Move baseband_sgpio.* to common/.

It'll soon be used by M4 code, not M0. SGPIO baseband streaming needs to be tightly controlled by... the baseband!

firmware/common/baseband_sgpio.hpp

@@ -0,0 +1,67 @@
+/*
+ * 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 __BASEBAND_GPIO_H__
+#define __BASEBAND_GPIO_H__
+
+#include <cstdint>
+
+#include "baseband.hpp"
+
+#include "hal.h"
+
+namespace baseband {
+
+class SGPIO {
+public:
+	void init() {
+	}
+
+	void configure(const Direction direction);
+
+	void streaming_enable() {
+		/* TODO: Any reason not to control from general GPIO facility? */
+		LPC_SGPIO->GPIO_OUTREG &= ~(1U << 10);
+	}
+
+	void streaming_disable() {
+		/* TODO: Any reason not to control from general GPIO facility? */
+		LPC_SGPIO->GPIO_OUTREG |= (1U << 10);
+	}
+
+	bool streaming_is_enabled() const {
+		/* TODO: Any reason not to control from general GPIO facility? */
+		return (LPC_SGPIO->GPIO_OUTREG >> 10) & 1;
+	}
+
+private:
+	void disable_all_slice_counters() {
+		set_slice_counter_enables(0);
+	}
+
+	void set_slice_counter_enables(const uint16_t enable_mask) {
+		LPC_SGPIO->CTRL_ENABLE = enable_mask;
+	}
+};
+
+}
+
+#endif/*__BASEBAND_GPIO_H__*/