How do I put the NRF51422 into +4dBm mode?

[Rick Gibbs]

I have attempted to put the radio into +4dBm mode using the command: sd_ant_channel_radio_tx_power_set(CHANNEL_0, RADIO_TX_POWER_LVL_3);

When I look at the RADIO TXPOWER register is is set to 0. This indicated it is in 0dBm mode.

If I try using RADIO_TX_POWER_LVL_0 the lowest power, then the TXPOWER indicates 0xEC which is the -20dBm. So, it looks like it is changing with this command.

The only valid levels in the header file are 0, 1, 2, 3. Therefore, I do not see a method to get the radio into +4dBm mode. Can someone shed some light on this?

[Steven Wik]

Hi,

You can change the TX power using the command below to directly modify the register when using a proprietary radio protocol. I am not sure if ANT supports +4dBm in the Nordic library.

NRF_RADIO->TXPOWER = (RADIO_TXPOWER_TXPOWER_Pos4dBm << RADIO_TXPOWER_TXPOWER_Pos)

Cheers, Steve

[Ole Morten]

This is actually a missing define in the header file, that will be corrected in future versions. For now, you can add this as follows

#define RADIO_TX_POWER_LVL_4    4 // = +4dBm

and then use it like the others.

The value is explained in section 9.4.3 in the ANT Message Protocol and Usage document.