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add hardware watchdog feature (implementation using the attiny watchdog)#4

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fyhertz wants to merge 2 commits intouugear:masterfrom
upciti:watchdog2
Open

add hardware watchdog feature (implementation using the attiny watchdog)#4
fyhertz wants to merge 2 commits intouugear:masterfrom
upciti:watchdog2

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@fyhertz
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@fyhertz fyhertz commented Jan 17, 2020

When this feature is enabled, if the pi fails to reset the watchdog timer, a full power cycle is triggered.
Setting i2c register 0x10 to a non-zero value enables the feature, sets the watchdog timeout and clears the watchdog timer.

- the Dockerfile contains all required dependencies
- firmware patch: c++ doesn't allow forward declaration
When this feature is enabled, if the pi fails to reset the watchdog timer, a full power cycle is triggered.
Setting i2c register 0x10 to a non-zero value enables the feature and sets the watchdog timeout.
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