Arduino红外发射的调频定时器设置
//+=============================================================================
// 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
//
ISR (TIMER_INTR_NAME)
{
TIMER_RESET;
// 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 = (uint8_t)digitalRead(irparams.recvpin);
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;
}
#ifdef BLINKLED
// If requested, flash LED while receiving IR data
if (irparams.blinkflag) {
if (irdata == MARK)
if (irparams.blinkpin) digitalWrite(irparams.blinkpin, HIGH); // Turn user defined pin LED on
else BLINKLED_ON() ; // if no user defined LED pin, turn default LED pin for the hardware on
else if (irparams.blinkpin) digitalWrite(irparams.blinkpin, LOW); // Turn user defined pin LED on
else BLINKLED_OFF() ; // if no user defined LED pin, turn default LED pin for the hardware on
}
#endif // BLINKLED
}
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