Appendix A Step 6: Repeat the action of step 2 and step 5 for the next byte in the command message till all bytes are finished processing. The last content in CRC register is CRC check value. When CRC check value in command message is transmitted, the high and low byte in calculated CRC check value must exchange with each other, i.e. the low byte is transmitted first.
Example on calculation of CRC check value with C language Unsigned char* data // Pointer of command message content Unsigned char length // Length of command message content unsigned int crc_chk （ unsigned char* data, unsigned char length ） { int j; unsigned int reg_crc=0Xffff; while （ length-- ） { reg_crc ^= *data++; for （ j=0;j ） { If （ reg_crc & 0x01 ） reg_crc= （ reg_crc>>1 ） ^ 0Xa001; /* LSB （ b0 ） =1 */ else reg_crc=reg_crc >>1; } } return reg_crc; // the value that sent back to the CRC register finally } DVP-MC operating manual A-11