Problem with serial.write() implementation using interrupt

Projects Programming
1

I would like to implement serial.write() command in Arduino UNO by using interrupt command of Atmel Atmega328P.

The data of Atmega328P is: http://www.atmel.com/Images/doc8271.pdf

The following is the code I try to write but it seems like it doesn't work.

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

#define BAUD 9600

void serial_init()
{
        uint16_t   ubbr;

        ubbr = 103;
        UBRR0H = ubbr >> 8;
        UBRR0L = ubbr & 0xff;

#if 0
        UBRR0H = UBRRH_VALUE;
        UBRR0L = UBRRL_VALUE;
#endif
        UCSR0C = (3 << UCSZ00);
        UCSR0B = (1 << RXEN0) | (1 << TXEN0);
        UCSR0B = (1<<TXCIE0);

        return;
}

char *uart = "abc";
int i=0;

ISR(USART_TXC_vect){
  if (i<5)
  UDR0=uart[i++]; 
}

int main(void){
  serial_init();
  return 0;}

Thanks for your help :slight_smile:

2

What version of the IDE are you using? In 1.0, serial output is already interrupt based.