Configuring and setting the TX power in BLE ADVertisement and connection.

[Himanshu-4]

Hello everyone. 

i want to configure the TX power of the NRF radio in BLE advertisement and connection of the NRF54L15 MCU. I am using the nrf Connect SDK version  2.7.0. the Online Documentation show me to use  CONFIG_BT_CTLR_TX_PWR_MINUS_<X> or CONFIG_BT_CTLR_TX_PWR_PLUS_<X> in the prj.conf file. But after setting the TX Power to +8db here (CONFIG_BT_CTLR_TX_PWR_PLUS_8=y). i don't get the correct power output as when i read the NRF_RADIO->TXPWR register in case of advertisement and connection. i get the value of -2dbm. i am not understanding why it this so. also i did'nt see any API provided by Zephyr's to control the TX and RX power of Radio. please help me in this.

[Kazi Afroza Sultana]

Hello,

Which specific samples form NCS you are working on, or it is your custom project?

Thanks.

BR

Kazi

[Himanshu-4]

Hello, 
Actually i am working on a ncs sample. 
This sample can be found under samples/bluetooth/peripheral_gatt_write in the Zephyr tree.
here is my project config file   prj.conf

CONFIG_BT=y

CONFIG_BT_PERIPHERAL=y

CONFIG_BT_SMP=y

CONFIG_BT_GATT_CLIENT=y

CONFIG_BT_DEVICE_NAME="Zephyr GATT Write"

CONFIG_BT_BUF_ACL_RX_SIZE=255

CONFIG_BT_BUF_ACL_TX_SIZE=251

CONFIG_BT_BUF_CMD_TX_SIZE=255

CONFIG_BT_BUF_EVT_DISCARDABLE_SIZE=255

CONFIG_BT_L2CAP_TX_MTU=247

CONFIG_LOG=y

# Enable logging backend (e.g., UART for console output)

CONFIG_LOG_BACKEND_UART=y

CONFIG_UART_CONSOLE=y       # Enable UART console for printk and logs

CONFIG_PRINTK=y

CONFIG_STDOUT_CONSOLE=y

# CONFIG_BT_PHY_UPDATE=y

# CONFIG_BT_USER_PHY_UPDATE=y

# CONFIG_BT_CTLR_DATA_LENGTH_MAX=251

# CONFIG_BT_CTLR_ADV_EXT=y

CONFIG_BT_CTLR_TX_PWR_PLUS_8=y

# CONFIG_BT_CTLR_TX_PWR_0=y

# CONFIG_BT_CTLR_TX_PWR_PLUS_8=y

# CONFIG_BT_CTLR_TX_PWR_ANTENNA=y%

[Kazi Afroza Sultana]

Hello,

Can you add CONFIG_BT_CTLR_TX_PWR_DYNAMIC_CONTROL=y int he prj.conf file?

One thing I am wondering how have you measured/checked power; is it by using command or using Spectrum analyzer or both?

Sorry for late reply. It's holiday time in Norway; so, this unwanted delay. 

BR
Kazi

[Kazi Afroza Sultana]

Hello,

I have not received any reply for more than 5 months. I am going to close this case. If you still need help, can reopen this one or create a new ticket mentioning the old one.

Thanks.

BR
Kazi