Revision 0:70b7787124e0, committed 2016-07-12

Comitter:

rba90

Date:

Tue Jul 12 13:10:24 2016 +0000

Commit message:

init;

Changed in this revision

diff -r 000000000000 -r 70b7787124e0 crc.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crc.cpp	Tue Jul 12 13:10:24 2016 +0000
@@ -0,0 +1,21 @@
+#include "crc.h"
+
+uint8_t crc8(const uint8_t *data, int len)
+{
+    unsigned int crc = 0;
+
+    for (int j = len; j; j--, data++)
+    {
+        crc ^= (*data << 8);
+        for (int i = 8; i; i--)
+        {
+            if (crc & 0x8000)
+            {
+                crc ^= (CRC8_GEN << 3);
+            }
+            crc <<= 1;
+        }
+    }
+
+    return (uint8_t)(crc >> 8);
+}
\ No newline at end of file

diff -r 000000000000 -r 70b7787124e0 crc.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crc.h	Tue Jul 12 13:10:24 2016 +0000
@@ -0,0 +1,11 @@
+#ifndef crc_h_
+#define crc_h_
+
+#include <stdint.h>
+
+// x^8 + x^2 + x + 1 polynomial
+#define CRC8_GEN 0x1070 
+
+uint8_t crc8(const uint8_t *data, int len);
+
+#endif
\ No newline at end of file