Zoltan Hudak / CRC16_CCITT

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Diff: CRC16_CCITT.h

Revision:
1:6ecc3a64bf7b
Parent:
0:253105d48c3c
--- a/CRC16_CCITT.h	Sat Sep 02 08:26:22 2017 +0000
+++ b/CRC16_CCITT.h	Sun Sep 03 08:29:38 2017 +0000
@@ -4,7 +4,7 @@
  *
  * Modified by Zoltan Hudak to implement CRC16-CCITT
  * using the polynomial 0x1021: X^16 + X^15 + X^2 + 1.
- * Initial CRC register = 0x0000
+ * Default initial CRC value = 0x0000
  */
 
 #ifndef CRC16_CCITT_H
@@ -16,8 +16,9 @@
     static const unsigned int   SHIFTER;
     static const unsigned short TABLE[];
 public:
-    CRC16_CCITT(void) { };
-    ~CRC16_CCITT(void){ };
-    unsigned short  calc(char input[], int length);
+    CRC16_CCITT(void){};
+    ~CRC16_CCITT(void){};
+    unsigned short calc(char input[], int length, unsigned short crc = 0x0000);
 };
+
 #endif // CRC16_CCITT_H