of contact switch debouncing
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if (direction == prev_direction) {
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if ((sensitivity_map[portapack::persistent_memory::config_encoder_dial_sensitivity()] & (1 << state)) == 0)
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return 0;
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return direction;
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}
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// It's normal for transition map to return 0 between every +1/-1, so discarding those
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if (direction != 0)
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prev_direction = direction;
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return 0;
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}
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