Bluetooth direct test mode doesnt work for custom board

[NanElv]

Hi, I'm using a custom board with nrf52840, NCS version 2.3.0, zephyr 0.16.0

I'm trying to use the samples/bluetooth/direct_test_mode with the modified rx,tx pin information according to our cutomon board. 

I'm unable to estanblish the communication to the nrf desktop application for the direct test mode. 

I have seen several questions on this, and none of their solution works for me. 

The Desktop can see both the jlink and the USB/UART connections, but i cannot run any test. 

If i use jlink this is the error i'm getting this below given error.

if i use the usb/UART, i get this error

I'm not sure where the issue is, the sample i have tested both by copying into my own custom code, and on its own. I neither see any RTT message on the DTM, nor any serial communication. Any help would be much appreciated. 

Do i have to set anything specific for antenna as in nrf53xxx, in nrf52?

[runsiv]

Hi

In general we recommend testing with the radio test sample, are you able to run it on your custom board? https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/peripheral/radio_test/README.html It gives you a shell where you can adjust your radio parameters. 

I would expect the jlink instance to work so that makes sense to me. As for the DTM I need to investigate 

Regards

Runar

[NanElv]

What is the settings recommended on the radio test for nrf52? I dont see the overlay of the pin input as it was provided in the DTM. I would probably also need the DTM to work. I'm not seeing the UART connected to the JLINK though? how do you do that?

[NanElv]

I couldnt run the radio test too, this is my usb.overlay set based on the custom board. Do i have to set any connection between jlink and the UART on Realterm/Serial connection/putty? for it to work.  As of the hw connection is 

Custom board made with nrf52840 + USB/UART + the nrf DeskTop application. Do i also need additional nrf52840 DK with this?



This is the output i see for the radio test, atleast the DTM was making connection with the FTD, but this one not doing that too. 

[runsiv]

For the radio test sample you will need to use an terminal like for example putty to interface with the device. I don't expect the jlink to have any serial connection to the device, so I would not spend any time to look at that. Are you able to connect to the shell over usb? 

NanElv said:

Custom board made with nrf52840 + USB/UART + the nrf DeskTop application. Do i also need additional nrf52840 DK with this?

You can either test it with another DK or with the RSSI application in nRF Connect for Desktop. 

Regards

Runar

[NanElv]

I could make the nrf52840 + USB/UART + the nrf Desktop Serial connect to read the messages on the UART.  There is just one UART which is also used as J-link. But I could see the output of the RTT on the serial UART.  Is there any process for the Radio test, with the Radio test software, the device is not even recongnised.

also according to this, for bluetooth testing, its not recommended to use the radio test. 

 DTM or Radio Test