/*
 * IR 2 I2C
 * Since IR decoding can sometimes take too much time, I decided to implement
 * a decoder on an ATtiny85. It acts as an I2C slave.
 */
#include <Arduino.h>
/*
 * We need to remove some all send functions, and some protocols to save space.
 */
#include <tiny_IRremote.h>
#include <TinyWireS.h>
#include <avr/wdt.h>
#include <avr/io.h>
#include <avr/interrupt.h>


#define I2C_ADDR        0x20

//REGISTER
#define I2C_SEND_IR     0x01
#define I2C_REG_RESET   0x05


#define PIN_INT         4

IRsend irsend;

volatile boolean shoot = false;
volatile uint8_t code;



volatile uint8_t reg, opt;


void receiveEvent(uint8_t howMany)
{
    if(howMany < 1)
        return;

    /* First byte is the register */
    reg = TinyWireS.receive();

    /* If there is an option, receive it */
    if(TinyWireS.available())
        opt = TinyWireS.receive();
    else
        opt = 0;

    /* And we ignore the rest */
    while(TinyWireS.available())
        (void) TinyWireS.receive();

    if(reg == I2C_REG_RESET) {
        /* Wait for watchdog to reset us */
        wdt_enable(WDTO_15MS);
        while(1) ;
    }    

    if(reg == I2C_SEND_IR) {

      shoot = true;
      code = opt;
    }
}



void setup() {
   pinMode(4, OUTPUT);
   TinyWireS.begin(I2C_ADDR);
   TinyWireS.onReceive(receiveEvent);
}

void loop() {
  // put your main code here, to run repeatedly:
  TinyWireS_stop_check();
  if(shoot) {
     irsend.sendNEC(code, 32);
     shoot = false;
  }
}