• State Not Answered
  • Replies 5 replies
  • Subscribers 63 subscribers
  • Views 169 views
  • Users 0 members are here
Attachments (0)
Nordic Case Info
  • Case ID: 325913
Options

Can't set TX power NRF5340 audio dk

Hejdern

Hello!

I'm trying to change the output TX power in the nrf5340 audio dk. I'm setting:

CONFIG_BLE_CONN_TX_POWER_NEG_40DBM=y

CONFIG_BLE_ADV_TX_POWER_NEG_40DBM=y

I do this to compare with the default 0 dBm setting. I'm running version 2.6.0 and using the BIS broadcast mode. The above doesn't show any change when measuring RSSI at a given distance.

Is there another setting I need to do in order to control the output power?

Thanks and regards,

Henrik 

Parents
  • 0

    Hi Henrik

    As of v2.6.0 of the SDK the LE Audio application no longer uses a special Bluetooth controller for audio only, but now uses the regular SoftDevice controller. As such the method for setting the TX power is the same as any other Bluetooth application, as described here.

    The old configurations should have been removed, and we will make sure to remove them in a future update to avoid this confusion. 

    Best regards
    Torbjørn

  • 0 in reply to ovrebekk

    Thanks! That worked out well! I edited the child_image/hci_ipc.conf file and then it worked.

    I'm about to try out the nrf21540 FEM and I read in the docs:

    "When you build the nRF5340 Audio application with the nRF21540 FEM support, the LE Audio controller for nRF5340 does not support the +20 dBm setting. This is because of a power class restriction in the controller’s QDID."

    Is it certification-wise ok to use +20 dBm for a LE Audio Broadcast, or where does this limitation come from? Is it a nrf5340 issue or something else? (We are looking into a Broadcast project and need to understand the limitations)

    /Henrik

Reply
  • 0 in reply to ovrebekk

    Thanks! That worked out well! I edited the child_image/hci_ipc.conf file and then it worked.

    I'm about to try out the nrf21540 FEM and I read in the docs:

    "When you build the nRF5340 Audio application with the nRF21540 FEM support, the LE Audio controller for nRF5340 does not support the +20 dBm setting. This is because of a power class restriction in the controller’s QDID."

    Is it certification-wise ok to use +20 dBm for a LE Audio Broadcast, or where does this limitation come from? Is it a nrf5340 issue or something else? (We are looking into a Broadcast project and need to understand the limitations)

    /Henrik

Children
Related