How to perform DTM test for 52840.

[Mark_Y]

Hi all,

I want to evaluate the performance of BLE. And I use the dtm test example, when I use the cw500 connecting the nRF52840 DK, It always indicates that the EUT connection failed. How should I connect and test. Thanks!

[JONATHAN LL]

Hi,

Are you using the nRF5 SDK or the NCS SDK?

You could also reach out to R&S as we have little expertise on the CMW500, its likely that there is something with how the CMW500 communications with the nRF52840DK.

Some relevant links: 
https://infocenter.nordicsemi.com/topic/struct_appnotes/struct/appnotes_nan34.html?cp=17_4 

https://devzone.nordicsemi.com/f/nordic-q-a/70772/emc-certification-52840-dtm-working-with-the-r-s-cmw-500 

https://devzone.nordicsemi.com/f/nordic-q-a/57446/how-to-test-nrf52840-with-cmw500 

There is also a few more relevant cases that can be found here: https://devzone.nordicsemi.com/search?q=CMW500%20DTM 

Regards,
Jonathan

[Mark_Y]

And I use the Anritsu tester that can't connect nRF52480DK properly.And I test wit Anritsu's MT8852B, it shows eut error.

How can I solve it. Thanks!

[JONATHAN LL]

We only support UART interface in our DTM application. HCI is not supported. 

There is a section for the Anritsu tester in the app note ; https://infocenter.nordicsemi.com/topic/struct_appnotes/struct/appnotes_nan34.html?cp=17_4 



Use a couple of the GPIO pins for uart and connect to an FTDI cable to connect the DUT to the Tester. 


Regards,
Jonathan

[Mark_Y]

Which GPIO should I use? Now I try to use GPIO VCC, GND, TX, RX to enter the DTM, but it does not work. According to the datasheet, we must use DTM_ENABLE to enter DTM, so I want to ask that which GPIO can be used for DTM_ENABLE.

[JONATHAN LL]

You could use any GPIO that is available to you. The DTM_ENABLE pin is optional so you don't need to use it, but it can be nice to have in a production line. It does not seem like the DTM_ENABLE pin is critical for you setup.

How have you connected the nRF52840DK? 

We have a DTM app in the nRF Connect for Desktop that can be used with DK's. Se this section https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/direct_test_mode/README.html#testing-with-nrf-connect-for-desktop 

Regards,
Jonathan