CC1352P: How to Set BLE Tx Power

Hi Amit,

Someone will take a look at your thread and help you soon.

Thank you for your patience.

BR,
Andres

This is tied to what you select as "Based on RF Design". The Launchpad you have selected has the 20 dBm path on 915 MHz and therefore you will not be able to select higher than 5 dBm on 2.4 GHz.

If you select a different Launchpad, then you should be able to select 20 Bm:

I have modified it to LAUNCHXL-CC1352P-2 Rf design, but the "Default Tx power" is still limited to 5 dBm max ( Although PA checkbox is checked):

How have you setup the project to start with?

Have you selected "Use Custom Board" (not required if your design uses the same pins as the Launchpad)

The reason I ask is that it's not possible to just change the "Based on RF Design" without getting errors in syscfg. 

Are you able to import an example for the CC1352P-2 Launchpad and start from there? 

Yes, I have selected " use custom board". Still, The default Tx power is limited by 5dBm.

To test this I imported "simple_peripheral_CC13X2P1 (From the 5.20 SDK)

Then I selected "Use Custom Board". 

Changing "Based On RF Design" under "BLE" and "RF Design" to LAUNCHXL-CC1352P-2 made it possible to select 20 dBm.

Your "Default tx power" is set to 0dBm , not 20dBm.

I'm able to set this to 20 dBm:

The max default will follow the max for "TX Power (dBm)"

Do you mean that you have designed you board to support 20 dBm both for 868 MHz and 2.4 GHz? If so, how have you done the matching to support both bands? 

I need to better understand your implementation before I'm able to answer the rest of the question.  

Hi,

We use a wide range balun for PA path support of 868/2.4Ghz.

Our deviec uses propritry 868Mhz and BLE for mobile phone configuration. 

User can set output power for 868Mhz and BLE separately.

We would like to assign PA to the frequency band during program initialization ( According to user configuration).

Since none of our reference designs uses this configuration, syscfg has not been designed to handle this case. Syscfg only allow 20 dBm on either 868/ 915 MHz or 2.4 GHz. 

To support what you want to I believe the easiest would be to disable syscfg after you have done the setup you are able to do with this tool and then change ti_radio_config.c. For your use this has to be containing both overrides and 20 dBm PA tables for 868 MHz and 2.4 GHz (copy/ paste from a couple of projects that use the PA on these frequency bands). Then ensure that the wanted override/ PA table is used. 

From my understanding, BLE is limited to 10 dBm. Have you looked into this?  

Hi,

Thanks for the quick reply.

EasyLink_setRfPower() will set Tx power also to BLE ( 2.4Ghz) or is there a separate API to set BLE Tx output power?

I'm aware of BT tx power limitation ( 10dBm) for regulatory compliance, However, we still want to use max output power ( 20dBM) on the BLE path for specific applications/customers.

Hi Marie,

Calling HCI_EXT_SetTxPowerCmd() makes no difference ton BLE Tx power.

BLE Tx power is set by ICALL init parameters  , and invoking HCI_EXT_SetTxPowerCmd() afterward has no effect on Tx output power.

btw, Using Simple link SDK_5.30.01.01

Hi Amit,

Which packets in particular are you looking at? Advertisement packets or connection packets?

Cheers,

Marie H.

Hi Marie,

Not sure it makes any difference:

BLE Tx power is not the same for Advertisement and connection packets?

As mentioned, If I modify ICALL initial parameters , for example:

user0Cfg.boardConfig->txPwrTbldefaultTxPwrVal = LL_EXT_TX_POWER_P2_19_DBM;

I can see BLE Tx power is increased ( Both by checking power consumption and by rssi on a mobile phone).

invoking HCI_EXT_SetTxPowerCmd() during run time makes no difference on both Advertisement packets or connection packets.

Hi Amit,

Yes in the BLE Stack, ADV and connection packets have different ways of setting the Tx power.

Cheers,

Marie H

Hi Marie,

We need settings Tx power for both ADv and connection.

traced HCI_EXT_SetTxPowerCmd() disassembly and it actually doing nothing.

Hi Amit,

For ADV packets, you can select a Tx power for each advertisement set in SysConfig: RF STACKS-> BLE-> Broadcaster Configuration -> Advertisement Set X-> Advertisement Parameters X -> Tx power -> Set to Tx Power value. You will then get an additional setting, TX Power value, where you can select the Tx power.

Cheers,

Marie H

Hi Amit,

I just realized you're using CC1352P1 and not CC1352P-2- The P-2 board is optimised for high PA on the 2.4 GHz band.

Cheers,

Marie H

Hi Amit,

Can you try importing a CC1352p-2 LP example and do the same configuration? I think you might have run into a sysconfig limitation.

Cheers,

Marie H.

Hi Marie,

We need to set ADv Tx power dynamically according to desired power level saved the flash memory,

Tried using    GapAdv_setParam(advHandleLegacy, GAP_ADV_PARAM_TX_POWER, &ble_tx_power), but it also makes no difference.

Hi Amit,

Advertising needs to be disabled before changing the Tx power.

Cheers,

Marie H