[sdiy] dsPIC FPGA project update

[Eric Brombaugh]

Hi Csaba,

This is the second audio FPGA board I've done in the last year. The 
earlier one was based on an ARM processor with USB and MIDI I/O and is 
documented here:

http://members.cox.net/ebrombaugh1/synth/armfpga/index.html

The 45degree part in the upper right-hand corner of the board is an SRAM 
that's used for delay effects.

There are a few differences in goals between that board and the current one:

* try SD card access from a dsPIC (works pretty well)
* try out the newer Spartan 3A parts (only need two supplies)
* focus on CV input instead of USB / MIDI
* smaller overall footprint - 3x3" instead of 3x4"
* try wavetable from Flash memory.

and a few other things. Basic idea though is something that would fit 
into a modular synth with CVs instead of buttons/LCDs & MIDI. It's 
working out so far - hope to get the wavetable ideas going soon.

As far as future plans: This 3x3 board is almost exactly the same size 
as a Beagle Board:

http://beagleboard.org/

Perhaps my next project will involve a daughter card for a Beagle with 
FPGA, audio, CV and possibly even RF interfaces. Nothing's sure at this 
point though - have to finish the current one first...

Eric

On 02/03/2010 03:18 PM, Csaba Zvekan wrote:
> Hi Eric,
>
> Nice work there , congratulations ! I must admit I am a bit out of touch
> with everything as I am busy with actually recording music :) these
> days. My question is : is this the second revision of the board ? I
> remember a similar project where you had the CODEC I believe in a 90°
> angle set in the upper right corner . Or is that a different project ?
> Are you planing in doing something with a PIC32 or a i.MX233 and Xilinx
> FPGA in the near future , just for fun :) ?
>
> Csaba
>
>
> On Feb 3, 2010, at 2:48 AM, Eric Brombaugh wrote:
>
>> I've just updated the project page for my dsPIC FPGA board with new
>> status and all the design materials including schematics, PCB files,
>> bill-of-materials, Gerbers and source code. Find more here:
>>
>> http://members.cox.net/ebrombaugh1/synth/dsPIC_fpga/index.html
>>
>> At this point all the hardware is working and the next step is to
>> actually load it up with some code that sounds nice. I'll update more
>> as this progresses.
>>
>> Comments/questions/criticism welcome!
>>
>> Eric
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>