This is an old post, preserved for reference.
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I saw this kit advertised on Tindie (Simple EEPROM Programmer shield for Arduino Mega) and thought it looked interesting.
author's blog. We've all had fun in the past with Arduino code that doesn't build and needs specific old versions of certain libraries, but I am pleased to say it built and programmed fine.
delayMicroseconds function), and that worked. I left these are separate commands, as they probably only apply to Atmel chips. P to protect the chip, U to unprotect.
The sequence above show testing writing is working, enabling SDP and writing more. Those writes didn't appear. Enabling SDP and repeating and the writes are now retained. Note the first byte is overwritten with 00 during the lock / unlock operation. Some data needs to be written to any address to complete the lock / unlock process. A future improvement may be to read that byte before lock / unlock and write it back afterwards with the original value. There is also a function to erase the whole chip, but that requires a 12V pulse which is not easily available in this case.
So, I bought this kit to learn more about programming EEPROMs, and it certainly worked. I sent my updates to the author, and he has already incorporated them into the official V0.02 release (available on his blog).