[riot-notifications] ***UNCHECKED*** Re: [RIOT-OS/RIOT] sam0: Implement watchdog driver (#11520)

benpicco notifications at github.com
Fri Sep 13 11:39:22 CEST 2019

Rebased, now that #11252 is merged.

I dropped my own `tests/periph_wdt` in favor of the one from @fjmolinas 

However, the test will always fail:

PASSED target time: 100.0[ms], actual_time: 127.561[ms]
PASSED target time: 500.0[ms], actual_time: 502.736[ms]
PASSED target time: 1000.0[ms], actual_time: 999.896[ms]
FAILED target time: 5000.0[ms], actual_time: 7984.307[ms]

The result is the same on samr21-xpro and same54-xpro.
This is because the Watchdog only has 4 bits for window and period respectively.
Only powers of 2 can be configured, so for 5000ms the next power of two (8192/1024Hz = 7938.48 ms) is selected.

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