Started work on ACARS RX

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

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,
-		AISPacket = 7,
+		ACARSPacket = 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' };