Initial firmware commit.

firmware/common/jtag.cpp

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#include "jtag.hpp"
+
+#include <cstdint>
+#include <cstddef>
+
+namespace jtag {
+
+uint32_t JTAG::shift(const size_t count, uint32_t value) {
+	for(size_t i=0; i<count; i++) {
+		const auto tdo = target.clock(
+			(i == (count - 1)) ? 1 : 0,
+			value & 1
+		);
+		value >>= 1;
+		value |= tdo << (count - 1);
+	}
+	return value;
+}
+
+} /* namespace jtag */