cpu/stm32l1: add stop and standby modes, adds pm_layered #11158
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Contribution description
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
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 termUnblock using rtc mode 0 and 1 to see effect on current measurement/consumption.
Issues/PRs references