Direct Test Mode (DTM) Response

RE: Direct Test Mode (DTM) Response

Jimmy Wong — Wed, 06 May 2020 03:44:27 GMT

hi,

I list out some command of the DTM (TX / RX). You can refer to

https://jimmywongiot.com/2019/09/02/rf-physical-test-on-the-nrf5-series/

RE: Direct Test Mode (DTM) Response

Kenneth — Tue, 05 May 2020 14:33:04 GMT

Have you made any progress? You may also find the documentation for DTM useful:
https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/ble_sdk_app_dtm_serial.html

You may need to edit the pca10040.h (if you are using nRF52832) to fit the pins you want to use:

#define RX_PIN_NUMBER 8
#define TX_PIN_NUMBER 6
#define CTS_PIN_NUMBER 7
#define RTS_PIN_NUMBER 5

Make sure to power cycle the board after programming, this should ensure that the SEGGER -jlink does not take control over the UART pins above.

The tester need to have common ground with the DK, and voltage level should be ~3V for the UART pins. Adding a 1Mohm pull-up on the RX and TX pin may be a good idea to avoid them floating while not connected to the tester.

Best regards,
Kenneth

RE: Direct Test Mode (DTM) Response

Kenneth — Mon, 04 May 2020 07:51:22 GMT

You may find the application note using DTM in production testing useful:
https://infocenter.nordicsemi.com/topic/struct_appnotes/struct/appnotes_nan34.html

Best regards,
Kenneth

RE: Direct Test Mode (DTM) Response

Sami — Thu, 30 Apr 2020 14:14:49 GMT

According to the specification I should send command "LE_Transmitter_Test" and the DUT should sent back "LE_Status".

However, I am not sure command "LE_Transmitter_Test" should be sent to the DUT and what kind of response should be expected. If I send string "LE_Transmitter_Test" to the UART port, the response is still the same.

How the commands should be sent? Is there some kind of data format?

RE: Direct Test Mode (DTM) Response

Kenneth — Thu, 30 Apr 2020 11:16:44 GMT

The commands and responses are described in BT core spec v5.2 vol 6 part F, chapter 2 (for instance page 3194):

https://www.bluetooth.com/specifications/bluetooth-core-specification/

RE: Direct Test Mode (DTM) Response

Sami — Thu, 30 Apr 2020 09:48:53 GMT

I have also tested the original example in nRF5 SDK. In other words, I did not make any changes at all. The results are the same. It does not matter which command I send, the output does not make any sense.