mirror of
https://github.com/Theaninova/Arduino-IRremote.git
synced 2025-12-11 08:56:14 +00:00
7925fcd36b
parameters changed from int to unsigned int to allow longer mark/space durations and signal length.hz changed to allow for potential future use of 455kHz carrier frequency. (Ther may be existing modes to the library, using this frequency) removed "asm" workaround for compiler, because it was not need ed on my system. Original autor should verify this again. It could be alternatice compiler optimization settings? Alternatively, place the volatile keyword before the variables in the function to avoid the "optimization out"
88 lines
3.1 KiB
C++
88 lines
3.1 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 int len, unsigned int 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 int 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 (unsigned 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) custom_delay_usec(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 (unsigned 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) IRsend::custom_delay_usec(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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//+=============================================================================
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// Custom delay function that circumvents Arduino's delayMicroseconds limit
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void IRsend::custom_delay_usec(unsigned long uSecs) {
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if (uSecs > 4) {
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unsigned long start = micros();
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unsigned long endMicros = start + uSecs - 4;
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if (endMicros < start) { // Check if overflow
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while ( micros() > start ) {} // wait until overflow
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}
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while ( micros() < endMicros ) {} // normal wait
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}
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//else {
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// __asm__("nop\n\t"); // must have or compiler optimizes out
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//}
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}
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