AVR-Chat

Dave VanHorn wrote:
> 
> Well, it's still got me.
> 
> USART1 continuously hits me with a TXD int, even though it's not enabled.
> 
> 
> .org 0
> 	rjmp	RESET		;
> 	rjmp	EX_INT0	;

...

> 	rjmp	USART1_UDRE	;
> 	rjmp	USART1_TX	; <---- I keep coming here.
> 	rjmp	TWI		;
> 	rjmp	SPM_READY	;
> 
> According to the ICE, I really am writing 00h to these registers, and they 
> are still zero (except UCSR1A) when the int happens.  Uart not enabled for 
> TX or RX, and UDR1 never written to, I just don't see why I'm getting 
> hammered like this.
> It ACTS like a UDRE, which is even worse. (ints all the time, after every 
> instruction!)
...

Maybe the avr-libc header file should be checked for errors. Check that the
mega128 one is really being used and not some other one.