nRF5340 TX Power Question

[gfgf2400a]

Hi,

In nRF5340 product specification 1.3 10/10/2020, there is "-40 dBm to +3 dBm configurable TX power". Also, I was able to use DTM firmware to verify TX power at 3dBm from RF spectrum analyzer with Nordic DTM network core firmware.

With nRF5340 audio DK PCA10121 and SDK nRF Connect v2.4.0, there is enum ble_hci_vs_tx_power. However, it only has 0dBm to -40dBm.

Question 1) Why 3dBm is not included? Is that because PacketCraft network core does not support 3dBm?

I changed set connTxPwr to 3 and called ble_hci_vsc_conn_tx_pwr_set(connHandle, connTxPwr). The RF spectrum analyzer still shows 0dBm.

Question 2) is root cause same as question 1 that PacketCraft network core does not support TX power 3dBm?

I don't have the FE nRF21540 or equivalent, therefore my thinking is ble_hci_vsc_radio_high_pwr_mode_set(BLE_HCI_VSC_MAX_TX_PWR_3dBm) should not be applicable.

Question 3) I am going to check this next but would ble_hci_vsc_radio_high_pwr_mode_set(BLE_HCI_VSC_MAX_TX_PWR_3dBm) help?

Thanks,

Dennis

[gfgf2400a]

Even that I don't have FE nRF21540 or equivalent, ble_hci_vsc_radio_high_pwr_mode_set(BLE_HCI_VSC_MAX_TX_PWR_3dBm) gave me TX powered of 3dBm. The main issue here is the API function calls are confusing. I would have ble_hci_vsc_conn_tx_pwr_set() to cover the whole range of -40 dBm to +3 dBm. I am good now. thanks

[frankbuss]

Did you set any other CONFIG variable to call this function? And where did you call it? It was not available for me, so I included the internal header manually and copied the function, then called it from ble_ready, but got the error -5 (so probably -EIO).

[frankbuss]

Nevermind, the set_tx_power function from this project here worked for 3 dBm: devzone.nordicsemi.com/.../how-to-set-tx-power-to-maximum-8dbm-for-advertising-as-well-as-when-connected