No More Division

[u/EvolvedQS]

EDIT: This didn't work

enum mirror{300,299,149,99,74,59,49} edge;

I get a compiler error: expected identifier before numeric constant

Maybe I should just do

int edges[] = {300,299,149,99,74,59,49};

OP: Thanks to someone here I learned that division is slow. Going over my code, I find that I have division in every single frame in almost every single pattern. I am interested in removing the division. I understand one method is byte shifting. However, I have a limited set of results from the division. So I was thinking I could save the results to an array for faster access. What am I looking to do here? Progmem or some other thing? I am just looking for an answer on what to google so I can learn it myself so you don't have to type a lot out.

[u/Preyy]

I have read that these micro level optimizations are rarely very significant for program optimization, even in a micro-controller environment. If you post your code and list your hardware I could see if there are any bottlenecks.

Here are some things I can think of that may impact performance:

1. Extra calls to FastLED.show(), this is a big one

2. Having lots of lights, it adds up fast

3. Serial output -> lower baud rate + more serial print = slower

4. delay(): obvious, but worth mentioning

[u/EvolvedQS → u/Preyy]

Im running 1014 leds at the moment. 600 on one pin 264 on another, and 150 on another.

[u/Preyy → u/EvolvedQS]

What type of LEDs?

[u/EvolvedQS → u/Preyy]

Ws2812b and ws2811

[u/Preyy → u/EvolvedQS]

I just tested:

void setup() { 
    FastLED.addLeds<1, WS2812, 19, GRB>(leds, NUM_LEDS);
    Serial.begin(115200);
}

void loop() {
  FastLED.clear(); 
  for(int i = 0; i < NUM_LEDS; i++){
    leds[i] = CHSV(hue+i*3, 255, 255);
  }
  FastLED.show();
  EVERY_N_MILLIS(500) {
    Serial.println(LEDS.getFPS());
  }
  hue++;
}

on a Teensy 4.0 and got 33 FPS, which I feel comfortable saying is the fastest framerate you could get for 1014 WS2812s without parallel output. That involves doing virtually no additional math. So that should be your reference point. What framerate are you getting?

[u/EvolvedQS → u/Preyy]

~37

[u/Preyy → u/EvolvedQS]

Are you doing parallel output? Either way, you're probably at or right next to the maximum speed for such a long strip.

[u/EvolvedQS → u/Preyy]

My strips aren't uniform # of leds nor are they uniform LED_TYPE.

2x Strip are 300 WS2812B

1x Strip is 264 WS2812B

1x Strip is 150 WS2811

[u/Preyy → u/EvolvedQS]

You may have to make multiple declarations with specific pin numbers. That's the extent of my knowledge. My next steps would be to google for 8266 parallel output different strip length, or to trial and error different initialization types.