Need help finding documentation or tutorial that explains USB CDC ACM.

[Jerry Easley]

I want to create a virtual com port on my pc from my nRF52840 dongle program. And direct the output of printx statements to it so I can monitor it with putty.

I have tried very diligently to search for this information on your website; I get covered up with hits, all, seemingly irrelevant. For the life of me I don't understand how anyone ever finds anything in your documentation.  I can search on terms like "nRF52 USB CDC ACM tutorial" and your search engine ignores the quotes and I get over 700 hits.

I have also tried to search your examples for this information with no success.  Why is it so dang hard to find information here?

Jerry

[Sigurd Hellesvik]

Hi, I will look into this case and return with more information tomorrow

Regards,
Sigurd Hellesvik

[Sigurd Hellesvik]

Jerry Easley said:

he following is a program from the BLE tutorial

Which BLE tutorial?

I can search on terms like "nRF52 USB CDC ACM tutorial" and your search engine ignores the quotes and I get over 700 hits.

As an alternative, you can use google with "site". It sometimes returns better results.

To create a sample which might be useful to you, I did the following:

nRF Connect SDK v2.3.0.

Use the Hello World sample as a base.

Copy the app.overlay and prj.conf from Console over CDC ACM UART Sample into Hello World.
Add usb_enable() to hello world.
Add hello world printk into loop

I tested this on a DK, so I think that it should work on the dongle as well:

hello_world_over_cdc_acm.zip

Regards,
Sigurd Hellesvik

[Jerry Easley]

The BLE tutorial, "

Bluetooth Low Energy Fundamentals

" is here: https://academy.nordicsemi.com/topic/blefund-lesson-2-exercise-1/

You can get the example programs here: https://github.com/NordicDeveloperAcademy/bt-fund.git

Each Lesson Exercise comes with two source files a student working copy and a solution copy; I am working with the solution copy.

I am sure the solution you provided will work for me; I haven't had a chance to try it; I'll try it straight away and give you some feedback. Thank you so much for your efforts.

Regards,

Jerry

[Jerry Easley]

Hi Sigurd,

Your example works great! Thank You ever so much!

Regards,

Jerry

[Jerry Easley]

Well, maybe I spoke too quickly; the code works great on my nrg52840-dongle but not on my dk; on the dk it doesn't even cause the pc device drive to create a virtual com port.  Any ideas? 

By the way, my earlier ramblings about the BLE Tutorial sample program doing all this stuff mysteriously, I had a faulty test for operation and didn't understand what I was looking at; let's just pretend I never said it.

[Sigurd Hellesvik]

Jerry Easley said:

Well, maybe I spoke too quickly; the code works great on my nrg52840-dongle but not on my dk; on the dk it doesn't even cause the pc device drive to create a virtual com port.  Any ideas? 

On the DK, you need to connect the "nRF USB" connector.

Jerry Easley said:

By the way, my earlier ramblings about the BLE Tutorial sample program doing all this stuff mysteriously, I had a faulty test for operation and didn't understand what I was looking at; let's just pretend I never said it.

Good thing I read this message first then, now I do not even have to read the other one. Thanks for the update.

Regards,
Sigurd Hellesvik

[Jerry Easley]

Hi Sigurd,

You're a genius!  Thanks so much!  

Regards,

Jerry