NRF5340 direct test mode example project failed to set the tx power.

[Alex_Li]

I used this direct test mode sample project:  "ncs\v2.6.1\nrf\samples\bluetooth\direct_test_mode"

I can connect and test it normally on the nRF5340 development board with the comprehensive

test instrument through the serial port, but after I added Bluetooth's default launch power settings,

it cannot be connected to the integrated test instrument :

set the BLE default tx power in the  direct_test_mode\boards\nrf5340dk_nrf5340_cpunet.conf  as follow:

CONFIG_BT=y
CONFIG_BT_CTLR=y
CONFIG_BT_CTLR_TX_PWR_PLUS_3=y

When I compile the firmware burning to the development board and

connect the comprehensive test instrument through the serial port,

the RTT Viewer printing information of NetCore is as follows

"UART device not ready"

 

“Error initializing DTM transport: -5”

The following is the project directory I added to the configuration：

8637.direct_test_mode.zip

Trouble point out whether the configuration I add conflicts with the function of

this project. My purpose is to set a fixed launch power on the basis of this

Direct Test Mode routine.

[Håkon Alseth]

Hi,

 

DTM is a standalone application, and you should not add BT specific kconfigs to this project.

To change the TX power to for instance, you can alter this initial value:

https://github.com/nrfconnect/sdk-nrf/blob/v2.6.1/samples/bluetooth/direct_test_mode/src/dtm.c#L401

to "RADIO_TXPOWER_TXPOWER_Pos3dBm"

 

This will alter the default tx power to be +3 dBm on your project.

 

Kind regards,

Håkon

[Alex_Li]

Hi,Håkon:

    Thanks for your reply and suggestions. After removing the BT enable and performing this modification,

the transmit power change can be detected on the integrated test instrument.

Kind regards,

Alex

[Håkon Alseth]

Hi Alex,

 

I am glad to hear that it is working as expected. Hope you have a wonderful day!

 

Kind regards,

Håkon