[time-nuts] FE-5680 Linux command line tool

Tom Wimmenhove tom.wimmenhove at gmail.com
Fri Oct 10 10:30:08 EDT 2014

I recently came across a thread on this list about undocumented FE5680
commands. I have been using a little linux command line tool I wrote years
ago for tuning the unit and decided to add these commands to it.
Since this mailing list was the place I found the unit (someone linked to
an ebay seller) I figured I' d join the list and throw it on here :)

Now, the bad news. I had my unit running overnight while logging the serial
command output that reads the ADC, and in the morning it was no longer
locked. The 10MHz signal disappears about 5 seconds after power-on, and
programmed offset was somehow reset to zero (it had been set to -645). So
it appears as if the internal EEPROM has been corrupted.
I read a post from Elio Corbolante where he posted EEPROM and firmware
dumps. Anyone have any idea on how to re-write this firmware back into the
EEPROM by hand (would this be possible through JTAG, or do I actually have
to solder the chip out of there? :) ) Or maybe there's someone willing to
sell their broken unit I could take the chip out of?


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