Recommended minimal connections between nRF9160, nRF52832 and satellite modem

RE: Recommended minimal connections between nRF9160, nRF52832 and satellite modem

Kenneth — Mon, 12 Apr 2021 14:57:42 GMT

I didn't think of that, I notice the nRF52833 have 2 UARTs, maybe that can be considered:
https://infocenter.nordicsemi.com/topic/struct_nrf52/struct/nrf52.html

I am not sure if zephyr have any software UART implementations that may be used no.

Kenneth

RE: Recommended minimal connections between nRF9160, nRF52832 and satellite modem

okwestern — Fri, 09 Apr 2021 09:29:11 GMT

I just discovered the nRF52832 needs its single UART for other things, so the question is, what is the best alternative? As an emergency solution, I was thinking an UART to SPI bridge chip, but if I can do it all in software that would be best (and something that is easy to implement/ready libs in Zephyr).

RE: Recommended minimal connections between nRF9160, nRF52832 and satellite modem

Kenneth — Tue, 09 Mar 2021 10:10:33 GMT

I suggest to add an additional pin that can be used to trigger DFU mode.

Kenneth

RE: Recommended minimal connections between nRF9160, nRF52832 and satellite modem

okwestern — Sun, 07 Mar 2021 08:42:52 GMT

Would UART also be enough for FOTA from nRF9160 to nRF52832? Or do I need some direct reset signal, etc? I would think the nRF91 could send a firmware update message to the nRF52, then upload the firmware in nRF52 flash, and the nRF52 resets himself into update mode...?

RE: Recommended minimal connections between nRF9160, nRF52832 and satellite modem

Kenneth — Mon, 01 Mar 2021 14:00:36 GMT

UART is a common serial interface, so I would say yes.

Kenneth

RE: Recommended minimal connections between nRF9160, nRF52832 and satellite modem

okwestern — Mon, 01 Mar 2021 12:55:24 GMT

Thanks! Would UART be the best way to communicate between the nRF91/nRF52, given it uses only 2 or 4 signals?

RE: Recommended minimal connections between nRF9160, nRF52832 and satellite modem

Kenneth — Mon, 01 Mar 2021 12:49:47 GMT

[quote user=""]I have a few pins to spare on both nRF, but don't want to waste them in case I need them in a later revision. Would there be any benefits with more connections between the two nRF besides tx/rx? [/quote]

If you add HWFC (2pins: CTS and RTS) then you get better control of power consumption, since you can disable the UART interface when there is no data.

[quote user=""]I've connected COEX0 to control the power on of a GNSS LNA. Anything else that would be wise (either to nRF52 or the satellite modem)?[/quote]

Not that I can think of.