Setting Tx Power nRF52832

RE: Setting Tx Power nRF52832

Kantha — Wed, 18 Apr 2018 14:13:55 GMT

for changing the tx power level you have to call the function "sd_ble_gap_tx_power_set(4)" for 4dbm,tx_power Radio transmit power in dBm (accepted values are -40, -20, -16, -12, -8, -4, 0, 3, and 4 dBm).

the code which you are referring will include the power level as a part of advertisement packet or scan response packet

RE: Setting Tx Power nRF52832

endnode — Thu, 28 Sep 2017 20:41:24 GMT

Yes indeed value 0x0A is 10 and that's invalid (= sd_ble_gap_tx_power_set function should return some error status not NRF_SUCCESS). Parameter must be int8_t meaning signed int.

RE: Setting Tx Power nRF52832

Declan — Thu, 28 Sep 2017 20:35:46 GMT

Thanks, I will try this in the morning. What should I set "m_tx_pwr = ...;" to to get the best possible range (tx power)?

In ble_gap.h there is: #define BLE_GAP_AD_TYPE_TX_POWER_LEVEL 0x0A /**< Transmit power level. (accepted values are -40, -30, -20, -16, -12, -8, -4, 0, 3, and 4 dBm)*/ Should this not be set? It is 0x0A HEX which is decimal 10 - but 10 is not an accepted value??

RE: Setting Tx Power nRF52832

endnode — Thu, 28 Sep 2017 20:29:10 GMT

Still pasting the screenshot from nRF Control Panel for Android when you are in constant distance from the beacon should show significant difference between +4dBm and -40/30 dBm. Still beacon will be visible, the typical sensitivity of good devices is <-86dBm, sometimes they can go as low as -100dBm...

RE: Setting Tx Power nRF52832

Matt — Thu, 28 Sep 2017 19:53:45 GMT

Try this:

	    // Accepted values are -40, -20, -16, -12, -8, -4, 0, 4 (dbm)
			m_tx_pwr = ...;
			err_code = sd_ble_gap_tx_power_set(m_tx_pwr);

RE: Setting Tx Power nRF52832

Declan — Thu, 28 Sep 2017 19:33:03 GMT

I do not have a BLE sniffer - I am just using the nRF Connect app on my phone.

RE: Setting Tx Power nRF52832

Matt — Thu, 28 Sep 2017 19:21:24 GMT

Can you use a BLE sniffer to capture the before/after RSSI values in your test?