Added basic POCSAG receiver

Added Yes/no modal screen (for future tx warnings)

firmware/common/pocsag_packet.hpp

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2016 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 __POCSAG_PACKET_H__
+#define __POCSAG_PACKET_H__
+
+#include <cstdint>
+#include <cstddef>
+
+#include "optional.hpp"
+
+#include "baseband.hpp"
+
+namespace pocsag {
+
+enum SignalRate : uint32_t {
+	FSK512 = 1,
+	FSK1200 = 2,
+	FSK2400 = 3,
+	DEBUG = 4
+};
+
+class POCSAGPacket {
+public:
+	void set_timestamp(const Timestamp& value) {
+		timestamp_ = value;
+	}
+	
+	Timestamp timestamp() const {
+		return timestamp_;
+	}
+
+	void set(const size_t index, const uint32_t data) {
+		if (index < 16)
+			codewords[index] = data;
+	}
+
+	uint32_t operator[](const size_t index) const {
+		return (index < 16) ? codewords[index] : 0;
+	}
+	
+	SignalRate signal_rate() const {
+		return FSK1200;
+	}
+
+	void clear() {
+		for (size_t c = 0; c < 16; c++)
+			codewords[c] = 0;
+	}
+
+private:
+	//SignalRate rate = FSK1200;
+	uint32_t codewords[16];
+	Timestamp timestamp_ { };
+};
+
+} /* namespace pocsag */
+
+#endif/*__POCSAG_PACKET_H__*/