Re: [avrdude-dev] PDI capable bitbang programmers?

[Szymon Ulatowski]

On 05/05/2013 04:53 PM, "Ing. Daniel Rozsnyó" wrote:
> I have tried - no luck.
>
> The no use of PDI before was caused by not patching the usbasp 
> firmware with your patch - sorry. After application, the PDI mode was 
> selected for my x32a4u part. Might be good to warn the user on lack of 
> support.

true!

> But I won't get pass this:
>
> avrdude: initialization failed, rc=-1
>          Double check connections and try again, or use -F to override
>          this check.
>
>
> avrdude done.  Thank you.
>
> The signals look now very correct - but I had to remove the 100n reset 
> capacitor, as it did not get discharged at the 60-80 khz PDI_CLOCK 
> (had to use 1K series resistor instead of 820R+220R, but should not 
> matter).

...and this is the sad effect, that for some people it works and for 
some it fails (see the blogspot comments...) but there are too few 
potential users (anyone seriously engaged into xmega just buys a JTAG 
programmer) and noone has motivation AND knowledge AND hardware 
resources (2ch oscilloscope is enough) at the same time to debug the 
problem ;-) i can only test it on the only xmega chip i have - and it 
works :-P

sz.