CC2652P: What is raw serial command to ping or get version on ot-rcp?

YiKai Chen

Part Number: CC2652P

Tool/software:

We would like to know what is raw serial command to ping or get version of ot-rcp running on Cc2652P. We don’t want to run otbr-agent to check this when doing production test. Thanks.

2 months ago

+1 Toby 2 months ago

TI__Mastermind 32830 points

Hello Yikai,

By "ping", do you mean:

Sending a network ping (e.g. one Thread device to another Thread device)
Host to make sure a single RCP is running

I can setup an otbr-agent and monitor the RCP UART RX/TX lines.
Will provide an update for that within 5 business days.

Thanks,
Toby

0 YiKai Chen 2 months ago in reply to Toby

Guru 735545 points

No, I actually want to know host spinel command to ping or get version of ot-rcp running on CC2652P. It is nothing to do with network ping.

0 Toby 2 months ago in reply to YiKai Chen

TI__Mastermind 32830 points

Ok, understood. I will check this for the "get version" command then.

0 YiKai Chen 2 months ago in reply to Toby

Guru 735545 points

Ok, will wait your solution. Thanks.

0 YiKai Chen 2 months ago in reply to Toby

Guru 735545 points

@Toby do you have any update on this?

0 Toby 2 months ago in reply to YiKai Chen

TI__Mastermind 32830 points

Not yet, will try to have an update by tomorrow.

0 Toby 2 months ago in reply to YiKai Chen

TI__Mastermind 32830 points

For some reason I don't see any UART activity when I run "rcp version".

It seems this value is being cached somehow to reduce overall serial traffic.

Attached is the UART capture between OTBR and RCP (OTBR is running on RPi).

rpi powerup sequence.sal

One of those transactions may be handling the "rcp version" command.

Do you have an OTBR setup, and if yes, can you observe the same thing when you try to run "rcp version" between your OTBR and RCP?

Alternatively could make sense to look into how the RCP RX side (to see how it handles commands sent).

0 YiKai Chen 2 months ago in reply to Toby

Guru 735545 points

Hi Toby, It's difficult to hack into this. Can you check internally again about the exact serial command?

0 Toby 2 months ago in reply to YiKai Chen

TI__Mastermind 32830 points

Agreed, it is a bit tricky... appreciate the patience.
I'm checking with someone internally if they can help.

Will update within 5 business days.

0 YiKai Chen 2 months ago in reply to Toby

Guru 735545 points

Hi Roby,

Do you have any update on this?

+1 Toby 2 months ago in reply to YiKai Chen

TI__Mastermind 32830 points

Hi Yikai,

I investigated further.

It seems default otbr will cache some info at the start, so not every "version" will cause a serial transaction.

So I tried a test script, pyspinel: https://github.com/openthread/pyspinel

Using this, I was able to capture the "version" command well, and parsing the RCP TX line, I could see the exact same info printed by the host.

After pyspinel README set, I set interface to the RCP like this: " spinel-cli.py -u "/dev/ttyACM0" -n 1"

Logic analyzer shot with parsed signals:

2577.pyspinel_version_parsed.sal

RCP UART RX (sent from host):

Setting for UART parsing in the logic analyzer:

Output from the host side (pyspinel):

Thanks,
Toby

0 YiKai Chen 1 month ago in reply to Toby

Guru 735545 points

Hi Toby, we have checked this solution and can confirm it works. Thanks for your great support.

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CC2652P: What is raw serial command to ping or get version on ot-rcp?