#else // Arduino Due

  #define SCALE      VARIANT_MCK / 2UL / 1000000UL
  #define INST       (2UL * F_CPU / VARIANT_MCK)
  #define TIME_800_0 ((int)(0.40 * SCALE + 0.5) - (5 * INST))
  #define TIME_800_1 ((int)(0.80 * SCALE + 0.5) - (5 * INST))
  #define PERIOD_800 ((int)(1.25 * SCALE + 0.5) - (5 * INST))
  #define TIME_400_0 ((int)(0.50 * SCALE + 0.5) - (5 * INST))
  #define TIME_400_1 ((int)(1.20 * SCALE + 0.5) - (5 * INST))
  #define PERIOD_400 ((int)(2.50 * SCALE + 0.5) - (5 * INST))

  int             pinMask, time0, time1, period, t;
  Pio            *port;
  volatile WoReg *portSet, *portClear, *timeValue, *timeReset;
  uint8_t        *p, *end, pix, mask;

  pmc_set_writeprotect(false);
  pmc_enable_periph_clk((uint32_t)TC3_IRQn);
  TC_Configure(TC1, 0,
    TC_CMR_WAVE | TC_CMR_WAVSEL_UP | TC_CMR_TCCLKS_TIMER_CLOCK1);
  TC_Start(TC1, 0);

  pinMask   = g_APinDescription[pin].ulPin; // Don't 'optimize' these into
  port      = g_APinDescription[pin].pPort; // declarations above.  Want to
  portSet   = &(port->PIO_SODR);            // burn a few cycles after
  portClear = &(port->PIO_CODR);            // starting timer to minimize
  timeValue = &(TC1->TC_CHANNEL[0].TC_CV);  // the initial 'while'.
  timeReset = &(TC1->TC_CHANNEL[0].TC_CCR);
  p         =  pixels;
  end       =  p + numBytes;
  pix       = *p++;
  mask      = 0x80;

#ifdef NEO_KHZ400
  if((type & NEO_SPDMASK) == NEO_KHZ800) { // 800 KHz bitstream
#endif
    time0 = TIME_800_0;
    time1 = TIME_800_1;
    period = PERIOD_800;
#ifdef NEO_KHZ400
  } else { // 400 KHz bitstream
    time0 = TIME_400_0;
    time1 = TIME_400_1;
    period = PERIOD_400;
  }
#endif

  for(t = time0;; t = time0) {
    if(pix & mask) t = time1;
    while(*timeValue < period);
    *portSet   = pinMask;
    *timeReset = TC_CCR_CLKEN | TC_CCR_SWTRG;
    while(*timeValue < t);
    *portClear = pinMask;
    if(!(mask >>= 1)) {   // This 'inside-out' loop logic utilizes
      if(p >= end) break; // idle time to minimize inter-byte delays.
      pix = *p++;
      mask = 0x80;
    }
  }
  while(*timeValue < period); // Wait for last bit
  TC_Stop(TC1, 0);

#endif // end Arduino Due