Raspberry Pico code.

• use VSCode I guess make -j8 ./code/pico/pico-sdk/src/rp2_common/hardware_clocks/scripts/vcocalc.py 201.4

The beginnings of a library to drive a 128x32 SSD1306 OLED display.

Simple code to drive a 320x240 ILI9341 LCD display; a text graphics mode, called mode0 that is used in a basic text editor; and the beginnings of a sprite graphics mode called mode1 that supports slightly-better-than-NES graphics and horizontal scrolling.

Mode 0 is a text-only mode that divides the screen up into 6x10 pixels tiles (so 53x24). There can be 256 Tiles defined in a 1-bit-per-pixel format. Each screen location specifies which Tile to display (1 byte) along with a foreground and background color (from a global 16 color palette, so 1 byte per grid).

The general idea of Mode 1 is:

• 320x240 pixel resolution, 16-bit color (RGB565)
• single background layer composed of a grid of Tiles
• foreground layer composed of Sprites

Most of the Background code is quickly cobbled together and only half working, but the basics are:

• can define up to 256 Tiles
• each Tile is 8x8 pixels with up to 8 colors
• can define 8 Tile palettes of 8 colors (color 0 is the screen background color)
• there is a "Map" of X * 30 tile and palette ids
• can specify a horizontal scroll offset; no vertical scrolling
• can specify a global background color (so really they are 7-color palettes)

Sprites aren't started yet, but:

• can define up to 256 Sprites
• each Sprite is 8x8 pixels with up to 8 colors
• can define 8 Sprite palettes of 8 colors (color 0 is transparent)
• each active Sprite:
  • sprite-index: 8 bits
  • x-location: 9 bits
  • y-location: 8 bits
  • orientation: 3 bits
  • palette-index: 3 bits
  • (further ahead) layer: 1 bit

Mode 2 is a 320x240 pixel framebuffer, with 16 bits per pixel (so ~150kB). Will eventually be adding drawing primitives; for now there is just a simple rectangle function.

A quick port of the Kilo text editor to the Pico. This version is built for a 320x240 ILI9341-based LCD (using Mode 0, above) instead of the Unix terminal. The Kilo editor is featured here:

• https://github.com/antirez/kilo
• https://viewsourcecode.org/snaptoken/kilo/