/////////////////////////////
//
// prog_practice_9 project
// button.cpp
//
// 9/27/22  tj
//
// button.cpp
// using input interrupts and timer
//
//////////////////////////////
#include "mbed.h"
#include <stdio.h>

void splash(void);
void but_isr(void);

// global variable for ISR
int but_flag = 0;

// Global objects
Timer TB1;   // must be here to access it insude the ISR

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

    int tmp;
    tmp = 0;

    // create interrupt input object
    InterruptIn button(D4);
    button.fall(&but_isr);
    
    // splash
    splash();

    //hang out in loop
    while(1){
        tmp++;
    }

    return 0;
}// end main

void splash(void){
    printf("\n\n Reaction timer \n\n");

    return;
}// end splash

void but_isr(void){
    if(but_flag == 0)
        TB1.start();
    else{
        TB1.stop();
        printf("Reaction time = %llums\n", TB1.elapsed_time().count()/1000);
        TB1.reset();
    }
    but_flag = !but_flag;
    return;
}// end but_isr