DSPWing

Opensourcing this long ongoing project of mine cause it's kinda cool. The idea is separated into 2 parts, the hardware components and the software(ish)

Overall project state: clean audio playback without glitches. no effects existing yet.

Hardware

The circuit is quite simple, includes an LM386 amplifier that optionally can be bypassed using a push-button, and an MCP3208 12bit 8channel ADC that is capable of highfrequency sampling (96k audio).

There's a fritzing file included in this project, but don't try and order it as is as the PCB design is not complete nor tested. ( I never left the breadboard phase )

I suspect that this schematic could be improved with a couple of pulldown resistors on both IC's input pins, sometimes i hear some wierd cap-noise.

Software

It's an Papilio DesignLab library.

Usage & Installation:

• Download DesignLab (1.0.7+)
• clone this repository into your Sketchbook/libraries folder
• Include the dspwing module in your papilio/zpuino circuit using DesignLab/Xilinx ISE
• Generate a bit file and load it to your papilio.
• Develop some effects in VHDL

Example sketch:

#include <DSP_Wing.h>
DSP_Wing dsp;
void setup() {
  dsp.setup(6); // Initialize wing on wishbone slot 6
}
void loop(){
  delay(1000);
}

Note to self:

Todo:

• Tremolo Module (depends on sample-clk)
• Refactor SPI pins to directly connect to wing/gpio connector
• Implement fx_ctrlbus
• Export an output signal that indicates when a new sample is available for processing.

Right now I've got problems with goddamn xilinx ISE that keeps crashing.