mirror of
https://github.com/eried/portapack-mayhem.git
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101 lines
3.1 KiB
C++
101 lines
3.1 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 "ch.h"
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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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namespace {
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constexpr rf::Frequency low_band_second_lo_frequency(const rf::Frequency target_frequency) {
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return 2650000000 - (target_frequency / 7);
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}
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constexpr rf::Frequency high_band_second_lo_regions_2_and_3(const rf::Frequency target_frequency) {
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return (target_frequency < 5100000000)
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? (2350000000 + ((target_frequency - 3600000000) / 5))
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: (2500000000 + ((target_frequency - 5100000000) / 9))
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;
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}
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constexpr rf::Frequency high_band_second_lo_frequency(const rf::Frequency target_frequency) {
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return (target_frequency < 3600000000)
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? (2150000000 + (((target_frequency - 2750000000) * 60) / 85))
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: high_band_second_lo_regions_2_and_3(target_frequency)
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;
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}
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Config low_band(const rf::Frequency target_frequency) {
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const rf::Frequency first_lo_frequency = target_frequency + low_band_second_lo_frequency(target_frequency);
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const rf::Frequency second_lo_frequency = first_lo_frequency - target_frequency;
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return {
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.first_lo_frequency = first_lo_frequency,
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.second_lo_frequency = second_lo_frequency,
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.rf_path_band = rf::path::Band::Low,
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.baseband_q_invert = true,
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};
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}
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Config mid_band(const rf::Frequency target_frequency) {
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return {
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.first_lo_frequency = 0,
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.second_lo_frequency = target_frequency,
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.rf_path_band = rf::path::Band::Mid,
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.baseband_q_invert = false,
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};
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}
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Config high_band(const rf::Frequency target_frequency) {
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const rf::Frequency first_lo_frequency = target_frequency - high_band_second_lo_frequency(target_frequency);
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const rf::Frequency second_lo_frequency = target_frequency - first_lo_frequency;
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return {
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.first_lo_frequency = first_lo_frequency,
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.second_lo_frequency = second_lo_frequency,
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.rf_path_band = rf::path::Band::High,
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.baseband_q_invert = false,
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};
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}
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} /* namespace */
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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( target_frequency < rf::path::band_low.min ) {
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return { };
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} else if( target_frequency < rf::path::band_low.max ) {
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return low_band(target_frequency);
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} else if( target_frequency < rf::path::band_mid.max ) {
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return mid_band(target_frequency);
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} else if( target_frequency < rf::path::band_high.max ) {
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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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