crc.h

ST7540 Demo 下位机C程序

//*********************************************************************************
//*               ST 7538 DEMOBOARD SOFTWARE 	  CRC.h                             *
//*                                                                               *
//*               CRC functions                        V1.2                       *
//*********************************************************************************

/**********************************************************************************
* Description:
* This function generates the 16 bit CRC	 16  15  2
* using the following polynom: 				X + X + X + 1
**********************************************************************************/
extern unsigned int dll_CalcCRC(unsigned char *buf, unsigned char n);

/**********************************************************************************
* This function generates the 8 bit CRC  6   5   4   3
* using the following polynom: 			X + X + X + X + 1
**********************************************************************************/
unsigned char CRC( unsigned char char_in,unsigned char crc_in, char num);

/*********************************************************************************
* Correction table. The table is used char Check_frame(void) for correction message
* which has wrong FCS.   
**********************************************************************************/
extern const unsigned int CorectTab[256];