File content as of revision 1:9f6f3af9aaaa:

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.
 
  This example code is in the public domain.
*/
//  #include is a directive that "pastes" a file into your code.
//  Use this specific #include at the beginning of each mbed program.
//  mbed.h contains/points to the full definitions of our simple statements.
#include "mbed.h"
//  Define the object board_LED to be a digital output connected to LED1,
//  which is the little green LED built into the Nucleo board.
DigitalOut board_LED(LED1);
/*  The "main" function defines your main program -- it executes as soon as
    you program the board.
 
    Functions can return (compute and give back) a value.  The main function
    could return an integer error code, so it begins with int.
    
    Functions can also accept inputs.  The main function cannot however, so
    its round parentheses are empty.
*/  
int main() {   // This curly brace marks the beginning of the main function.
    // while() will repeat a set of actions as long as the statement inside
    // its round parentheses is true. 1 is the definition of true, so
    // while(1) and while(true) repeat forever. 
    while(true) {   // This curly brace marks the start of the repeated actions.
    
        board_LED = 1;  // Turn on LED by storing a 1 in board_LED.
        wait(0.5);      // wait(x) will pause for a given number of seconds.
        board_LED = 0;  // Turn off LED by storing a 0 in board_LED.
        wait(0.5);      // wait another 1/2 second.
    }  // end of repeated actions  
}  // end of main function