RE: nrf9160 psm and eDRX mode Power consumption test

copen — Fri, 07 Aug 2020 01:21:54 GMT

Martin L

I sure spm.conf serial is close and application serial also is close,but I measure measured current is 117ua,Doesn’t the data sheet say it is 7ua? Can there be routines and measured data for this

RE: nrf9160 psm and eDRX mode Power consumption test

Martin Lesund — Thu, 06 Aug 2020 11:34:48 GMT

Hi Copen,

You request from the network:

AT+CEDRXS=2,5,"1011","0000"

However the network grants you another Paging Time Window:

+CEDRXP: 5,"1011","1011","0011"

So eDRX interval is 655,36 seconds and PTW is 10,24 sec.

It is the UART that is drawing the extra current in your case.
You can disable UART simply by the following config in prj.conf:

CONFIG_SERIAL=n

You also need this in the Secure Partition Managers prj.conf file.

Either you can add that configuration directly in /nrf/samples/spm/prj.conf. This will affect all other samples if you build with SPM, so I recommend that you have a separate spm.conf for each project instead.

Here is how you do it:

1. In your projects CMakeLists.txt you add the following

set(spm_CONF_FILE ${CMAKE_CURRENT_SOURCE_DIR}/spm.conf)

right under the line:

cmake_minimum_required(VERSION 3.13.1)

(check the asset_tracker sample as reference)

2. Then make a file called 'spm.conf' in your project folder and add the configurations:

# Configuration copied from the nRF Secure Partition Manager (SPM) sample:
CONFIG_IS_SPM=y
CONFIG_FW_INFO=y
CONFIG_GPIO=n

# Extra Configurations
CONFIG_SERIAL=n

So when you rebuild your project, it will select this spm.conf file and turn of the UART for you.

Then you should get lower numbers.

Best regards,
Martin L