Test development using CLI/python/RTT

RE: Test development using CLI/python/RTT

Tim Adu — Fri, 31 Jan 2020 10:59:31 GMT

Great! I igot it working with python 3.x. Need to tweak the script for my own tests, but the basic read and write from both ends works! I have enough to get me running. Thanks Jørgen!

RE: Test development using CLI/python/RTT

Jørgen Holmefjord — Fri, 31 Jan 2020 09:12:57 GMT

Yes, I tested with Python 2.7.15. I see from the release notes that pynrfjprog should support Python 3.6 at least, but you may have to modify the example to use it with Python 3.x.

RE: Test development using CLI/python/RTT

Tim Adu — Thu, 30 Jan 2020 16:17:30 GMT

Looks like it's working. I just have one issue with the python environment (I use python 3.x). Did you test the scripts with python 2.x?

RE: Test development using CLI/python/RTT

Jørgen Holmefjord — Thu, 30 Jan 2020 11:50:37 GMT

I started out with the UART peripheral example. However, I do not think that any part of that example is used in the project I uploaded, so it should not really matter.

RE: Test development using CLI/python/RTT

Tim Adu — Thu, 30 Jan 2020 10:36:03 GMT

Thanks Jørgen, and apologies for the late response. I've been sidetracked by other tasks. Now I finally have time for this.

I currently use SDK 15.2.0. What peripheral example did you start with? (I'd like to have as close to your setup as possible to avoid nasty surprises).

RE: Test development using CLI/python/RTT

Jørgen Holmefjord — Wed, 04 Dec 2019 14:10:56 GMT

Yes, that should work similarly. I updated the examples with read in application and write in Python script:

devzone.nordicsemi.com/.../rtt_5F00_reader_5F00_writer_5F00_sdk_5F00_16.0.0.zip

devzone.nordicsemi.com/.../rtt_5F00_writer.py

RE: Test development using CLI/python/RTT

Tim Adu — Tue, 03 Dec 2019 14:58:13 GMT

Thanks, I'll give this a try.

In the meantime I noticed that the script you sent primarily does RTT reading, and the firmware does RTT write. Is the reverse possible (writing using the script, and reading using the firmware)?

RE: Test development using CLI/python/RTT

Jørgen Holmefjord — Tue, 03 Dec 2019 14:18:51 GMT

I have not experienced this. I did a test with a modified peripheral example, and a custom pynrfjprog sample. This seems to work as expected.

devzone.nordicsemi.com/.../rtt_5F00_writer_5F00_sdk_5F00_16.0.0.zip

devzone.nordicsemi.com/.../rtt_5F00_reader.py

Did you SEGGER_RTT_CONFIG_MAX_NUM_UP_BUFFERS/SEGGER_RTT_CONFIG_MAX_NUM_DOWN_BUFFERS in your sdk_config.h file?

RE: Test development using CLI/python/RTT

Tim Adu — Tue, 03 Dec 2019 10:55:09 GMT

Okay, so I tried using Channel 1 (both in my python script and firmware), Everytime I run the script, I hit a breakpoint in the code. Specifically, this breakpoint (in cmsis_gcc.h) is hit everytime I send a string from the script:

__attribute__((always_inline)) __STATIC_INLINE void __SEV(void)
{
  __ASM volatile ("sev");
}

And the program halts. Is this expected?

RE: Test development using CLI/python/RTT

Tim Adu — Mon, 02 Dec 2019 15:11:01 GMT

What does it take to use a different channel? I just read this post: https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/multiple-channels-in-rtt

Does it paint the full picture?

RE: Test development using CLI/python/RTT

Jørgen Holmefjord — Mon, 02 Dec 2019 13:24:46 GMT

RTT supports mulitple channels. If you want to keep logging, use another channel than 0 for the test communications.
Yes, this makes sense to me.

RE: Test development using CLI/python/RTT

Tim Adu — Mon, 02 Dec 2019 12:36:16 GMT

Hi Jørgen,

I would like to avoid the middleman (CLI) and just use pynrfjprog directly.

I plan to use the pynrfjprog read and write functions directly as you suggested. However, on the firmware side, I'm considering one potential issue: my logger uses the RTT backend. Would I have to disable the logger?
As for implmentation, would it make sense to use a repeating timer to call SEGGER_RTTRead() and have a task (I'm using FreeRTOS) decode the command, since there is no interrupt to tell when data is received in the RTT buffer?

Tim

RE: Test development using CLI/python/RTT

Jørgen Holmefjord — Mon, 02 Dec 2019 12:11:45 GMT

Hi Tim,

If you want to continue using CLI over RTT for your communication with the board, you can look into our pynrfjprog library. This enables you to read and write RTT channels from a python script.

Best regards,
Jørgen