CRC.crc_8

You're seeing just the function crc_8, go back to CRC module for more information.

crc_8(input, seed \\ 255)

Specs

crc_8(binary(), number()) :: number()

Calculates a 8-bit CRC with polynomial x^8+x^6+x^3+x^2+1, 0x14D. Chosen based on Koopman, et al. (0xA6 in his notation = 0x14D >> 1): http://www.ece.cmu.edu/~koopman/roses/dsn04/koopman04_crc_poly_embedded.pdf

seed defaults to 0xFF if one is not given