mbed-os/libraries/tests/mbed/interruptin/main.cpp

#include "test_env.h"

DigitalOut myled(LED1);
DigitalOut led2(LED2);

volatile int checks = 0;
void in_handler() {
    checks++;
    led2 = !led2;
}

#define PIN_IN      (p5)
#define PIN_OUT     (p25)

DigitalOut out(PIN_OUT);
InterruptIn in(PIN_IN);

void flipper() {
    for (int i = 0; i < 5; i++) {
        out = 1; myled = 1; wait(0.2);
        
        out = 0; myled = 0; wait(0.2);
    }
}

int main() {
    out = 0; myled = 0;
    
    //Test falling edges first
    in.rise(NULL);
    in.fall(in_handler);
    flipper();
    
    if(checks != 5) {
        printf("falling edges test failed\n");
        notify_completion(false);
    }
    
    //Now test rising edges
    in.rise(in_handler);
    in.fall(NULL);
    flipper();
    
    if (checks != 10) {
        printf("raising edges test failed\n");
        notify_completion(false);
    }
    
    //Finally test both
    in.rise(in_handler);
    in.fall(in_handler);
    flipper();
    
    if (checks != 20) {
        printf("Simultaneous rising and falling edges failed\n");
        notify_completion(false);
    }
    
    notify_completion(true);
    return 0;
}