Eric ,
As Mike suggested , first you need to check whether ISR is properly
configured properly , mapping the GPIO event to HWI interrupt .
Step 1 - Configure GPIO pins for proper mode ( input mode ) & appropriate
interrupt mode - either rising edge or falling edge . Also enable the
register to trigger interrupt ( BINTEN )
Step 2. - Register interrupt handler .
every GPIO bit interrupt is mapped to particular event number
- eg Pin 0 to event number 45 , Pin - 46 ( in C6482 , check the appropriate
in 6416 )
Next , map this event to HWI interrupt required with ISR
funcion required and enable that HWI .
Above description is based on C6482 , hope its same for 6416 ...
- Jai
On Thu, Oct 9, 2008 at 1:29 PM, Michael Dunn wrote:
> Eric,
>
> On Wed, Oct 8, 2008 at 4:53 PM, snuzzbff
>
> wrote:
> > I have a 6416 DSK that I'm trying to enable an interrupt to the
> > processor on one of the EXTINT pins. Right now I'm flipping bits in
> > the CPLD CTRL registers to cause an interrupt.
> >
> > I've looked at the GPIO and Interrupt registers in CodeComposer and
it
> > appears the interrupt is registering (bits that need to be 1 or 0 are
> > set appropriately). However when I set a break point in the actual ISR
> > I never reach it.
> >
> > I've gathered from some of app notes, documentation, and posts that
I
> > need to probably use functions from csl_irq.h but of course haven't
had
> > any luck. Also have tried to use the vector.asm file from
Chassaing's
> > book as a reference but I'm not sure whether I need that file in the
> > project or not (and if so how to alter it).
>
> Hmmm... this part sounds serious.
> Do you know how interrupts work on the c6x??
> You definitely need vector.asm or an equivalent file.
> Have you ever wondered how an interrupt would find its ISR??
> By default the int vectors begin at address 0.
> The interrupt vector address [where execution begins after an int] >
int_number << 5. For example, if you are using int 10 [0x0A], the
> address would be 0x0A << 5 or 0x140. You have 8 words to put a branch
> to your ISR in assembly [there is probably an example in vectors.asm -
> you just need to understand it].
> Make sure that you get all of the mapping from the HW pin to the int
> straight. If you saw the int in the IFR, you probably do.
> Make sure that ints are enabled [GIE] and that your specific int is
> enabled [IER].
>
> mikedunn
> >
> > Any tips/hints/help is appreciated. Thanks.
> >
> > - Eric
> >
> > --
> www.dsprelated.com/blogs-1/nf/Mike_Dunn.php
>
>