frequencyAC_AVR.ino

/*
  frequencyAC_AVR
  ***************
  
*/

volatile uint32_t count = 0;
volatile uint8_t semiCicle = 0;

void initInputCaptureInterrupt(void){
  TCCR1A = 0; // Timer/Counter1 Control Register A, reset (Normal operation)
  TCCR1B = 0; // Timer/Counter1 Control Register B, reset
              // Not Noise Canceler, Capture Event on falling
  TCCR1B |= (1<<CS11); // Clock Select Bit, prescaler 8 >> 1/2 uS per count
                       // 20.000 counts for 10ms
  TIMSK1 |= (1<<ICIE1); // Timer/Counter1 Interrupt Mask Register
                        // Input Capture Interrupt Enable
  sei(); // Set (global) interrupt enable bit
}


ISR(TIMER1_CAPT_vect){
  count += ICR1; // Input Capture Register 1
  //* resetear contador
  GTCCR |= (1<<TSM)|(1<<PSRSYNC); // halt timer1 and 0
    TCNT1 = 0;    // Timer/Counter1
  GTCCR = 0; // release all timers

  //* activar flag de nuevo dato
  semiCicle++;
  
}

void setup(){
  Serial.begin(9600);
  initInputCaptureInterrupt();
}

void loop(){
  if(semiCicle>99){
    Serial.println(count); 
    count=0;
    semiCicle = 0;
  }//Data sent every 1s, 250 samples per second
}