How to config nrf5340 tx power?

[Август]

 Hello,

I want to modify the default transmit power of the nrf5340 peripheral_uart project.

board:nrf5340 dk

ncs:v1.5.0

example:v1.5.0\nrf\samples\bluetooth\peripheral_uart

I found this project v1.5.0\zephyr\samples\bluetooth\hci_pwr_ctrl

Then I transplanted the set_tx_power function to my project.

But the power remains unchanged.

Can you help me point out the correct way，I just want to modify the power.

Thank you.

[JONATHAN LL]

Did you sett the prj.conf files also 
CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y

Regard,
Joanthan

[Август]

Hi Joanthan,

Thank you for your reply.

Yes I did, but unfortunately it doesn't work.

Now I have solved this problem by set the prj.conf files.

CONFIG_BT_LL_SOFTDEVICE=n

CONFIG_BT_LL_SW_SPLIT=y

CONFIG_BT_CTLR_ADVANCED_FEATURES=y

CONFIG_BT_CTLR_CONN_RSSI=y

CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y

But I don’t know why this is done, is there some documentations can help me?

Thank you.

 

[JONATHAN LL]

The SoftDevice does not have full support for set_tx, but read_tx is supported. So then LL_SPLIT is then needed to get the desired operation. 
You can check out more of the documentation on the different configs here: BT_CTLR_CONN_RSSI — Kconfig reference (nordicsemi.com) 
Regards,
Jonathan

[variant]

With NCS v1.5.0, the Read Tx Power is failing (as well as the Write Tx Power) when using the nRF5340.

Here's the error message that I get for the read case (which the comment above says is supported):

Read tx power failed (err -5, reason 0x00).
[02:30:52.295,684] <wrn> bt_hci_core: opcode 0xfc0f pool id 8 pool 0x20000d70 != &hci_cmd_pool 0x20000d44
[02:30:52.295,715] <wrn> bt_hci_core: opcode 0xfc0f status 0x01

Update:  My bad.  The Read Tx Power does indeed work when using the SoftDevice.  My mistake above was that I needed to add

CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y

to the hci_rpmsg.conf file for the network core.

The Set Tx Power works only for 0 dBm.

[Август]

Hello,

Not only application project but also net project neet config.

[JONATHAN LL]

Did you get it to work when you added to the network-config ?
Regards,
Jonathan