Sleep Modes on the nrf9160 DK

[skipper]

Hi All,

I've just received an nrf9160dk, I'm starting to investigate the development of our application while the hardware guys produce a custom board.  

I'm just starting with the power management and sleep modes for the nrf9160. 
The form of the application is as follows:

Most of the time I want the radio off (no PSM or eDRX), I also want the MPU in its lowest power state, with only the RTC running (no other peripherals are needed in sleep) 
Every 5 minutes I want to power on the MPU and sample a couple of sensors and store the results in EEPROM. 
Every 8 hours I want to power on the radio and send the previously buffered results. 

Our previous-gen product used a ublox SARA tied with UART to an STM32 uC. I've come from an STM32 development background and I'm struggling to find the appropriate function calls in the NRF-SKD that puts the nrf9160 into this deep sleep with the RTC running. 

Any help/guidance/pointers are very much apricahated.  
 

[skipper]

We don't need the UART in sleep, is there any way to de-init the serial peripheral before sleep that has the same effect as setting the CONFIG_SERIAL=n?


Aditionally the LPUART sample provided doesn't compile with the below errors:

3> In file included from C:/Users/josh/ncs/v1.4.0/zephyr/include/arch/arm/aarch32/arch.h:20,
3>                  from C:/Users/josh/ncs/v1.4.0/zephyr/include/arch/cpu.h:19,
3>                  from C:/Users/josh/ncs/v1.4.0/zephyr/include/kernel_includes.h:38,
3>                  from C:/Users/josh/ncs/v1.4.0/zephyr/include/kernel.h:17,
3>                  from C:/Users/josh/ncs/v1.4.0/zephyr/include/init.h:11,
3>                  from C:/Users/josh/ncs/v1.4.0/zephyr/include/device.h:22,
3>                  from C:/Users/josh/ncs/v1.4.0/zephyr/include/drivers/uart.h:26,
3>                  from C:/Users/josh/ncs/v1.4.0/nrf/drivers/serial/uart_nrf_sw_lpuart.c:7:
3> C:/Users/josh/ncs/v1.4.0/zephyr/include/devicetree.h:297:40: error: 'DT_N_INST_0_nordic_nrf_sw_lpuart_BUS_P_label' undeclared here (not in a function)

[Carl Richard]

Hello again, Skipper!

I understand. My bad! You can de-init peripherals during runtime. Given that you don't need printk I suggest using MJD093's approach in this thread.

The developers haven't added support for the non-secure partition of the nRF9160 to that sample from what I can see. It should work if you unzip the attached archive and add the files to the "boards" folder in the sample!

3568.nrf916ns_conf_overlay.zip

Best regards,
Carl Richard