How to set the RF output power

[gocchan]

I'm investigating how to change the TX output power for hardware testing.

I was able to confirm that the power changes by writing BLE_TransparentMode to the STM32WBA25 and sending the following HCI command via UART.

0x01 0x0F 0xFC 0x02 <EnHighPower> <PowerLevel>

However, while Table 468 of AN5270 suggests that it can be set up to +6dBm, there appears to be no change in the actual output between setting it to 0dBm and setting it to +6dBm.

0x01 0x0F 0xFC 0x02 0x01 0x19

0x01 0x0F 0xFC 0x02 0x01 0x1F

Setting it to a value lower than 0dBm seems to change the output as expected.

Is it actually not possible to set it to a value higher than 0dBm?

[Imen.D]

Hello ​@gocchan ,

I recommend you the following article that will help you on the RF output power configuration within STM32WBA:

STM32WBA Bluetooth® LE RF Output Power Configuration - stm32mcu

[gocchan]

Thank you for the information.
I was able to confirm that the output power changes when using the ACI_HAL_SET_TX_POWER_LEVEL command.
Setting PA_Level to 0x1D returns "Unsupported," so I think this board is currently using the low power table. Is there a way to change it to the max power table?

[Issamos]

Hello ​@gocchan 

To activate the max power table, you must toggle the En_High_Power parameter from 0 to 1 when calling the function ACI_HAL_SET_TX_POWER_LEVEL. This shifts the board's radio output from the standard low-power map to the high-power map:

Best Regards.

II