Embedded Class - Final Project / Final

Infrared remote library for Arduino: send and receive infrared signals with multiple protocols Port from Arduino-IRremote https://github.com/z3t0/Arduino-IRremote

Dependents:   mbed-os-example-FinalReal mbed-os-example-FinalReal

irSend.cpp@0:70c8e56bac45, 2016-01-23 (annotated)

Committer:
yuhki50
Date:
Sat Jan 23 06:16:48 2016 +0000
Revision:
0:70c8e56bac45
Child:
3:17440cf7ab90
import https://github.com/z3t0/Arduino-IRremote e3ec11d

Who changed what in which revision?

UserRevisionLine numberNew contents of line
yuhki50 0:70c8e56bac45 1 #include "IRremote.h"
yuhki50 0:70c8e56bac45 2 #include "IRremoteInt.h"
yuhki50 0:70c8e56bac45 3
yuhki50 0:70c8e56bac45 4 //+=============================================================================
yuhki50 0:70c8e56bac45 5 void IRsend::sendRaw (unsigned int buf[], unsigned int len, unsigned int hz)
yuhki50 0:70c8e56bac45 6 {
yuhki50 0:70c8e56bac45 7 // Set IR carrier frequency
yuhki50 0:70c8e56bac45 8 enableIROut(hz);
yuhki50 0:70c8e56bac45 9
yuhki50 0:70c8e56bac45 10 for (unsigned int i = 0; i < len; i++) {
yuhki50 0:70c8e56bac45 11 if (i & 1) space(buf[i]) ;
yuhki50 0:70c8e56bac45 12 else mark (buf[i]) ;
yuhki50 0:70c8e56bac45 13 }
yuhki50 0:70c8e56bac45 14
yuhki50 0:70c8e56bac45 15 space(0); // Always end with the LED off
yuhki50 0:70c8e56bac45 16 }
yuhki50 0:70c8e56bac45 17
yuhki50 0:70c8e56bac45 18 //+=============================================================================
yuhki50 0:70c8e56bac45 19 // Sends an IR mark for the specified number of microseconds.
yuhki50 0:70c8e56bac45 20 // The mark output is modulated at the PWM frequency.
yuhki50 0:70c8e56bac45 21 //
yuhki50 0:70c8e56bac45 22 void IRsend::mark (unsigned int time)
yuhki50 0:70c8e56bac45 23 {
yuhki50 0:70c8e56bac45 24 TIMER_ENABLE_PWM; // Enable pin 3 PWM output
yuhki50 0:70c8e56bac45 25 if (time > 0) custom_delay_usec(time);
yuhki50 0:70c8e56bac45 26 }
yuhki50 0:70c8e56bac45 27
yuhki50 0:70c8e56bac45 28 //+=============================================================================
yuhki50 0:70c8e56bac45 29 // Leave pin off for time (given in microseconds)
yuhki50 0:70c8e56bac45 30 // Sends an IR space for the specified number of microseconds.
yuhki50 0:70c8e56bac45 31 // A space is no output, so the PWM output is disabled.
yuhki50 0:70c8e56bac45 32 //
yuhki50 0:70c8e56bac45 33 void IRsend::space (unsigned int time)
yuhki50 0:70c8e56bac45 34 {
yuhki50 0:70c8e56bac45 35 TIMER_DISABLE_PWM; // Disable pin 3 PWM output
yuhki50 0:70c8e56bac45 36 if (time > 0) IRsend::custom_delay_usec(time);
yuhki50 0:70c8e56bac45 37 }
yuhki50 0:70c8e56bac45 38
yuhki50 0:70c8e56bac45 39
yuhki50 0:70c8e56bac45 40
yuhki50 0:70c8e56bac45 41
yuhki50 0:70c8e56bac45 42
yuhki50 0:70c8e56bac45 43 //+=============================================================================
yuhki50 0:70c8e56bac45 44 // Enables IR output. The khz value controls the modulation frequency in kilohertz.
yuhki50 0:70c8e56bac45 45 // The IR output will be on pin 3 (OC2B).
yuhki50 0:70c8e56bac45 46 // This routine is designed for 36-40KHz; if you use it for other values, it's up to you
yuhki50 0:70c8e56bac45 47 // to make sure it gives reasonable results. (Watch out for overflow / underflow / rounding.)
yuhki50 0:70c8e56bac45 48 // TIMER2 is used in phase-correct PWM mode, with OCR2A controlling the frequency and OCR2B
yuhki50 0:70c8e56bac45 49 // controlling the duty cycle.
yuhki50 0:70c8e56bac45 50 // There is no prescaling, so the output frequency is 16MHz / (2 * OCR2A)
yuhki50 0:70c8e56bac45 51 // To turn the output on and off, we leave the PWM running, but connect and disconnect the output pin.
yuhki50 0:70c8e56bac45 52 // A few hours staring at the ATmega documentation and this will all make sense.
yuhki50 0:70c8e56bac45 53 // See my Secrets of Arduino PWM at http://arcfn.com/2009/07/secrets-of-arduino-pwm.html for details.
yuhki50 0:70c8e56bac45 54 //
yuhki50 0:70c8e56bac45 55 void IRsend::enableIROut (int khz)
yuhki50 0:70c8e56bac45 56 {
yuhki50 0:70c8e56bac45 57 // Disable the Timer2 Interrupt (which is used for receiving IR)
yuhki50 0:70c8e56bac45 58 TIMER_DISABLE_INTR; //Timer2 Overflow Interrupt
yuhki50 0:70c8e56bac45 59
yuhki50 0:70c8e56bac45 60 pinMode(TIMER_PWM_PIN, OUTPUT);
yuhki50 0:70c8e56bac45 61 digitalWrite(TIMER_PWM_PIN, LOW); // When not sending PWM, we want it low
yuhki50 0:70c8e56bac45 62
yuhki50 0:70c8e56bac45 63 // COM2A = 00: disconnect OC2A
yuhki50 0:70c8e56bac45 64 // COM2B = 00: disconnect OC2B; to send signal set to 10: OC2B non-inverted
yuhki50 0:70c8e56bac45 65 // WGM2 = 101: phase-correct PWM with OCRA as top
yuhki50 0:70c8e56bac45 66 // CS2 = 000: no prescaling
yuhki50 0:70c8e56bac45 67 // The top value for the timer. The modulation frequency will be SYSCLOCK / 2 / OCR2A.
yuhki50 0:70c8e56bac45 68 TIMER_CONFIG_KHZ(khz);
yuhki50 0:70c8e56bac45 69 }
yuhki50 0:70c8e56bac45 70
yuhki50 0:70c8e56bac45 71 //+=============================================================================
yuhki50 0:70c8e56bac45 72 // Custom delay function that circumvents Arduino's delayMicroseconds limit
yuhki50 0:70c8e56bac45 73
yuhki50 0:70c8e56bac45 74 void IRsend::custom_delay_usec(unsigned long uSecs) {
yuhki50 0:70c8e56bac45 75 if (uSecs > 4) {
yuhki50 0:70c8e56bac45 76 unsigned long start = micros();
yuhki50 0:70c8e56bac45 77 unsigned long endMicros = start + uSecs - 4;
yuhki50 0:70c8e56bac45 78 if (endMicros < start) { // Check if overflow
yuhki50 0:70c8e56bac45 79 while ( micros() > start ) {} // wait until overflow
yuhki50 0:70c8e56bac45 80 }
yuhki50 0:70c8e56bac45 81 while ( micros() < endMicros ) {} // normal wait
yuhki50 0:70c8e56bac45 82 }
yuhki50 0:70c8e56bac45 83 //else {
yuhki50 0:70c8e56bac45 84 // __asm__("nop\n\t"); // must have or compiler optimizes out
yuhki50 0:70c8e56bac45 85 //}
yuhki50 0:70c8e56bac45 86 }
yuhki50 0:70c8e56bac45 87