Lpc2000

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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