[riot-notifications] [RIOT-OS/RIOT] cpu/kinetis/rtt: clear TPR when writing TSR (#10764)

Thomas Stilwell notifications at github.com
Wed Jan 23 17:18:56 CET 2019


> ```
> # [2018020] Alarm! after 1999919 microseconds (error -81 microseconds)
> # [4017924] Alarm! after 3999823 microseconds (error -177 microseconds)
> # [6017828] Alarm! after 5999727 microseconds (error -273 microseconds)
> # [8017732] Alarm! after 7999631 microseconds (error -369 microseconds)
> ```

It's interesting that the error is incrementing each time, and not by a small amount. I never saw that happen on kw41z. I wonder if the error would continue growing with additional iterations. Was this a coincidence or does it increment every time you test it?

It's unrelated to this PR, but there could be another problem there.

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