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Capstone CRC-16 Calculation Calculating a CRC16 is performed using the following method: 1. Initialize the 16-bit CRC value to 0xFFFF 2. Exclusive-OR (XOR) the byte with the 16-bit CRC CHAPTER 10 COMMUNICATIONS 3. When low bit of 16-bit CRC is 1, shift the entire word right 1-bit, Exclusive-OR (XOR) with 0xA001, and proceed to step 5 4. Repeat step 3 for all 8 bits of each byte 5. When low bit of 16-bit CRC is 0, shift the entire word right 1-bit 6. Repeat from step 2 for each byte in sequence The 16-bit CRC is appended to the message low-byte first followed by high-byte. (NOTE: performing a CRC16 calculation on a stream of bytes with its CRC16 value appended will always result with the value 0x0000). Sample “C” Code: The following is sample C-code for the CRC error checking. static UWORD crc_add (UCHAR *data, UWORD length, UWORD crc_reg) { int i; while (length--) { crc_reg ^= *data++; for (i = 0; i < 8; ++i) if (crc_reg & 1) crc_reg = (crc_reg >> 1) ^ 0xa001; else } crc_reg >>= 1; return crc_reg; } 410066 Rev C (June 2009) Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. 10-25PDF Image | CAPSTONE C200 MICROTURBINE TECHNICAL REFERENCE
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