Re: [avr-gcc-list] Serial Communication

[Dave Hansen]

From: ks_347 <address@hidden>
[...]
> In this serial communication righnow I am just sending the data to PC and 
> not receiving anything from PC, regarding the interrupt handling routine, 
> should I write routine for UDRE(data register empty) or TXC(tranmission 
> complete) interrupt?

As always, the answer is "it depends."

But for simple RS-232 communications to the PC, I would suggest DRE rather 
than TXC.  It is ever so slightly more efficient, and coding is simpler:

  void transmit_routine( char *bfr, size_t len){
     queue_up_characters(bfr, len);
     enable_DRE_interrupt();
  }

  SIGNAL(DRE)
  {
     if (queue_is_empty(){
        disable_DRE_interrupt();
     }else{
        UDR = get_next_character_from_queue();
     }
  }

Done.  Regards,
  -=Dave

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