Method customDelayMicroseconds

src/IRSend.hpp:1466–1490

* Custom delay function that circumvents Arduino's delayMicroseconds 16 bit limit * and is (mostly) not extended by the duration of interrupt codes like the millis() interrupt */

 * and is (mostly) not extended by the duration of interrupt codes like the millis() interrupt
 */
void IRsend::customDelayMicroseconds(unsigned long aMicroseconds) {
#if defined(ESP32) || defined(ESP8266)
    // from https://github.com/crankyoldgit/IRremoteESP8266/blob/00b27cc7ea2e7ac1e48e91740723c805a38728e0/src/IRsend.cpp#L123
    // Invoke a delay(), where possible, to avoid triggering the WDT.
    // see https://github.com/Arduino-IRremote/Arduino-IRremote/issues/1114 for the reason of checking for > 16383)
    // delayMicroseconds() is only accurate to 16383 us. Ref: https://www.arduino.cc/en/Reference/delayMicroseconds
    if (aMicroseconds > 16383) {
        delay(aMicroseconds / 1000UL);  // Delay for as many whole milliseconds as we can.
        // Delay the remaining sub-millisecond.
        delayMicroseconds(static_cast<uint16_t>(aMicroseconds % 1000UL));
    } else {
        delayMicroseconds(aMicroseconds);
    }
#else

#  if defined(__AVR__)
    unsigned long start = micros() - (64 / clockCyclesPerMicrosecond()); // - (64 / clockCyclesPerMicrosecond()) for reduced resolution and additional overhead
#  else
    unsigned long start = micros();
#  endif
// overflow invariant comparison :-)
    while (micros() - start < aMicroseconds) {
    }
#endif
}

/**
 * Enables IR output. The kHz value controls the modulation frequency in kilohertz.