[riot-notifications] [RIOT-OS/RIOT] cpu/atmega_common: RTT and RTC support (#8842)

ZetaR60 notifications at github.com
Fri Apr 19 08:30:14 CEST 2019

I have made some alterations: volatile is reduced to what is necessary for proper integrity (`rtt_state.ext_cnt` and `rtt_state.time` only now). A new inline function `_safe_cnt_get()` uses volatile to safely get by re-checking. And, I brought in `irq_disable()` and `irq_restore()` to replace the requirement for a specific callback assignment order. I will work on testing this code tomorrow.

@maribu I re-read my earlier comments, and I feel that at least one comes off as being quite abrasive.  That was not my intention, and I apologize if you found it unpleasant. It is difficult to convey that sort of non-literal meaning in a purely textual medium. I do appreciate that you are taking time to review my code.

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