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Kod: Markera allt

SIGNAL (SIG_USART_RECV) 
{ 
    // Read input buffer
	TransmitByte (ReceiveByte () + 1);        // Echo the received character + 1. 

}

Kod: Markera allt

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

/* Prototypes */
void InitUART (unsigned char baudrate);
unsigned char ReceiveByte (void);
void TransmitByte (unsigned char data);
void delay(int msek);

ISR(USART_RXC_vect)    // <= Det är detta som skiter sig!
{ 
    // Read input buffer
	TransmitByte (ReceiveByte () + 1);        // Echo the received character + 1. 
}

// This function enabled interrupt.
void int1_init()
{
	cli(); /*Disable interrupt*/
	sei(); /*Enable interrupt*/
}

/* Main - simple program that recieves a character then
transmits back the next character.  An example would be if you send in an A, the chip will return a B */
int main (void){

	DDRB = 0xFF; //Sätt till utgång.
	PORTB = 0x55; //Alla port B 0-or.
	//unsigned char i;
  	InitUART (207);    /* Set the baudrate to 2400 bps using a 8MHz */ 
  	int1_init();
  
  while (1)
    {
      // Just do something...
	  delay(100);
	  PORTB |= (1 << PB0);
	  delay(100);
	  PORTB &= ~(1 << PB0 );
    }
}

/* Initialize UART */
void InitUART (unsigned char baudrate){
  /* Set the baud rate */
  UBRRL = baudrate;
  /* Enable UART receiver and transmitter */
  UCSRB = (1 << RXEN) | (1 << TXEN);
  /* 8 data bits, 1 stop bit */
  UCSRC = (1 << UCSZ1) | (1 << UCSZ0);
}

/* Read and write functions */
unsigned char ReceiveByte (void){
  /* Wait for incomming data */
  while (!(UCSRA & (1 << RXC)));
  /* Return the data */
  return UDR;
}

void TransmitByte (unsigned char data){
  /* Wait for empty transmit buffer */
  while (!(UCSRA & (1 << UDRE)));
  /* Start transmittion */
  UDR = data;
}

Kod: Markera allt

avr-gcc.exe -mmcu=attiny2313 -Wl,-Map=SerialTest.map SerialTest.o delay.o     -o SerialTest.elf