User's Manual

i-PORT MB – Manual
Version 1.1 02.02.2007 Page 36/ 37
6.0 APPENDIX
7.1 Sample CRC calculation
The following sample code is provided ‘as is’. IDENTEC SOLUTIONS does not guarantee compatibility with any
interface or protocol except this used in the standard version of the i-PORT R2.
//! crc table for host communication
unsigned char code crc_tab_hi[256] = // table of CRC values for high order byte
{
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //01
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //02
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //03
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //04
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //05
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //06
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //07
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //08
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //09
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //10
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //11
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //12
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //13
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //14
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //15
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //16
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //17
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //18
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //19
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //20
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //21
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //22
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //23
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //24
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //25
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //26
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //27
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //28
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40, //29
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //30
0x00, 0xc1, 0x81, 0x40, 0x01, 0xc0, 0x80, 0x41, //31
0x01, 0xc0, 0x80, 0x41, 0x00, 0xc1, 0x81, 0x40 //32
};
//! crc table for host communication
unsigned char code crc_tab_lo[256] = // table of CRC values for low order byte
{
0x00, 0xc0, 0xc1, 0x01, 0xc3, 0x03, 0x02, 0xc2, //01
0xc6, 0x06, 0x07, 0xc7, 0x05, 0xc5, 0xc4, 0x04 //02
0xcc, 0x0c, 0x0d, 0xcd, 0x0f, 0xcf, 0xce, 0x0e //03
0x0a, 0xca, 0xcb, 0x0b, 0xc9, 0x09, 0x08, 0xc8 //04
0xd8, 0x18, 0x19, 0xd9, 0x1b, 0xdb, 0xda, 0x1a //05
0x1e, 0xde, 0xdf, 0x1f, 0xdd, 0x1d, 0x1c, 0xdc //06
0x14, 0xd4, 0xd5, 0x15, 0xd7, 0x17, 0x16, 0xd6 //07
0xd2, 0x12, 0x13, 0xd3, 0x11, 0xd1, 0xd0, 0x10 //08
0xf0, 0x30, 0x31, 0xf1, 0x33, 0xf3, 0xf2, 0x32 //09
0x36, 0xf6, 0xf7, 0x37, 0xf5, 0x35, 0x34, 0xf4 //10
0x3c, 0xfc, 0xfd, 0x3d, 0xff, 0x3f, 0x3e, 0xfe //11
0xfa, 0x3a, 0x3b, 0xfb, 0x39, 0xf9, 0xf8, 0x38 //12
0x28, 0xe8, 0xe9, 0x29, 0xeb, 0x2b, 0x2a, 0xea //13
0xee, 0x2e, 0x2f, 0xef, 0x2d, 0xed, 0xec, 0x2c //14
0xe4, 0x24, 0x25, 0xe5, 0x27, 0xe7, 0xe6, 0x26 //15
0x22, 0xe2, 0xe3, 0x23, 0xe1, 0x21, 0x20, 0xe0 //16
0xa0, 0x60, 0x61, 0xa1, 0x63, 0xa3, 0xa2, 0x62 //17
0x66, 0xa6, 0xa7, 0x67, 0xa5, 0x65, 0x64, 0xa4 //18
0x6c, 0xac, 0xad, 0x6d, 0xaf, 0x6f, 0x6e, 0xae //19
0xaa, 0x6a, 0x6b, 0xab, 0x69, 0xa9, 0xa8, 0x68 //20
0x78, 0xb8, 0xb9, 0x79, 0xbb, 0x7b, 0x7a, 0xba //21
0xbe, 0x7e, 0x7f, 0xbf, 0x7d, 0xbd, 0xbc, 0x7c //22
0xb4, 0x74, 0x75, 0xb5, 0x77, 0xb7, 0xb6, 0x76 //23
0x72, 0xb2, 0xb3, 0x73, 0xb1, 0x71, 0x70, 0xb0 //24
0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92 //25
0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54 //26
0x9c, 0x5c, 0x5d, 0x9d, 0x5f, 0x9f, 0x9e, 0x5e //27
0x5a, 0x9a, 0x9b, 0x5b, 0x99, 0x59, 0x58, 0x98, //28