include <avr/io.h>
#include <stdlib.h>
#include <avr/delay.h>

//BAUDRATE
/*****************************************************/

#define CLOCK 12000000L
#define BAUD 9600L
//#define F_CPU 12000000L

#define UBRR_VAL ((CLOCK+BAUD * 8)/(BAUD*16)-1)			// runden
#define BAUD_REAL (CLOCK/(16*(UBRR_VAL+1)))			//reale Baudrate

#define BAUD_ERROR ((BAUD_REAL*1000)/BAUD-1000)			//Fehler in Promille

#if ((BAUD_ERROR>10)||(BAUD_ERROR<-10))
#error Fehler zu hoh. Baudrate korrigieren!!
#endif
/******************************************************/

uint16_t x, i, temp;
		
//main
/******************************************************/
int main(void)
{	
	
	UBRRH = UBRR_VAL >> 8;					//Baudratenregister einstellen
	UBRRL = UBRR_VAL & 0xFF;
   
   
 	UCSRB = (1<<RXEN)|(1<<TXEN);     			//UART TX einschalten
	UCSRC = (1<<URSEL)|(3<<UCSZ0);	 			//Asynchron 8N1
    
   	DDRC  = 0x0;						//Port C als Eingang (ADC)
	ADMUX = 0b11000000;					//ADC 0: PORT C0, Uref=2,56V (intern)
	ADCSRA = 0b10000111;					//10000111: ADC ein, STOP, Einzel, 0, Int. gesp., Teiler 128
	//while (1)
	//{ 
		for (i=0; i<=20; i++)
		{
		while (!(UCSRA & (1<<UDRE)));			//warten bis Senden mit UART möglich
		 
		ADCSRA |=(1<<ADSC);				//Start Einzelwandlung
		while (ADCSRA & (1<<ADSC));
		x = ADCL+ADCH*256;			

		temp = x/1000;
		x   -= temp*1000;
		UDR  = temp+0x30;
		
		temp = x/100;
		x   -= temp*100;
		UDR  = temp+0x30;
		
		temp = x/10;
		x   -= temp*10;
		UDR  = temp+0x30;
		
		UDR = x+0x30;
		
		_delay_ms(8000);
		UDR = 13;					//carriage return
		UDR = 10;					//new line

		}

	//}
return 0;	
}