Nrf52840 preview dk not getting detected

[nileshpassi]

I have brought nrf52840 preview dk ,it is not getting detected by the computer nor its power led getting light up. Last code i  tested  on its was blinky.

I doubt it has any hardware issue as i have not interfaced any device  with the dk.

I have also checked the test point  around switching circuit on dk it was ok.

[Stian Røed Hafskjold]

Put nRF power source switch in the VDD position. Make sure that SW6 is in DEFAULT position and SW10 is set to ON.

Try to replace the USB cable. And make sure it's connected to J2 not "nRF USB"

I would recommend getting a newer version of the DK. The preview DK has an early engineering version of the chip which has lots of issues.

[nileshpassi]

I have done the setting as you have but nothing change, why is the led 5 is not getting light up and why it is not getting detected by the computer,can you help on the test point , so that i can verify whether it is getting  the correct voltage at correct point if it is then it has to be a software issue.

[Stian Røed Hafskjold]

First check VBUS (USB voltage) on TP11. I'm measuring 4.1V.

Measure the USB_DETECT signal on the positive side of R26 (located next to the nRF ONLY switch). It should be 3V.

Check VDD and 5V on the P13 header. They should be 3V and 5V

If there are no issues above you should now have 3V on VDD and 3V on !IF_MCU_DISCONNECT which  is controlling VDD_SAM which powers the ATSAM that powers the power LED. So check if you have 3V on VDD_SAM. You can do that by measuring on SB37. It should be 3V on both sides.

You can download the DK schematics here: https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-DK/Download#infotabs

[sborman]

Quit the Arduino IDE if you happen to have it open.

I ran into this problem of a new NRF 52840 DK not connecting to my Mac.  Nothing showed up even after following the useful suggestions here.  The problem I found was that I had the Arduino IDE open on my Mac.

Solution:

Quit the Arduino IDE application. Disconnect the DK. Reconnect the DK.  Turn it on.

You should see the DK show up under "Locations" in the Finder sidebar as "JLINK".

You should also see the device on the USB tree as follows (some lines removed for clarity):

% ioreg -p IOUSB
+-o Root  <class IORegistryEntry, id 0x100000100, retain 17>
  +-o AppleUSBXHCI Root Hub Simulation@14000000  <class AppleUSBRootHubDevice, id 0x100000346, registered, matched, active, busy 0 (2 ms), retain 19>
    +-o J-Link@14300000  <class AppleUSBDevice, id 0x10001e5ca, registered, matched, active, busy 0 (44 ms), retain 19>