avgai is A VGA Implementation.

The important file is "vgaControl.v", which contains the VGA controller. It
outputs the VSYNC and HSYNC signals for the VGA port, as well as indicates which
pixel should be output to the VGA display on the next clock cycle.

The inputs and outputs are:
 - clk: The input clock, currently assumed to be 50MHz
 - reset_: An active low "reset" signal
 - VGA_VS, VGA_HS: The VSync and HSync signals for VGA output, can be output
   directly
 - need: whether a pixel will be needed next clock cycle. If this is low, pixel
   output should also be low.
 - vneed, hneed: if a pixel is needed next cycle, will indicate the vertical
   and horizontal location of that pixels (from top/left to bottom/right)

The rest of the verilog files set it up to buffer some input from GPIO so that
this can be hooked up to an Arduino, as well as some example code for the
Arduino itself. The setup is that the Arduino sends packets one "word" each,
which are then put back together on the FPGA and act as "commands". Example
code is in "etchie.ino", which uses the analog pins as "knobs" and acts as an
Etch-a-Sketch with color.

I built this with a DE0 board and an Arduino Uno. To set it up with this
configuration, match pins on the Arduino Uno to the pins on the DE0 board as in
the file "PINS" and upload the relevant files to each. You may need to
reference the DE0 User Manual in doing so.