fix(ws2812): Bit order of WS2812 data stream

[frank26080115]

Fixes #4399

(bit order of data sent to WS2812 was LSB first, which is wrong)

Summary of changes:

Sends MSB first, as per WS2812 datasheet

[pfeerick]

Indeed it is... as you say, WS2812 is MSB order, not LSB... lol!

[pfeerick]

btw, can you add the test lua script source? ;)

[frank26080115]

local function init()
    police_oldtime = getTime()
    police_cycle = 0
    x = 0
    y = 0
end

local function run()
  for i=0, LED_STRIP_LENGTH - 1, 1
  do
    if (y == 0) then
      setRGBLedColor(i, x, 0, 0)
    elseif (y == 1) then
      setRGBLedColor(i, 0, x, 0)
    elseif (y == 2) then
      setRGBLedColor(i, 0, 0, x)
    end
  end
  if ((getTime() - police_oldtime) > 8) then
    police_oldtime = getTime()
    police_cycle = 1 - police_cycle
    x = x + 1
    if (x > 255) then
      x = 0
      y = y + 1
      if (y > 2) then
        y = 0
      end
    end
    applyRGBLedColors()
  end
end

local function background()
  -- Called periodically while the Special Function switch is off
end

return { run=run, background=background, init=init }

[3djc]

lol, because I did set randomly value at 50 because I was indoor and didn't want it bright, we didn't spot it. Thanks for the fix

[richardclli]

I spot strange behavior when I trying to play around the LUA for different brightness, but not dig deep into the problem, nice catch for a fix.