Philippe Teuwen 2cbe43f269 clarifications and minor changes in slow clock related operations: ...

* SpinDelay and SpinDelayUs: now rounding applies instead of truncating
* Document maximum duration of SpinDelay/SpinDelayUs/BUTTON_CLICK/BUTTON_HELD
* Add argument check against max duration in SpinDelay/BUTTON_CLICK/BUTTON_HELD
* Document why these functions don't need to take wrapping into acount as in GetTickCountDelta
* Use >= in the spinning loops
* Clarify StartTickCount calibration operations and use masks AT91C_CKGR_MAINRDY and AT91C_RTTC_RTPRES

2019-08-06 13:09:48 +02:00

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