127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/*
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* tiny_IRremote
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* Version 0.2 July, 2016
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* Christian D'Abrera
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* Fixed what was originally rather broken code from http://www.gammon.com.au/Arduino/
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* ...itself based on work by Ken Shirriff.
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*
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* This code was tested for both sending and receiving IR on an ATtiny85 DIP-8 chip.
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* IMPORTANT: IRsend only works from PB4 ("pin 4" according to Arduino). You will need to
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* determine which physical pin this corresponds to for your chip, and connect your transmitter
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* LED there.
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*
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* Copyright 2009 Ken Shirriff
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* For details, see http://arcfn.com/2009/08/multi-protocol-infrared-remote-library.html
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*
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* Interrupt code based on NECIRrcv by Joe Knapp
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* http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1210243556
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* Also influenced by http://zovirl.com/2008/11/12/building-a-universal-remote-with-an-arduino/
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*/
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#ifndef tiny_IRremoteint_h
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#define tiny_IRremoteint_h
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#include <Arduino.h>
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#define CLKFUDGE 5 // fudge factor for clock interrupt overhead
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#define CLK 256 // max value for clock (timer 2)
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#define PRESCALE 4 // TIMER1 clock prescale
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#if defined (F_CPU)
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#define SYSCLOCK F_CPU // main Arduino clock
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#else
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#define SYSCLOCK 8000000 // default ATtiny clock
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#endif
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#define CLKSPERUSEC (SYSCLOCK/PRESCALE/1000000) // timer clocks per microsecond
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#define ERR 0
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#define DECODED 1
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// defines for setting and clearing register bits
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#ifndef cbi
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#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
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#endif
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#ifndef sbi
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#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
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#endif
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// clock timer reset value
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#define INIT_TIMER_COUNT1 (CLK - USECPERTICK*CLKSPERUSEC + CLKFUDGE)
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#define RESET_TIMER1 TCNT1 = INIT_TIMER_COUNT1
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// pulse parameters in usec
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#define NEC_HDR_MARK 9000
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#define NEC_HDR_SPACE 4500
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#define NEC_BIT_MARK 560
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#define NEC_ONE_SPACE 1600
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#define NEC_ZERO_SPACE 560
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#define NEC_RPT_SPACE 2250
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#define SONY_HDR_MARK 2400
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#define SONY_HDR_SPACE 600
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#define SONY_ONE_MARK 1200
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#define SONY_ZERO_MARK 600
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#define SONY_RPT_LENGTH 45000
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#define RC5_T1 889
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#define RC5_RPT_LENGTH 46000
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#define RC6_HDR_MARK 2666
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#define RC6_HDR_SPACE 889
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#define RC6_T1 444
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#define RC6_RPT_LENGTH 46000
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#define TOLERANCE 25 // percent tolerance in measurements
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#define LTOL (1.0 - TOLERANCE/100.)
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#define UTOL (1.0 + TOLERANCE/100.)
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#define _GAP 5000 // Minimum map between transmissions
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#define GAP_TICKS (_GAP/USECPERTICK)
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#define TICKS_LOW(us) (int) (((us)*LTOL/USECPERTICK))
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#define TICKS_HIGH(us) (int) (((us)*UTOL/USECPERTICK + 1))
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#ifndef DEBUG
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#define MATCH(measured_ticks, desired_us) ((measured_ticks) >= TICKS_LOW(desired_us) && (measured_ticks) <= TICKS_HIGH(desired_us))
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#define MATCH_MARK(measured_ticks, desired_us) MATCH(measured_ticks, (desired_us) + MARK_EXCESS)
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#define MATCH_SPACE(measured_ticks, desired_us) MATCH((measured_ticks), (desired_us) - MARK_EXCESS)
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// Debugging versions are in tiny_IRremote.cpp
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#endif
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// receiver states
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#define STATE_IDLE 2
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#define STATE_MARK 3
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#define STATE_SPACE 4
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#define STATE_STOP 5
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// information for the interrupt handler
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typedef struct {
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uint8_t recvpin; // pin for IR data from detector
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uint8_t rcvstate; // state machine
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unsigned int timer; // state timer, counts 50uS ticks.
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unsigned int rawbuf[RAWBUF]; // raw data
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uint8_t rawlen; // counter of entries in rawbuf
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}
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irparams_t;
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// Defined in tiny_IRremote.cpp
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extern volatile irparams_t irparams;
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// IR detector output is active low
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#define MARK 0
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#define SPACE 1
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#define TOPBIT 0x80000000
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#define NEC_BITS 32
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#define SONY_BITS 12
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#define MIN_RC5_SAMPLES 11
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#define MIN_RC6_SAMPLES 1
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#endif
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