X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Falgo%2Fcrc.h;h=9696e4f1606679d5ab53f8ad304edba209c4d72a;hb=2a398044dd1d7b2af34a96c19ad378c25b546579;hp=81a0c9265a2b6bb7996618a3566c5cde34ab3465;hpb=46fb189becafd5e812ce9a58eb4c25b586b17771;p=bertos.git

diff --git a/bertos/algo/crc.h b/bertos/algo/crc.h
index 81a0c926..9696e4f1 100644
--- a/bertos/algo/crc.h
+++ b/bertos/algo/crc.h
@@ -31,7 +31,7 @@
  *
  * -->
  *
- * \brief Cyclic Redundancy Check 16 (CRC).
+ * \brief Cyclic Redundancy Check 16 (CRC). This algorithm is the one used by the XMODEM protocol.
  *
  * \note This algorithm is incompatible with the CCITT-CRC16.
  *
@@ -55,14 +55,10 @@
 #include <cfg/compiler.h>
 #include <cpu/pgm.h>
 
-
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
+EXTERN_C_BEGIN
 
 /* CRC table */
-const uint16_t crc16tab[256];
+extern const uint16_t crc16tab[256];
 
 
 /**
@@ -74,12 +70,14 @@ const uint16_t crc16tab[256];
  * \param c New octet (range 0-255)
  * \param oldcrc Previous CRC16 value (referenced twice, beware of side effects)
  */
-#if CPU_AVR
+#if CPU_HARVARD
 	#define UPDCRC16(c, oldcrc) (pgm_read_uint16_t(&crc16tab[((oldcrc) >> 8) ^ ((unsigned char)(c))]) ^ ((oldcrc) << 8))
 #else
 	#define UPDCRC16(c, oldcrc) ((crc16tab[((oldcrc) >> 8) ^ ((unsigned char)(c))]) ^ ((oldcrc) << 8))
 #endif
 
+/** CRC-16 init value */
+#define CRC16_INIT_VAL ((uint16_t)0)
 
 #ifdef INLINE
 /**
@@ -87,7 +85,7 @@ const uint16_t crc16tab[256];
  */
 INLINE uint16_t updcrc16(uint8_t c, uint16_t oldcrc)
 {
-#if CPU_AVR
+#if CPU_HARVARD
 	return pgm_read_uint16_t(&crc16tab[(oldcrc >> 8) ^ c]) ^ (oldcrc << 8);
 #else
 	return crc16tab[(oldcrc >> 8) ^ c] ^ (oldcrc << 8);
@@ -107,8 +105,10 @@ INLINE uint16_t updcrc16(uint8_t c, uint16_t oldcrc)
  */
 extern uint16_t crc16(uint16_t crc, const void *buf, size_t len);
 
-#ifdef __cplusplus
-}
-#endif /* __cplusplus */
+int crc_testSetup(void);
+int crc_testRun(void);
+int crc_testTearDown(void);
+
+EXTERN_C_END
 
 #endif /* ALGO_CRC_H */