Lpc2000

Hi,

This could be also a good marketing point. None of the vendors pointed out this when I way buying my JTAG emulator + SW debugger. 

If the debugger doesn't support this feature debugging become very hard and tricky if not impossible.

Thanks,
marko

> 
> Od: Michael Johnson <mpj@...>
> Datum: 2005/11/16 Sre AM 04:21:19 CET
> Za: lpc2000@yahoogroups.com
> Zadeva: Re: [lpc2000] Breakpoint not stopping timer
> 
> Marko Panger wrote:
> 
> >Hi,
> >
> >Thanks for your reply. Could you explain me what do you mean by
> >"When a debugger backtraces off the end of the callstack"
> >  
> >
> For a debugger knowing when to stop backtracing (generating the function 
> calls) can be problematic - particularly in multi threading environments.
> 
> >I don't get it very well. Anyway I have to check how to disable this in 
> >my debugger.
> >
> >  
> >
> This could be difficult if not impossible - it's worth talking to the 
> vendor of your debugger to see if this could be happening to you.
> 
> Regards
> Michael
> 
> >Regards,
> >marko
> >
> >  
> >
> >>Hi Marko,
> >>
> >>When a debugger backtraces off the end of the callstack it may 
> >>unwittingly reference peripheral registers - could you be affected by 
> >>this? We've stopped CrossStudio accessing peripheral registers when 
> >>backtracing to handle this case.
> >>
> >>Regards
> >>Michael
> >>
> >> 
> >>
> >>    
> >>
> >>>Hi,
> >>>
> >>>I am aware that reading periphery in some windows could clear some flags, but I don't have any "periphery window" opened....
> >>>
> >>>marko
> >>>
> >>>
> >>>
> >>>   
> >>>
> >>>      
> >>>
> >>>>Od: "Dan Beadle" <dan.beadle@...>
> >>>>Datum: 2005/11/15 Tor PM 04:06:02 CET
> >>>>Za: <lpc2000@yahoogroups.com>
> >>>>Zadeva: RE: [lpc2000] Breakpoint not stopping timer
> >>>>
> >>>>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.
> >>>>
> >>>>_____  
> >>>>
> >>>>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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