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NRF52840 USB connection

I want to connect NRF52840-pca10056 to PC via USB cable. I followed the docs but the OS doesn't detect the board automatically when plugged in. It only recognizes the board when I enter the bootloader mode, but the connection always drops after 5-15 seconds.

I tested on two different PCs (Windows 7/10) with two different cables and I get the same result.

Any ideas on what the problem is?

0 Sigurd over 5 years ago

Hi,

Try step 4 in this list.
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0 Soyal over 5 years ago in reply to Sigurd

Hi,

Thanks for the response.

I noticed that BOOTLOADER space automatically goes down from 108KB to 104KB, as can be seen in the attached video. Even if I had copied the MCU Firmware before the device gets disconnected, there's simply not enough space. I have no idea why is that.
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0 Sigurd over 5 years ago in reply to Soyal

Soyal said:
Even if I had copied the MCU Firmware before the device gets disconnected

Did you try step 4? Did you try to copy the J-LINK interface MCU firmware to the disk before it changed size ?
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