Dynamically changing of Power level

[beemavishnu]

Hello,

 

I am using nRF52840, SDK_16.0.0, SoftDevice S140 V7.0.1 and Segger for flashing the image. I am using ‘ble_app_blinky’.

 

I want to send packet with different Tx power levels over serial interface. I am using sd_ble_gap_tx_power_set() to change Tx power.

 

1) During advertisement packet, if there is a serial command to change Tx power level, will it take immediately by calling sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_ADV).

2) Also once device is connected, it there is a serial command to change Tx power level, will it take immediately by calling sd_ble_gap_tx_power_set(BLE_GAP_TX_POWER_ROLE_CONN) or do I need to reset.

 

Thanks & Regards

Vishnu Beema

[Simonr]

Hi

I'm sorry, but I'm struggling to see what you want to do here. Do you want the nRF52 to change the TX power whenever a serial command (over UART, SPI, or TWI for example) is received? I don't think we have an example doing such a thing, but you should be able to make a command trigging the sd_ble_gap_tx_power_set() command. You can check out the UART peripheral example which makes the device print "Exit!" and do nothing if q or Q is received over UART.

Best regards,

Simon

[beemavishnu]

Hi Simon,

1) Your understanding is correct and even I implemented serial interface. My only query is based on current BLE state (Connected or Not-Connected whether can I call sd_ble_gap_tx_power_set() dynamically (Whenever command receives over serial interface).

2) Also based on BLE state do I need to call sd_ble_gap_tx_power_set() using BLE_GAP_TX_POWER_ROLE_ADV and BLE_GAP_TX_POWER_ROLE_CONN.

Thanks & Regards

Vishnu Beema

[Simonr]

Hi Vishnu

1. It should be possible to call sd_ble_gap_tx_power_set() in a connection and update it without disconnecting, but we don't have any examples doing so I'm afraid, so you'll have to implement that yourself. You can see a suggestion from my colleague here.

2. If you want to change the TX power while in a connection you should just have to use BLE_GAP_TX_POWER_ROLE_CONN as that is the parameter updating the TX power when you're in a connection.

Best regards,

Simon

[beemavishnu]

Thank you Simon for your inputs.