Added De Bruijn sequence generator

Moved POCSAG frequency list to SD card file for FreqMan

firmware/application/de_bruijn.hpp

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2017 Furrtek
+ *
+ * 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 <string>
+
+#ifndef __DE_BRUIJN_H__
+#define __DE_BRUIJN_H__
+
+// Starts at n = 3
+const uint32_t de_bruijn_polys[14] {
+	0b0000000000000101,
+	0b0000000000001001,
+	0b0000000000011011,
+	0b0000000000110011,
+	0b0000000001010011,
+	0b0000000010001101,
+	0b0000000100100001,
+	0b0000001000100001,
+	0b0000010001100001,
+	0b0000110101000011,
+	0b0001001001100101,
+	0b0010101100000011,
+	0b0101000000001001,
+	0b1010000101000101
+};
+
+struct de_bruijn {
+public:
+	void init(const uint32_t n);
+	uint32_t compute(const uint32_t step);
+
+private:
+	uint32_t length { };
+	uint32_t poly { };
+	uint32_t shift_register { };
+};
+
+#endif/*__DE_BRUIJN_H__*/