#include <avr/interrupt.h>

#include "IRremote.h"
#include "IRremoteInt.h"

//+=============================================================================
// TIMER2 interrupt code to collect raw data.
// Widths of alternating SPACE, MARK are recorded in rawbuf.
// Recorded in ticks of 50 microseconds.
// rawlen counts the number of entries recorded so far.
// First entry is the SPACE between transmissions.
// As soon as a SPACE gets long, ready is set, state switches to IDLE, timing of SPACE continues.
// As soon as first MARK arrives, gap width is recorded, ready is cleared, and new logging starts
//
ISR (TIMER_INTR_NAME)
{
  TIMER_RESET;

  uint8_t irdata = (uint8_t)digitalRead(irparams.recvpin);

  irparams.timer++; // One more 50us tick
  if (irparams.rawlen >= RAWBUF)  irparams.rcvstate = STATE_STOP ;  // Buffer overflow

  switch(irparams.rcvstate) {
    case STATE_IDLE: // In the middle of a gap
      if (irdata == MARK) {
        if (irparams.timer < GAP_TICKS) {
          // Not big enough to be a gap.
          irparams.timer = 0;
        }
        else {
          // gap just ended, record duration and start recording transmission
          irparams.rawlen = 0;
          irparams.rawbuf[irparams.rawlen++] = irparams.timer;
          irparams.timer = 0;
          irparams.rcvstate = STATE_MARK;
        }
      }
      break;

    case STATE_MARK: // timing MARK
      if (irdata == SPACE) {   // MARK ended, record time
        irparams.rawbuf[irparams.rawlen++] = irparams.timer;
        irparams.timer = 0;
        irparams.rcvstate = STATE_SPACE;
      }
      break;

    case STATE_SPACE: // timing SPACE
      if (irdata == MARK) { // SPACE just ended, record it
        irparams.rawbuf[irparams.rawlen++] = irparams.timer;
        irparams.timer = 0;
        irparams.rcvstate = STATE_MARK;
      }
      else { // SPACE
        if (irparams.timer > GAP_TICKS) {
          // big SPACE, indicates gap between codes
          // Mark current code as ready for processing
          // Switch to STOP
          // Don't reset timer; keep counting space width
          irparams.rcvstate = STATE_STOP;
        }
      }
      break;

    case STATE_STOP: // waiting, measuring gap
      if (irdata == MARK)  irparams.timer = 0 ;  // reset gap timer
      break;
  }

  if (irparams.blinkflag) {
    if (irdata == MARK)  BLINKLED_ON() ;   // turn pin 13 LED on
    else                 BLINKLED_OFF() ;  // turn pin 13 LED off
  }
}