[sdiy] Digi-Mod

[Seb Francis]

Eric Brombaugh wrote:
>
> Nice looking board - I like the non-orthogonal routing.
>

It's so boring just having straight lines ;)
... plus it was a squeeze fitting it all in the space, so I had to really 
follow the shape of the free space with the traces at times (while 
making sure I kept the digital and analog nicely zoned)

> I understand that it will take a while to get the firmware finished 
> with the ambitious goals you've got for this module. Any early info on 
> what you've managed to get working so far?
>

Well at the moment I've done little more than write the framework for 
the hardware, the basic ISRs, etc, enough really to test everything is 
working.  I have a basic sampler that can record and play back, without 
changing pitch.

For ages I had this weird problem where the audio output would fade in 
rather than play immediately when playback was triggered ... until I 
realised the CODEC has a 'feature' where it auto-mutes after a certain 
number of consecutive identical samples (it then fades in after a 
mute).  So it's been a while struggling with things like that, but 
hopefully now the basics are done I can get on with the more creative bits.

I have to say that I haven't tested the CV output and MIDI parts as I'm 
not planning to use them myself, but I'm sure there's no problem as the 
CV output circuit is very simple (quite close to your 'dspicfun' board 
actually), and the MIDI circuit is one I've used on many projects before.

Seb