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AT42QT1111-MU Datasheet(PDF) 47 Page - ATMEL Corporation |
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AT42QT1111-MU Datasheet(HTML) 47 Page - ATMEL Corporation |
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47 / 50 page  47 9571A–AT42–02/10 AT42QT1111-MU/AT42QT1111-AU Appendix A. CRC Calculation If the use of a cyclic redundancy check (CRC) during data transmission is enabled, the host must generate a valid CRC so that this can be correctly compared to the corresponding CRC generated by the QT1111. This appendix gives example C code to show how the CRC can be generated by the host. /*======================================================================= unsigned char calc_crc(unsigned char crc, unsigned char data) --------------------------------------------------------------------------- Purpose: Calculate CRC for data packets Input : CRC, Data Output : Updated CRC Notes : - =========================================================================*/ unsigned char calc_crc(unsigned char crc, unsigned char data) { unsigned char index; unsigned char fb; index = 8; do { fb = (crc ^ data) & 0x01u; data >>= 1u; crc >>= 1u; if(fb) { crc ^= 0x8c; } } while(--index); return crc; } /* Example Calling Routine */ unsigned char calculate_config_checksum(void) { int i; unsigned char CRC_val = 0; unsigned char setup_data[42] = { 0xB2, 0x00, 0x38, 0x12, 0x06, 0x06, 0x12, 0x07, 0xFF, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x32, 0xFF, 0x00, 0x29, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0X00, 0x7A, 0x7A, 0x7A, 0x7A, 0x7A, 0x7A, 0x7A, 0x7A, 0x7A, 0x7A, 0x7A }; for(i = 0; i < sizeof(setup_data); i++) { CRC_val = calc_crc(CRC_val, setup_data[i]); } return(CRC_val); } |
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