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#include <mega128.h>
#include <m8_128.h>                                   
#include <delay.h> 
#include <stdlib.h>  
#include <stdio.h> 

#define RXB8 1
#define TXB8 0
#define UPE 2
#define OVR 3
#define FE 4
#define UDRE 5
#define RXC 7

#define FRAMING_ERROR (1<<FE)
#define PARITY_ERROR (1<<UPE)
#define DATA_OVERRUN (1<<OVR)
#define DATA_REGISTER_EMPTY (1<<UDRE)
#define RX_COMPLETE (1<<RXC)

// USART1 Receiver buffer
#define RX_BUFFER_SIZE1 100
char rx_buffer1[RX_BUFFER_SIZE1];

#if RX_BUFFER_SIZE1<256
unsigned char rx_wr_index1,rx_rd_index1,rx_counter1;
#else
unsigned int rx_wr_index1,rx_rd_index1,rx_counter1;
#endif

// This flag is set on USART1 Receiver buffer overflow
bit rx_buffer_overflow1;

// USART1 Receiver interrupt service routine
interrupt [USART1_RXC] void usart1_rx_isr(void)
{
char status,data;
status=UCSR1A;
data=UDR1;
if ((status & (FRAMING_ERROR | PARITY_ERROR | DATA_OVERRUN))==0)
   {
   rx_buffer1[rx_wr_index1]=data;
   if (++rx_wr_index1 == RX_BUFFER_SIZE1) rx_wr_index1=0;
   if (++rx_counter1 == RX_BUFFER_SIZE1)
      {
      rx_counter1=0;
      rx_buffer_overflow1=1;
      };
   };
}

// Get a character from the USART1 Receiver buffer
#pragma used+
char getchar1(void)
{
char data;
while (rx_counter1==0);
data=rx_buffer1[rx_rd_index1];
if (++rx_rd_index1 == RX_BUFFER_SIZE1) rx_rd_index1=0;
#asm("cli")
--rx_counter1;
#asm("sei")
return data;
}
#pragma used-
// Write a character to the USART1 Transmitter
#pragma used+
void putchar1(char c)
{
while ((UCSR1A & DATA_REGISTER_EMPTY)==0);
UDR1=c;
}
#pragma used-

// Declare your global variables here

void main(void)
{
 char a;  

// USART1 initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART1 Receiver: On
// USART1 Transmitter: On
// USART1 Mode: Asynchronous
// USART1 Baud Rate: 9600
UCSR1A=0x00;
UCSR1B=0x98;
UCSR1C=0x06;
UBRR1H=0x00;
UBRR1L=0x67;

// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;

// Global enable interrupts
#asm("sei")

while (1)
      {
       if (rx_counter1 !=0){
           a=getchar1();
           putchar1(a);
           }
           else putchar1('a') ;
      };
}