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  1. #include <stdio.h>
  2.  
  3. short gencrc_16(short i);
  4. void send_cmd(unsigned char *cmd, unsigned short len);
  5. unsigned short CalculateCharacterCRC16( unsigned short crc, unsigned char c );
  6. unsigned char cmd[4] = {0x52,0xE0,0xEF};
  7. unsigned char bit[2];
  8. void send_cmd(unsigned char *cmd, unsigned short len)
  9. {
  10. 	unsigned short i;
  11. 	unsigned short crc = 0;
  12. 	crc = CalculateCharacterCRC16(0,0x02);
  13. 	for (i=0; i<len; i++)
  14. 	{
  15. 		//send_byte(*cmd);
  16. 		crc = CalculateCharacterCRC16(crc,*cmd++);
  17. 		bit[0] = (crc>>8);
  18. 		bit[1] = crc;
  19.  
  20. 	}
  21. 	printf("first[%x]..sec[%x]",bit[0],bit[1]);
  22. }
  23. short gencrc_16(short i)
  24. {
  25. 	short j;
  26. 	short k;
  27. 	short crc;
  28. 	k = i << 8;
  29. 	crc = 0;
  30. 	for ( j = 0 ; j < 8 ; j++ ) 
  31. 	{
  32. 		if ( ( crc ^ k ) & 0x8000 )
  33. 		crc = ( crc << 1 ) ^ 0x1021;
  34. 	 else
  35. 		crc <<= 1;
  36. 		k <<= 1;
  37. 	}
  38. 	return(crc);
  39. }
  40. unsigned short CalculateCharacterCRC16( unsigned short crc, unsigned char c )
  41. {
  42. return( ( crc << 8 ) ^ gencrc_16( (crc >> 8 ) ^ c ) );
  43. }
  44. int main(void) {
  45. send_cmd(cmd,3);
  46. 	return 0;
  47. }
  48.  
Success #stdin #stdout 0s 9432KB
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first[c1]..sec[b5]
https://ideone.com/W5BGn6
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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