mirror of
https://github.com/eried/portapack-mayhem.git
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73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
/*
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* Copyright (C) 2015 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 "portapack_persistent_memory.hpp"
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#include "hal.h"
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#include <algorithm>
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#include <utility>
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namespace portapack {
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namespace persistent_memory {
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/* TODO: This is widely applicable. Factor this to somewhere useful. */
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template<class T>
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struct range_t {
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const T minimum;
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const T maximum;
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const T& clip(const T& value) const {
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return std::max(std::min(value, maximum), minimum);
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}
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void reset_if_outside(T& value, const T& reset_value) const {
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if( (value < minimum ) ||
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(value > maximum ) ) {
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value = reset_value;
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}
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}
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};
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using ppb_range_t = range_t<ppb_t>;
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constexpr ppb_range_t ppb_range { -99000, 99000 };
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/* struct must pack the same way on M4 and M0 cores. */
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struct data_t {
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ppb_t correction_ppb;
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};
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static_assert(sizeof(data_t) <= 0x100, "Persistent memory structure too large for VBAT-maintained region");
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static data_t* const data = reinterpret_cast<data_t*>(LPC_BACKUP_REG_BASE);
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ppb_t correction_ppb() {
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ppb_range.reset_if_outside(data->correction_ppb, 0);
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return data->correction_ppb;
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}
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void set_correction_ppb(const ppb_t new_value) {
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data->correction_ppb = ppb_range.clip(new_value);
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}
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} /* namespace persistent_memory */
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} /* namespace portapack */
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