Button

#include "mbed.h"

InterruptIn selector(p16);
DigitalOut s1(p17);
DigitalOut s2(p18);
DigitalOut s3(p19);
DigitalOut s4(p20);
DigitalOut s5(p21);

void select() {
    led = !led;
}

int main() {
    selector.rise(&select);  // attach the address of the "select" function to the rising edge

}


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