nRF52382 not connect to j-link(EDU)

RE: nRF52382 not connect to j-link(EDU)

Håkon Alseth — Wed, 13 Jun 2018 13:56:30 GMT

Hi,

Sorry for the late reply. I checked internally, and this is not something that we have seen before.

The SWDIO pin is bidirectional, meaning it can be both input and output seen from both the debugger and the nRF.

It looks like the the debugger overrides the output from the nRF, thus you only get a small "ripple" with the response from the nRF. Does this happen often in the trace? Normally, the segger connect procedure does several re-tries if it fails to connect.

Best regards,

Håkon

RE: nRF52382 not connect to j-link(EDU)

kic84 — Fri, 08 Jun 2018 06:19:22 GMT

Hi, Håkon

I find cause of my problem.

(A yellow signal is "SWDIO" and blue signal is "SWCLK")

A red rectangle in this pictre is ACK signal ( nRF52 -> J-link).

The voltage level of this ACK signal is 3.3V ~2.5V.

Thus, this signal is all "High vlotage".

I am checking and thinking to solve this problem.

Now I focus on "Pull-up registance".

(I am aware that nrf 52 has internal pull-up registance.)

Thanks!!

kic84

RE: nRF52382 not connect to j-link(EDU)

Håkon Alseth — Thu, 07 Jun 2018 11:50:36 GMT

Hi,

The JLink EDU shall be close to equal to the JLink Base, just with a more limited license targeted for education purposes only.

I assume this board has been pre-programmed with an example application during the production stages. Even if readback protection has been enabled, you should be able to recover the board using "nrfjprog --recover".

Unfortunately, I do not have a feather board, so I cannot check this, but this seems very strange. As long as the SWD header is present, your process should work without any issues.

Have you tried this on another computer, in case there are some PC software related issues causing this behavior?

Best regards,

Håkon

RE: nRF52382 not connect to j-link(EDU)

kic84 — Thu, 07 Jun 2018 09:21:46 GMT

Hi, Håkon

Thanks for your Replys.

1. I have not ever been success to connect nRF52 and j-link.

Thus, I have not ever program to these boards.

but feader-board is normal.

beacause I did scan BLE-signal using my smart-phone when the feader-board be turn on.

2. I have one more "feader-board", but it's same state.

thus I did order "nRF52-DK" last week.

I do not find my mistake point.

Also, I am considering to order j-link base version.

But I am afraid that the problem will be solved.

Because the price of J-link base version is very high....

Thanks!!

kic84

RE: nRF52382 not connect to j-link(EDU)

Håkon Alseth — Thu, 07 Jun 2018 08:19:13 GMT

Hi,

Thanks for the picture of the setup. Everything looks connected correctly.

Have you at some point been able to program this board?

Do you have other boards that behave equally?

By looking at the logs, both JLinkCommander and nrfjprog is not able to contact the nRF.

Best regards,

Håkon

RE: nRF52382 not connect to j-link(EDU)

kic84 — Thu, 07 Jun 2018 00:29:10 GMT

Hi, Håkon

1. I use 2x5 pin header on theh feather-board.

Also I tried connection with jumper cable(http://warefab.com/product/53/)

J-Link Edu --- feather-board

1 - VTarget --- Vcc

4 - GND --- GND

7 - TMS --- SWDIO

9 - TCK --- SWCLK

2. this is a picture of my setup

Thanks

kic84

RE: nRF52382 not connect to j-link(EDU)

Håkon Alseth — Tue, 05 Jun 2018 11:32:17 GMT

Hi,

Are you using the 2x5 pin header on the feather-board to connect your debugger or are you connecting the debugger in another way?

VDD seems to be sampled correctly (~3.3V), so your board is powered within a valid level for both debugger and nRF. Do you have a picture of your setup?

Best regards,

Håkon