[riot-notifications] [RIOT-OS/RIOT] Pr stm32l1 pm (#11359)

Francisco notifications at github.com
Mon Apr 8 19:04:00 CEST 2019

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
you to make sure that your modifications are compliant with the RIOT
coding conventions, see https://github.com/RIOT-OS/RIOT/wiki/Coding-conventions.

### Contribution description

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- describe which part(s) of RIOT is (are) involved
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This PR is based on previous work in #8403 & #10052. On start-up it configures all GPIO's as AIN.
On other boards of the STM32L family (L0 & L4) this is done by default.

As stated in this [AN](https://comm.eefocus.com/media/download/index/id-1013834), doing this saves the consumption of the input Schmitt trigger. The only case where this shouldn't be done is when the pin is connected to an external driver that has a pull-up or pull-down setting, this should be handled by pertinent drivers.

### Testing procedure

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As of know when entering STOP mode consumption on stm32l1 is around 500uA, with this PR it drops to 1.5uA. To test run:

`make BOARD=nucleo-l152re -C tests/periph_pm/ flash`

NOTE: on nucleo boards if power is measured directly after programming there will be around 200uA of current consumption coming from the stlink. The stlink must start without being connected to the board or power the board externally.

### Issues/PRs references

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

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Based on work from #8403 & #10052. Depends on #10051 or #11358.
You can view, comment on, or merge this pull request online at:


-- Commit Summary --

  * cpu/cortexm_common: function to check address validity
  * cpu/stm32_common: minimize consumption on STM32L1
  * cpu/stm32_common: preserve JTAG pins on L1

-- File Changes --

    M cpu/cortexm_common/cortexm_init.c (47)
    M cpu/cortexm_common/include/cpu.h (11)
    M cpu/cortexm_common/vectors_cortexm.c (18)
    M cpu/stm32_common/cpu_init.c (39)
    A tests/cpu_cortexm_address_check/Makefile (16)
    A tests/cpu_cortexm_address_check/README.md (12)
    A tests/cpu_cortexm_address_check/main.c (65)

-- Patch Links --


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