[riot-notifications] [RIOT-OS/RIOT] WIP: introduce periph_sleepmem (#11369)

Kaspar Schleiser notifications at github.com
Wed Apr 10 13:29:20 CEST 2019

### Contribution description

Some MCU's offer a couple of registers or memory that retain(s) state even in the deepest sleep mode (when e.g., RAM is not retained). This PR tries to come up with a generic API to make those usable, and an implementation for stm32's RTC backup registers.

While working fine on stm32f4, this is otherwise completely WIP and missing licenses, docs, test application, ...

### Testing procedure

I'd say this is in planning phase, so please check if the API makes sense.

### Issues/PRs references

Briefly discussed backup registers in https://github.com/RIOT-OS/RIOT/pull/11258#discussion_r273891656.
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-- Commit Summary --

  * periph/sleepmem: initial commit
  * cpu/stm32_common: add periph_sleepmem implementation

-- File Changes --

    A cpu/stm32_common/periph/sleepmem.c (59)
    A drivers/include/periph/sleepmem.h (12)

-- Patch Links --


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