Re: [Fx2lib-devel] eeprom reset program

[Gerry R. <ge...@ro...>]

Ok, this did the trick.  I fixed my git installation first, so I could 
check out the whole lib, instead of copy/paste from the viewer online.  
Built it all, seemed to build ok, then I wrote up a quick little thingy 
to read the eprom instead of write it.  Two of my devices it read back 
fine, and I found exactly what I expected, a C0 format, and to my 
surprise, only 8 bytes there.  The third one surprised me, it's got a C2 
format and appears to have some firmware embedded into a larger eprom.  
All of these are in sealed packages which will entail breaking the 
plastic to open up and look at the parts on board.  I am _hoping_ I wont 
have to resort to that, because one of them will definitely not go back 
together if I do that.

Just another 'point of interest', the third one did give me a bit of 
trouble initially, kept reading C3 back from the first byte in the 
eeprom, and that's not valid.  Then for giggles, I commented out the one 
line that sets up cpu clock, unplugged and replugged the device so that 
it comes up 'stock out of the box', and voila, now when I put it into 
reset, load my own little bit (using cycfx2prog for now), take it out of 
reset, let it run the program that dumps eprom contents into ram, reset 
again, then dump dram, there it was, a properly formatted C2 header.  It 
wont take me very long to poke at all the registers and find out what 
setup the on board firmware is putting in place.

I think I'm away to the races at this point.  Next step, gonna write 
something up that dumps the entire eprom out of all of them, then store 
that away for safe keeping, and _then_ start reprogramming eproms.



Dennis Muhlestein wrote:
> I added a reset program to the examples in the fx2lib repository.  This 
> is the program I used to reset the fx2 back to it's default state if I 
> happened to bork the eeprom data.  The eeprom/read/write routines are in 
> the i2c header file by the way.
>
> -Dennis
>
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