45 lines
1.0 KiB
C++
45 lines
1.0 KiB
C++
#include <Arduino.h>
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#include <IRSender.h>
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// Send IR using the 'bit banging' on ESP8266 etc.
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IRSenderBitBang::IRSenderBitBang(uint8_t pin) : IRSender(pin)
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{
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pinMode(_pin, OUTPUT);
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}
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void IRSenderBitBang::setFrequency(int frequency)
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{
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// Enables IR output. The khz value controls the modulation frequency in kilohertz.
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_halfPeriodicTime = 500/frequency; // T = 1/f but we need T/2 in microsecond and f is in kHz
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(void)frequency;
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}
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// Send an IR 'mark' symbol, i.e. transmitter ON
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void IRSenderBitBang::mark(int markLength)
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{
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long beginning = micros();
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while((int)(micros() - beginning) < markLength){
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digitalWrite(_pin, HIGH);
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delayMicroseconds(_halfPeriodicTime);
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digitalWrite(_pin, LOW);
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delayMicroseconds(_halfPeriodicTime); //38 kHz -> T = 26.31 microsec (periodic time), half of it is 13
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}
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}
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// Send an IR 'space' symbol, i.e. transmitter OFF
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void IRSenderBitBang::space(int spaceLength)
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{
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digitalWrite(_pin, LOW);
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if (spaceLength < 16383) {
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delayMicroseconds(spaceLength);
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} else {
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delay(spaceLength/1000);
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}
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} |