Re: [ECOS] Problem reading buttons on AT91sam7s-ek

["Rasmus Stougaard" <stou.nospam@gmail.com>]

> >   // Enable the clock to the GPIO (enable input sampling)
> >   HAL_WRITE_UINT32(AT91_PMC + AT91_PMC_PCER, AT91_PMC_PCER_PIOA);
>
> You only need to enable the clock once. You could move this outside of
> the read function.

Ok thanks again, will do that. I also plan to convert my example to a
macro, to save the overhead of making the function call.

>
> Maybe i should add a macro to var_io.h to enable/disable the clock?

That might be a good idea, or add a comment to
HAL_ARM_AT91_GPIO_CFG_DIRECTION
and
HAL_ARM_AT91_GPIO_GET
stating that the clock must be enabled to receive inputs. At least it
was not obvios to me, and others might benefit too :-)

By the way can you point me to an example/documentation of how to use
HAL_ARM_AT91_GPIO_CFG_INTERRUPT

I want to setup the buttons to generate interupts for handling user input.
I have found some domentation of how to set up ISR and DSR using
cyg_interrupt_create().

However, I can figure out how to map a GPIO pin to trigger the interrupt vector?

Cheers
Rasmus

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