Allows strings of ws2811 pixels to create a graphics display

[mores]

No description provided.

[stefanhaustein]

Can you explain this some more?

The WS2811 driver already has a ctor supporting a pixel map:

pi4j-drivers/src/main/java/com/pi4j/drivers/display/graphics/ws281x/Ws281xDriver.java

Line 81 in 4cc9b41

public Ws281xDriver(Spi spi, int width, int height, int[] pixelMap) {

And it's possible to attach multiple drivers to a display for different display regions.

Is this insufficient for some cases? How?

[mores]

AFAIK - The existing ws281x driver uses SPI to communicate with the pixels.

In my case - I am using a https://pixelcontroller.com/store/featured/99-falcon-picap-v2.html which utilizes /dev/dri/card0 and requires a device tree overlay. ( perhaps in the future this code could be included in p4j )

This HAT is capable of controlling 810 pixels on 4 ports = 3240 pixels total.
These pixels can then be inserted into a matrix like this https://gilbertengineeringusa.com/products/matrix-4x8 in a zig zag pattern to create a "graphics display".

[stefanhaustein]

Sorry for the delay... Are you going to add an actual driver? I'd prefer if we could start there and then see if we can share code with the existing ws281x driver zigzag management....

[mores]

There are multiple parts to "driving this hat":

1. deviceTreeOverlay: https://github.com/mores/TheMissingLink/tree/main/Falcon_PiCap_V2/deviceTreeOverlay
2. c library to call drm methods: https://github.com/mores/TheMissingLink/blob/main/Falcon_PiCap_V2/c/drm.c
3. java ffm to call c library and ColorBufferWriter.java:
   https://github.com/mores/TheMissingLink/tree/main/Falcon_PiCap_V2/ffm/src/main/java/io/github/mores