File content as of revision 7:c82a0d54a024:

//******************************************************************************
// IRremote
// Version 2.0.1 June, 2015
// Copyright 2009 Ken Shirriff
// For details, see http://arcfn.com/2009/08/multi-protocol-infrared-remote-library.html
//
// Modified by Paul Stoffregen <paul@pjrc.com> to support other boards and timers
// Modified  by Mitra Ardron <mitra@mitra.biz>
// Added Sanyo and Mitsubishi controllers
// Modified Sony to spot the repeat codes that some Sony's send
//
// Interrupt code based on NECIRrcv by Joe Knapp
// http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1210243556
// Also influenced by http://zovirl.com/2008/11/12/building-a-universal-remote-with-an-arduino/
//
// JVC and Panasonic protocol added by Kristian Lauszus (Thanks to zenwheel and other people at the original blog post)
// LG added by Darryl Smith (based on the JVC protocol)
// Whynter A/C ARC-110WD added by Francesco Meschia
//******************************************************************************

// Defining IR_GLOBAL here allows us to declare the instantiation of global variables
#define IR_GLOBAL
#	include "IRremote.h"
#	include "IRremoteInt.h"
#undef IR_GLOBAL

//+=============================================================================
// The match functions were (apparently) originally MACROs to improve code speed
//   (although this would have bloated the code) hence the names being CAPS
// A later release implemented debug output and so they needed to be converted
//   to functions.
// I tried to implement a dual-compile mode (DEBUG/non-DEBUG) but for some
//   reason, no matter what I did I could not get them to function as macros again.
// I have found a *lot* of bugs in the Arduino compiler over the last few weeks,
//   and I am currently assuming that one of these bugs is my problem.
// I may revisit this code at a later date and look at the assembler produced
//   in a hope of finding out what is going on, but for now they will remain as
//   functions even in non-DEBUG mode
//
int  MATCH (int measured,  int desired)
{
 	DBG_PRINT("Testing: ");
 	DBG_PRINT(TICKS_LOW(desired), DEC);
 	DBG_PRINT(" <= ");
 	DBG_PRINT(measured, DEC);
 	DBG_PRINT(" <= ");
 	DBG_PRINTLN(TICKS_HIGH(desired), DEC);

 	return ((measured >= TICKS_LOW(desired)) && (measured <= TICKS_HIGH(desired)));
}

//+========================================================
// Due to sensor lag, when received, Marks tend to be 100us too long
//
int  MATCH_MARK (int measured_ticks,  int desired_us)
{
	DBG_PRINT("Testing mark ");
	DBG_PRINT(measured_ticks * USECPERTICK, DEC);
	DBG_PRINT(" vs ");
	DBG_PRINT(desired_us, DEC);
	DBG_PRINT(": ");
	DBG_PRINT(TICKS_LOW(desired_us + MARK_EXCESS), DEC);
	DBG_PRINT(" <= ");
	DBG_PRINT(measured_ticks, DEC);
	DBG_PRINT(" <= ");
	DBG_PRINTLN(TICKS_HIGH(desired_us + MARK_EXCESS), DEC);

	return ((measured_ticks >= TICKS_LOW (desired_us + MARK_EXCESS))
	     && (measured_ticks <= TICKS_HIGH(desired_us + MARK_EXCESS)));
}

//+========================================================
// Due to sensor lag, when received, Spaces tend to be 100us too short
//
int  MATCH_SPACE (int measured_ticks,  int desired_us)
{
	DBG_PRINT("Testing space ");
	DBG_PRINT(measured_ticks * USECPERTICK, DEC);
	DBG_PRINT(" vs ");
	DBG_PRINT(desired_us, DEC);
	DBG_PRINT(": ");
	DBG_PRINT(TICKS_LOW(desired_us - MARK_EXCESS), DEC);
	DBG_PRINT(" <= ");
	DBG_PRINT(measured_ticks, DEC);
	DBG_PRINT(" <= ");
	DBG_PRINTLN(TICKS_HIGH(desired_us - MARK_EXCESS), DEC);

	return ((measured_ticks >= TICKS_LOW (desired_us - MARK_EXCESS))
	     && (measured_ticks <= TICKS_HIGH(desired_us - MARK_EXCESS)));
}

//+=============================================================================
// Interrupt Service Routine - Fires every 50uS
// TIMER2 interrupt code to collect raw data.
// Widths of alternating SPACE, MARK are recorded in rawbuf.
// Recorded in ticks of 50uS [microseconds, 0.000050 seconds]
// 'rawlen' counts the number of entries recorded so far.
// First entry is the SPACE between transmissions.
// As soon as a the first [SPACE] entry 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; New logging starts
//
void IRrecv::timer_isr ()
{
	// Read if IR Receiver -> SPACE [xmt LED off] or a MARK [xmt LED on]
	// digitalRead() is very slow. Optimisation is possible, but makes the code unportable
	uint8_t  irdata = _recvpin.read();

	irparams.timer++;  // One more 50uS tick
	if (irparams.rawlen >= RAWBUF)  irparams.rcvstate = STATE_OVERFLOW ;  // 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; Start recording transmission
					irparams.overflow                  = false;
					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 time
				irparams.rawbuf[irparams.rawlen++] = irparams.timer;
				irparams.timer                     = 0;
				irparams.rcvstate                  = STATE_MARK;

			} else if (irparams.timer > GAP_TICKS) {  // Space
					// A long Space, indicates gap between codes
					// Flag the 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;
		//......................................................................
		case STATE_OVERFLOW:  // Flag up a read overflow; Stop the State Machine
			irparams.overflow = true;
			irparams.rcvstate = STATE_STOP;
		 	break;
	}
}