Re: Installing ISR for Interrupt 5

Chris Musial wrote:
> I'm trying to install a handler for Interrupt 5 and am ending up hanging my
> machine when the interrupt gets generated.  I'm also installing a handler for
> Interrupt 1 and this 1 is working OK, so I'm pretty sure I have the overall flow
> right.  I think my problem is that Interrupt 5 is shared by the 1-wire master
> bus and I can't find the documentation for turning off those interrupts.  The
> documentation says I need to use OWMAD and OWMDR to turn off the EOWMI bit, but
> I can't find anywhere that tells me where that bit is, or if there's anything
> else I need to do.  I did infer that the control register is used to turn it
> off, but there must be something else.  Here's my interrupt installation code:


Look in the DS80C400 Datasheet.  The DS80C400 user guide does not have 
the complete info on the 1-Wire master.  EOWMI is defined as bit 7 of 
the control register.

> The routine to install the interrupt returns success (it would return 4 if this
> installation failed).  Right now, the ISR is empty - just an IRET instruction,
> but the board hangs as soon as the interrupt is generated.  As I said, my
> handler for interrupt 1 is working, but (a) - interrupt 5 is shared with
> interrupts 2-4, and (b) it is multiplexed with the 1-wire bus.  Is there
> anything else I need to do when installing int 5?

Make sure to clear EXIF.7 (IE5), the /INT5 flag bit, before you reti out 
of your ISR.  I think the interrupt is continuously firing.

BTW, the 1-Wire code in TINIOS does not use interrupts so your code is 
safe from 1-Wire interrupts.


-- 
--
Bryan Armstrong
bryan.armstrong-6tN4nzCoH/[email protected]


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