Neopixel primer 3

#define DDR_N (DDRB)
#define PORT_N (PORTB)
#define PIN_N (4)

#define BIT_SET (1 << PIN_N)
#define BIT_CLR (B00000000)

#define PIXELS 16

unsigned char g = 0;
unsigned char r = 0;
unsigned char b = 10;

inline void T1H() { //12
  asm volatile (
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  //"nop \n\t"
  );
}

inline void T1L() { //8
  asm volatile (
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  //"nop \n\t"
  );
}

inline void T0H() { //4
  asm volatile (
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  //"nop \n\t"
  );
}

inline void T0L() { //12
  asm volatile (
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  "nop \n\t"
  //"nop \n\t"
  );
}

inline void sendByte(unsigned char b) {
  for (int bn = 7; bn >= 0; bn--) {
    if (b & 1 << bn) {
      PORT_N = BIT_SET;
      T1H();
      PORT_N = BIT_CLR;
      T1L();
    } else {
      PORT_N = BIT_SET;
      T0H();
      PORT_N = BIT_CLR;
      T0L();
    }
  }
}

void setup() {
  DDR_N = BIT_SET;

  for (int i = 0; i < PIXELS; i++) {
    sendByte(g);
    sendByte(r);
    sendByte(b);
  }
  delayMicroseconds(7);
}

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