Change advertising TX power on NRF53

RE: Change advertising TX power on NRF53

Hung Bui — Wed, 20 Jul 2022 13:55:59 GMT

Hi Cong, please open a new case for your request. Please give more information on the "module that measures the bluetooth rate".
Not sure if this help, but you can try this example: How to set TX power to maximum +8dbm for advertising as well as when connected

RE: Change advertising TX power on NRF53

Cong Ma — Wed, 20 Jul 2022 13:04:20 GMT

Hi,

I need to do the same thing now, I want to add the set_tx_power() function to the module that measures the bluetooth rate. What is the library and config that I need to add to it? I have stuck here for days T.T

Many thanks

Cong

RE: Change advertising TX power on NRF53

Samuel Escobar — Mon, 11 Jul 2022 20:11:50 GMT

Dear Hung,

Thanks for your help eventually I managed to get it to work with the information you provided.

One additional thing I had to figure out was that the set_tx_power() function must be called after the advertising payload was set. Just in case someone runs into the same issue.

RE: Change advertising TX power on NRF53

Hung Bui — Tue, 05 Jul 2022 12:49:06 GMT

Hi Samuel,

You would need to make sure you have added this CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y

Into the network core application which is the hci_rpmsg.
To do that (if you don't want to modify the hci_rmpsg directly) you need to create an overlay file named hci_rpmsg.conf inside child_image folder in your project.
And you add CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y in that file, the same as in the hci_pwr_ctrl example.

Also make sure you only set the tx power to what available in the datasheet of the nRF5340:

0dBm 0x0 0 dBm
Neg1dBm 0xFF -1 dBm
Neg2dBm 0xFE -2 dBm
Neg3dBm 0xFD -3 dBm
Neg4dBm 0xFC -4 dBm
Neg5dBm 0xFB -5 dBm
Neg6dBm 0xFA -6 dBm
Neg7dBm 0xF9 -7 dBm
Neg8dBm 0xF8 -8 dBm
Neg12dBm 0xF4 -12 dBm
Neg16dBm 0xF0 -16 dBm
Neg20dBm 0xEC -20 dBm

Neg40dBm 0xD8 -40 dBm

RE: Change advertising TX power on NRF53

Samuel Escobar — Mon, 04 Jul 2022 20:31:23 GMT

Der Hung, thanks for your reply. I've seen the example that you mentioned and I've taken the set_tx_power() function and implemented it on my code. I added the required libraries and copied the CONFIGS found on the "hci_power_ctrl" example.

Now I am getting one error message and one warning once this function runs.

The error is thrown from this part of the set_tx_power() function:

and the warning I really dont know what to make of it.

Would you happen to know what might be happening?

Thanks in advance.

Samuel

RE: Change advertising TX power on NRF53

Hung Bui — Mon, 04 Jul 2022 13:20:56 GMT

Hi Samuel,

You can have a look at this example: https://docs.zephyrproject.org/latest/samples/bluetooth/hci_pwr_ctrl/README.html

You can find the code to change TXPower in set_tx_power() function.