IRMP - Infrared Multiprotocol Decoder

Sample for decoding and performance test

#include "mbed.h"
#include "irmp.h"

#define LED_ON  0
#define LED_OFF 1

// LED as test output
DigitalOut led(LED1, LED_OFF);
DigitalOut flash(LED2, LED_OFF);

// cyclic interrupt for IRMP ISR worker
Ticker t;

// only for performance test
Timer   timerPerfTest;
int     timeISRMax = 0;
float   timeISRAvg;
int     timeISRAvgSum = 0;
int     countISRCalls = 0;

// this ISR must be called cyclic
void irmpISR(void)
{
    int t1 = timerPerfTest.read_us();               // read performance timer

    irmp_ISR();                                     // call irmp ISR

    int timeISR = timerPerfTest.read_us() - t1;     // calc time spent in worker ISR
    if (timeISR > timeISRMax)                       // store maximum
        timeISRMax = timeISR;
    timeISRAvgSum += timeISR;                       // sum for avg
    countISRCalls++;
}

int main() {
    printf("IRMP on mbed\n");

    led = LED_OFF;
    timerPerfTest.start();

    // irmp_data holds result of received IR code
    IRMP_DATA irmp_data;

    irmp_init();                                                            // initialize irmp
    t.attach_us(&irmpISR, 1E6 / F_INTERRUPTS);                              // call ISR 15.000 / s

    // infinite loop, interrupts will blink PORTD pins and handle UART communications.
    while (1)
    {
        flash = !flash;     // test output. flashes at 15/2 kHz, you will not see it blinking

        // check for received IR commands
        if (irmp_get_data (&irmp_data))
        {
            // ir signal decoded, do something here...
            // irmp_data.protocol is the protocol, see irmp.h
            // irmp_data.address is the address/manufacturer code of ir sender
            // irmp_data.command is the command code
            // irm_data.flags is press/release information
            // irmp_protocol_names[irmp_data.protocol] is the protocol name (if enabled, see irmpconfig.h)
            // printf("proto %d addr %d cmd %d\n", irmp_data.protocol, irmp_data.address, irmp_data.command );

            // sample decoding, turn LED on / off
            if (irmp_data.protocol == IRMP_RC5_PROTOCOL && irmp_data.address == 5)      // old RC5 VCR Remote. TV uses address 0
            {
                if (irmp_data.flags == 0)       // switch only on button press
                {
                    switch (irmp_data.command)
                    {
                    case 0:     // Key '0'
                        led = LED_OFF;
                        break;
                    case 1:     // Key '1'
                        led = LED_ON;
                        break;
                    case 53:        // Key 'play'
                        printf("bring me a beer!\n");
                        break;
                    case 54:        // Key 'stop'
                        timeISRAvg = (float)timeISRAvgSum / countISRCalls;
                        timeISRAvgSum = 0;
                        countISRCalls = 0;
                        printf("ISR max / avg runtime [microseconds] : %d / %5.2f\n", timeISRMax, timeISRAvg);
                        timeISRMax = 0;
                        break;
                    }
                }
            }

            // log to stdout
            printf("proto %d addr %d cmd %d flags %x name %s\n", irmp_data.protocol, irmp_data.address, irmp_data.command, irmp_data.flags, irmp_protocol_names[irmp_data.protocol] );
        }
    }

}