[riot-notifications] [RIOT-OS/RIOT] cpu/stm32l1: add stop and standby modes, adds pm_layered (#11158)

Francisco notifications at github.com
Tue Mar 12 10:03:59 CET 2019


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### Contribution description

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This PR adds low power modes STOP and STANDBY for stm32l0 boards. Achieves 100mA on STOP mode. For lower power consumption GPIO must be switched to AIN on startup, this is left for a different PR.

### Testing procedure

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Connect a multimeter or other current measuring device on IDD pin on nucleo-l152re boards, then run:

`make BOARD=nucleo-l152re -C tests/periph_pm/ PORT=/dev/ttyACM0 flash term`

Unblock using rtc mode 0 and 1 to see effect on current measurement/consumption.

### Issues/PRs references

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You can view, comment on, or merge this pull request online at:

  https://github.com/RIOT-OS/RIOT/pull/11158

-- Commit Summary --

  * cpu/stm32_common: wait for flash to be ready in init_sysclk
  * cpu/stm32l1: add support for STOP & STAND_BY mode

-- File Changes --

    M cpu/stm32_common/include/periph_cpu_common.h (3)
    M cpu/stm32_common/periph/pm.c (29)
    M cpu/stm32_common/stmclk_l0l1.c (4)
    M cpu/stm32l1/Makefile.include (2)

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/11158.patch
https://github.com/RIOT-OS/RIOT/pull/11158.diff

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