File content as of revision 0:f5694e6b4092:

/* mbed Microcontroller Library
 * Copyright (c) 2019 ARM Limited
 * SPDX-License-Identifier: Apache-2.0
 */

#include "mbed.h"
#include "platform/mbed_thread.h"
#include "LCD.h"

#define dg drehgeber>>9

InterruptIn dt(PA_9);
InterruptIn clk(PA_10);
PortIn drehgeber(PortA,0b11000000000);
PortOut diag(PortC,0b11111111);
int x=1,z=0,alt,neu,lsb[4]={3,0,2,1};


void drehgeberISR(void)
{
    neu=lsb[dg];
    diag=x;
    if (alt==3 && neu==0) z=z+1;
    if (alt==0 && neu==3) z=z-1;
    x=(z<<2)+neu;
    alt=neu;
}

void resetPos(void)
{
    x=1;
    z=0;
    //__disable_irq();
    diag=0;
}

int main()
{

    InterruptIn sw(PA_8);
    sw.fall(&resetPos);
    sw.mode(PullUp);
    dt.rise(&drehgeberISR);
    dt.fall(&drehgeberISR);
    clk.rise(&drehgeberISR);
    clk.fall(&drehgeberISR);
    //__disable_irq();
    lcd mylcd;
    mylcd.clear();
    mylcd.cursorpos(0);
    while (true) {
        
            
            mylcd.cursorpos(0);
            mylcd.printf("Position %d   ",x);
    
        
     }
}