Diff: irRecv.cpp

Revision:

0:70c8e56bac45

Child:

3:17440cf7ab90

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/irRecv.cpp	Sat Jan 23 06:16:48 2016 +0000
@@ -0,0 +1,213 @@
+#include "IRremote.h"
+#include "IRremoteInt.h"
+
+//+=============================================================================
+// Decodes the received IR message
+// Returns 0 if no data ready, 1 if data ready.
+// Results of decoding are stored in results
+//
+int  IRrecv::decode (decode_results *results)
+{
+	results->rawbuf   = irparams.rawbuf;
+	results->rawlen   = irparams.rawlen;
+
+	results->overflow = irparams.overflow;
+
+	if (irparams.rcvstate != STATE_STOP)  return false ;
+
+#if DECODE_NEC
+	DBG_PRINTLN("Attempting NEC decode");
+	if (decodeNEC(results))  return true ;
+#endif
+
+#if DECODE_SONY
+	DBG_PRINTLN("Attempting Sony decode");
+	if (decodeSony(results))  return true ;
+#endif
+
+#if DECODE_SANYO
+	DBG_PRINTLN("Attempting Sanyo decode");
+	if (decodeSanyo(results))  return true ;
+#endif
+
+#if DECODE_MITSUBISHI
+	DBG_PRINTLN("Attempting Mitsubishi decode");
+	if (decodeMitsubishi(results))  return true ;
+#endif
+
+#if DECODE_RC5
+	DBG_PRINTLN("Attempting RC5 decode");
+	if (decodeRC5(results))  return true ;
+#endif
+
+#if DECODE_RC6
+	DBG_PRINTLN("Attempting RC6 decode");
+	if (decodeRC6(results))  return true ;
+#endif
+
+#if DECODE_PANASONIC
+	DBG_PRINTLN("Attempting Panasonic decode");
+	if (decodePanasonic(results))  return true ;
+#endif
+
+#if DECODE_LG
+	DBG_PRINTLN("Attempting LG decode");
+	if (decodeLG(results))  return true ;
+#endif
+
+#if DECODE_JVC
+	DBG_PRINTLN("Attempting JVC decode");
+	if (decodeJVC(results))  return true ;
+#endif
+
+#if DECODE_SAMSUNG
+	DBG_PRINTLN("Attempting SAMSUNG decode");
+	if (decodeSAMSUNG(results))  return true ;
+#endif
+
+#if DECODE_WHYNTER
+	DBG_PRINTLN("Attempting Whynter decode");
+	if (decodeWhynter(results))  return true ;
+#endif
+
+#if DECODE_AIWA_RC_T501
+	DBG_PRINTLN("Attempting Aiwa RC-T501 decode");
+	if (decodeAiwaRCT501(results))  return true ;
+#endif
+
+#if DECODE_DENON
+	DBG_PRINTLN("Attempting Denon decode");
+	if (decodeDenon(results))  return true ;
+#endif
+
+	// decodeHash returns a hash on any input.
+	// Thus, it needs to be last in the list.
+	// If you add any decodes, add them before this.
+	if (decodeHash(results))  return true ;
+
+	// Throw away and start over
+	resume();
+	return false;
+}
+
+//+=============================================================================
+IRrecv::IRrecv (int recvpin)
+{
+	irparams.recvpin = recvpin;
+	irparams.blinkflag = 0;
+}
+
+IRrecv::IRrecv (int recvpin, int blinkpin)
+{
+	irparams.recvpin = recvpin;
+	irparams.blinkpin = blinkpin;
+	pinMode(blinkpin, OUTPUT);
+	irparams.blinkflag = 0;
+}
+
+
+
+//+=============================================================================
+// initialization
+//
+void  IRrecv::enableIRIn ( )
+{
+	cli();
+	// Setup pulse clock timer interrupt
+	// Prescale /8 (16M/8 = 0.5 microseconds per tick)
+	// Therefore, the timer interval can range from 0.5 to 128 microseconds
+	// Depending on the reset value (255 to 0)
+	TIMER_CONFIG_NORMAL();
+
+	// Timer2 Overflow Interrupt Enable
+	TIMER_ENABLE_INTR;
+
+	TIMER_RESET;
+
+	sei();  // enable interrupts
+
+	// Initialize state machine variables
+	irparams.rcvstate = STATE_IDLE;
+	irparams.rawlen = 0;
+
+	// Set pin modes
+	pinMode(irparams.recvpin, INPUT);
+}
+
+//+=============================================================================
+// Enable/disable blinking of pin 13 on IR processing
+//
+void  IRrecv::blink13 (int blinkflag)
+{
+	irparams.blinkflag = blinkflag;
+	if (blinkflag)  pinMode(BLINKLED, OUTPUT) ;
+}
+
+//+=============================================================================
+// Return if receiving new IR signals
+// 
+bool  IRrecv::isIdle ( ) 
+{
+ return (irparams.rcvstate == STATE_IDLE || irparams.rcvstate == STATE_STOP) ? true : false;
+}
+//+=============================================================================
+// Restart the ISR state machine
+//
+void  IRrecv::resume ( )
+{
+	irparams.rcvstate = STATE_IDLE;
+	irparams.rawlen = 0;
+}
+
+//+=============================================================================
+// hashdecode - decode an arbitrary IR code.
+// Instead of decoding using a standard encoding scheme
+// (e.g. Sony, NEC, RC5), the code is hashed to a 32-bit value.
+//
+// The algorithm: look at the sequence of MARK signals, and see if each one
+// is shorter (0), the same length (1), or longer (2) than the previous.
+// Do the same with the SPACE signals.  Hash the resulting sequence of 0's,
+// 1's, and 2's to a 32-bit value.  This will give a unique value for each
+// different code (probably), for most code systems.
+//
+// http://arcfn.com/2010/01/using-arbitrary-remotes-with-arduino.html
+//
+// Compare two tick values, returning 0 if newval is shorter,
+// 1 if newval is equal, and 2 if newval is longer
+// Use a tolerance of 20%
+//
+int  IRrecv::compare (unsigned int oldval,  unsigned int newval)
+{
+	if      (newval < oldval * .8)  return 0 ;
+	else if (oldval < newval * .8)  return 2 ;
+	else                            return 1 ;
+}
+
+//+=============================================================================
+// Use FNV hash algorithm: http://isthe.com/chongo/tech/comp/fnv/#FNV-param
+// Converts the raw code values into a 32-bit hash code.
+// Hopefully this code is unique for each button.
+// This isn't a "real" decoding, just an arbitrary value.
+//
+#define FNV_PRIME_32 16777619
+#define FNV_BASIS_32 2166136261
+
+long  IRrecv::decodeHash (decode_results *results)
+{
+	long  hash = FNV_BASIS_32;
+
+	// Require at least 6 samples to prevent triggering on noise
+	if (results->rawlen < 6)  return false ;
+
+	for (int i = 1;  (i + 2) < results->rawlen;  i++) {
+		int value =  compare(results->rawbuf[i], results->rawbuf[i+2]);
+		// Add value into the hash
+		hash = (hash * FNV_PRIME_32) ^ value;
+	}
+
+	results->value       = hash;
+	results->bits        = 32;
+	results->decode_type = UNKNOWN;
+
+	return true;
+}