Neopixel primer 2

#define PIXEL_PORT  PORTB
#define PIXEL_DDR   DDRB
#define PIXEL_BIT   4

#define PIXEL_COUNT 16


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

inline void sendByte(unsigned char b) {
  for (int i = 7; i >= 0; i--) {
    if (b & 1 << i) { // bit = 1
      asm volatile (
      "sbi %[port], %[bit] \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"
      "nop \n\t"
      "cbi %[port], %[bit] \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"
      ::
      [port] "I" (_SFR_IO_ADDR(PIXEL_PORT)),
      [bit] "I" (PIXEL_BIT)
      );
    } else { // bit = 0
      asm volatile (
      "sbi %[port], %[bit] \n\t"
      "nop \n\t"
      "nop \n\t"
      "nop \n\t"
      "nop \n\t"
      "cbi %[port], %[bit] \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"
      "nop \n\t"
      ::
      [port] "I" (_SFR_IO_ADDR(PIXEL_PORT)),
      [bit] "I" (PIXEL_BIT)
      );
    }
  }
}

void setup() {
    bitSet(PIXEL_DDR , PIXEL_BIT);
    delay(1);

    cli(); //disable interrupts
    for(int j = 0; j < PIXEL_COUNT; j++) {
      //NOTE: colors - G-R-B
      sendByte(g);
      sendByte(r);
      sendByte(b);
    }
    sei(); //enable interrupts
    delayMicroseconds(7);
}

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