Initial firmware commit.

firmware/baseband/packet_builder.hpp

@@ -0,0 +1,75 @@
+/*
+ * 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.
+ */
+
+#ifndef __PACKET_BUILDER_H__
+#define __PACKET_BUILDER_H__
+
+#include <cstdint>
+#include <cstddef>
+#include <bitset>
+
+class PacketBuilder {
+public:
+	void configure(size_t new_payload_length);
+
+	template<typename PayloadHandler>
+	void execute(
+		const uint_fast8_t symbol,
+		const bool access_code_found,
+		PayloadHandler payload_handler
+	) {
+		switch(state) {
+		case State::AccessCodeSearch:
+			if( access_code_found ) {
+				state = State::Payload;
+			}
+			break;
+
+		case State::Payload:
+			if( bits_received < payload_length ) {
+				payload[bits_received++] = symbol;
+			} else {
+				payload_handler(payload, bits_received);
+				reset_state();
+			}
+			break;
+
+		default:
+			reset_state();
+			break;
+		}
+	}
+
+private:
+	enum State {
+		AccessCodeSearch,
+		Payload,
+	};
+
+	size_t payload_length { 0 };
+	size_t bits_received { 0 };
+	State state { State::AccessCodeSearch };
+	std::bitset<256> payload;
+
+	void reset_state();
+};
+
+#endif/*__PACKET_BUILDER_H__*/