101 lines
2.1 KiB
C++
101 lines
2.1 KiB
C++
/*
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* Copyright (C) 2017 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 "backlight.hpp"
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#include "portapack_io.hpp"
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namespace portapack {
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void BacklightOnOff::on() {
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if( !is_on() ) {
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io.lcd_backlight(true);
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on_ = true;
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}
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}
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void BacklightOnOff::off() {
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if( is_on() ) {
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io.lcd_backlight(false);
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on_ = false;
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}
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}
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void BacklightCAT4004::set_level(const value_t value) {
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auto target = value;
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// Clip target value to valid range.
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if( target < 0 ) {
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target = 0;
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}
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if( target > maximum_level ) {
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target = maximum_level;
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}
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if( is_on() ) {
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pulses(target);
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} else {
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level_ = target;
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}
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}
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void BacklightCAT4004::on() {
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if( !is_on() ) {
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io.lcd_backlight(true);
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halPolledDelay(ticks_setup);
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on_ = true;
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// Just enabled driver, initial value is maximum.
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const auto target_level = level();
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level_ = maximum_level;
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pulses(target_level);
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}
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}
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void BacklightCAT4004::off() {
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if( is_on() ) {
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io.lcd_backlight(false);
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chThdSleepMilliseconds(ms_pwrdwn);
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on_ = false;
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}
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}
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void BacklightCAT4004::pulses(value_t target) {
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while(level() != target) {
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pulse();
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}
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}
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void BacklightCAT4004::pulse() {
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io.lcd_backlight(false);
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halPolledDelay(ticks_lo);
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io.lcd_backlight(true);
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halPolledDelay(ticks_hi);
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level_ -= 1;
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if( level_ < 0 ) {
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level_ = levels() - 1;
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}
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}
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} /* namespace portapack */
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