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  • Problem flashing feather via the nRF9160-DK

Hey tcwjohnson !

Yes, you should be able to program the nRF9160 Feather using the nRF9160-DK. (It’s the recommended way to do so)

Can you show how you have it connected? Is the nRF9160 Feather powered via USB when you’re programming? (that’s required here) I personally short SB24 which forces the nRF9160DK to use the external programming port. If SB24 is shorted, you don’t necessarily have to power the nRF9160 Feather externally.

Otherwise you may find yourself accidentally programming the onboard nRF9160 if the connection is not so great (or if you forget to connect the cable, etc, etc.)

Hope that helps! 😄

      jaredwolff Thank you for the quick response. Yes the nRF9160 Feather is powered via USB. The nRF9160-DK is also powered via USB. I’ll short the SB24 solder bridge and give that a go without the feather powered.

        Hi jaredwolff with SB24 shorted and without USB power to the feather the nrfjprog response has changed:

        nrfjprog –log -r
        [error]: [ nRFXX] - Device does not have an ARM debug port.

        ERROR: nrfjprog could not identify the target device. This may be due to an
        ERROR: invalid family argument, a problem with your device, or nrfjprog may
        ERROR: not yet support your device.
        ERROR: Please check the family argument passed, or upgrade nrfjprog to a more
        ERROR: recent version.

          This is from the nrf Programmer v3.0.4 console with the JLink device selected:

          20:19:49.796 Using nrf-device-lib-js version: 0.4.15
          20:19:49.796 Using nrf-device-lib version: 0.12.8
          20:19:49.796 Using nrfjprog DLL version: 10.16.0
          20:19:49.796 Using JLink version: JLink_V7.80b
          20:19:49.908 Installed JLink version does not match the provided version (V7.66a)
          20:19:57.687 Unsupported device. The detected device could not be recognized as neither JLink device nor Nordic USB device.
          20:19:57.687 Please make sure J-Link Software is installed. See https://github.com/NordicSemiconductor/pc-nrfconnect-launcher/#macos-and-linux

          Output from jlinkexe:

          jlinkexe
          SEGGER J-Link Commander V7.80b (Compiled Sep 20 2022 17:05:22)
          DLL version V7.80b, compiled Sep 20 2022 17:05:14

          Connecting to J-Link via USB…O.K.
          Firmware: J-Link OB-K22-NordicSemi compiled Dec 3 2021 15:46:55
          Hardware version: V1.00
          J-Link uptime (since boot): N/A (Not supported by this model)
          S/N: 960077407
          License(s): RDI, FlashBP, FlashDL, JFlash, GDB
          VTref=3.300V

          Type “connect” to establish a target connection, ‘?’ for help
          J-Link>connect
          Please specify device / core. <Default>: CORTEX-M4
          Type ‘?’ for selection dialog
          Device>
          Please specify target interface:
          J) JTAG (Default)
          S) SWD
          T) cJTAG
          TIF>s
          Specify target interface speed [kHz]. <Default>: 4000 kHz
          Speed>
          Device “CORTEX-M4” selected.

          Connecting to target via SWD
          Failed to attach to CPU. Trying connect under reset.
          Cannot connect to target.
          J-Link>

          This is the result of west flash –erase

          – west flash: rebuilding
          [0/18] Performing build step for ‘spm_subimage’
          ninja: no work to do.
          [⅕] Performing build step for ‘mcuboot_subimage’
          ninja: no work to do.
          – west flash: using runner nrfjprog
          – runners.nrfjprog: mass erase requested
          Using board 960077407
          – runners.nrfjprog: Flashing file: /Users/tcwjohnson/nRF9160-DEV/nfed/samples/at_client/build/zephyr/merged.hex
          ERROR: Unable to connect to a debugger.
          ERROR: The –family option given with the command (or the default from
          ERROR: nrfjprog.ini) does not match the device connected.
          NOTE: For additional output, try running again with logging enabled (–log).
          NOTE: Any generated log error messages will be displayed.
          FATAL ERROR: command exited with status 18: nrfjprog –program /Users/tcwjohnson/nRF9160-DEV/nfed/samples/at_client/build/zephyr/merged.hex –chiperase -f NRF91 –snr 960077407

          nrfjprog -v
          nrfjprog version: 10.17.3 external
          JLinkARM.dll version: 7.80b

          That’s weird. Can you send a picture of your setup? Do you have a DMM? Curious to see what 3.3V to ground is measured as while the Tag Connect is connected.

          Can you verify that the Tag Connect is good with another board? They can get finicky especially after extended use.

          Also, I’ve never seen these these exact errors. Maybe because nrfjprog is newer? My version is a bit older:

          ❯ nrfjprog -v
nrfjprog version: 10.15.1 external
JLinkARM.dll version: 7.52d
          7 months later

          Dear All,

          I have got an NRF9160-DK to program the bootloader.

          I have made the connection as below (VDD-3V)
          NRF9160DK NRF9160-Feather
          VDD(3V) <—-> VDD (3V)
          GND <—-> GND
          SWDIO <—-> SWDIO
          SWDCLK <—-> SWDCLK

          After the connection and powering up…my PROGRAMMER (from Desktop Connect) still shows NRF9160-DK and not the Custom Board.

          What am I doing wrong ?

          DO I have to put SWDSELECT to GND ?

          Cheers
          H. Jain

            A nRf9160-DK is able to switch the I/O voltage via SW9.
            For a Thingy:91 you need 1.8V, for the feather you need 3V.

            See Debug output

            If SW9 is switched to 3V, I’m able to flash a feather with the nRF9160-DK.

            Additional note:
            The reset of the jtag is not connected to the nRF9160 on the feather. After flashing you need to press RST manually.

            jainhemendrah are you manually wiring these connections? I’d highly recommend using a Tag Connect. (TC-CTX-2030NL)

            For all Nordic chips you need to have the SWD lines connected as well as the 3V/GND. You also need to power the feather via battery or 5V unless you’ve modified your nRF91DK to provide power.

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