imuguruza / image_displayer

Design for iCE40H4XK for displaying images in a VGA dislay

Image Displayer

This design displays 100x100 8-color images for a 640x480 display. It also allows to load new images sending it through serial, using serial_img_send python script (under sw folder).

Prerequisites

You need to have installed the next tools:

• Yosys
• FuseSoc

To add this design to your FuseSoC libraries :

cd $PATH && git clone https://github.com/imuguruza/image_displayer
fusesoc library add imagedisplayer $PATH

Targets

The target of the design is the Alhambra II board.

To synthesize the design execute fusesoc run --target=top imagedisplayer.

There are also three different test benches you can execute:

• fusesoc run --target=top_tb imagedisplayer, which checks the top module design
• fusesoc run --target=uartrx_tb imagedisplayer, which checks if uart rx works
• fusesoc run --target=baudgen_tb imagedisplayer, which checks if the baud generator works

Material and pinout

I have used a VGA Pmod to create the RGB[8] and VGA control signals.

You can find the pinout in data/pinout.pcf.

In addition to this, you need to connect GND and 3v3 to feed the VGA Pmod

More info

More info about the design, in my blog!

TODO

The script serial_img_send sends images that are split in lines and coded in hex format, but without 0x. This is because of verilog $readmemh used to store the default image in RAM at synth.

A more flexible script that accepts lists split by commas and other formats would be a good to have.