AVR-Chat

David
   In addition to the other responses, is the following what you 
intended elsewhere?

if ((Raw_Data_Size == 0) && !(GICR & (1 << INT0)))

(note usage of '==' and '&&')

You might also want to revisit the following:

GICR  |= (1<<INT0)|(0<<INT1);

It might be what you want but, for reference is equivalent to

GICR  |= (1<<INT0);

Regards
-Bill Knight
R O SoftWare


David VanHorn wrote:
> I'm using GCC.
> 
> When I comment out the first Debug_Port line, the debug pin does not go high.
> When I leave it in, the debug pin goes high, but never goes low.
> Am I missing something special I have to do to exit an ISR?
> 
> // Timer 0 overflow ISR
> ISR(TIMER0_OVF_vect)
> {
> 	Debug_Port |= (1 << Debug_Pin);	// High
> 	
> 	// Dec to zero timer
> 	if (LCD_Timer > 0)
> 	{
> 	LCD_Timer--;
> 	}
> 	
> 	if ((Raw_Data_Size = 0) & !(GICR & (1<< INT0))) //
> 	// If the summer is finished, and sampling is disabled
> 	{// enable sampling
> 		GICR  |= (1<<INT0)|(0<<INT1);	// Enable eampling
> 		Raw_Edge_Flag = 0;				// Looking for the start of a pulse
> 	}
> 	
> 	Debug_Port |= (0 << Debug_Pin);		// Low
> }
>