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#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>

#define myXPaddress 0b00000010
//#define transmit_en PD0

void avr_init(void);
void clear_buff(unsigned char buff);

volatile unsigned char bit9 = 0;
volatile unsigned char rbyte = 0;
volatile unsigned char pc_rbyte = 0;

volatile unsigned char pc_command[17];
volatile unsigned char xp_response[15];

volatile unsigned char pc_rec_pos = 0;
volatile unsigned char xp_rec_pos = 0;

volatile unsigned char pc_rec_en = 0;
volatile unsigned char xp_rec_en = 0;

volatile unsigned char pc_buff_ready = 0;
volatile unsigned char xp_buff_ready = 0;

volatile unsigned char my_window = 0;
volatile unsigned char ack = 0;

volatile unsigned char xp_xor = 0;

volatile unsigned char COMM = 0;

unsigned char i;

void rs485_ransmit( unsigned char data )
{
	while ( !( UCSR0A & (1<<UDRE0)) );
	UCSR0B &= ~(1<<TXB80); // SET 9 BIT IN 0
	UDR0 = data;
}

unsigned char rs485_reciv(void)
{
	char status,data;
	
	status=UCSR0A;
	bit9 = UCSR0B;
	data=UDR0;
	if ( status & ( (1<<FE)|(1<<DOR)|(1<<UPE) ) )
		return 0;
	
	return data;
}

unsigned char rs232_reciv( void )
{
	while ( !(UCSR1A & (1<<RXC1)) );
	return UDR1;
}
void rs232_transmit( unsigned char data )
{
	while ( !( UCSR1A & (1<<UDRE1)) );
	UDR1 = data;
}


ISR(USART1_RX_vect)
{
	pc_rbyte = rs232_reciv();
	
	if( pc_buff_ready == 1 && pc_rbyte == 0xFA )
	{
		pc_rec_en = 0;
		rs232_transmit('B');
		rs232_transmit('U');
		rs232_transmit('F');
		rs232_transmit('F');
		rs232_transmit(' ');
		rs232_transmit('O');
		rs232_transmit('V');
		rs232_transmit('F');
		return;
	}
		
	if( pc_rec_en == 1 )
		if( pc_rbyte == 0xFF)
		{
			pc_rec_en = 0;
			pc_buff_ready = 1;
			return;
		}
		else
		{
			pc_command[pc_rec_pos] = pc_rbyte;
			pc_rec_pos++;
			return;
		}