Wi-Fi and BLE coexistence

RE: Wi-Fi and BLE coexistence

Simonr — Mon, 31 Mar 2025 11:56:11 GMT

That's correct Magnus!

Let me know if you have any further follow-ups.

RE: Wi-Fi and BLE coexistence

MagnusPersson — Mon, 31 Mar 2025 07:27:10 GMT

Hi,

Ok, thanks.

So the default mode today (nRF Connect SDK 2.9.1) is that the coex interface is running in is 3-wire mode with separate antennas, and this is currently the only supported mode?

Thanks,

Magnus

RE: Wi-Fi and BLE coexistence

Simonr — Fri, 28 Mar 2025 11:25:10 GMT

COEX_STATUS1/ SW_CTRL1 is an Input/Output pin. In 4-wire mode, this carries the Bluetooth LE/ IEEE 802.15.4 1 bit priority signal. In 3-wire Shared Antenna mode, this can be optionally used as a second antenna switch control signal. So it depends what mode you're running it in whether this will be used as an input or output, but the pin itself is indeed bidirectional. We asked the developers internally how to do so, and it seems there is no API/software support for switching between 3 and 4 wire coexistence yet, and this will be coming in future SDK releases. Please contact the Nordic sales manager of your area for a roadmap/timeline of when this can be expected.

Best regards,

Simon

RE: Wi-Fi and BLE coexistence

MagnusPersson — Thu, 27 Mar 2025 14:43:03 GMT

Hi,

OK, so in the example of the nRF7002DK the pin COEX_STATUS1/SW_CTRL1 is named swctrl1 in the nRF5340 device tree and user guide of nRF7002DK. Will this pin in this case be used as an output from the nRF7002 to the nRF5340?

The DTS binding seems to hint that is actually the STATUS1 (priority signal) function? And an output from nRF5340?

Also, in the schematics of the nRF7002DK this is named both STATUS1 and SW_CTRL1 and seems to be bidirectional (usage decided by SW)? How would you set up the SW (device tree?) for the 2 different uses of this pin?

Sorry about my confusion.

Thanks,

Magnus

RE: Wi-Fi and BLE coexistence

Simonr — Wed, 26 Mar 2025 10:27:59 GMT

1. If we use the nRF7002 DK as reference, we can see that the Wi-Fi antenna switch (swcrtl) is connected directly to the antenna switch. It does not need to go via the host.

2. The behavior of SW_CTRL0/1 is programmable and dependent on the configured coexistence mode and switch control interface, so if they're not used, you can leave them floating.

3.This depends on whether you're using it in 3 or 4 wire mode. From the pin description: "In 4-wire mode, this carries the Bluetooth LE/ IEEE 802.15.4 1 bit priority signal. In 3-wire Shared Antenna mode, this can be optionally used as a second antenna switch control signal." So it should work depending on how you've set it up in the devicetree.

Best regards,

Simon