Xiaofan Chen wrote:
> Is it possible to add a command line switch to tell that EasyProg not to
> vary voltage and/or not to control the voltage? I know this may require
> a firmware update as well.
>
> I think it is good to have a power supply and variable Vdd. This is one
> aspect where EasyProg better than Wisp628 (the other is the dsPIC/PIC12
> base line support). But it may be good to have the option to switch
> this off.

For some PICs this would be possible, although the EasyProg will always put
a load on Vdd since it uses an active pullup and passive pulldown.  Some
PICs require Vpp before Vdd to enter programming mode, so this won't work
for those.  If you don't want the EasyProg to control Vdd and the PIC can
accept Vdd before Vpp, then you can just not hook up the Vdd line.  However
the EasyProg will still do two verify passes although both will be at the
target Vdd voltage.  I suppose a command line option could support this
better.

I'm still not sure though that John has actually tried programming his dsPIC
with the target circuit power off.  I expect this can be made to work, but
we need more details of what happens when he tries it.


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