///////////////////////////////
//
// prog_practice_8 project
//
// 9/26/22 - tj
//
// practice with input pin interrupts
//
///////////////////////////////
#include "mbed.h"
#include <stdio.h>

#define T_WAIT 200000

// create a global variable to use in ISR (allowed exception)
// note initialization - could get an interrupt before we get to 
// initialization inside main
int cnt = 0;

// prototype for ISR Fn. must be void, void
void my_int_isr(void);

void splash(void);

int main(void){
    setbuf(stdout, NULL);

    // splash
    splash();

    // create interrupt object
    InterruptIn my_pin_int(D4);

    // attach isr to my object
    my_pin_int.fall(&my_int_isr);

    // infinite loop to wait for interrupts
    while(1){
        printf("current cnt = %-8i\r", cnt);
        cnt++;
        wait_us(T_WAIT);
    }// end while

    return 0;
}// end main

void splash(void){
    printf("\n\n my interrupt program\n\n");

    return;
}// end splash;

void my_int_isr(void){
    // cnt++;
    cnt=0;

    return;
}// end my_int_isr