Started working on radiosonde RX

Removed some warnings
Better handling of absent map file in GeoMap ?

firmware/common/sonde_packet.cpp

@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2017 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 "sonde_packet.hpp"
+
+//#include "crc.hpp"
+
+namespace sonde {
+
+size_t Packet::length() const {
+	return decoder_.symbols_count();
+}
+
+bool Packet::is_valid() const {
+	return true;
+}
+
+Timestamp Packet::received_at() const {
+	return packet_.timestamp();
+}
+
+Packet::Type Packet::type() const {
+	return type_;
+}
+
+SN Packet::serial_number() const {
+	if (type() == Type::M10) {
+		// See https://github.com/rs1729/RS/blob/master/m10/m10x.c line 606
+		return (reader_.read(2 * 8, 8) << 20) |
+			(reader_.read(0, 4) << 16) |
+			(reader_.read(4 * 8, 3) << 13) |
+			(reader_.read(4 * 8 + 3, 5) << 8) |
+			reader_.read(3 * 8, 8);
+	}
+	return 0;
+}
+
+FormattedSymbols Packet::symbols_formatted() const {
+	return format_symbols(decoder_);
+}
+
+bool Packet::crc_ok() const {
+	switch(type()) {
+	case Type::M10:	return crc_ok_M10();
+	default:		return false;
+	}
+}
+
+bool Packet::crc_ok_M10() const {
+    uint16_t cs { 0 };
+	uint32_t c0, c1, t, t6, t7, s,b ;
+    
+	for (size_t i = 0; i < packet_.size(); i++) {
+		b = packet_[i];
+		c1 = cs & 0xFF;
+
+		// B
+		b = (b >> 1) | ((b & 1) << 7);
+		b ^= (b >> 2) & 0xFF;
+
+		// A1
+		t6 = (cs & 1) ^ ((cs >> 2) & 1) ^ ((cs >> 4) & 1);
+		t7 = ((cs >> 1) & 1) ^ ((cs >> 3) & 1) ^ ((cs >> 5) & 1);
+		t = (cs & 0x3F) | (t6 << 6) | (t7 << 7);
+
+		// A2
+		s = (cs >> 7) & 0xFF;
+		s ^= (s >> 2) & 0xFF;
+
+		c0 = b ^ t ^ s;
+
+		cs = ((c1<<8) | c0) & 0xFFFF;
+    }
+
+	return ((cs & 0xFFFF) == ((packet_[0x63] << 8) | (packet_[0x63 + 1])));
+}
+
+} /* namespace sonde */