Support request for forcing the NFC peripheral st25r3911b in low power mode (or power down)

[Jamal_nRF]

Dear Customer Support,

We use the  nRF52840 as our main controller

For our NFC / tag detect requirement, we use the ST25R3911B over a SPI interface

It's datasheet is available here

https://www.alldatasheet.com/datasheet-pdf/pdf/927251/STMICROELECTRONICS/ST25R3911B.html

We have integrated the NRF drivers available here

https://github.com/nrfconnect/sdk-nrf/tree/main/lib/st25r3911b

Overall the scan detection is working fine using couple different tag types

So far so good.

Next step, we are trying to force the NFC peripheral into some sort of sleep mode, or low power mode, or even power down

Question:

Does the available NRF drivers offer such interface?

Thank you

[Einar Thorsrud]

Hi,

The SDK has some support for ST25R3911B (doc), but not power management. I see from the ST25R3911B documentation that there is some low power features in the ST25R3911B, but I recomend you refer to ST for details on that.

[Jamal_nRF]

Hello Einar Thorsrud,

Follow up question:

could Nordic share the author(s) of the zephyr drivers st25r3911b available here

https://github.com/nrfconnect/sdk-nrf/tree/main/lib/st25r3911b

Thank you,

Jamal

[Einar Thorsrud]

Hi Jamal,

The driver in Zephyr was written by Nordic employees a long time a go, as it has been used as a comanion for testign the nRF5 devices NFC tag feature (see nfc_reader).

Einar

[Jamal_nRF]

Hello Einar,

We have integrated the st25r3911b peripheral for a customer

and used the Nordic drivers from the Zephyr baseline

In the process we have identified a bug and the associated fix for it

Could you please advise on the process to promote our fix back into the Zephyr baseline?

What would be the starting point?

Thank you

[Einar Thorsrud]

Hi Jamal,

I see, that is very welcome. You can create a pull request with https://github.com/zephyrproject-rtos/zephyr. The details are described under Pull Requests and Issues in the Zephyr documentation. If you can link to it here as well for reference that will be much appreciated.

Br,

Einar