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Is there any way to reset the processor from within the firmware? I am currently using the Watchdog feature, and I know if I stop toggling the watchdog then my processor will time out and reset. However, I need to be able to do different things depending on the 'cause' of the reset... ie if its a watchdog timeout that caused reset I need to do X,Y,Z before normal operation but if its a software triggered reset (eg after I have updated a parameter or something in flash) then I only want it to do Y,Z Obviously I could use some external hardware, however is there any way to do it in software???? any help is appreciated! cheers, pete |
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LPC Reset..
Started by ●October 7, 2004
Reply by ●October 10, 20042004-10-10
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On 7 Oct 2004 at 15:05, bty639886 wrote: > > > Is there any way to reset the processor from within the firmware? > > I am currently using the Watchdog feature, and I know if I stop > toggling the watchdog then my processor will time out and reset. > > However, I need to be able to do different things depending on > the 'cause' of the reset... > > ie if its a watchdog timeout that caused reset I need to do X,Y,Z > before normal operation but if its a software triggered reset (eg > after I have updated a parameter or something in flash) then I only > want it to do Y,Z > > Obviously I could use some external hardware, however is there any way > to do it in software???? > What I have done in the past is to have a 32bit value in a portion of RAM which is not initialised by the C startup code. (If you have any). I then write a specific value into this address, before I cause a deliberate watchdog reset. After a reset one can then check the value. If it is the special value, then it was a "Software Reset" otherwise it was a watchdog reset. Regards Anton Erasmus -- A J Erasmus |
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Reply by ●October 11, 20042004-10-11
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thanks very much, I will give this a try, kind regards pete --- In , "Anton Erasmus" <antone@s...> wrote: > On 7 Oct 2004 at 15:05, bty639886 wrote: > > > > > > > Is there any way to reset the processor from within the firmware? > > > > I am currently using the Watchdog feature, and I know if I stop > > toggling the watchdog then my processor will time out and reset. > > > > However, I need to be able to do different things depending on > > the 'cause' of the reset... > > > > ie if its a watchdog timeout that caused reset I need to do X,Y,Z > > before normal operation but if its a software triggered reset (eg > > after I have updated a parameter or something in flash) then I only > > want it to do Y,Z > > > > Obviously I could use some external hardware, however is there any way > > to do it in software???? > > > > What I have done in the past is to have a 32bit value in a portion of RAM which is not > initialised by the C startup code. (If you have any). I then write a specific value into this > address, before I cause a deliberate watchdog reset. After a reset one can then check > the value. If it is the special value, then it was a "Software Reset" otherwise it was a > watchdog reset. > > Regards > Anton Erasmus > -- > A J Erasmus |
