Teensy 3.2 Octows2811 fastled flickering problem

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clfaye

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Hi - I am having a flickering problem with the fastled library. I am using Teensy 3.2 and fastled 3.1.6.

I'm not doing anything complicated - just getting the hardware set up and tested. The teensy is connected to a 5m, 12v, 100 pixel WS2811 strip through a 74HCT245 (Vcc at 5v) and a 100ohm resistor. I am using the DemoReel100 from the fastled examples folder, using pin 2 as the output pin. The strip flickers dramatically regardless of brightness level.

I have tried decreasing the clock speed of the teensy from 96 Mhz to 48 and 72Mhz without any difference.

I have also added the line: #define FASTLED_ALLOW_INTERRUPTS 0, but that doesn't help either.

When I run the "rainbow" example from the octows2811 example folder - without any change in hardware - the rainbow works perfectly with no flickering. So, I know that the hardware is connected correctly.

Any ideas?
 
I have the OctoWS2811 test board right here, 240 LEDs per pin.

If you post the code, I'll copy & paste into Arduino and run it here on the known-good test hardware. Should be easy to see what it does on the first 100 LEDs. But I don't have a lot of time for guesswork, so please post the exact code I should copy & paste into Arduino.
 
Hi Paul!

Here is the code for the DemoReel100. The Octows2811 library seems to be working fine. I would use it, but I need to do 12 strips in parallel. The only thing I added to this example is "#define FASTLED_ALLOW_INTERRUPTS 0
", which didn't make any difference

Code:
#include "FastLED.h"
#define FASTLED_ALLOW_INTERRUPTS 0
FASTLED_USING_NAMESPACE

// FastLED "100-lines-of-code" demo reel, showing just a few 
// of the kinds of animation patterns you can quickly and easily 
// compose using FastLED.  
//
// This example also shows one easy way to define multiple 
// animations patterns and have them automatically rotate.
//
// -Mark Kriegsman, December 2014

#if defined(FASTLED_VERSION) && (FASTLED_VERSION < 3001000)
#warning "Requires FastLED 3.1 or later; check github for latest code."
#endif

#define DATA_PIN    2
//#define CLK_PIN   4
#define LED_TYPE    WS2811
#define COLOR_ORDER RGB
#define NUM_LEDS    100
CRGB leds[NUM_LEDS];

#define BRIGHTNESS          255
#define FRAMES_PER_SECOND  120

void setup() {
  delay(3000); // 3 second delay for recovery
  
  // tell FastLED about the LED strip configuration
  FastLED.addLeds<LED_TYPE,DATA_PIN,COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
  //FastLED.addLeds<LED_TYPE,DATA_PIN,CLK_PIN,COLOR_ORDER>(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);

  // set master brightness control
  FastLED.setBrightness(BRIGHTNESS);
}


// List of patterns to cycle through.  Each is defined as a separate function below.
typedef void (*SimplePatternList[])();
SimplePatternList gPatterns = { rainbow, rainbowWithGlitter, confetti, sinelon, juggle, bpm };

uint8_t gCurrentPatternNumber = 0; // Index number of which pattern is current
uint8_t gHue = 0; // rotating "base color" used by many of the patterns
  
void loop()
{
  // Call the current pattern function once, updating the 'leds' array
  gPatterns[gCurrentPatternNumber]();

  // send the 'leds' array out to the actual LED strip
  FastLED.show();  
  // insert a delay to keep the framerate modest
  FastLED.delay(1000/FRAMES_PER_SECOND); 

  // do some periodic updates
  EVERY_N_MILLISECONDS( 20 ) { gHue++; } // slowly cycle the "base color" through the rainbow
  EVERY_N_SECONDS( 10 ) { nextPattern(); } // change patterns periodically
}

#define ARRAY_SIZE(A) (sizeof(A) / sizeof((A)[0]))

void nextPattern()
{
  // add one to the current pattern number, and wrap around at the end
  gCurrentPatternNumber = (gCurrentPatternNumber + 1) % ARRAY_SIZE( gPatterns);
}

void rainbow() 
{
  // FastLED's built-in rainbow generator
  fill_rainbow( leds, NUM_LEDS, gHue, 7);
}

void rainbowWithGlitter() 
{
  // built-in FastLED rainbow, plus some random sparkly glitter
  rainbow();
  addGlitter(80);
}

void addGlitter( fract8 chanceOfGlitter) 
{
  if( random8() < chanceOfGlitter) {
    leds[ random16(NUM_LEDS) ] += CRGB::White;
  }
}

void confetti() 
{
  // random colored speckles that blink in and fade smoothly
  fadeToBlackBy( leds, NUM_LEDS, 10);
  int pos = random16(NUM_LEDS);
  leds[pos] += CHSV( gHue + random8(64), 200, 255);
}

void sinelon()
{
  // a colored dot sweeping back and forth, with fading trails
  fadeToBlackBy( leds, NUM_LEDS, 20);
  int pos = beatsin16(13,0,NUM_LEDS);
  leds[pos] += CHSV( gHue, 255, 192);
}

void bpm()
{
  // colored stripes pulsing at a defined Beats-Per-Minute (BPM)
  uint8_t BeatsPerMinute = 62;
  CRGBPalette16 palette = PartyColors_p;
  uint8_t beat = beatsin8( BeatsPerMinute, 64, 255);
  for( int i = 0; i < NUM_LEDS; i++) { //9948
    leds[i] = ColorFromPalette(palette, gHue+(i*2), beat-gHue+(i*10));
  }
}

void juggle() {
  // eight colored dots, weaving in and out of sync with each other
  fadeToBlackBy( leds, NUM_LEDS, 20);
  byte dothue = 0;
  for( int i = 0; i < 8; i++) {
    leds[beatsin16(i+7,0,NUM_LEDS)] |= CHSV(dothue, 200, 255);
    dothue += 32;
  }
}
 
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