///////////////////////////////////
//
// lab3_base project
//
// created 7/8/21 by tj
// rev 0
//
///////////////////////////////////
//
// Base program for Lab3
//
// This codes controls an external LED on and off
// using an external button
// and prints on or off to the console
//
// The external LED is connected to D4
// The external button is connected to D5
//
// Inputs: external button - with pull-up
// Outputs: external LED
//
/////////////////////////////////////////////


#include "mbed.h"
#include <stdio.h>         // only needed when printing

// Global HARDWARE Objects
// create the LED object tied to D4
DigitalOut MyLED(D4);
// create the button object tied to D5
DigitalIn MyButton(D5);

int main(void){
    setbuf(stdout, NULL);  // disable buffering when printing

    // splash 
    printf("\n\nlab3_base\n");
    printf("Using Mbed OS version %d.%d.%d\n\n", 
            MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
    
    // working variables
    uint8_t button_val;
    
    // print header info
    printf("led\n"); 
       
    // run an infinite loop
    while(1){
        // read the current button value
        button_val = MyButton.read();
        
        // turn the LED on or off
        if(button_val == 0){     // pushed
            MyLED.write(1);
            printf("on ");  
        }else{
            MyLED.write(0);
            printf("off");
        }// end if 

	// return to the beginning of the line
	// so that the text stays on a single line
	// otherwise it would scroll super fast
	printf("\r");                 
    }// end while
    
   return 0;
}// end main