Extract BufferExchange, simplify threading.

firmware/common/buffer_exchange.hpp

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+/*
+ * Copyright (C) 2016 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.
+ */
+
+#pragma once
+
+#include "ch.h"
+
+#include "message.hpp"
+#include "fifo.hpp"
+#include "io.hpp"
+
+class BufferExchange {
+public:
+	BufferExchange(CaptureConfig* const config);
+	~BufferExchange();
+
+#if defined(LPC43XX_M0)
+	bool empty() const {
+		return fifo_buffers_for_application->is_empty();
+	}
+
+	StreamBuffer* get() {
+		return get(fifo_buffers_for_application);
+	}
+
+	bool put(StreamBuffer* const p) {
+		return fifo_buffers_for_baseband->in(p);
+	}
+#endif
+
+#if defined(LPC43XX_M4)
+	bool empty() const {
+		return fifo_buffers_for_baseband->is_empty();
+	}
+
+	StreamBuffer* get() {
+		return get(fifo_buffers_for_baseband);
+	}
+
+	bool put(StreamBuffer* const p) {
+		return fifo_buffers_for_application->in(p);
+	}
+#endif
+
+	static void handle_isr() {
+		if( obj ) {
+			obj->check_fifo_isr();
+		}
+	}
+
+private:
+	CaptureConfig* const config;
+	FIFO<StreamBuffer*>* fifo_buffers_for_baseband;
+	FIFO<StreamBuffer*>* fifo_buffers_for_application;
+	Thread* thread;
+	static BufferExchange* obj;
+
+	void check_fifo_isr() {
+		if( !empty() ) {
+			wakeup_isr();
+		}
+	}
+
+	void wakeup_isr() {
+		auto thread_tmp = thread;
+		if( thread_tmp ) {
+			thread = nullptr;
+			chSchReadyI(thread_tmp);
+		}
+	}
+
+	StreamBuffer* get(FIFO<StreamBuffer*>* fifo);
+};