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Forum Index : Microcontroller and PC projects : PM: Watchdog HW question...
| Author | Message | ||||
Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
Hi all.  Just playing with this command, but I cannot make it work - the PM never resets itself. PM firmware version 5.08.00 Code is extremely simple for testing purposes: Print "GO!" Print:Print WatchDog HW 3500 Print 8/0 The code is designed to fall over with a divide-by-zero error - and it does - but the HW watchdog never resets the PM. Standard software watchdog DOES reset the PM, but the HW one does not. Am I doing something wrong? I know the HW watchdog has a limit of 8.3 seconds, so I am not trying to exceed that. Is the manual syntax correct? (page 135) With the standard software watchdog, MM.WATCHDOG is true(1) at reset as you would expect, but using the HW option, as it never resets the PM, MM.WATCHDOG remains false(0). Scratching head......  Smoke makes things work. When the smoke gets out, it stops! |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
ADDITIONAL: I can make the HW version of the command work, so long as I specify the time as 201ms or less, but that is pretty restrictive.  As soon as you specify 202ms or more, the HW watchdog times refuses to work. Smoke makes things work. When the smoke gets out, it stops! |
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phil99 Guru  Joined: 11/02/2018 Location: AustraliaPosts: 2135 |
Yes, replicated, also 5.08.00 > WatchDog HW 3500 : do : pause 9 : ? x : x=9/0 : loop 0 Error : Divide by zero > '--------------------no reboot > WatchDog HW 200 : do : pause 9 : ? x : x=9/0 : loop 0 HW Watchdog timeout However it does work when there isn't an error. > WatchDog HW 3500 : do : pause 9 : loop HW Watchdog timeout |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
It's good that it works inside a running no-error code, but if you get kicked to the console due to a syntax error, it would be nice if that also triggered the HW watchdog in the usual way that the software one does. At least you have proven I am not imagining things!  Smoke makes things work. When the smoke gets out, it stops! |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9115 |
This is how I programmed it. Exiting a program cancels the watchdog. Otherwise in development you ctrl-C out of a program and before you have time to do anything the Pico resets. I could change this but you see the consequence - thoughts? |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6098 |
Watchdog while on the command line would be hell. VK7JH MMedit MMBasic Help |
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Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3194 |
I might have the current behaviour of the PicoMite wrong but it should be: - Exiting the program due to CTRL-C or END should cancel the watchdog. - Exiting for any other reason should leave the watchdog running so it will trigger a restart. - Starting the watchdog at the command prompt should trigger a restart when it expires. The first is a deliberate action by the user/programmer, the second is an issue/fault in the program. The third must be the user testing the command. Geoff Edited 2024-03-07 22:39 by Geoffg Geoff Graham - http://geoffg.net |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9115 |
I'll change it so errors don't cancel the HW watchdog b6 updated with the change Edited 2024-03-08 00:04 by matherp |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
Awesome, thanks.  I'll load up b6 later and try it out. Edited 2024-03-08 07:15 by Grogster Smoke makes things work. When the smoke gets out, it stops! |
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| LouisG Senior Member  Joined: 19/03/2016 Location: AustraliaPosts: 124 |
Hi Grogster, what about the 202ms timeout limit you experienced? Does your application need to work above or below that limit? Am also looking to apply WDTs in my application. ... Louis |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9306 |
Haven't loaded up b6 yet to try it out, but plan to during the weekend. I will let the thread know - I too was curious about that bit, but I figured I can just test it and see what happens, and report if that 202ms timeout is still an issue or not. I have a feeling Peter may have addressed that at the same time. Would not surprise me. Smoke makes things work. When the smoke gets out, it stops! |
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