> By the way, will you release your code one it is ready?

Sure. But it will be slow... until its functions are all tested. But 
if you want to see the code now, mail me offlist. I still have some 
hardware issues to settle... the waveform looks correct on scope but 
the PIC reads 0x3FCF instead of 0x3FFF... Still I confirm that's no 
bug in the read routine. I think it has something to do with the level 
of the waveform or overshot/undershot etc.


> Now that PICKit 2 is on the horizon, more people will be willing to
> hack it to do more.

We will see how the PICKit 2 design... As far as PICKit 1 hardware is 
concerned, I see there is a problem if you want to extend its 
capability. Namely the Vpp output from the charge pump circuit. I have 
seen on my scope last night, it will raise to 12V then drop back in 
curve to somewhere slightly lower than 10V before up again after the 
PID makes the necessary correction. I think this happen because the 
firmware prepare the Vpp to 12V in advance before turning on the Vpp 
transistor. Anyway when it's loaded by the target PIC, a new 
adjustment needed and it takes time for the PID to perform. This will 
not be a problem for PIC12F675 as the Vpp range is Vdd+3.5V until 
13.5V!

I like the bus-powered USB product! The design of PICKit 1 is great to 
get 13.5V (and its level is controllable through the PID) out of the 
5V from USB bus. Anyway if the PID controlled Vpp can't be improved, I 
see there is a very limited device, which can be supported. Anyway I'm 
not a hardware guru and am seeking for a solution...

> And you are definitely doing the pioneer work.

Well I don't think I am. I bet there must be someone out there doing 
the same... :)


Best regards,
WH Tan 


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