/*includes*/
#include <mega163.h>
#include <delay.h>


/*ADMUX Selection Register Bit Definitions*/
#define REFS1 7
#define REFS0 6
#define ADLAR 5
#define MUX4 4
#define MUX3 3
#define MUX2 2
#define MUX1 1
#define MUX0 0

/*ADC Control and Status Register-ADCSR*/
#define ADEN 7
#define ADSC 6
#define ADFR 5
#define ADIF 4
#define ADIE 3
#define ADPS2 2
#define ADPS1 1
#define ADPS0 0

/*UART Control Register Bit Definitions */
#define RXCIE 7
#define TXCIE 6
#define UDRIE 5 
#define RXEN 4
#define TXEN 3
#define CHR9 2
#define RXB8 1
#define TXB8 0

/* UART Status Register Bit Definitions */
#define RXC 7
#define TXC 6
#define UDRE 5
#define FE 4
#define OR 3 

/* Analog Comparator */
#define ACD 7

/*Variables*/ 
/*unsigned char LowByte;*/
unsigned char HighByte;
unsigned char HeaderByte=0x80;
/*unsigned char StartByte = 255;
unsigned char StopByte = 0;*/
register static unsigned char x=0;

/*Prtototypes*/
void InitUART( unsigned char baudrate );
void TransmitByte( unsigned char data );


/*Main- My Adaptation of AVR's Test Program*/

void main (void)
{

ACSR=(1<<ACD); /*Reduces Current draw by turning off Analog Comparator */
ADCSR=((1<<ADEN)|(0<<ADFR)|(1<<ADPS2)|(1<<ADPS0)|(0<<ADPS1)); /*ADC Enable and prescaler settings*/
ADMUX=((1<<REFS1)|(1<<REFS0)|(1<<ADLAR)); /*Set Mux Ref Voltage = Vcc(01=Vcc, 11=2.56V), and Left Adjusts*/

InitUART(51); /*Sets BuadRate at 9600. 51=4800 25=9600 103=2400 */ 

while (1)
{

switch (x)
{ 
case 0:
break;

case 1: 
ADMUX.0=1; /* This has to be here or the last byte will be transmitted twice */
ADMUX.1=1;
ADMUX.2=1;
ADMUX.3=1;
ADMUX.4=1;
TransmitByte(HeaderByte);/*transmitt a headerbyte before the data*/
break;

case 2: ADMUX.0=0;
ADMUX.1=0;
ADMUX.2=0;
ADMUX.3=0;
ADMUX.4=0;
break;

case 3: ADMUX.0=1;
ADMUX.1=0;
ADMUX.2=0;
ADMUX.3=0;
ADMUX.4=0;
break;

case 4: ADMUX.0=0;
ADMUX.1=1;
ADMUX.2=0;
ADMUX.3=0;
ADMUX.4=0;
break;

case 5: ADMUX.0=1;
ADMUX.1=1;
ADMUX.2=0;
ADMUX.3=0;
ADMUX.4=0;
break;

case 6: ADMUX.0=0;
ADMUX.1=0;
ADMUX.2=1;
ADMUX.3=0;
ADMUX.4=0;
break; 

case 7: ADMUX.0=1;
ADMUX.1=0;
ADMUX.2=1;
ADMUX.3=0;
ADMUX.4=0;
break;

case 8: ADMUX.0=0;
ADMUX.1=1;
ADMUX.2=1;
ADMUX.3=0;
ADMUX.4=0;
break;

case 9: ADMUX.0=1;
ADMUX.1=1;
ADMUX.2=1;
ADMUX.3=0;
ADMUX.4=0;
break;

} 

/*LowByte=ADCL;
TransmitByte(StartByte);*/
ADCSR.6=1;

loop: if (ADCSR.6=1) /*wait until conversion is complete */ 
{ 
delay_ms(1);
goto loop;
}

HighByte=ADCH; 
if(x!=1|x!=0)TransmitByte(HighByte); /*If this is not the first intial run or the header, then transmit*/

/*TransmitByte(HighByte); */
/*TransmitByte(StopByte);
TransmitByte(LowByte);*/

if (++x>(9)) /*change to 9 if I need the last Case switch*/
x=1;

}
}

/*initialize UART */
void InitUART( unsigned char baudrate)
{
UBRR= baudrate;
UCSRB=(0<<CHR9);
UCSRB=(1<<TXEN);
}

/* Write Functions*/

void TransmitByte(unsigned char data)
{
while ( !(UCSRA & (1<<UDRE)))
;
UDR=data;
}