Lpc2000

I have seen this when I have the VIC registers open in a window.  
 
As I recall, the issue is something like this:  When I hit the first
interrupt, another hit while stopped in the IRQ, then reading the VIC in
the debugger clears then pending timer int.  Then no more interrupts.
Generally, I keep the VIC register window closed.

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From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf
Of Marko Panger
Sent: Tuesday, November 15, 2005 6:26 AM
To: lpc2000@yahoogroups.com
Subject: [lpc2000] Breakpoint not stopping timer


Hi all,

I am facing a  strange problem when debugging applications with match
compare timer interrupts enabled.
Hi all,

I have a timer match IRQ which fires every 1ms. Basically a ticker.
Because the timer is used also for other purposes I add a value of
1000 to the timer match register to get the next interrupt after 1ms
(timer clock is 1Mhz). I do also increment a variable in the match IRQ.

I have noticed that if I a put a breakpoint (it doesn't mater where,
IRQ or main loop) the IRQ isn't hit anymore. After playing around I
noticed that when the breakpoint is hit the timer still goes on for
some time, but without hitting the IRQ. Because of this the timer
count register goes ahead of the match register and the match does not
occur anymore. Further I discovered that when single stepping the
global ticker variable is incremented which means that single stepping
takes more than 1ms.

I am wondering that the internal JTAG logic has some flavors or is
this my debugger issue ? Has anybody else noticed such a behavior ?

Regards,
marko






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