portapack-mayhem/firmware/common/backlight.hpp

121 lines
2.5 KiB
C++

/*
* Copyright (C) 2017 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.
*/
#pragma once
#include <cstdint>
namespace portapack {
class Backlight {
public:
using value_t = int_fast8_t;
virtual ~Backlight() = default;
virtual value_t levels() const = 0;
virtual void set_level(const value_t value) = 0;
virtual value_t level() const = 0;
virtual void increase() = 0;
virtual void decrease() = 0;
virtual void on() = 0;
virtual void off() = 0;
virtual bool is_on() const = 0;
};
class BacklightBase : public Backlight {
public:
void increase() override {
set_level(level() + 1);
}
void decrease() override {
set_level(level() - 1);
}
};
class BacklightOnOff : public BacklightBase {
public:
value_t levels() const override {
return 1;
}
void set_level(const value_t) override {
}
value_t level() const override {
return levels() - 1;
}
void on() override;
void off() override;
bool is_on() const override {
return on_;
}
private:
static constexpr value_t maximum_level = 1;
bool on_ { false };
};
class BacklightCAT4004 : public BacklightBase {
public:
value_t levels() const override {
return maximum_level + 1;
}
void set_level(const value_t value) override;
value_t level() const override {
return level_;
}
void on() override;
void off() override;
bool is_on() const override {
return on_;
}
private:
static constexpr value_t initial_brightness = 25;
static constexpr value_t maximum_level = 31;
static constexpr uint32_t ticks_setup = 204e6 * 10e-6;
static constexpr uint32_t ms_pwrdwn = 5;
static constexpr uint32_t ticks_lo = 204e6 * 1e-6;
static constexpr uint32_t ticks_hi = 204e6 * 1e-6;
value_t level_ { initial_brightness };
bool on_ { false };
void pulses(value_t target);
void pulse();
};
} /* namespace portapack */