crc8 Library - Original copyright: Colin O'Flynn - Copyright (c) 2002

Dependents:   mlx90615_lpc1768

Files at this revision

API Documentation at this revision

Comitter:
evwijk
Date:
Thu Oct 21 17:11:49 2010 +0000
Commit message:

Changed in this revision

crc8.cpp Show annotated file Show diff for this revision Revisions of this file
crc8.h Show annotated file Show diff for this revision Revisions of this file
diff -r 000000000000 -r cc65a6cec1a1 crc8.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crc8.cpp	Thu Oct 21 17:11:49 2010 +0000
@@ -0,0 +1,64 @@
+/* please read copyright-notice at EOF */
+
+#include "crc8.h"
+
+#define CRC8INIT    0x00
+#define CRC8POLY    0x18              //0X18 = X^8+X^5+X^4+X^0
+
+char    crc8 ( char *data_in, int number_of_bytes_to_read )
+{
+    char     crc;
+    int loop_count;
+    char  bit_counter;
+    char  data;
+    char  feedback_bit;
+    
+    crc = CRC8INIT;
+
+    for (loop_count = 0; loop_count != number_of_bytes_to_read; loop_count++)
+    {
+        data = data_in[loop_count];
+        
+        bit_counter = 8;
+        do {
+            feedback_bit = (crc ^ data) & 0x01;
+    
+            if ( feedback_bit == 0x01 ) {
+                crc = crc ^ CRC8POLY;
+            }
+            crc = (crc >> 1) & 0x7F;
+            if ( feedback_bit == 0x01 ) {
+                crc = crc | 0x80;
+            }
+        
+            data = data >> 1;
+            bit_counter--;
+        
+        } while (bit_counter > 0);
+    }
+    
+    return crc;
+}
+
+/*
+This code is from Colin O'Flynn - Copyright (c) 2002 
+only minor changes by M.Thomas 9/2004
+oonverted to mbed library by Erik van Wijk 10/2010
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
diff -r 000000000000 -r cc65a6cec1a1 crc8.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crc8.h	Thu Oct 21 17:11:49 2010 +0000
@@ -0,0 +1,29 @@
+#ifndef CRC8_H_
+#define CRC8_H_
+
+char	crc8 (char* data_in, int number_of_bytes_to_read);
+
+#endif
+
+/*
+This is based on code from :
+
+Copyright (c) 2002 Colin O'Flynn
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/