Initial commit

2025-12-22 08:05:49 +08:00 · 2016-01-14 18:45:04 +00:00
commit d34d85c04b
98 changed files with 12038 additions and 0 deletions
--- a/CRC.cpp
+++ b/CRC.cpp
@@ -0,0 +1,114 @@
+/*
+ *   Copyright (C) 2015 by Jonathan Naylor G4KLX
+ *
+ *   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 of the License, 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; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "CRC.h"
+
+#include "Utils.h"
+
+#include <cstdio>
+#include <cassert>
+#include <cmath>
+
+bool CCRC::checkFiveBit(bool* in, unsigned int tcrc)
+{
+	assert(in != NULL);
+
+	unsigned int crc;
+	encodeFiveBit(in, crc);
+
+	return crc == tcrc;
+}
+
+void CCRC::encodeFiveBit(const bool* in, unsigned int& tcrc)
+{
+	assert(in != NULL);
+
+	unsigned short total = 0U;
+	for (unsigned int i = 0U; i < 72U; i += 8U) {
+		unsigned char c;
+		CUtils::bitsToByteBE(in + i, c);
+		total += c;
+	}
+
+	total %= 31U;
+
+	tcrc = total;
+}
+
+unsigned char CCRC::encodeEightBit(const unsigned char *in, unsigned int length)
+{
+	assert(in != NULL);
+
+	unsigned char crc = 0x00U;
+
+	for (unsigned int i = 0U; i < length; i++) {
+		crc ^= in[i];
+	
+		for (unsigned int j = 0U; j < 8U; j++) {
+			if ((crc & 0x80U) == 0x80U) {
+				crc <<= 1;
+				crc ^= 0x07U;
+			} else {
+				crc <<= 1;
+			}
+		}
+	}
+
+	return crc;
+}
+
+bool CCRC::checkCSBK(const unsigned char *in)
+{
+	unsigned short crc16 = 0U;
+
+	// Run through all 12 bits
+	for (unsigned int a = 0; a < 12U; a++)	{
+		unsigned char val = in[a];
+
+		// Allow for the CSBK CRC mask
+		if (a > 9U)
+			val ^= 0xA5U;
+
+		for (unsigned int i = 0U; i < 8U; i++) {
+			bool c15 = (crc16 >> 15 & 0x01U) == 0x01U;
+			bool bit = (val >> (7 - i) & 0x01U) == 0x01U;
+			crc16 <<= 1;
+			if (c15 ^ bit)
+				crc16 ^= 0x1021U;
+		}
+	}
+
+	return crc16 == 0x1D0FU;
+}
+
+unsigned char CCRC::crc8(const unsigned char *in, unsigned int length)
+{
+	unsigned int crc = 0U;
+
+	for (unsigned int j = 0U; j < length; j++, in++) {
+		crc ^= (*in << 8);
+
+		for (unsigned int i = 0U; i < 8U; i++) {
+			if (crc & 0x8000U)
+				crc ^= (0x1070U << 3);
+			crc <<= 1;
+		}
+	}
+
+	return crc >> 8;
+}