IR Slinger

Small C library for sending infrared packets on the Raspberry Pi This is a header-only library. Use it by including "irslinger.h" and linking to libmath, pigpio, and pthread (-lm -lpigpio -pthread)

Dependencies

• libpigpio
  • git clone https://github.com/joan2937/pigpio.git
  • cd pigpio
  • make
  • sudo make install

Build

gcc test.c -lm -lpigpio -pthread -lrt

Or

clang test.c -lm -lpigpio -pthread -lrt

The -lrt technically isn't necessary for most versions of gcc and clang, but I needed it to get Travis CI's compilers working.

Usage

NEC-like protocols:

#include <stdio.h>
#include "irslinger.h"

int main(int argc, char *argv[])
{
  uint32_t outPin = 23;            // The Broadcom pin number the signal will be sent on
  int frequency = 38000;           // The frequency of the IR signal in Hz
  double dutyCycle = 0.5;          // The duty cycle of the IR signal. 0.5 means for every cycle,
                                   // the LED will turn on for half the cycle time, and off the other half
  int leadingPulseDuration = 9000; // The duration of the beginning pulse in microseconds
  int leadingGapDuration = 4500;   // The duration of the gap in microseconds after the leading pulse
  int onePulse = 562;              // The duration of a pulse in microseconds when sending a logical 1
  int zeroPulse = 562;             // The duration of a pulse in microseconds when sending a logical 0
  int oneGap = 1688;               // The duration of the gap in microseconds when sending a logical 1
  int zeroGap = 562;               // The duration of the gap in microseconds when sending a logical 0
  int sendTrailingPulse = 1;       // 1 = Send a trailing pulse with duration equal to "onePulse"
                                   // 0 = Don't send a trailing pulse

  int result = irSling(
    outPin,
    frequency,
    dutyCycle,
    leadingPulseDuration,
    leadingGapDuration,
    onePulse,
    zeroPulse,
    oneGap,
    zeroGap,
    sendTrailingPulse,
    "01000001101101100101100010100111");

  return result;
}

RC-5-like protocols:

#include <stdio.h>
#include "irslinger.h"

int main(int argc, char *argv[])
{
    uint32_t outPin = 23;           // The GPIO pin number the signal will be sent on
    int frequency = 36000;          // The frequency of the IR signal in Hz
    double dutyCycle = 0.33;        // The duty cycle of the IR signal
    int pulseDuration = 889;        // The duration of the the pulses in microseconds

    int result = irSlingRC5(
        outPin, 
        frequency, 
        dutyCycle, 
        pulseDuration, 
        "11010101001100");

    return result;
}

Raw Codes:

#include <stdio.h>
#include "irslinger.h"

int main(int argc, char *argv[])
{
    uint32_t outPin = 4;            // The Broadcom pin number the signal will be sent on
    int frequency = 38000;          // The frequency of the IR signal in Hz
    double dutyCycle = 0.5;         // The duty cycle of the IR signal. 0.5 means for every cycle,
                                    // the LED will turn on for half the cycle time, and off the other half

    int codes[] = {
        9000, 4500, 600, 600, 600, 1688, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
        600, 1688, 600, 1688, 600, 600, 600, 1688, 600, 1688, 600, 600, 600, 1688, 600, 1688,
        600, 600, 600, 600, 600, 1688, 600, 600, 600, 1688, 600, 1688, 600, 600, 600, 600,
        600, 600, 600, 1688, 600, 600, 600, 1688, 600, 600, 600, 600, 600, 1688, 600, 1688,
        600, 1688, 600};

    int result = irSlingRaw(
        outPin,
        frequency,
        dutyCycle,
        codes,
        sizeof(codes) / sizeof(int));

    return result;
}

GPIO Pin info from the pigpio repo:

ALL gpios are identified by their Broadcom number. See elinux.org

There are 54 gpios in total, arranged in two banks.

Bank 1 contains gpios 0-31. Bank 2 contains gpios 32-54.

A user should only manipulate gpios in bank 1.

There are at least three types of board.

Type 1

26 pin header (P1).

Hardware revision numbers of 2 and 3.

User gpios 0-1, 4, 7-11, 14-15, 17-18, 21-25.

Type 2

26 pin header (P1) and an additional 8 pin header (P5).

Hardware revision numbers of 4, 5, 6, and 15.

User gpios 2-4, 7-11, 14-15, 17-18, 22-25, 27-31.

Type 3

40 pin expansion header (J8).

Hardware revision numbers of 16 or greater.

User gpios 2-27 (0 and 1 are reserved).