/*Digital Pin 2 is on PE4 (OC3B/INT4)*/

#define PIN            2
void setup() {
  // put your setup code here, to run once:


/*define Pin 2/PE4 as output*/
/*Libraries included w/arduino IDE*/
DDRE = 0b00010000;
}

void loop() {
  // put your main code here, to run repeatedly:

while(1){
  //sendPixel(0,0,0,10);
  //sendPixel(0,0,5);
  OneLittleRGBFunc(30);
  delay(1000);
  }
}
/*
 * Good way to see how fast your GPIO really is
void PixHi (void){
  PORTE = 0b00010000;
}
void PixLow (void){
  PORTE = 0x00;
}
*/
void PixZero (void){
  PORTE = 0b00010000;
  //_delay_us(0.25);
  PORTE = 0x00;
   //_delay_us(0.25);
}
void PixOne (void){
  PORTE = 0b00010000;
   //_delay_us(0.55);
   _delay_us(0.55);
  PORTE = 0x00;
}
void PixBit (bool res){

if (res == false){
  PixZero();
}
if (res == true){
  PixOne();
}
  
}

void PixByte (char input){
uint8_t changer = 0;

//WS2812 reads bits as left is lowest (high in first), so go backwards
  for(changer=8;changer>0;changer--){
    PixBit(bitRead(input, changer));
    //input <<= 1; //Atmega didn't like this, so instead, using changer
    //instead of shifting input 
  }
}

void sendPixel(uint8_t g, uint8_t r, uint8_t b){

/*ws2812, reads bits left side as lowest*/
  /*PixByte(0b10100000); //This is dim green
  PixByte(0b00000000);
  PixByte(0b00000000);
  PixByte(0b00000000); //no white on my LED*/
 
  
  PixByte(g);
  PixByte(r);
  PixByte(b);
  //PixByte(w);
  PORTE = 0x00;
  

}

void OneLittleRGBFunc (uint8_t max){
  int rgbfunc = 0;
  for (rgbfunc = 0; rgbfunc < max; rgbfunc++){
    sendPixel(0,10,rgbfunc);
    delay(22);
  }
  for (rgbfunc = max; rgbfunc > 0; rgbfunc--){
    sendPixel(0,10,rgbfunc);
    delay(22);
  }
}