nRF52832 cannot connect to J-Link

RE: nRF52832 cannot connect to J-Link

Jørgen Holmefjord — Mon, 13 Feb 2017 14:54:37 GMT

Can you upload a screenshot of the directory where nrfjprog is located and the output in cmd when you run nrfjprog?

RE: nRF52832 cannot connect to J-Link

Kewal Vora — Sun, 12 Feb 2017 06:19:21 GMT

I have already added the path. Even after executing the command from nrfjprog directory, I received the same error message.

RE: nRF52832 cannot connect to J-Link

Jørgen Holmefjord — Mon, 06 Feb 2017 20:05:53 GMT

It looks like nrfjprog cannot be found. Can you try adding the path to nrfjprog to the PATH environment variable? You could also try executing the nrfjprog commands from inside the nrfjprog directory.

RE: nRF52832 cannot connect to J-Link

Kewal Vora — Mon, 06 Feb 2017 16:06:30 GMT

Output:

C:\nRF5_SDK_11.0.0_89a8197\examples\peripheral\blinky\pca10040\blank\armgcc>make
rm -rf _build
echo  Makefile
Makefile
mkdir _build
Compiling file: system_nrf52.c
Compiling file: main.c
Compiling file: nrf_delay.c
Assembly file: gcc_startup_nrf52.s
Linking target: nrf52832_xxaa.out
make[1]: Entering directory 'C:/nRF5_SDK_11.0.0_89a8197/examples/peripheral/blinky/pca10040/blank/armgcc'
Preparing: nrf52832_xxaa.bin
Preparing: nrf52832_xxaa.hex

   text    data     bss     dec     hex filename
   3108     112      28    3248     cb0 _build/nrf52832_xxaa.out

make[1]: Leaving directory 'C:/nRF5_SDK_11.0.0_89a8197/examples/peripheral/blinky/pca10040/blank/armgcc'

C:\nRF5_SDK_11.0.0_89a8197\examples\peripheral\blinky\pca10040\blank\armgcc>nrfjprog --family <nRF52> -e
The system cannot find the file specified.

C:\nRF5_SDK_11.0.0_89a8197\examples\peripheral\blinky\pca10040\blank\armgcc>

RE: nRF52832 cannot connect to J-Link

Jørgen Holmefjord — Mon, 06 Feb 2017 12:07:12 GMT

What do you mean by "It allows me to create makefiles"? Can you paste exactly what shows when you run nrfjprog in the commandline? Or upload a screenshot showing the terminal output.

RE: nRF52832 cannot connect to J-Link

Kewal Vora — Sat, 04 Feb 2017 05:34:41 GMT

Yes I have installed the command line tools. It allows me to create makefiles. The error doesn't specify which file is not found.

RE: nRF52832 cannot connect to J-Link

Jørgen Holmefjord — Fri, 03 Feb 2017 08:19:57 GMT

Did you install the nRF5x Command Line Tools? Which file can the system not find?

RE: nRF52832 cannot connect to J-Link

Kewal Vora — Fri, 03 Feb 2017 07:09:07 GMT

I tried reflashing the firmware, still no luck. Even tried other methods mentioned in that post, they didn't work either. Also, when I try to run the command "nrfjprog --family <nRF51/52> -e" from the armgcc folder where the makefiles are created, it says "The system cannot find the file specified.

RE: nRF52832 cannot connect to J-Link

Jørgen Holmefjord — Thu, 02 Feb 2017 10:00:35 GMT

Could you try reflashing the firmware of the Jlink OB interface chip as described in this post?

RE: nRF52832 cannot connect to J-Link

Kewal Vora — Wed, 01 Feb 2017 16:20:55 GMT

Yes, infact I copy pasted the "blinky" hex file in the JLink drive. It programs the board just fine. I can see the LEDs blinking one after the other. The problem comes when I have to do this from eclipse.

RE: nRF52832 cannot connect to J-Link

Jørgen Holmefjord — Wed, 01 Feb 2017 08:42:14 GMT

Have you tried with another USB cable or on another computer? Is any of the LEDs on the board lit up?

RE: nRF52832 cannot connect to J-Link

Kewal Vora — Wed, 01 Feb 2017 00:47:48 GMT

Yes, it is an official nRF52 DK from Nordic

RE: nRF52832 cannot connect to J-Link

Kewal Vora — Wed, 01 Feb 2017 00:45:41 GMT

If the DK already includes JLink, should I be needing some other hardware ? Sorry for such questions, I am really new to this board.

RE: nRF52832 cannot connect to J-Link

Jørgen Holmefjord — Thu, 26 Jan 2017 09:33:17 GMT

You say in the description that you try to setup your nRF52 DK, and the post is tagged with PCA10040. Is this an official nRF52 DK from Nordic or some other custom board/3. party module?

RE: nRF52832 cannot connect to J-Link

Roger Clark — Wed, 25 Jan 2017 19:30:56 GMT

The DK includes a cut down version of JLInk, which can be used for debugging, but is not compatible with JFlash

If you are able to solder etc, I recommend you search for postings that are on various forums that describe how to revive broken Jlinks.

Btw. Depending on what dev toolchain you use, there are other debuggers, e.g. the BlackMagic probe that can be used. ( you can make a Bmp from a generic STM32 board for less than $5) But only JLink is directly integrated into Keil and IAR and even in Nordic's gcc tool.

So using anything else would take a lot more time and effort.

RE: nRF52832 cannot connect to J-Link

Kewal Vora — Wed, 25 Jan 2017 16:15:36 GMT

Yeah, I couldn't find Jlink in the "Universal Serial Bus Controllers" section. I suppose I'd get a new one and try it again. Is there any other way to debug where I don't have to use the Jlink at all, only the DK? Thanks

RE: nRF52832 cannot connect to J-Link

Roger Clark — Tue, 24 Jan 2017 22:58:21 GMT

So you Jlink is not working.

If you are running Windows, look in the device manager and confirm that you can see the JLink in the "Universal Serial Bus controllers" section (its the section at the bottom)

If you can't see the Jlink there, the chances are that its got a problem.

If you bought your Jlink from eBay or AliExpress, I know that some of these have problems.

I have my suspicions that the JLink software checks whether the Jlink has a blacklisted serial number and if so, it "bricks" it.

There are however ways to unbrick Jlinks, which have been posted on various other forums.

RE: nRF52832 cannot connect to J-Link

Kewal Vora — Tue, 24 Jan 2017 22:33:28 GMT

Yes, I did try running JLink commander. It says No emulators connected via USB. Connecting to J-Link via USB...FAILED: Can not connect to J-Link via USB.

RE: nRF52832 cannot connect to J-Link

Roger Clark — Tue, 24 Jan 2017 22:06:53 GMT

I presume you tried running JFlash or JLink commander to confirm your JLink is working