Sending data to NRF52 over PCA10040/SWO

RE: Sending data to NRF52 over PCA10040/SWO

John Waters — Wed, 08 Sep 2021 08:45:36 GMT

What I mentioned works (JLinkExe + netcat). 🙂

If someone has a better idea in one command, I'll take it.

Anyway, thank you very much for your help Jonathan.

RE: Sending data to NRF52 over PCA10040/SWO

JONATHAN LL — Wed, 08 Sep 2021 08:41:57 GMT

Hi, I have not tested this but i belive it should be possible. You will have to start a rtt-session regardless so i believe something along the lines of : start a JLink instance then echo in to localhoste.

Good luck!

RE: Sending data to NRF52 over PCA10040/SWO

John Waters — Wed, 08 Sep 2021 07:37:15 GMT

What I can do is start JLinkExe, and in parallel use netcat on localhost 19021.

$ JLinkExe ... &

$ echo "cmd1\ncmd2" | netcat localhost 19021

I wish I could do both with one program. Something like:

echo "cmd1\ncmd2" | rtt_sender

RE: Sending data to NRF52 over PCA10040/SWO

JONATHAN LL — Tue, 07 Sep 2021 08:27:47 GMT

Hi John,

I don't have a proper answer here for the last question, my best bet would be to have a script running that uses the terminal to do the things you want.

Regards,
Jonathan

RE: Sending data to NRF52 over PCA10040/SWO

John Waters — Mon, 06 Sep 2021 12:04:07 GMT

Thank you so much. I can indeed send and receive data using the functions in SEGGER_RTT.h.

Last question. I would like to send data automatically. Is there a way to do it using Command Line only?

RE: Sending data to NRF52 over PCA10040/SWO

JONATHAN LL — Fri, 03 Sep 2021 09:00:14 GMT

Hi,

If SWDIO and SWDCLK is the only two options then RTT what you need to use.

Any pins that is a general purpose IO could be used for communication.

Regards,
Jonathan

RE: Sending data to NRF52 over PCA10040/SWO

John Waters — Thu, 02 Sep 2021 14:24:48 GMT

Thank you very much for your answer.

It seems the information I gave above is incorrect.

The pins we use are VDD [A7], SWDIO [G1], SWDCLK [F1] and ground (on BGA), and they're connected to the PCA10040.

Is something doable with this setup only? (since flashing and getting RTT logs is possible, I assumed sending data also was, and it seems JLinkRTTViewer can send data). That would be very convenient for our product.

If not, to be sure, are you suggesting we should add pins 21/H2 and 24/H1 to have a UART connection?

RE: Sending data to NRF52 over PCA10040/SWO

JONATHAN LL — Thu, 02 Sep 2021 13:35:02 GMT

Hi,

You have a custom board and the only pins you have access to is (if it is a QFN packager) pin 21, pin 24, pin 25 and pin 26 ?

Then you can use serial communication like UART on pin 21 and 24, they are general purpose IO.

Regards,
Jonathan