Problem with DK-52840 on-board debugger ATMEL ATSAM3U2C

[Fyodor Prokopovich]

Hi, I have DK-52840 where the ATMEL ATSAM3U2C is the on-board debugger. I replace firmware via my J-LINK ULTRA+ JTAG through 10-pin connector on-board, I used J-Link Commander V6.40. I took the firmware "J-Link OB-SAM3U128-V2-NordicSemi 170724.bin"  from the official page and it was successful done. But after power supply through USB nothing works and the computer doesn't see the OB J-Link. What's wrong?

[Jared]

Hi,

I'm not sure I understand the the situation correct, did you try using the on-board 10 pin connector to flash an application to the nRF?

• Could you try the nrfjprog command nrfjprog -i ,  and see if your device is recognized?
• If the device is not listed, see this post.

best regards

Jared 

[awneil]

It sounds like he's reprogrammed the onboard JLink chip - so it no longer works as a JLink ?

[Fyodor Prokopovich]

Yes, after automatic update OB-Jlink my development board dk52840 ceased to be recognized by USB, and i decided to replace OB-Jlink firmware via my J-LINK ULTRA+ JTAG through 10-pin connector on-board (J-Link Commander see Cortex-M3 core (ATSAM3U2C)). All successfully completed, but dev board didn't work: pc doesn't see UART or USB, nrfjprog doesn't see ob-jlink, LED doesn't shine, RESET doesn't help