mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
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81 lines
3.0 KiB
C++
81 lines
3.0 KiB
C++
/*
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* Copyright (C) 2014 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 "tuning.hpp"
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#include "utility.hpp"
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namespace tuning {
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namespace config {
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// Low band <2170 Mhz:
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constexpr rf::Frequency low_band_second_lo_frequency(const rf::Frequency target_frequency) {
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return 2650'000'000 - (target_frequency / 7);
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}
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Config low_band(const rf::Frequency target_frequency) {
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const rf::Frequency second_lo_frequency = low_band_second_lo_frequency(target_frequency);
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const rf::Frequency first_lo_frequency = target_frequency + second_lo_frequency;
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const bool mixer_invert = true;
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return {first_lo_frequency, second_lo_frequency, rf::path::Band::Low, mixer_invert};
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}
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// Mid band 2170-2740 Mhz:
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Config mid_band(const rf::Frequency target_frequency) {
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const rf::Frequency second_lo_frequency = target_frequency;
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const rf::Frequency first_lo_frequency = 0;
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const bool mixer_invert = false;
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return {first_lo_frequency, second_lo_frequency, rf::path::Band::Mid, mixer_invert};
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}
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// High band >2740 Mhz:
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constexpr rf::Frequency high_band_second_lo_frequency(const rf::Frequency target_frequency) {
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if (target_frequency < 3600'000'000)
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return (2170'000'000 + (((target_frequency - 2740'000'000) * 57) / 86));
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else if (target_frequency < 5100'000'000)
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return (2350'000'000 + ((target_frequency - 3600'000'000) / 5));
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else
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return (2500'000'000 + ((target_frequency - 5100'000'000) / 9));
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}
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Config high_band(const rf::Frequency target_frequency) {
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const rf::Frequency second_lo_frequency = high_band_second_lo_frequency(target_frequency);
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const rf::Frequency first_lo_frequency = target_frequency - second_lo_frequency;
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const bool mixer_invert = false;
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return {first_lo_frequency, second_lo_frequency, rf::path::Band::High, mixer_invert};
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}
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Config create(const rf::Frequency target_frequency) {
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/* TODO: This is some lame code. */
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if (rf::path::band_low.contains(target_frequency)) {
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return low_band(target_frequency);
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} else if (rf::path::band_mid.contains(target_frequency)) {
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return mid_band(target_frequency);
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} else if (rf::path::band_high.contains(target_frequency)) {
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return high_band(target_frequency);
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} else {
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return {};
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}
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}
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} /* namespace config */
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} /* namespace tuning */
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