AVR-Chat

The classic example of what I'm thinking is an electronic odometer on a
car. One must write periodically to nonvolatile memory such as EEPROM
but limited to something like 10,000 erase/write cycles to represent
1,000,000.0 miles.

Have heard mention of it somewhere before but can't find/derive a
solution this morning where rather than represent every 0.1 to 1E6 in 24
bits that writes be distributed over something like 128 bits. More like
counting days with a tally on a prison wall, only toggle one bit per
unit. Set all the bits from one end to another than start back at the
beginning and clear.

The problem with writing my raw count to EEPROM is that to increment
from 0 to 1 is only one bit toggle, but 1 to 2 is one on one off, 3 is
only one on, 4 is one on two off. Wasteful of EEPROM wear.

Another thought is to use Hamming codes and write multiple copies. The
AVR has way more EEPROM than I really need as I have only about 20 bytes
total of parameters, plus need for a summing register.

-- 
David Kelly N4HHE, dkelly@HiWAAY.net
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Whom computers would destroy, they must first drive mad.