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00001 /* This file has been prepared for Doxygen automatic documentation generation.*/ 00050 /*============================ INCLUDE =======================================*/ 00051 #if defined( __ICCAVR__ ) || defined( DOXYGEN ) 00052 00053 #include <stdint.h> 00054 #include <stdbool.h> 00055 00056 #include "compiler.h" 00057 00058 /*============================ MACROS ========================================*/ 00059 /*============================ TYPDEFS =======================================*/ 00060 /*============================ PROTOTYPES ====================================*/ 00061 /*============================ IMPLEMENTATION ================================*/ 00062 00063 /* Only needed for the IAR as avr-libc has an inlined implementation. */ 00064 00074 uint16_t crc_ccitt_update( uint16_t crc, uint8_t data ) 00075 { 00076 data ^= crc & 0xFF; 00077 data ^= data << 4; 00078 00079 uint16_t ret_val = ((((uint16_t)data << 8) | ((crc & 0xFF00) >> 8)) 00080 ^ (uint8_t)(data >> 4) 00081 ^ ((uint16_t)data << 3)); 00082 return ret_val; 00083 } 00084 00085 #endif /* __ICCAVR__ || defined(DOXYGEN) */ 00086 /* EOF */
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