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Rewrite code with FastLED + Gamma Correction

A project log for SkyLight

SkyLight : Get beyond TV's ambient light

Songkord ThirachaiSongkord Thirachai 03/21/2016 at 18:590 Comments

Today, i rewrite a code of ambient light of arduino module applied FastLED library carefully. Why? there are 3 important thing, 1) the legacy code of adalight is based on SPI that is used by a RF module too. I think move pin in code of adalight from HW to SW is not complicated. 2) FastLED library support many LED brand. Finally, Gamma Correction is applied.

/* This SkyLight Demo used Adalight(From octows2801 lib) + FastLED lib  */

#include "FastLED.h"

// How many leds in your strip?
#define NUM_LEDS 50

// For led chips like Neopixels, which have a data line, ground, and power, you just
// need to define DATA_PIN.  For led chipsets that are SPI based (four wires - data, clock,
// ground, and power), like the LPD8806 define both DATA_PIN and CLOCK_PIN

//--- SPI ---
//#define DATA_PIN 11
//#define CLOCK_PIN 13

//--- Software ---
#define DATA_PIN 2
#define CLOCK_PIN 4
#define GND_PIN 5

// Define the array of leds
CRGB leds[NUM_LEDS];

// Gramma Correction (Defalt Gamma = 2.8)
const uint8_t PROGMEM gammaR[] = {
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,
    1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  2,
    2,  2,  2,  3,  3,  3,  3,  3,  3,  3,  4,  4,  4,  4,  4,  5,
    5,  5,  5,  5,  6,  6,  6,  6,  7,  7,  7,  7,  8,  8,  8,  9,
    9,  9, 10, 10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 14, 14, 14,
   15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22,
   23, 24, 24, 25, 25, 26, 27, 27, 28, 29, 29, 30, 31, 31, 32, 33,
   33, 34, 35, 36, 36, 37, 38, 39, 40, 40, 41, 42, 43, 44, 45, 46,
   46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
   62, 63, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 78, 79, 80,
   81, 83, 84, 85, 87, 88, 89, 91, 92, 94, 95, 97, 98, 99,101,102,
  104,105,107,109,110,112,113,115,116,118,120,121,123,125,127,128,
  130,132,134,135,137,139,141,143,145,146,148,150,152,154,156,158,
  160,162,164,166,168,170,172,174,177,179,181,183,185,187,190,192,
  194,196,199,201,203,206,208,210,213,215,218,220,223,225,227,230 };
  
const uint8_t PROGMEM gammaG[] = {
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,
    1,  1,  1,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  2,  2,  2,
    2,  3,  3,  3,  3,  3,  3,  3,  4,  4,  4,  4,  4,  5,  5,  5,
    5,  6,  6,  6,  6,  7,  7,  7,  7,  8,  8,  8,  9,  9,  9, 10,
   10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
   17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
   25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
   37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
   51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
   69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
   90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
  115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
  144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
  177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
  215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255 }; 


const uint8_t PROGMEM gammaB[] = {
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
    0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,
    1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  2,  2,  2,
    2,  2,  2,  2,  2,  2,  3,  3,  3,  3,  3,  3,  3,  4,  4,  4,
    4,  4,  5,  5,  5,  5,  5,  6,  6,  6,  6,  6,  7,  7,  7,  8,
    8,  8,  8,  9,  9,  9, 10, 10, 10, 10, 11, 11, 12, 12, 12, 13,
   13, 13, 14, 14, 15, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 19,
   20, 20, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 27, 27, 28, 28,
   29, 30, 30, 31, 32, 32, 33, 34, 34, 35, 36, 37, 37, 38, 39, 40,
   40, 41, 42, 43, 44, 44, 45, 46, 47, 48, 49, 50, 51, 51, 52, 53,
   54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 69, 70,
   71, 72, 73, 74, 75, 77, 78, 79, 80, 81, 83, 84, 85, 86, 88, 89,
   90, 92, 93, 94, 96, 97, 98,100,101,103,104,106,107,109,110,112,
  113,115,116,118,119,121,122,124,126,127,129,131,132,134,136,137,
  139,141,143,144,146,148,150,152,153,155,157,159,161,163,165,167,
  169,171,173,175,177,179,181,183,185,187,189,191,193,196,198,200 };


void setup() {
  // sanity check delay - allows reprogramming if accidently blowing power w/leds
  delay(500);
  //FastLED.addLeds<WS2812,DATA_PIN,RGB>(leds,NUM_LEDS);
  //FastLED.addLeds<WS2801, RGB>(leds, NUM_LEDS); // --- SPI ---
  FastLED.addLeds<WS2801, DATA_PIN, CLOCK_PIN, RGB>(leds, NUM_LEDS); // --- Software ---

  Serial.begin(115200);
  Serial.setTimeout(500);

  // --- LED test ---
  pinMode(GND_PIN, OUTPUT);
  digitalWrite(GND_PIN, LOW);
  
  for (int i=0; i<NUM_LEDS; i++)
    //leds[i] = CRGB(128,128,128);//half White
    leds[i] = CRGB(128,128,128);//half White
  FastLED.show();
}



unsigned int state;
int32_t lastResponse;
int32_t now;

unsigned int count=0;
unsigned int total=0;


void loop() {
  unsigned char buf[3];
  if (!Serial) {
    while (!Serial) /* wait */ ;
    delay(20);
    Serial.print("Ada\n");
    lastResponse = millis();
    state = 0;
    count = 0;
  }

  now = millis();

  if (state == 0) {
    if (Serial.available() == 0) goto wait;
    state = (Serial.read() == 'A') ? 1 : 0;
    lastResponse = now;

  } else if (state == 1) {
    if (Serial.available() == 0) goto wait;
    state = (Serial.read() == 'd') ? 2 : 0;
    lastResponse = now;

  } else if (state == 2) {
    if (Serial.available() == 0) goto wait;
    state = (Serial.read() == 'a') ? 3 : 0;
    lastResponse = now;

  } else if (state == 3) {
    if (Serial.available() < 3) goto wait;
    Serial.readBytes((char *)buf, 3);
    if ((buf[0] ^ buf[1] ^ 0x55) == buf[2]) {
      count = 0;
      total = buf[0] * 256 + buf[1] + 1;
      state = 4;
    } else if (buf[0] == 'A' && buf[1] == 'd' && buf[2] == 'a') {
      state = 3;
    } else if (buf[1] == 'A' && buf[2] == 'd') {
      state = 2;
    } else if (buf[2] == 'A') {
      state = 1;
    } else {
      state = 0;
    }
    lastResponse = now;

  } else if (state == 4) {
    if (Serial.available() < 3) goto wait;
    Serial.readBytes((char *)buf, 3);
    if (count < NUM_LEDS) {
     //leds.setPixel(count, (buf[0] << 16) | (buf[1] << 8) | buf[2]);
     buf[0] = pgm_read_byte(&gammaR[buf[0]]); 
     buf[1] = pgm_read_byte(&gammaR[buf[1]]); 
     buf[2] = pgm_read_byte(&gammaR[buf[2]]); 
     leds[count] = CRGB(buf[0], buf[1], buf[2]);
    }
    count++;
    if (count >= total) {
      //leds.show();
      FastLED.show();
      state = 0;
    }
    lastResponse = now;
  
  } else {
wait:
    
    if (now - lastResponse > 1000) {
      while (Serial.available()) Serial.read();
      Serial.print("Ada\n");
      state = 0;
      lastResponse = now;
    }
    if (now - lastResponse > 15000) {
      //allColor(0);
      for (int i=0; i<NUM_LEDS; i++)
        leds[i] = CRGB(1,1,1);//black + small light
      FastLED.show();
      lastResponse = now;
    }
    if (now < lastResponse) {now = lastResponse;}
    return;
  }

}

This code is not link any part of SkyLight yet, keep cool.


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