problem with CTE packets on nrf5340

[Mohammad Ranjbar]

I want to use nrf5340  on DTM mode (installed through nrf connect) to test Carrier frequency offset for CTE packets using CMW500. However, CMW uses power trigger to find the packets and based on my investigation, in nrf5340 CTE packets, TX power is always enabled even in between packets (We always have power). So CMW can not find packets. I'd appreciate any help.

[Simonr]

Hi again

The nRF5340 DK has only been tested with the Programmer app. The DTM app should support any device following the BLE DTM specification (the version from the nRF5 SDK). So you'll need to modify and program this DTM firmware onto the nRF5340 in order to run it on the nRF Connect application.

One of our developers tested the DTM example for the nRF5340 using an RF tester and found that the CTE worked as intended. The duration of the CTE is also required. The issue could you're seeing could be specific to NCS v1.4.0 (if that's the version you're using), where an incorrect SHORT was set up in the Radio. This was fixed with the following commit (see GitHub link here). It is recommended to rebase on top of the sdk-nrf master or use the Development tag (v1.4.99-dev1).

Best regards,

Simon