nRF52840 DK DTM with HEX file

[Ken Li]

Hi,

We want to have some RF-PHY tests on nRF52840 DK.

Therefore, I need a HEX file to make nRF52840 DK get into direct test mode and communicate with CMW270 with UART.

Also, I want to know which pins on nRF52840 DK and baudrate should I use ?

Thanks for your help !

BR,

Ken

[Priyanka]

Hi,

You can use the DTM sample for the RF-PHY tests.

Please also refer this ticket which may be of help.

Regards,

Priyanka

[Ken Li]

Hi Priyanka,

Thanks for replying, I'm now using nRF Connect SDK v2.3.0.

Should I update SDK to the latest version?

BR,

Ken

[Priyanka]

Hi,

You can use the CONFIG_BT_CTLR_TX_PWR to set the Tx power.

-Priyanka

[Ken Li]

Hi Priyanka,

I find the Kconfig file under this path : v2.6.1\zephyr\subsys\bluetooth\controller.

I've tried to replace BT_CTLR_TX_PWR_0 with BT_CTLR_TX_PWR_PLUS_8, but it didn't work.

Which line should I modify if I want to set Tx power to 8dBm?

BR,

Ken

[Priyanka]

Hi,

To set the Tx power to 8dBm, you should modify your prj.conf file, not the Kconfig file in the Zephyr subsystem.
In your prj.conf file, you should add the line CONFIG_BT_CTLR_TX_PWR_PLUS_8=y. This will set the Tx power to +8dBm. Also, please make sure to add  CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y 

-Priyanka

[Priyanka]

You can also refer to some of the tickets that I have attached:

 How to set the Tx power to +8db on nRF52840 

 NCS 2.5.2, legacy adv, how to increase legacy adv tx power 

  

[Ken Li]

Hi Priyanka,

Priyanka said:

add the line CONFIG_BT_CTLR_TX_PWR_PLUS_8=y. This will set the Tx power to +8dBm. Also, please make sure to add  CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y

I add these two line to prj.conf under this path : v2.6.1\nrf\samples\bluetooth\direct_test_mode, but tx power is still -1dBm.

Priyanka said:

How to set the Tx power to +8db on nRF52840

I also check .config under this path : v2.6.1\nrf\samples\bluetooth\direct_test_mode\build\zephyr, but I can't find CONFIG_BT_CTLR_TX_PWR_PLUS_8=y and CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y in that file.

Does it mean that I can't change Tx power under direct test mode?

BR,

Ken

[Ken Li]

By the way, I compile DTM example in this way : 

Using nRF Connect SDK and west to compile and program the DTM example into the nRF52840 DK

[Priyanka]

Hi,

Taking a deeper look, it looks like using the CONFIG_BT_CTLR_TX_PWR_PLUS_8=y is for all other applications, but for the DTM sample it's a bit different.

You can see here: https://github.com/nrfconnect/sdk-nrf/blob/v2.6.1/samples/bluetooth/direct_test_mode/src/dtm.c#L401C3-L401C10 

that the default is set to 0dBm from NRF_RADIO_TXPOWER_0DBM. S you could try setting this to say, NRF_RADIO_TXPOWER_POS8DBM

Sorry for the confusion and do let me know how it goes.

-Priyanka

[Ken Li]

Hi Priyanka,

Priyanka said:

NRF_RADIO_TXPOWER_POS8DBM

I try this setting, and it works.

Thank you for your support !

BR,

Ken