mirror of
https://github.com/Theaninova/Arduino-IRremote.git
synced 2025-12-13 01:46:21 +00:00
67 lines
2.6 KiB
C++
67 lines
2.6 KiB
C++
#include "IRremote.h"
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#include "IRremoteInt.h"
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//+=============================================================================
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void IRsend::sendRaw (unsigned int buf[], unsigned char len, unsigned char hz)
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{
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// Set IR carrier frequency
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enableIROut(hz);
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for (unsigned char i = 0; i < len; i++) {
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if (i & 1) space(buf[i]) ;
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else mark (buf[i]) ;
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}
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space(0); // Always end with the LED off
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}
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//+=============================================================================
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// Sends an IR mark for the specified number of microseconds.
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// The mark output is modulated at the PWM frequency.
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//
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void IRsend::mark (int time)
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{
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TIMER_ENABLE_PWM; // Enable pin 3 PWM output
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if (time > 0) delayMicroseconds(time);
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}
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//+=============================================================================
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// Leave pin off for time (given in microseconds)
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// Sends an IR space for the specified number of microseconds.
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// A space is no output, so the PWM output is disabled.
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//
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void IRsend::space (int time)
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{
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TIMER_DISABLE_PWM; // Disable pin 3 PWM output
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if (time > 0) delayMicroseconds(time);
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}
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//+=============================================================================
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// Enables IR output. The khz value controls the modulation frequency in kilohertz.
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// The IR output will be on pin 3 (OC2B).
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// This routine is designed for 36-40KHz; if you use it for other values, it's up to you
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// to make sure it gives reasonable results. (Watch out for overflow / underflow / rounding.)
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// TIMER2 is used in phase-correct PWM mode, with OCR2A controlling the frequency and OCR2B
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// controlling the duty cycle.
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// There is no prescaling, so the output frequency is 16MHz / (2 * OCR2A)
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// To turn the output on and off, we leave the PWM running, but connect and disconnect the output pin.
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// A few hours staring at the ATmega documentation and this will all make sense.
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// See my Secrets of Arduino PWM at http://arcfn.com/2009/07/secrets-of-arduino-pwm.html for details.
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//
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void IRsend::enableIROut (int khz)
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{
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// Disable the Timer2 Interrupt (which is used for receiving IR)
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TIMER_DISABLE_INTR; //Timer2 Overflow Interrupt
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pinMode(TIMER_PWM_PIN, OUTPUT);
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digitalWrite(TIMER_PWM_PIN, LOW); // When not sending PWM, we want it low
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// COM2A = 00: disconnect OC2A
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// COM2B = 00: disconnect OC2B; to send signal set to 10: OC2B non-inverted
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// WGM2 = 101: phase-correct PWM with OCRA as top
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// CS2 = 000: no prescaling
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// The top value for the timer. The modulation frequency will be SYSCLOCK / 2 / OCR2A.
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TIMER_CONFIG_KHZ(khz);
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}
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