code prismarl

codeprismark.ino

/*
 * Arduino interface for the use of WS2812 strip LEDs
 * Uses Adalight protocol and is compatible with Boblight, Prismatik etc...
 * "Magic Word" for synchronisation is 'Ada' followed by LED High, Low and Checksum
 * @author: Wifsimster <wifsimster@gmail.com> 
 * @library: FastLED v3.001
 * @date: 11/22/2015
 */
#include "FastLED.h"
#define NUM_LEDS 240
#define DATA_PIN 6

// Baudrate, higher rate allows faster refresh rate and more LEDs (defined in /etc/boblight.conf)
#define serialRate 115200

// Adalight sends a "Magic Word" (defined in /etc/boblight.conf) before sending the pixel data
uint8_t prefix[] = {'A', 'd', 'a'};

// Initialise LED-array
CRGB leds[NUM_LEDS];

void setup() {
  // Use NEOPIXEL to keep true colors
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
  
  // Initial RGB flash
  LEDS.showColor(CRGB(255, 0, 0));
  delay(500);
  LEDS.showColor(CRGB(0, 255, 0));
  delay(500);
  LEDS.showColor(CRGB(0, 0, 255));
  delay(500);
  LEDS.showColor(CRGB(0, 0, 0));
  
  Serial.begin(serialRate);
  // Send "Magic Word" string to host
  Serial.print("Ada\n");
}


uint8_t readCharFromSerial()
{
  while (!Serial.available()) ; //not sure you need it for each call 
  return Serial.read();
}


void waitForLMagicWord(uint8_t *magicWord)
{
  bool finished = false;
  int i=0;
  while (!finished)
  {
    if(magicWord[i]==readCharFromSerial())
      {
        i++;
        if(i==sizeof(magicWord)/sizeof(magicWord[0])) //indeed /sizeof(magicWord[0]) not necessary but to be cleaner :)
        {
          finished=true;
        }
        
      }
      else
      {
        i=0;
      }
    
  }
}
void loop() { 
  // Wait for first byte of Magic Word
 waitForLMagicWord(prefix);
  
  // Hi, Lo, Checksum  
  
 uint8_t  hi=readCharFromSerial();
 uint8_t  lo=readCharFromSerial();
 uint8_t  chk=readCharFromSerial();
  
  // If checksum does not match go back to wait
  if (chk == (hi ^ lo ^ 0x55)) {
  //as you rewrite every leds this should not be necessary
   // memset(leds, 0, NUM_LEDS * sizeof(struct CRGB));
  // Read the transmission data and set LED values
  for (int i = 0; i < NUM_LEDS; i++) { //int because of the issue of more than 255 leds
    byte r, g, b;    
    
    r = readCharFromSerial();
    g = readCharFromSerial();
    b = readCharFromSerial();
    leds[i].r = r;
    leds[i].g = g;
    leds[i].b = b;
  }
  
  // Shows new values
    FastLED.show();
   
  }
  
  
}