standardgalactic / pico-playground Goto Github PK

This repo is similar to pico-examples but utilizing additional libraries from pico-extras

Note that most of these examples are neither fleshed out nor well documented. They mostly serve the purpose of playing with/testing particular areas of functionality (mostly audio/video related)

Finally, you may wonder why many of these demos set the system clock to 48Mhz. The reason is that until we had physical chips, we were running at a fixed 48Mhz system clock using an FPGA. Most of these examples were written before the RP2040 design was final, so they were all developed with that fixed 48MHz system clock. As a result some of the examples do things in a way that you wouldn't necessarily need to if you had more clock speed available (which you do), but on the plus side, you have that much more time to do even more things!

In scanout video, every pixel is driven by the PIO every frame, and a framebuffer is not (necessarily) used (which is useful when you only have 264K of RAM).

For a fuller description of scanout video see here

Name	Screenshot	Description
demo1		So named because it was the first demo program written that used video.. it is a bit dated now and hails from a time where there was much less RAM on the RP2040
flash_stream		Streams video data out of flash fast enough to drive 640x480x60fps bitmap display
hscroll_dma_tiles		A horizontal scrolling test app which uses a second video plane (PIO) to overlay sprites
mandelbrot		A mandelbrot generator using a 320x240x16 framebuffer
mario_tiles		Confusingly named as a reference to Super Mario Kart's tiled psuedo-3D rendering. This is similar to hscroll_dma_tiles except the whole tiled scrolling area is now rotated and zoomed.
scanvideo_minimal		A very basic video output generator which generates a test pattern
render		A very dated rendering library used by demo1 - avoid!
sprite		A small sprite library used by sprite_demo
sprite_demo		Some bouncing Eben heads
test_pattern		Display color bars
textmode		Shows off chained DMA to generate scanlines out of glyph fragments via DMA/PIO

The above are intended to be used with the VGA demo board as described in Hardware Design with RP2040 however it is possible to wire your own VGA output according to the following schematic: 

Examples of using low power mode; these use pico_sleep from pico_extras which is not yet stable.

Examples of adding additional stdio support. Note the interface for stdio drivers is not yet considered stable even though it is in the Pico SDK