Infrared remote library for Arduino: send and receive infrared signals with multiple protocols Port from Arduino-IRremote https://github.com/z3t0/Arduino-IRremote
irSend.cpp
- Committer:
- eunmango
- Date:
- 2019-06-16
- Revision:
- 8:0650578366fd
- Parent:
- 6:ee990cddff48
File content as of revision 8:0650578366fd:
#include "IRremote.h" #include "IRremoteInt.h" #include "cmath" //+============================================================================= void IRsend::sendRaw (unsigned int buf[], unsigned int len, unsigned int hz) { // Set IR carrier frequency enableIROut(hz); for (unsigned int i = 0; i < len; i++) { if (i & 1) space(buf[i]) ; else mark (buf[i]) ; } space(0); // Always end with the LED off } //+============================================================================= // Sends an IR mark for the specified number of microseconds. // The mark output is modulated at the PWM frequency. // void IRsend::mark (unsigned int time) { _pwm.write(0.5); // Enable PWM output if (time > 0) custom_delay_usec(time); } //+============================================================================= // Leave pin off for time (given in microseconds) // Sends an IR space for the specified number of microseconds. // A space is no output, so the PWM output is disabled. // void IRsend::space (unsigned int time) { _pwm.write(0.0); // Disable PWM output if (time > 0) IRsend::custom_delay_usec(time); } //+============================================================================= // Enables IR output. The khz value controls the modulation frequency in kilohertz. // The IR output will be on pin 3 (OC2B). // This routine is designed for 36-40KHz; if you use it for other values, it's up to you // to make sure it gives reasonable results. (Watch out for overflow / underflow / rounding.) // TIMER2 is used in phase-correct PWM mode, with OCR2A controlling the frequency and OCR2B // controlling the duty cycle. // There is no prescaling, so the output frequency is 16MHz / (2 * OCR2A) // To turn the output on and off, we leave the PWM running, but connect and disconnect the output pin. // A few hours staring at the ATmega documentation and this will all make sense. // See my Secrets of Arduino PWM at http://arcfn.com/2009/07/secrets-of-arduino-pwm.html for details. // void IRsend::enableIROut (int khz) { _pwm.write(0.0); _pwm.period_us(std::floor((1.0 / khz * 1000) + 0.5)); // round } //+============================================================================= // Custom delay function that circumvents Arduino's delayMicroseconds limit void IRsend::custom_delay_usec(unsigned long uSecs) { if (uSecs > 4) { unsigned long start = us_ticker_read(); unsigned long endMicros = start + uSecs - 4; if (endMicros < start) { // Check if overflow while ( us_ticker_read() > start ) {} // wait until overflow } while ( us_ticker_read() < endMicros ) {} // normal wait } //else { // __asm__("nop\n\t"); // must have or compiler optimizes out //} }