#include <avr/io.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>
#include <stdio.h>
#include <stdint.h>

#define F_CPU 16000000

#include <util/delay.h>
#define RET_OKAY 0
#define RET_NOK  -1

void init (void)
{

  PORTB  = 0b11111111;
  PORTA  = 0b00000000;
  PORTD  = 0b00000000;

  DDRA   = 0b11111111;
  DDRB   = 0b11111111;
  DDRD   = 0b11111111;

  UCSRB  = 0b00011000;   //aktivieren der Interrupts
  UCSRC |= 0b10000000;
  UCSRC  = 0b10000110;
  UBRRL  = 0b01100111;  // Baudrate 9600
   
}

int send_chr(char sendChr)
{
  
  while (!(UCSRA & (1<<UDRE))) 		//warten bis Senden möglich
  {
  }
  UDR = sendChr;
  PORTB  = 0b11111110;
  _delay_ms (500);
  PORTB  = 0b11111111;
  _delay_ms (500);
  return RET_OKAY;
}


int send_str(char *sendStr)
{
  
  int ijk=0;
  while ( sendStr[ijk] != '\0')
  {
    send_chr(sendStr[ijk]);
  	ijk++;
  } 
 
  return RET_OKAY;
}


char char_empfangen()
{
  char empfangen_char;

  while(!(UCSRA & (1<<RXC)))
  {
    ;
  }
  empfangen_char = UDR;

  PORTB  = 0b11111011;
  _delay_ms (500);
  PORTB  = 0b11111111;
  _delay_ms (500);

  return (empfangen_char);
}



int main()
{
  char blabla;
  char empfangen_string[50] = ""; 
  char strString[100] = "initialisierung";
  char Vstring[] = "V-Solar";
  char Astring[] = "A-Solar";
  int  e = 0;
  

  init();
  send_str("Hallo Welt !");

  while (1)
  {
   
    blabla = char_empfangen();
   
    e = 0;
    while((blabla != ';') &&
          (e <= 48))
    {
      empfangen_string[e] = blabla;
      e++;
      blabla = char_empfangen();
    }
  
    empfangen_string[e] = '\0';
 
     
    if (strcmp(Vstring, empfangen_string) == 0)
    {
      strcpy(strString, "Vtest");
      send_str(&strString[0]);
    }
    else if (strcmp(Astring, empfangen_string) == 0)
    {
      strcpy(strString, "Atest");
      send_str(&strString[0]);
    }
    else
    {  /*       12345678901234567890 */
      send_str("Falsche Eingabe");         
    }
    
  }
        
  return RET_OKAY;
}