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???
03/11/10 14:00
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 		 #173991 - Unlikely to be "random"
Responding to: ???'s previous message
Baptiste Pomechicot said:
I'm sure to not feed the watchdog in an infinite loop. I activate it on the first instruction of my main() and I never disable it in my soft.

You mean you never intentionally disable it in your software?!

Clearly something is wrong - so how can you be sure that the "something" doesn't include disabling (possibly inadvertently) the watchdog?

That's precisely why Kai said that a watchdog that can be enabled/disabled by software is such a Bad Idea!

The other possibility, as I've said before, is that you scheme for "feeding" the watchdog is flawed and allows the software to keep "feeding" it while it is in this "fozen" state...

It's realy random...

No, I very much doubt that it is random at all; there is almost certainly a direct cause - the tricky bit is to find that cause...

Quite possibly, something is "marginal" so, for one board it is just "close enough" to work - but the other board is just far enough out for you to see it failing occasionally...

Or you have some other fault on the board (possibly an intermittent fault), and your software does not correctly handle the results of that fault - but ends up in this "frozen" state.

Again, just because you haven't seen the problem in the other board(s) doesn't mean that it isn't there waiting to bite you when just the "wrong" set of conditions conspires to happen together...

List of 55 messages in thread
TopicAuthorDate
Micro freeze            01/01/70 00:00      
   I don't understant how micro can freeze            01/01/70 00:00      
   Hang-up or lock-up?            01/01/70 00:00      
   details            01/01/70 00:00      
      You didn't answer the question            01/01/70 00:00      
      Oops, no good at all!            01/01/70 00:00      
      I think what Kai meant was /EA not EW            01/01/70 00:00      
         No, I meant the /EW pin            01/01/70 00:00      
   RST Watchdog            01/01/70 00:00      
      Add diagnostics            01/01/70 00:00      
         That's a good plan ... IF ...            01/01/70 00:00      
            Useful, but not essential            01/01/70 00:00      
               His problem, however ...            01/01/70 00:00      
                  Sorry - missing the point            01/01/70 00:00      
   more details            01/01/70 00:00      
      Don't jump to conclusions            01/01/70 00:00      
         test suggestions            01/01/70 00:00      
            Unlikely to be "random"            01/01/70 00:00      
            Assume nothing! Be very meticulous in your observations            01/01/70 00:00      
               somes evidences            01/01/70 00:00      
                  /EW not /WE!            01/01/70 00:00      
                     /EW not /WE            01/01/70 00:00      
                        that was my confusion, not yours ...            01/01/70 00:00      
                           The Watchdog does not "find" anything            01/01/70 00:00      
                              feed the dog            01/01/70 00:00      
                                 watchdog management            01/01/70 00:00      
                                 Many ideas out there . . .            01/01/70 00:00      
                              Certainly, but it responds to a missing "kick"            01/01/70 00:00      
                                 True, but            01/01/70 00:00      
                                    One simple diagnostic tool            01/01/70 00:00      
                     Oops! Begging your pardon ...            01/01/70 00:00      
   logic analyzer            01/01/70 00:00      
      Could be tricky...            01/01/70 00:00      
         someone doesn't want him to fix it            01/01/70 00:00      
            It isn't clear...            01/01/70 00:00      
         "potted" = what?            01/01/70 00:00      
            got it: "potted" = "drowned in resin"            01/01/70 00:00      
               potting SMD components            01/01/70 00:00      
   Limit Watchdog feed            01/01/70 00:00      
      I would like to write a more suitable code for this algorith            01/01/70 00:00      
         Keil example            01/01/70 00:00      
            The point is...            01/01/70 00:00      
      feed the watchdog in main loop            01/01/70 00:00      
         Non blocking loop            01/01/70 00:00      
            nothing impossible            01/01/70 00:00      
               Breaks on vacation?            01/01/70 00:00      
                  oops            01/01/70 00:00      
            Not at all!            01/01/70 00:00      
               big enought            01/01/70 00:00      
                  Both!            01/01/70 00:00      
                     re both            01/01/70 00:00      
                        You misunderstand            01/01/70 00:00      
         where to feed watchdog            01/01/70 00:00      
            You misunderstand            01/01/70 00:00      
            Watchdog kick in interrupts can often fail badly            01/01/70 00:00      

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