mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-22 07:57:43 +00:00
84 lines
2.9 KiB
C++
84 lines
2.9 KiB
C++
/*
|
|
* Copyright (C) 2014 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.
|
|
*/
|
|
|
|
#include "tuning.hpp"
|
|
|
|
#include "utility.hpp"
|
|
|
|
namespace tuning {
|
|
namespace config {
|
|
|
|
namespace {
|
|
|
|
constexpr rf::Frequency low_band_second_lo_frequency(const rf::Frequency target_frequency) {
|
|
return 2650000000 - (target_frequency / 7);
|
|
}
|
|
|
|
constexpr rf::Frequency high_band_second_lo_regions_2_and_3(const rf::Frequency target_frequency) {
|
|
return (target_frequency < 5100000000)
|
|
? (2350000000 + ((target_frequency - 3600000000) / 5))
|
|
: (2500000000 + ((target_frequency - 5100000000) / 9))
|
|
;
|
|
}
|
|
|
|
constexpr rf::Frequency high_band_second_lo_frequency(const rf::Frequency target_frequency) {
|
|
return (target_frequency < 3600000000)
|
|
? (2170000000 + (((target_frequency - 2740000000) * 57) / 86))
|
|
: high_band_second_lo_regions_2_and_3(target_frequency)
|
|
;
|
|
}
|
|
|
|
Config low_band(const rf::Frequency target_frequency) {
|
|
const rf::Frequency first_lo_frequency = target_frequency + low_band_second_lo_frequency(target_frequency);
|
|
const rf::Frequency second_lo_frequency = first_lo_frequency - target_frequency;
|
|
const bool mixer_invert = true;
|
|
return { first_lo_frequency, second_lo_frequency, rf::path::Band::Low, mixer_invert };
|
|
}
|
|
|
|
Config mid_band(const rf::Frequency target_frequency) {
|
|
return { 0, target_frequency, rf::path::Band::Mid, false };
|
|
}
|
|
|
|
Config high_band(const rf::Frequency target_frequency) {
|
|
const rf::Frequency first_lo_frequency = target_frequency - high_band_second_lo_frequency(target_frequency);
|
|
const rf::Frequency second_lo_frequency = target_frequency - first_lo_frequency;
|
|
const bool mixer_invert = false;
|
|
return { first_lo_frequency, second_lo_frequency, rf::path::Band::High, mixer_invert };
|
|
}
|
|
|
|
} /* namespace */
|
|
|
|
Config create(const rf::Frequency target_frequency) {
|
|
/* TODO: This is some lame code. */
|
|
if( rf::path::band_low.contains(target_frequency) ) {
|
|
return low_band(target_frequency);
|
|
} else if( rf::path::band_mid.contains(target_frequency) ) {
|
|
return mid_band(target_frequency);
|
|
} else if( rf::path::band_high.contains(target_frequency) ) {
|
|
return high_band(target_frequency);
|
|
} else {
|
|
return { };
|
|
}
|
|
}
|
|
|
|
} /* namespace config */
|
|
} /* namespace tuning */
|