wiktorkwiatkowski opened a new pull request, #3475:
URL: https://github.com/apache/mynewt-core/pull/3475
This commit adds watchdog timer support for Apollo2-based boards. Apollo2
microcontrollers allow selecting different WDT clock frequencies. To enable
this feature, a new configuration variable is introduced: `AM_WATCHDOG_CLOCK`.
You can set `AM_WATCHDOG_CLOCK` to one of the supported values:
- 1 (default)
- 16
- 128
The clock affects how long the watchdog timeout can be, since the hardware
register for reset timeout is 8 bit.
This means:
- for 128Hz, max timeout ~ 2 seconds
- for 16Hz, max timeout ~ 16 seconds
- for 1Hz, max timeout 255 seconds
If you choose a higher clock, you must decrease the interval values
accordingly. Two other config variables should be adjusted based on the
selected clock:
- SANITY_INTERVAL
- WATCHDOG_INTERVAL
Example for syscfg.yml in an app or target:
```
syscfg.vals:
AM_WATCHDOG_CLOCK: 16
SANITY_INTERVAL: 1000
WATCHDOG_INTERVAL: 5000
```
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