can Graphics handle a 4 by 4 of 8x8 neopixel board

Posted on Sun 28th, February 2016

• #1

MaBe

how to drive 16 tiled pixel square plates (8x8) with GRAPHICS ?

this is what I do at the moment:

build 4 columns, each with 4 plates and address them as four separated 8x32 plates, so everything has to be done four times and more ......

I would prefer to wire them up as zigzag and everything only one time if possible.

Can I overload Graphics coordinate calc function with my own to handle this, or is this mapping already there and I just missed it ?

Anyone else experimenting with more than 3 plates to draw big text, icons, pictures ..... ?

• #2

Gordon

All I can suggest is that you access the underlying array with g.buffer and re-order the pixels yourself before sending them.

// g = Graphics
leds = new Uint8Array(16*16*3);

g.flip = function() {
  leds.set(new Uint8Array(g.buffer,0,8*3), 0);
  leds.set(new Uint8Array(g.buffer,8*3,8*3), 8*8*3);
  leds.set(new Uint8Array(g.buffer,2*8*3,8*3), 8*3);
  // etc ...
  SPI1.send4bit(leds,...);
}

• #3

MaBe

This is more than I expected - thanks !

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can Graphics handle a 4 by 4 of 8x8 neopixel board

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Espruino