Shell over UART between nrf52840DK and nrf9160DK not working(SDK v2.6.1)

RE: Shell over UART between nrf52840DK and nrf9160DK not working(SDK v2.6.1)

Hakon — Tue, 05 Nov 2024 13:46:07 GMT

It could be. It seems like it is inserting characters in the wrong positions in the buffer all the time. The shell library is a big mess so it's hard to understand where it goes wrong.

RE: Shell over UART between nrf52840DK and nrf9160DK not working(SDK v2.6.1)

harry4951 — Fri, 25 Oct 2024 17:49:57 GMT

Hmmm strange, do you think it is a bug in the library?

RE: Shell over UART between nrf52840DK and nrf9160DK not working(SDK v2.6.1)

Hakon — Fri, 25 Oct 2024 15:38:34 GMT

I made one for observation. It seems like the command is being written to the wrong position in the command buffer. I still don't know why it happens.

RE: Shell over UART between nrf52840DK and nrf9160DK not working(SDK v2.6.1)

Hakon — Sun, 20 Oct 2024 17:09:04 GMT

It looks like the shell commands received are somehow altered, this is when both cables are connected;

This with one cable disconnected;

You can see that in the first case there are some characters inserted that makes the command different and thus not triggering the callback. I guess when the nRF9160 is sending as well as receiving, somehow this buffer is overwritten.

RE: Shell over UART between nrf52840DK and nrf9160DK not working(SDK v2.6.1)

harry4951 — Fri, 18 Oct 2024 11:41:55 GMT

I cant use the flow control, since this setup will be applied to our custom PCB, which only has TX and RX lines.

RE: Shell over UART between nrf52840DK and nrf9160DK not working(SDK v2.6.1)

Hakon — Fri, 18 Oct 2024 11:08:56 GMT

Checked a few things, but I'm still not sure why this happens. Have you tried enabling flow control on the shell uart?

RE: Shell over UART between nrf52840DK and nrf9160DK not working(SDK v2.6.1)

harry4951 — Thu, 17 Oct 2024 11:41:35 GMT

Thanks for the investigating, any progess?

RE: Shell over UART between nrf52840DK and nrf9160DK not working(SDK v2.6.1)

Hakon — Tue, 15 Oct 2024 15:55:12 GMT

[quote user=""]if both cable 1 and 2 are connected, no output from either side.[/quote]

I'm testing this now, and I get data occasionally when both cables are connected. I still don't know the reason but I will do some more debugging.

RE: Shell over UART between nrf52840DK and nrf9160DK not working(SDK v2.6.1)

harry4951 — Tue, 15 Oct 2024 12:20:03 GMT

Sure, following attached corresponds to the secario mentioned above:

if both cable 1 and 2 are connected, no output from either side.

if only cable1 plugout, nrf52840 can output the data received from nrf9160.

if only cable2 plugout, nrf9160 can output the data received from nrf52840.
devzone.nordicsemi.com/.../both-cable.sal devzone.nordicsemi.com/.../only_5F00_cable1_5F00_plugout.sal devzone.nordicsemi.com/.../only_5F00_cable2_5F00_plugout.sal

RE: Shell over UART between nrf52840DK and nrf9160DK not working(SDK v2.6.1)

Hakon — Mon, 14 Oct 2024 12:28:08 GMT

Hello,

I will have a look. In the mean time, would it be possible to get a logic trace from the uart pins?