Diff: RHCRC.cpp

Revision:

0:ab4e012489ef

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/RHCRC.cpp	Thu Oct 15 01:27:00 2015 +0000
@@ -0,0 +1,104 @@
+/* Copyright (c) 2002, 2003, 2004  Marek Michalkiewicz
+   Copyright (c) 2005, 2007 Joerg Wunsch
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions are met:
+
+   * Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+
+   * Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in
+     the documentation and/or other materials provided with the
+     distribution.
+
+   * Neither the name of the copyright holders nor the names of
+     contributors may be used to endorse or promote products derived
+     from this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+  POSSIBILITY OF SUCH DAMAGE. */
+
+//	Port to Energia / MPS430 by Yannick DEVOS XV4Y - (c) 2013
+//	http://xv4y.radioclub.asia/
+//	
+
+// Adapted to RadioHead use by Mike McCauley 2014
+// This is to prevent name collisions with other similar library functions
+// and to provide a consistent API amonng all processors
+//
+
+/* $Id: RHCRC.cpp,v 1.1 2014/06/24 02:40:12 mikem Exp $ */
+
+#include <RHCRC.h>
+
+#define lo8(x) ((x)&0xff) 
+#define hi8(x) ((x)>>8)
+
+uint16_t RHcrc16_update(uint16_t crc, uint8_t a)
+{
+    int i;
+
+    crc ^= a;
+    for (i = 0; i < 8; ++i)
+    {
+	if (crc & 1)
+	    crc = (crc >> 1) ^ 0xA001;
+	else
+	    crc = (crc >> 1);
+    }
+    return crc;
+}
+
+uint16_t RHcrc_xmodem_update (uint16_t crc, uint8_t data)
+{
+    int i;
+    
+    crc = crc ^ ((uint16_t)data << 8);
+    for (i=0; i<8; i++)
+    {
+	if (crc & 0x8000)
+	    crc = (crc << 1) ^ 0x1021;
+	else
+	    crc <<= 1;
+    }
+    
+    return crc;
+}
+
+uint16_t RHcrc_ccitt_update (uint16_t crc, uint8_t data)
+{
+    data ^= lo8 (crc);
+    data ^= data << 4;
+    
+    return ((((uint16_t)data << 8) | hi8 (crc)) ^ (uint8_t)(data >> 4) 
+	    ^ ((uint16_t)data << 3));
+}
+
+uint8_t RHcrc_ibutton_update(uint8_t crc, uint8_t data)
+{
+    uint8_t i;
+    
+    crc = crc ^ data;
+    for (i = 0; i < 8; i++)
+    {
+	if (crc & 0x01)
+	    crc = (crc >> 1) ^ 0x8C;
+	else
+	    crc >>= 1;
+    }
+    
+    return crc;
+}
+
+