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

Program Name    : ex9_button_count_debounce
Author          : Grant Phillips
Date Modified   : 12/01/2016
Compiler        : ARMmbed
Tested On       : STM32F4-Discovery

Description     : This is the upgrade of ex8_button_count to 
                  compensate for the debounce effect on the 
                  pushbutton which causes the inconsistend
                  counting. 

Requirements    : * STM32F4-Discovery Board
              
Circuit         : * 8 LEDs connected to PD15 - PD8
                  * a pushbutton connected to PE8 with a 
                    pullup resitor

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

#include "mbed.h"

BusOut myleds(PD_8, PD_9, PD_10, PD_11, PD_12, PD_13, PD_14, PD_15);
//            bit0  bit1  bit2   bit3   bit4   bit5   bit6   bit7 . . . 

DigitalIn button(PE_8);

int main() {
    uint8_t count=0;
    
    while(1) {
        if(button == 0) {               //is the pushbutton pressed (input = 0)
            wait(0.01);                 //wait 10ms for debounce  
            if(button == 0) {           //is the pushbutton still pressed?
                count = count + 1;      //increment count
                myleds = count;         //display count on LEDs
                while(button == 0) {    //wait for the pushbutton to be released
                    //do nothing
                }
            }    
        } 
    }
}