//#include <TimerOne.h>
#include <IRremote.hpp>

// This example creates a PWM signal with 25 kHz carrier.
//
// Arduino's analogWrite() gives you PWM output, but no control over the
// carrier frequency.  The default frequency is low, typically 490 or
// 3920 Hz.  Sometimes you may need a faster carrier frequency.
//
// The specification for 4-wire PWM fans recommends a 25 kHz frequency
// and allows 21 to 28 kHz.  The default from analogWrite() might work
// with some fans, but to follow the specification we need 25 kHz.
//
// http://www.formfactors.org/developer/specs/REV1_2_Public.pdf
//
// Connect the PWM pin to the fan's control wire (usually blue).  The
// board's ground must be connected to the fan's ground, and the fan
// needs +12 volt power from the computer or a separate power supply.
#define CMD_PWR         0xA2
#define PWM_PERIOD     40   // 1/25000Hz = 40us
#define IR_RECEIVE_PIN 4   // Signal Pin of IR receiver
const int PIN_PWM_FAN = 9;
volatile bool wakeup;

ISR(PCINT2_vect) {
    wakeup = true;
}

struct PowerButton {
    uint32_t saveTime;
    bool state;
    bool changed;

} powerButton;

inline void enableWakeupInterruptOnD4() {
    // Enalble PIN CHANGE interrupt on D4 pin
    PCICR |= _BV(PCIE2);
    PCMSK2 |= _BV(PCINT20);  // PIN D4 ha PCINT20, su PCIE2 e PCMSK2
}
inline void disableWakeupInterruptOnD4() {
    // Disable PIN CHANGE interrupt on D4 pin
    PCMSK2 &= ~_BV(PCINT20);
    PCICR &= ~_BV(PCIE2);
}

void setup(void) {
  IrReceiver.begin(IR_RECEIVE_PIN);
  Serial.begin(115200);
  uint16_t c = (F_CPU/100000 * PWM_PERIOD) / 20;
  Serial.println(c);
  toSleep();
  
}

void timer1Init() {
    TCCR1B = _BV(WGM13);    // set mode as phase and frequency correct pwm, stop the timer
	  TCCR1A = 0;             // clear control register A
    ICR1 = (F_CPU/100000 * PWM_PERIOD) / 20;
	  TCCR1B = _BV(WGM13) | _BV(CS10);
    pinMode(PIN_PWM_FAN, OUTPUT); // set pin 9 as output
    TCCR1A |= _BV(COM1A1);
}

void setDutyPercent(uint8_t dc) {
    uint32_t dutyCycle = ICR1 * ((dc / 100.0) * 1023);
	  OCR1A = dutyCycle >> 10;
}

void toSleep() {
    cli(); // clear global interrupt
    enableWakeupInterruptOnD4();
    sei(); // enable global interrupt
    simSleep();
    disableWakeupInterruptOnD4();

}

inline void simSleep() {
    Serial.println("entro nel sonno");
    while (!wakeup);
    wakeup = false;
    Serial.println("esco dal sonno");

}

void loop(void) {
    uint8_t command = 0;
    // Checks received an IR signal
    if (IrReceiver.decode()) {
        command = IrReceiver.decodedIRData.command;
        Serial.println(command);
        IrReceiver.resume();  // Receive the next value
    }
    switch(command) {
      case CMD_PWR:
        powerButton.saveTime = millis();
        break;
    }
  

}