j-c / snarc Goto Github PK

Attempt to average the number of writes over the entire EEPROM. This may be especially important if the entire access list is pushed to the SNARC.

Currently using 12 bytes per tag. 10 for the ascii representation of the tag (hexadecimal), 1 for the ending null char, 1 for yes/no access.

If the tag's value is stored as number (or a set of octets), we only need 5 bytes for the tag and 1 for the yes/no. This is assuming that we still need the access byte. Otherwise if revoked tags are to be deleted, we only need 5 bytes per tag.

Or we could also use:
CRC-32 hash (33bits), which is still 5 bytes in eeprom. But we have 7 extra bits to use.
CRC-16 (17bits), 3 bytes + 7 extra bits.

Or FNV-1a hash (32bits). 4 bytes, no extra data.

Considering the data being stored, is there a benefit of using a hash rather than just the 5 octets? Not a major issue since the actual source of data will be stored elsewhere and the arduino will grab the entire list and save it.