/*
*/


#define PWM_CT2A   11 //OC2A
#define PWM_CT2B    3 //OC2B

#define maxpwm 127

void ct2_init()
{
  pinMode(PWM_CT2A, OUTPUT);
  pinMode(PWM_CT2B, OUTPUT);

  TCCR2A = (1 << COM2B1) |(1 << COM2B0) | (1 << COM2A1) | (1 << WGM20);  //fast PWM
  TCCR2B = (1 << CS20);      // prescaler 0
  OCR2A = 0;                               
  OCR2B = 255;               // pwm value  
}


void setup() 
{
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(115200);

  ct2_init();
}

void setct(uint8_t data)
{
  uint8_t ld = constrain(data,0,maxpwm);
  OCR2A = ld;                               // TOP overflow value (Hz)
  OCR2B = 255-ld;                           // pwm value  
  
}

uint8_t ct,i;
uint8_t power = 1;

uint8_t sintab[10] ={0,10,30,40,45,40,30,10,0};

void loop() 
{ 
  for (i=0;i<10;i++) 
  {
    delay(1);
    ct = power * sintab[i];
    setct(ct);
  }
}