usart.h

#ifndef USART_H_
#define USART_H_

void USARTInit(void);
void USARTInitRecieverInterrupt(void);
int USARTSendByte(char data, FILE *stream);
int USARTReceiveByte(FILE *stream);
int USARTReceiveByteWithoutEcho(FILE *stream);


void USARTInit(void)
{
UCSRA=0x00;
UCSRB=0x18;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x67;
}

void USARTInitRecieverInterrupt(void)
{
UCSRA=0x00;
UCSRB=0x98;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x67;
}

int USARTSendByte(char data, FILE *stream)
{
   if(data == '\n')
   {
      USARTSendByte('\r', 0);
   }
while(!(UCSRA&(1<<UDRE))){};
UDR = data;
return 0;
}

int USARTReceiveByte(FILE *stream)
{
char data;
while(!(UCSRA&(1<<RXC))){};
data=UDR;
USARTSendByte(data,stream);
return data;
}

int USARTReceiveByteWithoutEcho(FILE *stream)
{
uint8_t data;
while(!(UCSRA&(1<<RXC))){};
data=UDR;
return data;
}
#endif