///////////////////////////////////
//
// lab2_base project
//
// created 7/8/21 by tj
// rev 0
//
///////////////////////////////////
//
// Base program for Lab2
//
// This codes flashes an external LED on and off
//    and prints on or off to the console
//
// The external LED is connected to D4
//
// Inputs: none
// Outputs: external LED
//
/////////////////////////////////////////////


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

#define T_WAIT 2000000     // in us

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

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

    // splash 
    printf("\n\nlab2_base\n");
    printf("Using Mbed OS version %d.%d.%d\n\n", 
            MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
            
    // Initialize LED
    MyLED.write(0);         // start with LED off

    // print header
    printf("LED value\n");
    
    // run an infinite loop
    while(1){
        // flash the LED and print to the terminal
        printf("off\n");
        MyLED.write(0);
        wait_us(T_WAIT);
        
        printf("on\n");
        MyLED.write(1);
        wait_us(T_WAIT);
    }// end while
    
   return 0;
}// end main