Lpc2000

It sounds like you have a lot working correctly and the design sounds
basically correct.

 

Are you trying to nest interrupts?  It is safest to not re-arm
interrupts until exiting the ISR.  This defeats some of the advantage of
the VIC - but keeps the software simple.  If you do allow nested
interrupts, you need to push all registers - not just R0-R7.  

 

You say that you end up in the startup code from time to time.  Does the
system continue to run?  Some designs may purposely re-use the startup
code?  Or are you hanging in one of the exception handlers and looping
there?  

 

As for the value written to the VIC, any value can be written. The data
is "don't care" - the act of writing clears the interrupt to the VIC.

 

You might want to also look at the section on Spurious Interrupts in the
LPC/VIC documentation.  The problem occurs with peripherals that have
multiple source encoded into one word.  These are cleared with
non-atomic read/modify/write sequences.  It is possible that a new
interrupt will post after the read.  When written back, the interrupt
will be cleared and missed forever.  This is discussed in the errata
sheet for LPC21xx.

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From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf
Of sengoontoh
Sent: Wednesday, August 03, 2005 6:30 AM
To: lpc2000@yahoogroups.com
Subject: [lpc2000] Interrupts run but main program halts

 

I've a program running interrupts on both UART0 and UART1 as well as a
Match timer interrupt. All interrupts are routed through the VIC with
Timer0 having slot 0, uart0 and uart1 having slot 1 and 2
respectively. When my application starts getting busy with lots of
activity on uart 1 and uart 0, it hangs. The interrupts continue to
work flawlessly. You can even trace through them in IAR. However every
single time I break, I'm in an interrupt handler. Occasionally I'm in
the low level program startup code. Does anyone have any idea what
would cause this behavior.

Also I had a question about resetting the Vic. I'm doing
VicVectorAddres s = 0. I've seen people setting it to 0xff. Which one
is correct?

Thanks!





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