Problem Connecting nRF5340 to EdgeImpulse

[tim3in]

I am following example in https://docs.edgeimpulse.com/docs/nordic-semi-nrf5340-dk but I cannot connect nrf5340 to EdgeImpulse studio. When I connect device via usb cabel I am able to upload the edgimpulse firmware (copied to JLink folder) but it does not connect. I am following the instruction from https://www.edgeimpulse.com/blog/collect-sensor-data-straight-from-your-web-browser.  On my computer, nRF5340 is displayed as COM6, COM7, COM8 (Bulk Interface). Anyone plz help urgently. Do I need to install any derver? Even, the device is not detected in nRF Connect v3.6.1 - Programmer.

[janjongboom]

Hi Tim, based on what I see locally you always want the last COM port (so COM8 here). Does that work? Alternatively if you open a serial monitor on COM8 at baud rate 115,200 and reset the board, do you see anything printed?

There have been some cases of the nRF5340-DK not flashing properly via drag&drop (FAIL.txt on the target afterwards), so would be good to verify that that part actually went OK.

[tim3in]

Hi Jan, thanks for reply. I followed your instructions but still not able to connect. I do not see anything on serial terminal on COM8 or even COM6 but on COM7 I can see following o/p

***** Booting Zephyr OS build zephyr-v1.14.0-3059-g03947b700989 *****
PWM and Button demo

There is no FAIL.txt file on JLINK folder. I have used the firmware from https://cdn.edgeimpulse.com/firmware/nrf5340-dk.zip.

[janjongboom]

Hi tim3in, this is not running the right firmware then. Are you grabbing the firmware from https://docs.edgeimpulse.com/docs/nordic-semi-nrf5340-dk ? It should print:

*** Booting Zephyr OS build v2.4.0-ncs1-1710-g5a7b4eb71047 ***
Using flash device: MX25R64
Hello from Edge Impulse Device SDK.
Compiled on Apr 1 2021 10:23:31
I2C Init OK

[tim3in]

Yes I have used the firmware from  https://cdn.edgeimpulse.com/firmware/nrf5340-dk.zip. But it is not working!

[tim3in]

 I have tried nRF programmer from nRF Connect but I get error "Unsupported device. The detected device could not be recognized as neither JLink device nor Nordic USB device." Why it is so.

[janjongboom]

https://docs.edgeimpulse.com/docs/nordic-semi-nrf5340-dk#failed-to-flash <-- what do you see if you run this? Maybe the device is locked or in recovery mode or something, I've seen it sometimes, you can unlock with nrfjprog (it'll tell you in thsi case). Unfortunately I don't know how this is done in nRF Connect.