/* * 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. */ #ifndef __BACKLIGHT_H #define __BACKLIGHT_H #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 */ #endif