Initial firmware commit.

firmware/application/spi_arbiter.hpp

@@ -0,0 +1,77 @@
+/*
+ * 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 __SPI_ARBITER_H__
+#define __SPI_ARBITER_H__
+
+#include <cstddef>
+
+#include "spi_pp.hpp"
+
+namespace spi {
+namespace arbiter {
+
+class Arbiter {
+public:
+	constexpr Arbiter(
+		SPI& bus
+	) : _bus(bus),
+		_config(nullptr)
+	{
+	}
+
+	void transfer(const SPIConfig* const config, void* const data, const size_t count) {
+		if( config != _config ) {
+			_bus.stop();
+			_bus.start(*config);
+			_config = config;
+		}
+		_bus.transfer(data, count);
+	}
+
+private:
+	SPI& _bus;
+	const SPIConfig* _config;
+};
+
+class Target {
+public:
+	constexpr Target(
+		Arbiter& arbiter,
+		const SPIConfig& config
+	) : _arbiter(arbiter),
+		_config(config)
+	{
+	}
+
+	void transfer(void* const data, const size_t count) {
+		_arbiter.transfer(&_config, data, count);
+	}
+
+private:
+	Arbiter& _arbiter;
+	const SPIConfig _config;
+};
+
+} /* arbiter */
+} /* spi */
+
+#endif/*__SPI_ARBITER_H__*/