Hi
I have looked at the examples on the AT91SAM7S-EK Cd, and is having trouble with getting interrupts on more than 1 normal PIO pin. In the example an interrupt routine is made for SW4 (PA14), and it is enabled by PIOA on the AIC. How can i make a interrupt routine for lets say PA15 and still have the interrupt on SW4 ?

Regards Brian Nielsen

Hi Brian,

>example an interrupt routine is made for SW4 (PA14), and it is enabled >by PIOA on the AIC. How can i make a interrupt routine for lets say PA15 >and still have the interrupt on SW4 ?

To get pin-change INTs, the following needs to be done :
( SW1 = PA19, SW2 = PA20, SW3 = PA15, SW4 = PA14)

For each pin, write a 1 to PIOA_PER.
For each pin, disable outputs with PIOA_ODR .
For each pin, set proper bits in :
PIOA_MDDR, PIOA_IFER, PIOA_PUER

Make sure you enable the PIOA Per. clk in PMC_PCER

Enable the INTs for it in PIOA_IER

Assign a ISR vector, the handler for Port pin change.

clear spurious INTs with AIC_ICCR

And then enable the PIOA Per ID INTs in AIC.

so equates would be :
#define SW1 (1<<19)
etc.....

To enable interrupts on SW3 and SW4 :

PIOA_PER = SW3 + SW4;
PIOA_ODR = SW3 + SW4;
PIOA_MDDR = SW3 + SW4;
etc.....

That's it !

Thanks Microbit
It works.
I can now trig the same int. routine with several PIOs.
Just to take it a bit further:
How can i make it so that SW4 keeps its int routine, and make a new int. routine for SW3 ?
So they have an int. routine each. ?
(The inline function AT91F_AIC_ConfigureIt requires AT91C_ID_PIOA. And i cant use that for both routines or can I ?)


Regards Brian Nielsen