Not technically a PIC but an ARM Cortex part with a neat built in 32 bit
CRC calculator.  If possible I'd like to use this for generating CRCs
for a large number of non-volatile calibration values, i.e. each
parameter will have it's own CRC so in the event of failure either a
safe default can be used, or the system will not start up if critical
parameters have been lost.  However, 32 bits is major overkill for some
of the fields which may only be 8, 16 or 32 bit values, and would chew
through EEPROM space and increase read times.  Other NV parameters are
larger (lookup tables etc) and may justify a full 32 bit CRC.

 

In these cases would it be valid to either use part of the generated
CRC, or to combine parts of it (e.g. XOR upper and lower 16 bits), or
should I forget trying to use it?

 

Mike


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