// --- AVR128DB64 ---
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/atomic.h>

void initPins (void);
void initTCA0 (void);
void deleteTCA0 (void);

int main (void)
{
  deleteTCA0();
  initPins();
  initTCA0();

  while(1)
  {   }
}

void initPins (void)
{  
  PORTMUX.TCAROUTEA = PORTMUX_TCA0_PORTB_gc;  // TCA0 WO-x umrouten
  VPORTB.DIR = VPORTB.DIR | _BV(0);           // PB0 / TCA0-WO Output 
}

void initTCA0 (void)
{
  const uint16_t value = 65535;
  TCA0.SINGLE.CMP0BUF = value;                                            // TOP
  TCA0.SINGLE.CTRLA = TCA_SINGLE_CLKSEL_DIV1_gc;                          // CLK_PER divider
  TCA0.SINGLE.CTRLB = TCA_SINGLE_WGMODE_FRQ_gc | TCA_SINGLE_CMP0EN_bm;    // Frequency Generation Mode
  TCA0.SINGLE.CTRLA = TCA0.SINGLE.CTRLA | TCA_SINGLE_ENABLE_bm;           // Enable TCA
}

void deleteTCA0 (void)
{
  TCA0.SINGLE.CTRLA = 0;
  TCA0.SINGLE.CTRLB = 0;
  TCA0.SINGLE.CTRLC = 0;
  TCA0.SINGLE.CTRLD = 0;
  TCA0.SINGLE.INTCTRL = 0;
  TCA0.SINGLE.CNT = 0;
}