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Netduino Plus 2 - Watchdog


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#1 mhstr


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Posted 19 May 2014 - 08:39 PM



I am new here and we would like to use Netduino as a replacement of previous control board based on the x51 platform in some commercial application(dozens...hundreds pieces). The application must run 365/7/24 without human assistence.


Becuase of reliabilty the hw Watchdog is I would say a must(it is also used in current system). I have read in some other tread that there was a plan to support HW Watchdog in the firmware(somewhere in 2012) but I have such a filling that Watchdog is still not supported but I am not sure.


I am asking becuase I have also read some other thread which mentioned that Netduino Plus 2 application was frozen because of some problem with network initialization(DHCP) where some part of Flash memory is overwritten too frequently or something like that...


Chris has recommended to use some external hw circuit as a Watchdog but this is not an elegant solution and it leads to a problem when bootloader is activated as bootloader does not know anything about external Watchdog the "burning process" would be interrupted...


And also Watchdog would be an elegant solution how to make a real HW reset e.g. during remote update procedure.



Thanks for any idea.




#2 dino4net


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Posted 21 May 2014 - 11:30 AM


I just try to use the MAX6371 as an external watchdog. It's small and not a lot of components are required.

It works perfect in the moment when the max6371 is powered by battery, but not from the Netduino ...


The MAX6373 has a function to wait until it get's a first pulse before it's activated.

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