RE: Difference between DTM and Radio test example.

beemavishnu — Mon, 11 May 2020 18:21:32 GMT

Thank you for your inputs.

RE: Difference between DTM and Radio test example.

bjorn-spockeli — Mon, 11 May 2020 11:50:02 GMT

[quote user=""]1) I am seeing receive and transmit example. Is this used for any certification. What is the purpose of this examples. Other than just transmit and receive I am not finding any use case. Even I can any ble_app_blinky example to Tx and Rx data (Of course UUID based transmission / reception).[/quote]

The Radio Test example is a simple example that allows you to control the RADIO, e.g. transmit a constant carrier or enter RX mode. Most customers use this for FCC/CE sertification.

[quote user=""][/quote]

2) I am seeing “Radio Test Example”. What is the difference between Radio Test example and DTM. In nRF Connect Desktop tool under DTM, I am able to see all setting similar to “Radio Test Example”.

Even I have gone through “RF Performance Test Guidelines White Paper” from below link.

https://infocenter.nordicsemi.com/pdf/nwp_006.pdf?cp=12_21

a) Whether “Radio Test Example” is used for FCC, ETSI certification.

b) How about DTM, whether it is used only for Bluetooth SIG specific specification or even used for FCC, ETSI etc.

The Radio Test Example demonstrates how to configure the radio as the constant RX or TX carrier, the modulated TX carrier, or the RX or TX sweep.

While the DTM example is more advanced and its purpose is to test the operation of the radio at the physical level, such as:

Transmission power and receiver sensitivity
Frequency offset and drift
Modulation characteristics
Packet error rate
Intermodulation performance

See Radio Test Example and Direct Test Mode example documentation

So yes, the radio_test example is used for FCC and CE certification. The DTM example is primarly used for Bluetooth qualification , but can also be used for FCC/CE certification.

[quote user=""]3) To my understanding, DTM will be tested based on RF-PHY in below link. Correct me if I am wrong.[/quote]

See the Direct Test Mode example documentation

[quote user=""]4) Similar to “nRF Performance Test Instructions for nRF24L01+”, is there any application note for nRF52832 & nRF52840.[/quote]

[quote user=""]5) Whether can I do DFU package for “Radio Test Example”. Because in factory once they flash any code, then need to flash actual BLE application via Serial DFU.[/quote]

The radio_test example can be placed in DFU package, but you need to recompile it to start at the correct offset depending on the SoftDevice used. The default example starts at 0x0000.