utility.cpp

00001 /******************************************************************************
00002 * EECS 397
00003 *
00004 * Assignment Name: Lab 6: WaG
00005 * 
00006 * Authors: Sam Morrison and Phong Nguyen 
00007 * File name: utility.cpp
00008 * Purpose: Utility functions
00009 *
00010 * Created: 03/20/2018
00011 * Last Modified: 03/20/2018
00012 *
00013 ******************************************************************************/
00014 
00015 #include "mbed.h"
00016 #include "io_pins.h"
00017 #include "utility.h"
00018 #include <stdlib.h>
00019 #include <stdio.h>
00020 #include <string.h>
00021 
00022 extern DigitalIn start_button;
00023 
00024 /*
00025  * int uti_chk_ubutton();
00026  * Description: returns true when button is pressed and released
00027  *
00028  * Inputs: 
00029  *      Parameters:
00030  *      Globals:
00031  *      
00032  * Outputs:
00033  *      Returns: void
00034 */
00035 int uti_chk_ubutton() {
00036     if (start_button == 0)
00037         return 0; // exits if button is not pressed
00038     else {
00039         //cycle until button is released
00040         do { 
00041         wait(0.02); 
00042         } while (start_button == 1); 
00043         wait(0.02); //delay to prevent debounce
00044         return 1;
00045     }
00046 }