Custom NRF51822 board Not showing in nrfgo

RE: Custom NRF51822 board Not showing in nrfgo

vineeshvs — Fri, 30 Oct 2015 18:35:25 GMT

Our nRF51822AA based MDBT40 chip worked when we connected 32MHz and 12pF (or 22pF) capacitor

RE: Custom NRF51822 board Not showing in nrfgo

kirkus — Sun, 03 May 2015 18:56:06 GMT

I had a similar situation (custom dev board), and nrfjprog worked fine, but Studio (1.19) keeps giving "no device detected". Thanks for the nrfjprog tip.

RE: Custom NRF51822 board Not showing in nrfgo

Nguyen Hoan Hoang — Tue, 16 Dec 2014 20:44:29 GMT

Strange, if the tag does not work,you won't even get to the programming screen. There are also issues with nRFgo with the version of softdevice. You are using softdevice v6. Try with older version of nRFgo.

RE: Custom NRF51822 board Not showing in nrfgo

Greg Winn — Tue, 16 Dec 2014 20:16:32 GMT

I get the same J-Link ARM DLL issue:

"An error condition was detected in the JLinkARM DLL"

This is trying to flash the SoftDevice S110. "s110_nrf51822_6.2.1_softdevice.hex"

RE: Custom NRF51822 board Not showing in nrfgo

Nguyen Hoan Hoang — Tue, 16 Dec 2014 18:12:53 GMT

Your Jtag is working already by adding that 100K. You need to download the softdevice from nordicsemi.com. It comes with a hex file. Start flashing that first. The DLL error you are getting is normal when softdevice is not there, DFU crashes.

RE: Custom NRF51822 board Not showing in nrfgo

Greg Winn — Tue, 16 Dec 2014 16:25:00 GMT

Locky, I have swapped out the 12pF for 18pF caps but with no success. Was really hoping that was the issue. Do i have any other glaring issues with the schematic?

RE: Custom NRF51822 board Not showing in nrfgo

Greg Winn — Sat, 13 Dec 2014 03:27:57 GMT

Locky!! I think this is the issue. Your very first point "I would check to make sure that you have selected the correct load capacitor values for your crystals."

I have 12pF caps and in fact the 16Mhz crystal needs 18pF. The 32.768 crystal takes 12pF....

My question is would that be enough to cause this issue?

RE: Custom NRF51822 board Not showing in nrfgo

Greg Winn — Sat, 13 Dec 2014 03:14:58 GMT

Locky, Thanks so much for the answer!

I will check to make sure.
This is an interesting idea, I think it was an over sight! I will make the correction for sure.
Yes the J-Link is seeing the target voltage.
I am using a desktop power supply
Will do, thank you!

RE: Custom NRF51822 board Not showing in nrfgo

Locky — Fri, 12 Dec 2014 19:14:48 GMT

I would check to make sure that you have selected the correct load capacitor values for your crystals.
Shouldn't C6 be attached to the AVDD and AVDD_2 pins? Perhaps since this pin does not have a capacitor, thus you have a odd race condition on power-up (highly highly unlikely at these capacitor values).
As mentioned, make sure the J-Link can see the Vcc on the target board ( 3.0V or greater). Correct pinout
How are you supplying power to the target board? Its possible the coin-cell battery has a high IR, thus the Vcc voltage pulls down below 3.0V under current consumption during start-up.
Outside of these, start doing continuity checks on all you critical traces. Verify the footprint on the nRF51822 and crystals (and load caps). Finally triple check your cable connection to the target board is the correct wiring.

Keep us posted.

RE: Custom NRF51822 board Not showing in nrfgo

Stefan Birnir Sverrisson — Fri, 12 Dec 2014 13:11:43 GMT

For further information on external pulldown resistor on SWDCLK, look at this thread. How to download the softdevice is described e.g. in the nRF51822 Development Kit User Guide v1.4, section 3.2

RE: Custom NRF51822 board Not showing in nrfgo

Nguyen Hoan Hoang — Fri, 12 Dec 2014 02:25:10 GMT

Yes, keep the Pulldown. That is what makes your jtag working. The softdevice comes from the S110, s120 or whatever you want to use. You download it from nordicsemi.com. The hex file is in there. That is the first thing you need to flash in before anything else.

RE: Custom NRF51822 board Not showing in nrfgo

Greg Winn — Fri, 12 Dec 2014 01:52:49 GMT

OK so to be clear, I am going to keep the 100k pulldown on the swdclk and try to flash the softdevice. Is there a default hex I should use for this in the SDK?

RE: Custom NRF51822 board Not showing in nrfgo

Nguyen Hoan Hoang — Fri, 12 Dec 2014 01:34:58 GMT

Try to add another pullup this time on the SWDIO. I guest your PCB is noisy. Try also add bypass caps. Skip the pullup for now. I just saw something on your screen. You can't just flash in your app like that. You need first flash in the softdevice. I see that you didn't have the softdevice. It has to be flashing first.

RE: Custom NRF51822 board Not showing in nrfgo

Greg Winn — Thu, 11 Dec 2014 21:37:27 GMT

Nguyen, I am seeing mixed results now... After disconnecting everything and reconnecting it I am seeing NRFGo to read the board! But what i am now getting is an issue with the J-Link ARM DLL.

"An error condition was detected in the JLinkARM DLL"

RE: Custom NRF51822 board Not showing in nrfgo

Greg Winn — Thu, 11 Dec 2014 20:54:11 GMT

Thanks Nguyen, I added a 100k pulldown to the SWDCLK but with no luck. I have added a screenshot of NRFGo and the J-Link window so you can see more detail.

RE: Custom NRF51822 board Not showing in nrfgo

Nguyen Hoan Hoang — Thu, 11 Dec 2014 18:32:05 GMT

Try to add a 100K pulldown on the SWCLK near the chip.

RE: Custom NRF51822 board Not showing in nrfgo

Greg Winn — Thu, 11 Dec 2014 17:22:50 GMT

I am able to program the dev kit board shown here: devzone.nordicsemi.com/.../

So I know my J-Link is working... The issue has to be with the custom board in some way... I will add the schematics to my original question.

RE: Custom NRF51822 board Not showing in nrfgo

Greg Winn — Thu, 11 Dec 2014 17:16:08 GMT

Ok, after hooking it to a power supply and giving it 3.3v I am now getting "Could not power up debug port: Control/Status register reads FFFFF477".

RE: Custom NRF51822 board Not showing in nrfgo

Greg Winn — Thu, 11 Dec 2014 17:07:11 GMT

Stefan, Thank you for the answer, I have checked the SWD connection and all is correct on the custom board. I did have the board on battery power (~2.85v) while i was trying to program. I will connect a power supply for 3.3v and try again.

RE: Custom NRF51822 board Not showing in nrfgo

Stefan Birnir Sverrisson — Thu, 11 Dec 2014 13:31:21 GMT

From your description I suspect that the connection to J-Link LITE is good but the connection from the J-Link Lite is not working. I see two possible reasons:

J-Link Lite requires 3.3V supply voltage on the target, so make sure the correct voltage is supplied to the custom board.
The SWD interface is not connected correctly. The correct configuration is described here.

Also, how to connect a programmer to the Beacon kit is described on this thread.

RE: Custom NRF51822 board Not showing in nrfgo

Greg Winn — Wed, 10 Dec 2014 15:56:12 GMT

No, says:

"No device on JTAG chain." "No device found on SWD" Then it fails to ID the target also using 4kHz slow speed.

RE: Custom NRF51822 board Not showing in nrfgo

Knut Eldhuset — Wed, 10 Dec 2014 07:13:04 GMT

Can you access the chip using the command line tool "nrfjprog" that is provided?