Hello,

I want to run a FreeRTOS program on my Netduino plus board which has AT91SAM7X512 microcontroller. I'm working on the ARM7 uIP demo for IAR (uIP_Demo_IAR_ARM7) that's provided with the FreeRTOS source code. I know that this may be an easy question but I have lost too much time trying to do it on my own. I want to be able to handle PIO button interrupts.
The netduino has an onaboard button (PA29) and I want to initialise and handle the interrupts so that when you press the button the onboard LED (PB23) will turn ON.
I want to achieve this using the provided FreeRTOS at91sam7x256 port. I already have it working with the demos which come from the Atmel site but they use a very different port which fails to work together with the FreeRTOS. I want to use the FreeRTOS port because the main goal of the application will be far different from turning LEDs on and off.

Here is my code:
First in board.h I have defined that LED1 is (1 << 23) and SW1 is (1 << 29).
I have the following interrupt handler, which will turn the onboard LED ON:
[code]
void Handler(void)
{
if( AT91F_PIO_GetInput( AT91C_BASE_PIOA ) & LED1 )
{
AT91F_PIO_ClearOutput( AT91C_BASE_PIOA, LED1 );
}
else
{
AT91F_PIO_SetOutput( AT91C_BASE_PIOA, LED1 );
}
}
[/code]

And in the prvSetupHardware function I have added the following:
[code]
AT91F_PIO_CfgInput( AT91C_BASE_PIOA, SW1 );
AT91F_PIO_CfgPullup( AT91C_BASE_PIOA, SW1 );
AT91F_PIO_CfgInputFilter( AT91C_BASE_PIOA, SW1 );

AT91F_AIC_ConfigureIt(AT91C_BASE_PIOA, AT91C_ID_PIOA, 0x07, 0x0, Handler);
AT91F_AIC_EnableIt(AT91C_BASE_PIOA, AT91C_ID_PIOA);

[/code]

And here I am confused about am I initializing the interrupt properly? As long as the button belongs to PA29 I know that I have to use the AT91C_BASE_PIOA when I make the call to AT91F_AIC_ConfigureIt. And here I am not sure about the irq_id parameter. Should it be 29 (as I am using PA29) or should it be AT91C_ID_PIOA? And if its AT91C_ID_PIOA where should I specify that I want to handle intterupts coming from PA29?

Thanks :)

OK... when I read more carefully the sam7x documentation I found that I've made a bunch of mistakes and now it all looks fine but still not working...

The FreeRTOS team told me that I need to configure the SAM7 interrupt and this is not specific to the FreeRTOS stuff.

And here is my code:

[code]
void Handler(void)
{
unsigned int isr = AT91C_BASE_PIOA->PIO_ISR;
if( isr & SW1 )
{
// Button
AT91F_PIO_SetOutput( AT91C_BASE_PIOB, LED1 ); // turn ON
}

AT91C_BASE_AIC->AIC_EOICR = 0; // Clear AIC to complete ISR processing
}

static void prvSetupHardware( void )
{
AT91F_PIO_CfgOutput( AT91C_BASE_PIOB, LED1 );
AT91F_PIO_ClearOutput( AT91C_BASE_PIOB, LED1 ); // turn OFF
AT91F_PMC_EnablePeriphClock( AT91C_BASE_PMC, 1 << AT91C_ID_PIOA );
AT91F_PMC_EnablePeriphClock( AT91C_BASE_PMC, 1 << AT91C_ID_PIOB ) ;

AT91F_PIO_InterruptEnable( AT91C_BASE_PIOA, SW1 );

AT91F_PIO_CfgInput( AT91C_BASE_PIOA, SW1 );
AT91F_PIO_CfgPullup( AT91C_BASE_PIOA, SW1 );
AT91F_PIO_CfgInputFilter( AT91C_BASE_PIOA, SW1 );

AT91F_AIC_ConfigureIt(AT91C_BASE_PIOA,
AT91C_ID_PIOA,
PIO_INTERRUPT_LEVEL,
AT91C_AIC_SRCTYPE_EXT_NEGATIVE_EDGE,
Handler);
AT91F_AIC_EnableIt(AT91C_BASE_PIOA, AT91C_ID_PIOA);
}
[/code]

Is the interrupt initialization code OK?