Re: [avr-gcc-list] 2 interrupt sharing the same ISR

[gouy yann]

 --- David Kelly <address@hidden> a écrit : 
> 
> On Jan 14, 2005, at 4:21 PM, gouy yann wrote:
> 
> > I'd like to know if someone has an easy trick to
> make
> > 2 interrupts ( timer overflow and timer output
> compare
> > ) jump to the same address (ISR).
> 
> So how would you know which event launched the
> service routine?

both cases are for the timer0 (ATmega32) but
sometimes, it is configured for overflow and sometimes
for compare. depending on the configuration, the call
back won't be the same neither.

> 
> The AVR is unique among MCUs I have used in that the
> IRQ flag is 
> automatically cleared by the MCU when the service
> vector is loaded. On 
> other CPUs if one is clumsy and doesn't clear the
> flag then the RTI 
> infinite loops right back to your service routine
> and one never gets 
> out of IRQ space back to user space.

yes, the feature is really nice, it is one thing less
to remember.
but, in my case, it won't have been a problem.

   Yann




        

        
                
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