/* Modified 25.10.2011 mstr
 * IRremote  Version 0.1 July, 2009 Copyright 2009 Ken Shirriff
 * For details, see http://arcfn.com/2009/08/multi-protocol-infrared-remote-library.html
 *
 * 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/
 */

#ifndef IRremoteint_h
#define IRremoteint_h

#include <WProgram.h>

#define CLKFUDGE 5      // fudge factor for clock interrupt overhead
#define CLK 256      // max value for clock (timer 2)
#define PRESCALE 8      // timer2 clock prescale
#define SYSCLOCK 16000000  // main Arduino clock
#define CLKSPERUSEC (SYSCLOCK/PRESCALE/1000000)   // timer clocks per microsecond

#define ERR 0
#define DECODED 1

#define BLINKLED 13

// defines for setting and clearing register bits
#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif
#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif

// clock timer reset value
#define INIT_TIMER_COUNT2 (CLK - USECPERTICK*CLKSPERUSEC + CLKFUDGE)
#define RESET_TIMER2 TCNT2 = INIT_TIMER_COUNT2

// pulse width in usec
#define TOSSU_HDR_MARK		4500
#define TOSSU_HDR_SPACE0	4500
#define TOSSU_HDR_SPACE1	8000
#define TOSSU_BIT_MARK		 550
#define TOSSU_ONE_SPACE		1650
#define TOSSU_ZERO_SPACE	 550
#define TOSSU_RPT_SPACE		2250

#define TOLERANCE 25  // percent tolerance in measurements
#define LTOL (1.0 - TOLERANCE/100.) 
#define UTOL (1.0 + TOLERANCE/100.) 

#define _GAP 5000 // Minimum map between transmissions
#define GAP_TICKS (_GAP/USECPERTICK)

#define TICKS_LOW(us) (int) (((us)*LTOL/USECPERTICK))
#define TICKS_HIGH(us) (int) (((us)*UTOL/USECPERTICK + 1))

#ifndef DEBUG
#define MATCH(measured_ticks, desired_us) ((measured_ticks) >= TICKS_LOW(desired_us) && (measured_ticks) <= TICKS_HIGH(desired_us))
#define MATCH_MARK(measured_ticks, desired_us) MATCH(measured_ticks, (desired_us) + MARK_EXCESS)
#define MATCH_SPACE(measured_ticks, desired_us) MATCH((measured_ticks), (desired_us) - MARK_EXCESS)
// Debugging versions are in IRremote.cpp
#endif

// receiver states
#define STATE_IDLE     2
#define STATE_MARK     3
#define STATE_SPACE    4
#define STATE_STOP     5

// information for the interrupt handler
typedef struct {
  uint8_t recvpin;           // pin for IR data from detector
  uint8_t rcvstate;          // state machine
  uint8_t blinkflag;         // TRUE to enable blinking of pin 13 on IR processing
  unsigned int timer;     // state timer, counts 50uS ticks.
  unsigned int rawbuf[RAWBUF]; // raw data
  uint8_t rawlen;         // counter of entries in rawbuf
} 
irparams_t;

// Defined in IRremote.cpp
extern volatile irparams_t irparams;

// IR detector output is active low
#define MARK  0
#define SPACE 1

#define TOPBIT 0x80

#define TOSSU_BITS 8

#endif