Uart branch flickers and flahes with 150 neopixels

[weboide]

Doing a simple animation with 150 neopixels lighting up one neopixel after the other (code below), part of the strand flashes randomly. (see https://www.youtube.com/watch?v=BjJZworuFgM)
I've got the Huzzah ESP8266 set up at 160Mhz in the Arduino IDE with the Uart branch of NeoPixelBus and the Esp Arduino library version 2.0.0. (Arduino 1.6.5)

#include <NeoPixelBus.h>

#define pixelCount 150 // this example assumes 4 pixels, making it smaller will cause a failure
#define pixelPin 2  // make sure to set this to the correct pin

#define colorSaturation 128

NeoPixelBus strip = NeoPixelBus(pixelCount, pixelPin);

RgbColor red = RgbColor(colorSaturation, 0, 0);
RgbColor green = RgbColor(0, colorSaturation, 0);
RgbColor blue = RgbColor(0, 0, colorSaturation);
RgbColor white = RgbColor(colorSaturation);
RgbColor black = RgbColor(0);

void setup()
{
    // this resets all the neopixels to an off state
    strip.Begin();
    strip.Show();
}

void wipe(RgbColor col)
{
    for (uint8_t pixel = 0; pixel < pixelCount; pixel++)
    {
      strip.SetPixelColor(pixel, col);
      strip.Show();
      delay(31); // 31ms ~= 30hz?
    }
}

void loop()
{
    wipe(red);
    wipe(black);

    wipe(green);
    wipe(black);

    wipe(blue);
    wipe(black);

    wipe(white);
    wipe(black);
}

[Makuna]

Could you experiment and see if can find at what count it does consistently work? 49?

[weboide]

48 is when it starts flashing, before that pixels #1 through #pixelCount are lighting up correctly and seem stable (although some pixels beyond #pixelCount are lighting up and stay on for some reason, probably due to no reset being sent to them).

[Makuna]

I submitted some changes to the uartdriven branch, could you try these. Let me know the results. Again, try the 49 and then try the full count.

[weboide]

Nice Job! the flashes stopped! I tried with 49 and with 150 and even decreased my delay to 1 (instead of 31) and things are smooth!

[Makuna]

fixed with pull #39