[sdiy] Microchip DSP kit $60 > AVR32

[Eric Brombaugh]

Roy J. Tellason wrote:

>> I've recently bought the Freescale Soundbite board that a few others
>> on this list are using. It's a much more serious DSP, and would make
>> a rackmount digital effects processor with the addition of just a
>> power supply and a rack case. It has 4 stereo ins and four stereo
>> outs, and optical digital in/out if you want it.
> 
> Is that last one for MIDI?

Unfortunately no - that's an optical S/PDIF port that can't be used for 
MIDI.

>> The only problem would be controlling it, for which you need a front panel
>> with knobs and switches connected to another processor which then talks to
>> the DSP via SPI or I2C.
> 
> Those protocols are also on my list to deal with getting into one of these 
> days.  Thinking about some of the commercial gear I've seen schematics of and 
> worked on to some limited extent,  I remember some two-wire and three-wire 
> interfaces and am wondering if those mfrs. used either of those,  or just 
> their proprietary stuff.  Anyone know?

Most mfgs. support either I2C (two-wire) or SPI (3/4-wire) serial 
protocols these days. They're incredibly easy to use. There were a few 
variations on these (eg NatSemi's Microwire) which can usually be fudged 
to work with the serial I/O peripherals on modern MCUs.

Eric