Irgendwie bekommen ich einen reset.

#include <avr/io.h>

#include <avr/interrupt.h>

#include <util/delay.h>

#include "Defines.h"

#include "Timer0_Function_Prototypes.h"

#include "Port_Initialization_Function_Prototypes.h"

#include "InputProc_Function_Prototypes.h"

#include "Output_Function_Prototype.h"

#include "Key_Enum.h"

#define MAX_STRING_SIZE 20

int main(void)

{

  InitPorts();

  InitTimer();

  sei();

  // No key is pressed at the beginning.

  KeyPressed keyPressed = None;

  unsigned char debouncedStateE = 0xFF;

  unsigned char debouncedStateF = 0xFF;

  // Mode variables.

  bool inputMode = true;

  bool outputMode = false;

  // String to store characters.

  unsigned char inputString[MAX_STRING_SIZE];

  unsigned char stringSz = 0;

  while (inputMode)

  {

    debouncedStateE = GetDebouncedStateE();

    debouncedStateF = GetDebouncedStateF();

    if (GetInputE(&keyPressed, debouncedStateE))

      InputProc(keyPressed, inputString, &stringSz);  

    else if (GetInputF(&keyPressed, debouncedStateF))

      InputProc(keyPressed, inputString, &stringSz);

    // If the max string size has been reached, switch to output mode.

    if (stringSz > MAX_STRING_SIZE - 2)

    {

      inputMode = false;

      outputMode = true;

    }          

  }

  // Append terminating null character to string.

  inputString[MAX_STRING_SIZE - 1] = '\0';

  while (outputMode)

  {

    PORTB = 0xFF;

  }

  return 0;

}

  while (outputMode)

  {

    PrintString(inputString);

  }

void PrintString(char* pInputString)

{

  PORTB = 0xFF;

}

while (true)

{

  while (inputMode)

  {

  ...

  }

  while (outputMode)

  {

  ...

  }

}