NCS 2.5.0 NRF9160 PM

[Kevin_nik]

Hello,

recently i migrated my code from 1.5.0 to 2.5.0 (it took a lot of effort). and i got confused with power management in 2.5.0.

Apparently, in v2.5.0  CONFIG_PM=y doesn't support Nrf9160. in sample codes for Nrf9160 as long as I add CONFIG_PM=y it won't compile due to this error: 

/home/*/ncs/toolchains/7795df4459/opt/zephyr-sdk/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: zephyr/libzephyr.a(pm.c.obj): in function `pm_system_resume':
/home/*/ncs/v2.5.0/zephyr/subsys/pm/pm.c:152: undefined reference to `pm_state_exit_post_ops'
/home/*/ncs/toolchains/7795df4459/opt/zephyr-sdk/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/12.2.0/../../../../arm-zephyr-eabi/bin/ld.bfd: zephyr/libzephyr.a(pm.c.obj): in function `pm_system_suspend':
/home/*/ncs/v2.5.0/zephyr/subsys/pm/pm.c:240: undefined reference to `pm_state_set'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

I tried to look it up online to find another way to put the device in DEVICE_PM_LOW_POWER_STATE to reduce the power consumption but I couldn't find another way than useing pm_state_force() which needs the  CONFIG_PM.

Any help would be appreciated.

[Achim Kraus]

> in v2.5.0  CONFIG_PM=y doesn't support Nrf9160

Visual Studio warns about that this requires support by the SOC, which seem to be not implemented for the nRF9160.

What works in order to reduce the power on a nRF9160 is

CONFIG_PM_DEVICE=y

with that, you get the 2-3µA quiescent current.

[Vidar Berg]

Hello,

Please refer to the discussion in this thread:  RE: A sample for CAF power manager module . As mentioned there, support for the Power Management subsystem was removed in SDK 2.5.0 since it is not necessary for nRF devices with the automated power management built into the HW.

Best regards,

Vidar

[Kevin_nik]

Thanks for the help.