custom target board serial data plotting

[Pepam]

Hi,

Is it somehow possible to plot data comming from external target board with nRF52, connected to nRF52 DK via swdio and swclk lines, by some data plotting program? Etc. I would like to visualize data comming from custom board with some nice graphs.

Thanks in advance!

Pepam

[awneil]

yes, that would be entirely possible.

I think Keil & Segger both have such facilities.

To be more general, it might be easier to use the UART ...

[Jørgen Holmefjord]

Hi,

One alternative could be to use pynrfjprog together with some data plotting tools in Python.

You can find examples of reading/writing data over RTT from a Python application in this post.

Best regards,
Jørgen

[awneil]

Jørgen Holmefjord said:

data plotting tools in Python

Indeed.  I think probably Python is the go-to language for such things - with matplotlib, numpy, etc?

https://www.google.com/search?q=python+data+plotting

https://learn.sparkfun.com/tutorials/graph-sensor-data-with-python-and-matplotlib

See also:

https://devzone.nordicsemi.com/f/nordic-q-a/68130/is-there-a-program-in-nordic-that-graph-the-real-time-values-of-sensors/278972#278972

[Pepam]

In Segger tools I have found J-Scope. Is this a good solution? I have read that it is necessary to include path to .elf program sketch. Is it sufficient to include .elf file which Segger embedded studio generates within project folder ? Thanks! 

[awneil]

Pepam said:

J-Scope

This: https://www.segger.com/products/debug-probes/j-link/tools/j-scope/ ?

Pepam said:

Is this a good solution?

Depends what the problem is!

Pepam said:

I have read that it is necessary to include path to .elf program

Yes, that's what the above page says - it's a debug tool, which directly accesses your variables by name.

It will need the ELF file in order to translate the variable name to actual RAM address.

But it's a Segger product - nothing to do with Nordic - so you need to contact Segger for more information or support:

https://forum.segger.com/

https://www.segger.com/support/technical-support/