Hello,
I'm having trouble implementing a DPI interrupt.

I already have P14I (the default DPI interrupt) allocated to something else. I want an EXT_MISC
signal to interrupt.

I've got the following code to enable the interrupts in the direct method:

bit set mode1 IRPTEN;   //enable global interrupts

bit set imask P13I;
ustat1 = EXT_MISC_1_INT;
dm(DPI_IRPTL_RE) = ustat1;

The SRU has already been set up. I have the following in the IVT:
__P13I :
        jump myISR;   jump (pc,0);   jump (pc,0);    jump (pc,0);

This does not seem to work, as the EXT_MISC signal seems to have no "coded
relationship" to the P13I mask.

I've also tried using the indirect method. This in the main program:

ustat1 = dm(PICR2);
bit clr ustat1 MASKP13;   //Apply settings
bit set ustat1 DPIINT;
dm(PICR2) = ustat1;

bit set IMASK P13I;

This also does not work. However, it seems to have a relationship between the DPI interrupt and
the PICR process (which handles the P13I interrupt).
However, this has no coded relationship between the EXT_MISC signal and the DPI interrupt (how
does the program know which of the interrupt vectors to jump to?)

Anyone have any clue what to do?

Thanks,
David

On Sat, 6 Oct 2007 g...@hotmail.com wrote:

> Hello,
> I'm having trouble implementing a DPI interrupt.
>
> I already have P14I (the default DPI interrupt) allocated to something else. I want an
EXT_MISC signal to interrupt.
>
> I've got the following code to enable the interrupts in the direct method:
>
> bit set mode1 IRPTEN;   //enable global interrupts
>
> bit set imask P13I;
> ustat1 = EXT_MISC_1_INT;
> dm(DPI_IRPTL_RE) = ustat1;
>
> The SRU has already been set up. I have the following in the IVT:
> __P13I :
>         jump myISR;   jump (pc,0);   jump (pc,0);    jump (pc,0);
>
> This does not seem to work, as the EXT_MISC signal seems to have no "coded
relationship" to the P13I mask.

I'm not familiar enough with this processor's guts, but there must be some
way to relate EXT_MISC_1_INT to P13I.  There has to be some other register
which creates the connection.

> I've also tried using the indirect method. This in the main program:
>
> ustat1 = dm(PICR2);
> bit clr ustat1 MASKP13;   //Apply settings
> bit set ustat1 DPIINT;
> dm(PICR2) = ustat1;
>
> bit set IMASK P13I;
>
> This also does not work. However, it seems to have a relationship between the DPI
interrupt and the PICR process (which handles the P13I interrupt).
> However, this has no coded relationship between the EXT_MISC signal and the DPI interrupt
(how does the program know which of the interrupt vectors to jump to?)
>
> Anyone have any clue what to do?

Same thing, there needs to be a way to connect the P13 registers to the
DPIINT registers.  There must be a way to allow level indirection, i.e. P0
-> P15 always have priority 0->15 and you can attach any interrupt to any
level.  I don't have a clue what they would be called, but there must be a
whole suite of registers that tell the process which interrupt goes to
what priority level.

And I could be totally wrong too :-)  It's just a guess and fun on a
saturday afternoon while I wait for laundry....

Patience, persistence, truth,
Dr. mike