/*#############################################################

Program Name    : ex3_button_led
Author          : Grant Phillips
Date Modified   : 12/01/2016
Compiler        : ARMmbed
Tested On       : STM32F4-Discovery

Description     : Reads the value of button and then turns an
                  LED ON when the button is ON otherwise the
                  LED is turned OFF.     

Requirements    : * STM32F4-Discovery Board
              
Circuit         : * a pushbutton connected to PE8 with a 
                    pullup resitor
                  * a LED connected to PD8

##############################################################*/

#include "mbed.h"
 
DigitalIn button(PE_8);
DigitalOut led(PD_8);

int main() {
    while(1) {
        if (button == 0)    //inverse logic due to external pullup resistor on button
            led = 1;
        else
            led = 0;
    }
}