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VgaPico

This is a VGA library for the Raspberry Pi Pico. It is based on the Hunter Adams code.

The intention is to be easy to learn and provide 320x240 resolution with 64 colors. Which, in my opinion, is a great resolution for 8-bit based computers.

PICO_SDK_PATH

Make sure you set the PICO_SDK_PATH either in the CMakeLists.txt file or your local OS environment variables. This is required to build the project.

Useful videos

https://www.youtube.com/watch?v=KCGy7Gz1QrE

Features

  • 320x240 resolution
  • 64 colors
  • 5x7 pixel font tied to 8x8 boundries. This allows for 40x30 characters on the screen. (original code)
  • Added PETSCII font with true 8x8 character drawing and each character can have their own 64 color background and foreground!
  • Simple buffer for drawing. Just draw to the buffer and everything is blitted in real time.
  • 6-bit RGB color palette of R2G2B2. This allows for 64 colors.
  • One byte per pixel (upper two bits are ignored).

Issues

  • There are plenty! This is a work in progress.
  • I'm not sure why changing the drawPixel bound checks for X will cause all of the colors to be messed up and odd behaviors.

Future

  • Add support for scrolling text.
  • Add support for sprites.
  • Add support for scrolling.
  • Etc...

Wiring

  • HSYNC = GPIO14
  • VSYNC = GPIO15
  • RED = GPIO2 & GPIO3
  • GREEN = GPIO4 & GPIO5
  • BLUE = GPIO6 & GPIO7

Cool demos!

demo01.jpg

demo02.jpg

demo03.jpg

Not completely working sprites (lol)

sprites.jpg

Commodore PETSCII Font!!

demo04.jpg

Fonts

Here is a good site to get different PETSCII fonts: http://www.6502.org/users/sjgray/computer/cbmchr/cbmchr.html

Also, checkout the petscii.py file for a crud program to convert binary font data into a "petscii.h" include file.

The main PETSCII file is called (chargen) and it can be found on the Web (also included in the petscii folder).