Initial firmware commit.

firmware/application/tuning.cpp

@@ -0,0 +1,100 @@
+/*
+ * 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 "ch.h"
+
+#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)
+		? (2150000000 + (((target_frequency - 2750000000) * 60) / 85))
+		: 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;
+	return {
+		.first_lo_frequency = first_lo_frequency,
+		.second_lo_frequency = second_lo_frequency,
+		.rf_path_band = rf::path::Band::Low,
+		.baseband_q_invert = true,
+	};
+}
+
+Config mid_band(const rf::Frequency target_frequency) {
+	return {
+		.first_lo_frequency = 0,
+		.second_lo_frequency = target_frequency,
+		.rf_path_band = rf::path::Band::Mid,
+		.baseband_q_invert = 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;
+	return {
+		.first_lo_frequency = first_lo_frequency,
+		.second_lo_frequency = second_lo_frequency,
+		.rf_path_band = rf::path::Band::High,
+		.baseband_q_invert = false,
+	};
+}
+
+} /* namespace */
+
+Config create(const rf::Frequency target_frequency) {
+	/* TODO: This is some lame code. */
+	if( target_frequency < rf::path::band_low.min ) {
+		return { };
+	} else if( target_frequency < rf::path::band_low.max ) {
+		return low_band(target_frequency);
+	} else if( target_frequency < rf::path::band_mid.max ) {
+		return mid_band(target_frequency);
+	} else if( target_frequency < rf::path::band_high.max ) {
+		return high_band(target_frequency);
+	} else {
+		return { };
+	}
+}
+
+} /* namespace config */
+} /* namespace tuning */