Started work on ACARS RX

Added ACARS frequencies file
Moved non-implemented apps menu items down

firmware/application/CMakeLists.txt

@@ -109,6 +109,7 @@ set(CSRC
 # setting.
 set(CPPSRC
 	main.cpp
+	${COMMON}/acars_packet.cpp
 	${COMMON}/adsb.cpp
 	${COMMON}/adsb_frame.cpp
 	${COMMON}/ais_baseband.cpp
@@ -245,6 +246,7 @@ set(CPPSRC
 	apps/ui_touchtunes.cpp
 	apps/ui_view_wav.cpp
 	apps/ui_whipcalc.cpp
+	apps/acars_app.cpp
 	apps/analog_audio_app.cpp
 	apps/ais_app.cpp
 	apps/tpms_app.cpp

firmware/application/apps/acars_app.cpp

@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2018 Furrtek
+ *
+ * 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 "acars_app.hpp"
+
+#include "baseband_api.hpp"
+#include "portapack_persistent_memory.hpp"
+
+using namespace portapack;
+using namespace acars;
+
+#include "string_format.hpp"
+#include "utility.hpp"
+
+void ACARSLogger::log_raw_data(const acars::Packet& packet, const uint32_t frequency) {
+	std::string entry = "Raw: F:" + to_string_dec_uint(frequency) + "Hz ";
+	
+	// Raw hex dump of all the bytes
+	for (size_t c = 0; c < packet.length(); c += 8)
+		entry += to_string_hex(packet.read(c, 8), 8) + " ";
+	
+	log_file.write_entry(packet.received_at(), entry);
+}
+
+/*void ACARSLogger::log_decoded(
+	const acars::Packet& packet,
+	const std::string text) {
+	
+	log_file.write_entry(packet.timestamp(), text);
+}*/
+
+namespace ui {
+
+void ACARSAppView::update_freq(rf::Frequency f) {
+	set_target_frequency(f);
+	portapack::persistent_memory::set_tuned_frequency(f);	// Maybe not ?
+}
+
+ACARSAppView::ACARSAppView(NavigationView& nav) {
+	baseband::run_image(portapack::spi_flash::image_tag_acars);
+
+	add_children({
+		&rssi,
+		&channel,
+		&field_rf_amp,
+		&field_lna,
+		&field_vga,
+		&field_frequency,
+		&check_log,
+		&console
+	});
+	
+	receiver_model.set_sampling_rate(2457600);
+	receiver_model.set_baseband_bandwidth(1750000);
+	receiver_model.enable();
+	
+	field_frequency.set_value(receiver_model.tuning_frequency());
+	update_freq(receiver_model.tuning_frequency());
+	field_frequency.set_step(receiver_model.frequency_step());
+	field_frequency.on_change = [this](rf::Frequency f) {
+		update_freq(f);
+	};
+	field_frequency.on_edit = [this, &nav]() {
+		// TODO: Provide separate modal method/scheme?
+		auto new_view = nav.push<FrequencyKeypadView>(receiver_model.tuning_frequency());
+		new_view->on_changed = [this](rf::Frequency f) {
+			update_freq(f);
+			field_frequency.set_value(f);
+		};
+	};
+	
+	check_log.set_value(logging);
+	check_log.on_select = [this](Checkbox&, bool v) {
+		logging = v;
+	};
+	
+	logger = std::make_unique<ACARSLogger>();
+	if (logger)
+		logger->append("acars.txt");
+}
+
+ACARSAppView::~ACARSAppView() {
+	receiver_model.disable();
+	baseband::shutdown();
+}
+
+void ACARSAppView::focus() {
+	field_frequency.focus();
+}
+
+// Useless ?
+void ACARSAppView::set_parent_rect(const Rect new_parent_rect) {
+	View::set_parent_rect(new_parent_rect);
+}
+
+void ACARSAppView::on_packet(const acars::Packet& packet) {
+	std::string alphanum_text = "";
+	
+	if (!packet.is_valid())
+		console.writeln("\n\x1B\x0INVALID PACKET");
+	else {
+		std::string console_info;
+		
+		console_info = "\n" + to_string_datetime(packet.received_at(), HM);
+		console_info += " REG:" + packet.registration_number();
+		
+		console.write(console_info);
+	}
+	
+	// Log raw data whatever it contains
+	if (logger && logging)
+		logger->log_raw_data(packet, target_frequency());
+}
+
+void ACARSAppView::set_target_frequency(const uint32_t new_value) {
+	target_frequency_ = new_value;
+	receiver_model.set_tuning_frequency(new_value);
+}
+
+uint32_t ACARSAppView::target_frequency() const {
+	return target_frequency_;
+}
+
+} /* namespace ui */

firmware/application/apps/acars_app.hpp

@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2018 Furrtek
+ *
+ * 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.
+ */
+
+#ifndef __ACARS_APP_H__
+#define __ACARS_APP_H__
+
+#include "ui_widget.hpp"
+#include "ui_receiver.hpp"
+#include "ui_rssi.hpp"
+
+#include "log_file.hpp"
+
+#include "acars_packet.hpp"
+
+class ACARSLogger {
+public:
+	Optional<File::Error> append(const std::string& filename) {
+		return log_file.append(filename);
+	}
+	
+	void log_raw_data(const acars::Packet& packet, const uint32_t frequency);
+	//void log_decoded(const acars::Packet& packet, const std::string text);
+
+private:
+	LogFile log_file { };
+};
+
+namespace ui {
+
+class ACARSAppView : public View {
+public:
+	ACARSAppView(NavigationView& nav);
+	~ACARSAppView();
+
+	void set_parent_rect(const Rect new_parent_rect) override;
+	void focus() override;
+
+	std::string title() const override { return "ACARS RX"; };
+
+private:
+	bool logging { false };
+
+	RFAmpField field_rf_amp {
+		{ 13 * 8, 0 * 16 }
+	};
+	LNAGainField field_lna {
+		{ 15 * 8, 0 * 16 }
+	};
+	VGAGainField field_vga {
+		{ 18 * 8, 0 * 16 }
+	};
+	RSSI rssi {
+		{ 21 * 8, 0, 6 * 8, 4 },
+	};
+	Channel channel {
+		{ 21 * 8, 5, 6 * 8, 4 },
+	};
+	
+	FrequencyField field_frequency {
+		{ 0 * 8, 0 * 8 },
+	};
+	Checkbox check_log {
+		{ 22 * 8, 21 },
+		3,
+		"LOG",
+		true
+	};
+
+	Console console {
+		{ 0, 4 * 16, 240, 240 }
+	};
+
+	std::unique_ptr<ACARSLogger> logger { };
+
+	uint32_t target_frequency_ { };
+	
+	void update_freq(rf::Frequency f);
+
+	void on_packet(const acars::Packet& packet);
+
+	uint32_t target_frequency() const;
+	void set_target_frequency(const uint32_t new_value);
+	
+	MessageHandlerRegistration message_handler_packet {
+		Message::ID::ACARSPacket,
+		[this](Message* const p) {
+			const auto message = static_cast<const ACARSPacketMessage*>(p);
+			const acars::Packet packet { message->packet };
+			this->on_packet(packet);
+		}
+	};
+
+};
+
+} /* namespace ui */
+
+#endif/*__ACARS_APP_H__*/

firmware/application/apps/pocsag_app.cpp

@@ -25,8 +25,6 @@
 #include "baseband_api.hpp"
 #include "portapack_persistent_memory.hpp"
 
-#include "pocsag.hpp"
-
 using namespace portapack;
 using namespace pocsag;
 

firmware/application/apps/ui_freqman.cpp

@@ -112,7 +112,7 @@ void FreqManBaseView::refresh_list() {
 		
 		for (size_t n = 0; n < database.size(); n++) {
 			menu_view.add_item({
-				freqman_item_string(database[n], 26),
+				freqman_item_string(database[n], 30),
 				ui::Color::white(),
 				nullptr,
 				[this](){
@@ -212,7 +212,7 @@ FrequencyLoadView::FrequencyLoadView(
 	});
 	
 	// Resize menu view to fill screen
-	menu_view.set_parent_rect({ 0, 3 * 8, 240, 29 * 8 });
+	menu_view.set_parent_rect({ 0, 3 * 8, 240, 30 * 8 });
 	
 	// Just to allow exit on left
 	menu_view.on_left = [&nav, this]() {

firmware/application/apps/ui_freqman.hpp

@@ -39,8 +39,6 @@ public:
 
 	void focus() override;
 	
-	std::string title() const override { return "Freq. manager"; };
-	
 protected:
 	using option_t = std::pair<std::string, int32_t>;
 	using options_t = std::vector<option_t>;
@@ -89,6 +87,8 @@ class FrequencySaveView : public FreqManBaseView {
 public:
 	FrequencySaveView(NavigationView& nav, const rf::Frequency value);
 
+	std::string title() const override { return "Save frequency"; };
+	
 private:
 	std::string desc_buffer { };
 	rf::Frequency value_ { };
@@ -126,6 +126,8 @@ public:
 	
 	FrequencyLoadView(NavigationView& nav);
 
+	std::string title() const override { return "Load frequency"; };
+	
 private:
 	void refresh_widgets(const bool v);
 };
@@ -135,6 +137,8 @@ public:
 	FrequencyManagerView(NavigationView& nav);
 	~FrequencyManagerView();
 
+	std::string title() const override { return "Freq. manager"; };
+	
 private:
 	std::string desc_buffer { };
 	

firmware/application/main.cpp

@@ -43,12 +43,14 @@
 //GLITCH: Start of tx using ReplayThread plays a small bit of previous transmission (content of 1 buffer ?)
 //	See fifo.reset_in() ?
 
-//TODO: Increase resolution of audio FFT view ? Currently 48k/(256/2) (375Hz) because of the use of real values (half of FFT output)
+//TODO: Add larger description text field in frequency load, under menuview
-//TODO: DCS decoder
+//TODO: Allow apps to select a preferred FREQMAN file
-//TODO: Make CTCSS display only when squelch is opened
 //TODO: Make play button larger in Replay
-//TODO: Put LNA and VGA controls in Soundboard
 //TODO: Add default headphones volume setting in Audio settings
+//TODO: Put LNA and VGA controls in Soundboard
+//TODO: Make CTCSS display only when squelch is opened
+//TODO: DCS decoder
+//TODO: Increase resolution of audio FFT view ? Currently 48k/(256/2) (375Hz) because of the use of real values (half of FFT output)
 //TODO: Move Touchtunes remote to Custom remote
 //TODO: Use escapes \x1B to set colors in text, it works !
 //TODO: Open files in File Manager

firmware/application/ui/ui_menu.cpp

@@ -42,7 +42,7 @@ void MenuItemView::unhighlight() {
 }
 
 void MenuItemView::paint(Painter& painter) {
-	Coord offset_x;
+	Coord offset_x { };
 	
 	if (!item) return;
 	
@@ -71,7 +71,7 @@ void MenuItemView::paint(Painter& painter) {
 		);
 		offset_x = 26;
 	} else
-		offset_x = 8;
+		offset_x = 0;
 
 	Style text_style {
 		.font = paint_style.font,

firmware/application/ui_navigation.cpp

@@ -66,13 +66,14 @@
 #include "ui_view_wav.hpp"
 #include "ui_whipcalc.hpp"
 
-#include "analog_audio_app.hpp"
+#include "acars_app.hpp"
 #include "ais_app.hpp"
-#include "ert_app.hpp"
+#include "analog_audio_app.hpp"
-#include "tpms_app.hpp"
-#include "pocsag_app.hpp"
 #include "capture_app.hpp"
+#include "ert_app.hpp"
+#include "pocsag_app.hpp"
 #include "replay_app.hpp"
+#include "tpms_app.hpp"
 
 #include "core_control.hpp"
 
@@ -330,19 +331,20 @@ void NavigationView::focus() {
 ReceiversMenuView::ReceiversMenuView(NavigationView& nav) {
 	add_items({
 		{ "ADS-B: Planes", 			ui::Color::green(),	&bitmap_icon_adsb,	[&nav](){ nav.replace<ADSBRxView>(); }, },
+		{ "ACARS: Planes", 			ui::Color::yellow(),&bitmap_icon_adsb,	[&nav](){ nav.replace<ACARSAppView>(); }, },
 		{ "AIS:   Boats", 			ui::Color::green(),	&bitmap_icon_ais,	[&nav](){ nav.replace<AISAppView>(); } },
 		{ "AFSK", 					ui::Color::yellow(),&bitmap_icon_receivers,	[&nav](){ nav.replace<AFSKRxView>(); } },
-		{ "APRS", 					ui::Color::grey(),	&bitmap_icon_aprs,	[&nav](){ nav.replace<NotImplementedView>(); } },
 		{ "Audio", 					ui::Color::green(),	&bitmap_icon_speaker,	[&nav](){ nav.replace<AnalogAudioView>(false); } },
-		{ "DMR framing", 			ui::Color::grey(),	&bitmap_icon_dmr,	[&nav](){ nav.replace<NotImplementedView>(); } },
 		{ "ERT:   Utility Meters", 	ui::Color::green(), &bitmap_icon_ert,	[&nav](){ nav.replace<ERTAppView>(); } },
 		{ "POCSAG", 				ui::Color::green(),	&bitmap_icon_pocsag,	[&nav](){ nav.replace<POCSAGAppView>(); } },
+		{ "Radiosondes", 			ui::Color::yellow(),&bitmap_icon_sonde,	[&nav](){ nav.replace<SondeView>(); } },
+		{ "TPMS:  Cars", 			ui::Color::green(),	&bitmap_icon_tpms,	[&nav](){ nav.replace<TPMSAppView>(); } },
+		{ "APRS", 					ui::Color::grey(),	&bitmap_icon_aprs,	[&nav](){ nav.replace<NotImplementedView>(); } },
+		{ "DMR framing", 			ui::Color::grey(),	&bitmap_icon_dmr,	[&nav](){ nav.replace<NotImplementedView>(); } },
 		{ "SIGFOX", 				ui::Color::grey(),	&bitmap_icon_fox,	[&nav](){ nav.replace<NotImplementedView>(); } }, // SIGFRXView
 		{ "LoRa", 					ui::Color::grey(),	&bitmap_icon_lora,	[&nav](){ nav.replace<NotImplementedView>(); } },
-		{ "Radiosondes", 			ui::Color::yellow(),&bitmap_icon_sonde,	[&nav](){ nav.replace<SondeView>(); } },
 		{ "SSTV", 					ui::Color::grey(), 	&bitmap_icon_sstv,	[&nav](){ nav.replace<NotImplementedView>(); } },
 		{ "TETRA framing", 			ui::Color::grey(),	&bitmap_icon_tetra,	[&nav](){ nav.replace<NotImplementedView>(); } },
-		{ "TPMS:  Cars", 			ui::Color::green(),	&bitmap_icon_tpms,	[&nav](){ nav.replace<TPMSAppView>(); } },
 	});
 	on_left = [&nav](){ nav.pop(); };
 	
@@ -356,7 +358,6 @@ TransmittersMenuView::TransmittersMenuView(NavigationView& nav) {
 		{ "ADS-B Mode S", 			ui::Color::yellow(), 	&bitmap_icon_adsb,		[&nav](){ nav.push<ADSBTxView>(); } },
 		{ "APRS", 					ui::Color::orange(),	&bitmap_icon_aprs,		[&nav](){ nav.push<APRSTXView>(); } },
 		{ "BHT Xy/EP", 				ui::Color::green(), 	&bitmap_icon_bht,		[&nav](){ nav.push<BHTView>(); } },
-		{ "Custom remote", 			ui::Color::grey(),		&bitmap_icon_remote,	[&nav](){ nav.push<RemoteView>(); } },
 		{ "Jammer", 				ui::Color::yellow(),	&bitmap_icon_jammer,	[&nav](){ nav.push<JammerView>(); } },
 		{ "Key fob", 				ui::Color::orange(),	&bitmap_icon_keyfob,	[&nav](){ nav.push<KeyfobView>(); } },
 		{ "Microphone", 			ui::Color::green(),		&bitmap_icon_microphone,	[&nav](){ nav.push<MicTXView>(); } },
@@ -369,7 +370,8 @@ TransmittersMenuView::TransmittersMenuView(NavigationView& nav) {
 		{ "Soundboard", 			ui::Color::green(), 	&bitmap_icon_soundboard,	[&nav](){ nav.push<SoundBoardView>(); } },
 		{ "SSTV", 					ui::Color::green(), 	&bitmap_icon_sstv,		[&nav](){ nav.push<SSTVTXView>(); } },
 		{ "TEDI/LCR AFSK", 			ui::Color::yellow(), 	&bitmap_icon_lcr,		[&nav](){ nav.push<LCRView>(); } },
-		{ "TouchTunes remote",		ui::Color::yellow(),	nullptr,				[&nav](){ nav.push<TouchTunesView>(); } },
+		{ "TouchTunes remote",		ui::Color::yellow(),	&bitmap_icon_remote		[&nav](){ nav.push<TouchTunesView>(); } },
+		{ "Custom remote", 			ui::Color::grey(),		&bitmap_icon_remote,	[&nav](){ nav.push<RemoteView>(); } },
 	});
 	on_left = [&nav](){ nav.pop(); };
 }

firmware/baseband/CMakeLists.txt

@@ -277,6 +277,13 @@ macro(DeclareTargets chunk_tag name)
 	set(BASEBAND_IMAGES ${BASEBAND_IMAGES} ${PROJECT_NAME}.img)
 endmacro()
 
+### ACARS RX
+
+set(MODE_CPPSRC
+	proc_acars.cpp
+)
+DeclareTargets(PACA acars)
+
 ### ADS-B RX
 
 set(MODE_CPPSRC

firmware/baseband/proc_acars.cpp

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2018 Furrtek
+ *
+ * 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 "proc_acars.hpp"
+
+#include "portapack_shared_memory.hpp"
+
+#include "dsp_fir_taps.hpp"
+
+#include "event_m4.hpp"
+
+ACARSProcessor::ACARSProcessor() {
+	decim_0.configure(taps_11k0_decim_0.taps, 33554432);
+	decim_1.configure(taps_11k0_decim_1.taps, 131072);
+}
+
+void ACARSProcessor::execute(const buffer_c8_t& buffer) {
+	/* 2.4576MHz, 2048 samples */
+
+	const auto decim_0_out = decim_0.execute(buffer, dst_buffer);
+	const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
+	const auto decimator_out = decim_1_out;
+
+	/* 38.4kHz, 32 samples */
+	feed_channel_stats(decimator_out);
+
+	for(size_t i=0; i<decimator_out.count; i++) {
+		if( mf.execute_once(decimator_out.p[i]) ) {
+			clock_recovery(mf.get_output());
+		}
+	}
+}
+
+void ACARSProcessor::consume_symbol(
+	const float raw_symbol
+) {
+	const uint_fast8_t sliced_symbol = (raw_symbol >= 0.0f) ? 1 : 0;
+	const auto decoded_symbol = nrzi_decode(sliced_symbol);
+
+	packet_builder.execute(decoded_symbol);
+}
+
+void ACARSProcessor::payload_handler(
+	const baseband::Packet& packet
+) {
+	const ACARSPacketMessage message { packet };
+	shared_memory.application_queue.push(message);
+}
+
+int main() {
+	EventDispatcher event_dispatcher { std::make_unique<ACARSProcessor>() };
+	event_dispatcher.run();
+	return 0;
+}

firmware/baseband/proc_acars.hpp

@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2018 Furrtek
+ *
+ * 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.
+ */
+
+#ifndef __PROC_ACARS_H__
+#define __PROC_ACARS_H__
+
+#include "baseband_processor.hpp"
+#include "baseband_thread.hpp"
+#include "rssi_thread.hpp"
+
+#include "dsp_decimate.hpp"
+#include "dsp_demodulate.hpp"
+//#include "audio_compressor.hpp"
+
+#include "spectrum_collector.hpp"
+
+#include <cstdint>
+
+#include "baseband_processor.hpp"
+#include "baseband_thread.hpp"
+#include "rssi_thread.hpp"
+
+#include "channel_decimator.hpp"
+#include "matched_filter.hpp"
+
+#include "clock_recovery.hpp"
+#include "symbol_coding.hpp"
+#include "packet_builder.hpp"
+#include "baseband_packet.hpp"
+
+#include "message.hpp"
+
+#include <cstdint>
+#include <cstddef>
+#include <bitset>
+
+#include "ais_baseband.hpp"
+
+class ACARSProcessor : public BasebandProcessor {
+public:
+	ACARSProcessor();
+
+	void execute(const buffer_c8_t& buffer) override;
+
+private:
+	static constexpr size_t baseband_fs = 2457600;
+
+	BasebandThread baseband_thread { baseband_fs, this, NORMALPRIO + 20, baseband::Direction::Receive };
+	RSSIThread rssi_thread { NORMALPRIO + 10 };
+
+	std::array<complex16_t, 512> dst { };
+	const buffer_c16_t dst_buffer {
+		dst.data(),
+		dst.size()
+	};
+
+	dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0 { };
+	dsp::decimate::FIRC16xR16x32Decim8 decim_1 { };
+	dsp::matched_filter::MatchedFilter mf { baseband::ais::square_taps_38k4_1t_p, 2 };
+
+	clock_recovery::ClockRecovery<clock_recovery::FixedErrorFilter> clock_recovery {
+		19200, 2400, { 0.0555f },
+		[this](const float symbol) { this->consume_symbol(symbol); }
+	};
+	symbol_coding::NRZIDecoder nrzi_decode { };
+	PacketBuilder<BitPattern, NeverMatch, BitPattern> packet_builder {
+		{ 0b1001011010010110, 16, 1 },	// SYN, SYN
+		{ },
+		{ 0b11111111, 8, 1 },
+		[this](const baseband::Packet& packet) {
+			this->payload_handler(packet);
+		}
+	};
+
+	void consume_symbol(const float symbol);
+	void payload_handler(const baseband::Packet& packet);
+};
+
+#endif/*__PROC_ACARS_H__*/

firmware/common/acars_packet.cpp

@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2018 Furrtek
+ *
+ * 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 "acars_packet.hpp"
+
+#include "crc.hpp"
+
+#include <cstdlib>
+
+namespace acars {
+
+size_t Packet::length() const {
+	return packet_.size();
+}
+
+bool Packet::is_valid() const {
+	return length_valid() && crc_ok();
+}
+
+Timestamp Packet::received_at() const {
+	return packet_.timestamp();
+}
+
+uint8_t Packet::block_id() const {
+	return field_.read(96, 8);
+}
+
+std::string Packet::registration_number() const {
+	std::string result;
+	result.reserve(7);
+	
+	const size_t character_length = 8;
+	for(size_t i=16; i<(16+7*character_length); i+=character_length) {
+		result += (field_.read(i, character_length) & 0x7F);
+	} 
+
+	return result;
+}
+
+uint32_t Packet::read(const size_t start_bit, const size_t length) const {
+	return field_.read(start_bit, length);
+}
+
+/*std::string Packet::text(
+	const size_t start_bit,
+	const size_t character_count
+) const {
+	std::string result;
+	result.reserve(character_count);
+	
+	const size_t character_length = 6;
+	const size_t end_bit = start_bit + character_count * character_length;
+	for(size_t i=start_bit; i<end_bit; i+=character_length) {
+		result += char_to_ascii(field_.read(i, character_length));
+	} 
+
+	return result;
+}*/
+
+bool Packet::crc_ok() const {
+	CRCReader field_crc { packet_ };
+	CRC<16> acars_fcs { 0x1021, 0x0000, 0x0000 };
+	
+	for(size_t i=0; i<data_length(); i+=8) {
+		acars_fcs.process_byte(field_crc.read(i, 8));
+	}
+
+	return (acars_fcs.checksum() == field_crc.read(data_length(), fcs_length));
+}
+
+size_t Packet::data_and_fcs_length() const {
+	return length() - 8;
+}
+
+size_t Packet::data_length() const {
+	return data_and_fcs_length() - fcs_length;
+}
+
+bool Packet::length_valid() const {
+	const size_t extra_bits = data_and_fcs_length() & 7;
+	if( extra_bits != 0 ) {
+		return false;
+	}
+
+	return true;
+}
+
+} /* namespace ais */

firmware/common/acars_packet.hpp

@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2018 Furrtek
+ *
+ * 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.
+ */
+
+#ifndef __ACARS_PACKET_H__
+#define __ACARS_PACKET_H__
+
+#include "baseband_packet.hpp"
+#include "field_reader.hpp"
+
+#include <cstdint>
+#include <cstddef>
+#include <string>
+
+namespace acars {
+
+class Packet {
+public:
+	constexpr Packet(
+		const baseband::Packet& packet
+	) : packet_ { packet },
+		field_ { packet_ }
+	{
+	}
+
+	size_t length() const;
+	
+	bool is_valid() const;
+
+	Timestamp received_at() const;
+
+	uint8_t block_id() const;
+	std::string registration_number() const;
+
+	uint32_t read(const size_t start_bit, const size_t length) const;
+	//std::string text(const size_t start_bit, const size_t character_count) const;
+
+	bool crc_ok() const;
+
+private:
+	using Reader = FieldReader<baseband::Packet, BitRemapByteReverse>;
+	using CRCReader = FieldReader<baseband::Packet, BitRemapNone>;
+	
+	const baseband::Packet packet_;
+	const Reader field_;
+
+	const size_t fcs_length = 16;
+
+	size_t data_and_fcs_length() const;
+	size_t data_length() const;
+
+	bool length_valid() const;
+};
+
+} /* namespace acars */
+
+#endif/*__ACARS_PACKET_H__*/

firmware/common/message.hpp

@@ -30,13 +30,14 @@
 #include <functional>
 #include <algorithm>
 
-#include "pocsag_packet.hpp"
 #include "baseband_packet.hpp"
+
+#include "acars_packet.hpp"
+#include "adsb_frame.hpp"
 #include "ert_packet.hpp"
-#include "tpms_packet.hpp"
 #include "pocsag_packet.hpp"
 #include "sonde_packet.hpp"
-#include "adsb_frame.hpp"
+#include "tpms_packet.hpp"
 #include "jammer.hpp"
 #include "dsp_fir_taps.hpp"
 #include "dsp_iir.hpp"
@@ -57,9 +58,10 @@ public:
 		ChannelStatistics = 2,
 		DisplayFrameSync = 3,
 		AudioStatistics = 4,
+		Shutdown = 5,
 		TPMSPacket = 6,
-		Shutdown = 8,
+		ACARSPacket = 7,
-		AISPacket = 7,
+		AISPacket = 8,
 		ERTPacket = 9,
 		SondePacket = 10,
 		UpdateSpectrum = 11,
@@ -357,6 +359,18 @@ public:
 	pocsag::POCSAGPacket packet;
 };
 
+class ACARSPacketMessage : public Message {
+public:
+	constexpr ACARSPacketMessage(
+		const baseband::Packet& packet
+	) : Message { ID::ACARSPacket },
+		packet { packet }
+	{
+	}
+
+	baseband::Packet packet;
+};
+
 class ADSBFrameMessage : public Message {
 public:
 	constexpr ADSBFrameMessage(

firmware/common/spi_image.hpp

@@ -63,6 +63,7 @@ private:
 	char c[4];
 };
 
+constexpr image_tag_t image_tag_acars				{ 'P', 'A', 'C', 'A' };
 constexpr image_tag_t image_tag_adsb_rx				{ 'P', 'A', 'D', 'R' };
 constexpr image_tag_t image_tag_afsk_rx				{ 'P', 'A', 'F', 'R' };
 constexpr image_tag_t image_tag_ais					{ 'P', 'A', 'I', 'S' };

sdcard/FREQMAN/ACARS.TXT

@@ -0,0 +1,17 @@
+f=131550000,d=World Primary
+f=130425000,d=USA Additional
+f=131125000,d=USA Additional
+f=136700000,d=USA Additional
+f=136750000,d=USA Additional
+f=136800000,d=USA Additional
+f=130025000,d=USA/CAN Secondary
+f=129125000,d=USA/CAN Additional
+f=130450000,d=USA/CAN Additional
+f=131725000,d=Euro Primary
+f=131525000,d=Euro Secondary
+f=136900000,d=Euro Secondary
+f=131850000,d=New European
+f=136750000,d=New European
+f=131450000,d=Japan Primary
+f=136850000,d=SITA North America
+f=131475000,d=Air Canada