AVR-Chat

I think I'm talking about using "ISR_NAKED" as an attribute, but how do I do that?

For example, if this is my code:
>>>
ISR(PCINT0_vect)
{
    if(bit_is_set(PINB,PORTB2))
    {
        SPCR = 0;
        ui8Status = 1;
    }
}
<<<

I know I'll have to end the routine with "reti(); but how do I specify the "ISR_NAKED" attribute, and how do I know if I need to save any registers?
For the code about, I would save and restore SREG but that's all I would do...

Thanks,

Cat


> To: avr-chat@yahoogroups.com
> From: catalin_cluj@hotmail.com
> Date: Wed, 20 Jan 2010 14:06:54 -0700
> Subject: [AVR-Chat] Any way to make interrupts faster, please?
> 
> 
> Hi,
> I seem to remember that there's a way to tell the compiler to not do context saving/restoring when going into an ISR on ATMega chips (I know XMegas, etc can do it, I'm only interested in the ATMega now).
> 
> Am I dreaming, or is it possible?
> 
> Or is it only possible in assembly, in which case how would an assembly ISR look in the middle of C code, please?
> 
> Thanks,
> 
> Cat
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