Matthias Neeracher

Thanks for your question! I'm afraid I'm very rusty on this code, so please give me a few days to think about it and remind me if you haven't heard...

So I refreshed my memory; here's what's going on: 1. The bitmasks are not literally copied to the data direction registers. Only the `1` bits are used. Any pin corresponding...

I assume you connected in ISP mode? Did you follow the connection diagram? Depending on what you set the fuses to, you might need to apply the clock signal (Marked...

The Arduino 1.6 IDE has a rather different file layout compared to earlier versions, and to my shame, I still haven't made the switch, so I don't know what changes...

Would love to get a PR for your changes. I recently acquired a Due compatible board so I could start testing on a non-AVR platform. What protocol did not work?

That makes sense, to some extent, although hardware ISP is pretty much the least handwritten protocol in the suite. Maybe some setup times which were automatically assured with a slow...

Sorry that HVPP won't work for you. Have you tried ScratchMonkey in ISP mode? It uses some techniques (software SPI) to work around problematic fuse settings (i.e. it can't fix...

Thanks a lot for the note on MOSI. That should be easily fixable. The point about Atmel Studio is interesting—I’ve never tested with that, and my objective was basically to...

Unfortunately, HVPP can be rather finicky to get right because of the large number of signals involved. Doing this with a chip soldered to a board is even trickier. One...

Sorry it took me so long to start reviewing this. Some initial questions: * What's in the `.zip` file. It appears to duplicate the contents of `latest`? * It appears...