portapack-mayhem/firmware/application/hw/encoder.cpp
2023-07-27 16:45:39 +02:00

108 lines
3.2 KiB
C++

/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "encoder.hpp"
#include "utility.hpp"
#include "portapack.hpp"
#include "portapack_persistent_memory.hpp"
// Now supporting multiple levels of rotary encoder dial sensitivity
//
// Portapack H2 normally has a 30-step encoder, meaning one step (pulse) every
// 12 degrees of rotation.
//
// For each encoder "pulse" there are 4 state transitions, and we can choose
// between looking at all of them (high sensitivity), half of them (medium/default),
// or one quarter of them (low sensitivity).
static const int8_t transition_map[][16] = {
// Normal (Medium) Sensitivity -- default
{
0, // 0000: noop
0, // 0001: ccw start
0, // 0010: cw start
0, // 0011: rate
1, // 0100: cw end
0, // 0101: noop
0, // 0110: rate
-1, // 0111: ccw end
-1, // 1000: ccw end
0, // 1001: rate
0, // 1010: noop
1, // 1011: cw end
0, // 1100: rate
0, // 1101: cw start
0, // 1110: ccw start
0, // 1111: noop
},
// Low Sensitivity
{
0, // 0000: noop
0, // 0001: ccw start
0, // 0010: cw start
0, // 0011: rate
1, // 0100: cw end
0, // 0101: noop
0, // 0110: rate
0, // 0111: ccw end
-1, // 1000: ccw end
0, // 1001: rate
0, // 1010: noop
0, // 1011: cw end
0, // 1100: rate
0, // 1101: cw start
0, // 1110: ccw start
0, // 1111: noop
},
// High Sensitivity
{
0, // 0000: noop
-1, // 0001: ccw start
1, // 0010: cw start
0, // 0011: rate
1, // 0100: cw end
0, // 0101: noop
0, // 0110: rate
-1, // 0111: ccw end
-1, // 1000: ccw end
0, // 1001: rate
0, // 1010: noop
1, // 1011: cw end
0, // 1100: rate
1, // 1101: cw start
-1, // 1110: ccw start
0, // 1111: noop
},
};
int_fast8_t Encoder::update(
const uint_fast8_t phase_0,
const uint_fast8_t phase_1) {
state <<= 1;
state |= phase_0;
state <<= 1;
state |= phase_1;
// dial sensitivity setting is stored in pmem
return transition_map[portapack::persistent_memory::config_encoder_dial_sensitivity()][state & 0xf];
}