Can't say as I have. He had the code up back in '04 but appreantly there's some kind of bookkeeping issue going on with it now. He may have also had a problem with code plagarism because I remember seeing that exact same code appear on at least one other site (though I can't find it, and I'm pretty sure that wouldn't stop him from publishing it). The best I could offer is a gamepad reader program done in AVR assembly.
The good news is that the gamepad was extremely flexible in its allowable clock rates, so in your debugging you can concentrait on the software. For emulation, besides emulating the key/stick data, you'll have to respond to a few system commands and inform the Playstation of which controller you're emulating.