Contribution description

This PR moves the pm commands from tests/periph_pm' to a shell command module pm_cmd to make them available for embedding in other applications, e.g. for debugging by using

USEMODULE=pm_cmd BOARD=... make -C tests/shell

The test application tests/periph_pm now uses the shell command module instead of defining the pm commands by itself.

Dependent on module pm_layered and feature periph_rtc the following commands are available:

off		turn off
reboot		reboot
set		set power mode
block		block power mode
unblock		unblock power mode
unblock_rtc	temporary unblock power mode

The set, block, unblock commands are available if the platform supports pm_layerd. The unblock_rtc is only available if the platform support pm_layered and feature periph_rtc.

Testing procedure

Compile and flash tests/periph for a board with periph_rtc feature, for example

make BOARD=nucleo-f411re -C tests/periph_pm flash term

and excute the following tests:

• Set mode 1

  > rtc gettime
  2020-03-22 16:30:18
  > rtc setalarm 2020-03-22 16:30:40
  > pm set 1
  CPU will enter power mode 1.
  ...
  > 
  

• Set mode 1

  rtc setalarm 2020-03-22 16:31:50
  > 
  > pm set 0
  CPU will enter power mode 0.
  .main(): This is RIOT! (Version: 2020.04-devel-1400-g5aff3-sys/shell/pm_cmd)
  test_shell.
  >
  

• Unblock mode 1 for 5 seconds

  > pm unblock 1 5
  

• Reboot with pm command

  > pm reboot
  

• Power off pm command

  > pm off
  

Issues/PRs references