Error with peripheral_uart_coded.

[KarthikKumar]

Hi,

Referring to the case,

https://devzone.nordicsemi.com/f/nordic-q-a/72660/nrf-connect-sdk-v-1-5-0-how-where-to-change-phy-and-tx-power-for-long-range-application

I used the peripheral_uart_coded.rar code, but when tried to flash it on the nRF5340-DK board there is an error been prompted as     invalid use of undefined type 'struct bt_conn'.  what might be the issue.

I'm using SDK v1.8.0 and Visual studio code.

Regards

Karthik Kumar

[KarthikKumar]

Hi,

Irrespective of I change values its always 0. But I wNted to set it the the maximum TX_power of nRF5340 which is 3dB.

 int8_t tx_power = 0x03;

set_tx_power(BT_HCI_VS_LL_HANDLE_TYPE_ADV,0,tx_power);

Regards,

Karthik Kumar

[Alexander Thorstensen]

I am using an idential implementation of set_tx_power, and I get the same result. Whenever I request +3 dB I get the Actual tx Power: 0 response.

I spent some time digging and I suspect the request to set +3dB is reduced to a 0 dB request by a call to hal_radio_tx_power_floor() from deep down in the guts of the bluetooth driver / subsystem

[Marte Myrvold]

Hi,

I can confirm that I am also able to reproduce the issue, but I am still working on finding a solution. It only seems to be an issue on nRF5340 DK, as when trying the same application on a nRF52840 DK the TX power was changed from 0 to 3. Additionally, I tested the HCI Power Control sample in Zephyr, which the set_tx_power() function is originally from, and the TX power is changed successfully on nRF5340 DK using that sample.

Best regards,

Marte

[KarthikKumar]

Hi Alexander,

So how can that be corrected?

[Alexander Thorstensen]

We got the desired result by writing the radio high voltage bit from cpunet before we enable bluetooth, similar to what is beeing done here:

https://devzone.nordicsemi.com/f/nordic-q-a/58819/nrf5340-vreqctrl-for-additional-3-db-tx-power

I am not sure if this is how + 3dB was intended to be activated, but it did the trick for us.