nRF21540 Tx Gain Configure

RE: nRF21540 Tx Gain Configure

lshlin — Mon, 20 Dec 2021 10:06:03 GMT

In 5.1: "When PDN is set to 1, the device is activated and
enters Program state. All registers will contain reset values when the device enters Program state." The PDN pin equivalently power down + reset register functions. Ididn'trealizethat regs will reset even not lost power.

RE: nRF21540 Tx Gain Configure

Kenneth — Mon, 20 Dec 2021 09:01:06 GMT

I think figures 2 to 6 and table 4 describe operation states? It's only in program state that it is possible to configure the nRF21540 and set to other states.

Kenneth

RE: nRF21540 Tx Gain Configure

lshlin — Mon, 20 Dec 2021 08:05:07 GMT

Sorry, my mistake, after configure the TX gain of confreg0, I set the PDN pin to 0 and then set to 1 again, so all the regs reset to default value.

My configure TX gain is valid now.

RE: nRF21540 Tx Gain Configure

lshlin — Fri, 17 Dec 2021 14:08:43 GMT

Thanks! Yes, I write the TX gain, MODE and TX_EN bits of NRF21540_REG_CONFREG0 at the same time in face.

In other word if set TX_EN bit to 1 and the TX_EN pin 1, the user TX gain in CONFREG0 is valid, else if clear TX_EN bit to 0 and the TX_EN pin 1, the user TX gain seem invalid?

I want to configure different TX gain and use the TX_EN, RX_EN pins to switch the TX/RX state (It's fast enough). How to configure the REG0~REG3 to let it work.

RE: nRF21540 Tx Gain Configure

Kenneth — Fri, 17 Dec 2021 10:24:24 GMT

[quote user=""]

If I set the NRF21540_REG_CONFREG0's TX_EN bit to 1 when write TX gain, the user TX gain is valid.

Can I use like this?

[/quote]

This is inline with the description in the product specification:
"The Gain word can be set in the same SPI write cycle as TX is enabled from the Program state"
Ref: https://infocenter.nordicsemi.com/pdf/nRF21540_PS_v1.0.pdf

Kenneth