How to config nrf5340 tx power?

user65627 over 5 years ago

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.

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user91187 over 5 years ago in reply to user65627 +1 verified

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…

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0 user91187 over 5 years ago

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

Regard,
Joanthan
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0 user65627 over 5 years ago in reply to user91187

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.
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0 user65627 over 5 years ago in reply to user91187

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.
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+1 user91187 over 5 years ago in reply to user65627

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
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0 user91263 over 5 years ago in reply to user91187

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.
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0 user65627 over 5 years ago in reply to user91263

Hello,

Not only application project but also net project neet config.
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0 user91187 over 5 years ago in reply to user65627

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