eurorack/deprecated/midi2cv/drivers/encoder.h

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// Copyright 2013 Emilie Gillet.
//
// Author: Emilie Gillet (emilie.o.gillet@gmail.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
// See http://creativecommons.org/licenses/MIT/ for more information.
//
// -----------------------------------------------------------------------------
//
// Driver for rotary encoder.
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#pragma once
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#include <stm32f3xx_hal_conf.h>
#include "stm32f3xx_hal_gpio.h"
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#include "stmlib/stmlib.h"
class Encoder {
public:
Encoder() { }
~Encoder() { }
void Init();
void Debounce();
inline bool released() const {
return switch_state_ == 0x7f;
}
inline bool just_pressed() const {
return switch_state_ == 0x80;
}
inline bool pressed() const {
return switch_state_ == 0x00;
}
inline bool pressed_immediate() const {
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return !HAL_GPIO_ReadPin(GPIOC, GPIO_PIN_15);
//return !GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_15);
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}
inline int32_t increment() const {
int32_t increment = 0;
uint8_t a = quadrature_decoding_state_[0];
uint8_t b = quadrature_decoding_state_[1];
if ((a & 0x03) == 0x02 && (b & 0x03) == 0x00) {
increment = -1;
} else {
if ((b & 0x03) == 0x02 && (a & 0x03) == 0x00) {
increment = 1;
}
}
return increment;
}
private:
uint8_t switch_state_;
uint8_t quadrature_decoding_state_[2];
DISALLOW_COPY_AND_ASSIGN(Encoder);
};
extern Encoder encoder;