// Calculator: Addition and Subtraction
// Joystick Up: +  ; Joystick Down - (Operator selection)
// Joystick Left: count value up (+1); Joystick Right: count value down (-1)
// Joystick Center: Calculate
// Joystick Left or Joystick Right: start at input of value 1 again

#include "mbed.h"
#include "C12832_lcd.h"

InterruptIn iiUp(p15);
DigitalIn diUp(p15);
InterruptIn iiDown(p12);
DigitalIn diDown(p12);
InterruptIn iiCenter(p14);
DigitalIn diCenter(p14);
InterruptIn iiLeft(p13);
DigitalIn diLeft(p13);
InterruptIn iiRight(p16);
DigitalIn diRight(p16);
uint8_t step = 0;
char calcOp = '+';
bool updateLcd = true;
int value1, value2, result;

// prototypes

// functions
uint8_t debounce(DigitalIn myIn)  
{
    #define LEVEL_CHECKS 8
    #define MAX_LOOPS 30                // stoppt das Überprüfen des Prellen nach max. MAX_LOOPS Durchläufen
    unsigned char port_buffer;
    unsigned char debounceCounter = 0;
    uint8_t loopCounter = 0;
    
    do
    {
        port_buffer = myIn;
        wait_us(100);
        loopCounter++;
        if(myIn == port_buffer)
          debounceCounter++;    // mindestens 'LEVEL_CHECKS' Abtastungen in Folge: gleicher Pegel
        else
          debounceCounter = 0;      
    }
    while ((debounceCounter <= LEVEL_CHECKS) && (loopCounter <= MAX_LOOPS));
    return loopCounter;
}

// ISR



// main program
int main() {
    C12832_LCD lcd;
    lcd.cls();
    lcd.locate(0,0);
    lcd.printf("5ABELI: Calulator");

    
    while(1) { 
        if (updateLcd) {
            updateLcd = false;
            switch (step) {
                case 0: 
                    lcd.locate(0, 20);
                    lcd.printf("%d                ", value1);
                    break;
								case 1:
				
									break;
				

                default: break;
            }
        }
    }
}