[riot-notifications] [RIOT-OS/RIOT] cpu/stm32f7: add STOP and STANDBY low-power modes (#11178)

Alexandre Abadie notifications at github.com
Thu Mar 14 11:14:25 CET 2019

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### Contribution description

This PR adds STOP and STANDBY low-power modes for stm32f7 and is based on #9521 and #11173 for simplicity.

I tested it on nucleo-f746zg and got good results (looks valid compared with datasheet):
- standby: ~7uA
- stop: 2mA

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- describe which part(s) of RIOT is (are) involved
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### Testing procedure

- Build an flash `tests/periph_pm` on a nucleo-f746zg
- Plug a multimeter on the IDD pins in Amper mode measurement
- Switch to STANDBY mode:
> unblock 0
> unblock 1
> unblock_rtc 1 5
You should see a drop of consumption from 38mA to 7uA. After 5 seconds, the board reboots.
- Switch to STOP mode:
> unblock 1
> unblock_rtc 1 5
You should see a drop of consumption from 38mA to 2mA

Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
- how to know that it was not working/available in master
- the expected success test output

### Issues/PRs references

Based on #11173 and #9521 

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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resolved, this way they will be automatically closed when your pull request
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-- Commit Summary --

  * cpu/stm32f0: add periph_pm support
  * cpu/stm32_common: implement low-power modes for L4
  * cpu/stm32l4: use pm_layered module
  * cpu/stm32_common: implement low-power modes for F7
  * cpu/stm32f7: use pm_layered module

-- File Changes --

    M cpu/stm32_common/include/periph_cpu_common.h (8)
    M cpu/stm32_common/periph/pm.c (146)
    M cpu/stm32f0/Makefile.include (2)
    M cpu/stm32f7/Makefile.include (2)
    M cpu/stm32l4/Makefile.include (2)

-- Patch Links --


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