[avr-gcc-list] ATmega644 pin-change interrupts

[Per-Tore Aasestrand]

Hi list,

I am using an ATmega644 and is attempting to set up pin-change interrupts
for ports PA4/PCINT4 & PA5/PCINT5. I've used the following code.
Apparently, no interrupts are coming. Any obvious faults?

When in the interrupt handler, how should a decide what pin created the
interrupt? I can't find a flag-bit that carries this
information.

Regards,

Per-Tore

-----------------------------------------------------------------------------------------------

#define

 

        

BSET(p,b)

       

((p) |= 
(1<<b))

        

        

// Set bit
#define

        

BCLR(p,b)

       

((p)
&=
~(1<<b))

        

        

// Clear
bit

...

//-------------------------------
// Initialize External Interrupts
//-------------------------------
void InterruptInit()
{

        

BCLR(SREG,7);

   

        

        

        

        

// Disable Global
Interrupts

        

BCLR(EIMSK,INT0);

       

        

        

        

// Disable
INT0

        

BCLR(PCICR,PCIE0);

      

        

        

        

// Disable
PinChangeInterrupt0

        

// Set
External Interrupt Control Register A to trigger on both edges

        

BCLR(EICRA,ISC01);

      

        

        

        

// ISCn1 = 0

        

BSET(EICRA,ISC00);

      

        

        

        

// ISCn0 = 1

        

        

// Enable
Pin Change Interrupts

        

BSET(PCICR,PCIE0);

        

BSET(PCMSK0,PCINT0);

        

BCLR(EIFR,INTF0);

       

        

        

        

// Clear INTF0
Flag

        

BSET(EIMSK,INT0);

       

        

        

        

// Enable
external interrupt INT0

        

BSET(SREG,7);

   

        

        

        

        

// Enable Global
Interrupt

} // InterruptInit()


//---------------------------
// External Interrupt handler
//---------------------------
ISR(INT0_vect)
{

        

// Detect
were interrupt came from (PA4 or PA5)

        

...
}

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