can't find board nrf52833dk_nrf5283 in bluetooth DTM sample

[christopheMon]

Hello,

I have a project in Visual studio code and Nrf connect.

MCU is a NRF 52833.

For the certicications, the lab request me the DTM mode.

I tried the use the Sample - Direct-test-mode Firmware

However I'm not able to find eht board "nrf52833dk_nrf5283" in the NCS folder.

I tried to install several SDKs (2.2.0 / 2.3.0 / 2.4.2 / 2.7.0 / 2.9.2 / 3.2.4 ) but none includes the 833 board. I can find and compile with the 840, but no options for the 833.

Please can sombody help me ? I need to use and compile the DTM for the 52833.

Thanks in advance

[Kenneth]

Hi,

If you choose Nordic Kits you can build for nRF52833dk like this:

But I assume you are not using direction finding, so you need to disable it by either adding to app.overlay:

&radio {
	/delete-property/ dfe-supported;
};

Or build as described here: 
https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/bluetooth/direct_test_mode/README.html#disabling_direction_finding_feature 

Kenneth

[christopheMon]

hello, thanks for your reply, however, with the Nordic Kit selection, (and not the Compatible), impossible to compile the code...

I can compile selecting the nRF52840 only...

how to get just a simple code for DTM for the 833 ?

Also don't you have example with the USB communication ?

I can't understant how all people using nrf devices have to certificate them then every body have to use the DTM too... nothing is proposed for this ? I mean PC software - USB control and DTM for most nrf devices ?

So in my case, I need to create a new board to use with the DTM as the 52833 is not available...right ?

[christopheMon]

Hello Kenneth, 

The FW radio test is compiling, and running on my PCB, It seems working and receiving some data, but I cannot use it as it has simplified commands.

The FW DTM sample is compiling, and running on my PCB, but I cannot receive frames (1 sending and the other receiving) as described before in my posts. However, it seems that DTM sample also has simplified commands.

The certification LAB requested me to implement the standard DTM mode, and as I read, the standard DTM is controled by Opcode HCI (Bluetooth SIG)

Then both are not accepted by the LAB.

What FW can I use ? I saw the serial HCI that can communicate in HCI and control the BLE...?

Is this used by the labs ?

[Kenneth]

Hi,

I have compiled \v3.2.0\nrf\samples\bluetooth\direct_test_mode with the attached boards files:

1588.nrf52833dk_nrf52833.overlay
nrf52833dk_nrf52833.conf

To test with your hardware I added some wires to a DK:

Then I tested with the DTM app in nRF Connect SDK for Desktop:

Hope that helps,
Kenneth

[christopheMon]

ok thanks for your replay, please can you confirm that this direct_test_mode is communicating with protocol HCI ? 

As you can see the LAB request on my link : https://cdn.rohde-schwarz.com.cn/pws/dl_downloads/dl_application/application_notes/1c105/1C105_1e_Bluetooth_LE_DirectTestMode.pdf

[Kenneth]

This should work with the "Through a 2-wire UART interface for EUTs with non-accessible host controller interface" I can find in the document.

Kenneth

[christopheMon]

Yes but I have the 2 wire UART, then it should be ok for the hardware, the LAB is requestion me by mail that they want the "please prepare your EUT for HCI control and prepare with a USB adapter that we have the possibility to communicate with our equipment"

I will use an FTDI cable , but then need to access by HDI protocol...

using "HCI_UART" sample will it be ok ?

[Kenneth]

Hello,

I would have asked if they can use the 2-wire, since it's supported by the R&S equipment.

https://devzone.nordicsemi.com/f/nordic-q-a/125811/nrf54lm20a-question-about-hci_le_transmitter_test 

Kenneth 

[christopheMon]

LAB is clear and ask us for HCI commands over UART or USB... As I understand, HCI is the protocol over the 2 wires UART right ?

When you talk about 2 wire, are you talking about your simplified opcode control also over uart ?

I can't imagine nobody aready certified your BLE chip ? what do they all use for labs ?

[Kenneth]

For regulatory testing (FCC, ETSI etc) they use either radio test or the 2-wire DTM.

From the Bluetooth core spec it says:

"Direct Test Mode shall be set up using one of two alternate methods:

1. over HCI (as defined in Section 2) or

2. through a 2-wire UART interface (as defined in Section 3)"

https://www.bluetooth.com/wp-content/uploads/Files/Specification/HTML/Core-61/out/en/low-energy-controller/direct-test-mode.html 

Kenneth

[christopheMon]

Hello,

After checking with LAB, they will accept to use the Direct test mode.

I will check if it works 100% on my side

[Kenneth]

That was good news! I hope there are no problems now.

Kenneth