nRF52840 programming

RE: nRF52840 programming

ketiljo — Mon, 16 Dec 2019 14:16:51 GMT

Make sure the J-link have the latest firmware. SDIO is not used for programming. You need VDD from the board to be programmed to the J-Link as well, to make sure the J-link detects the boards. What error message do you get?

RE: nRF52840 programming

Jagbir — Fri, 13 Dec 2019 20:57:56 GMT

I was able to program this nRF52840-DK using another nRF52840-DK . However, I am still unable to program this DK using a Segger J-link plus. I have checked my cable connection again, they seem to be fine. I have also tried an external pull up on SDIO but still it does not work.

RE: nRF52840 programming

ketiljo — Thu, 12 Dec 2019 09:25:27 GMT

As others say, you don't need the Atmel chip on your board. Only a connection to the SWD interface is needed. So break out SWDIO, SWCLK, GND and VDD to a suitable connector, for instance a 10 pin J-link connector, 6 pin needle adaptor or whatever you like. Then use a JLink programmer or the DK you already have

RE: nRF52840 programming

Jagbir — Wed, 11 Dec 2019 19:26:05 GMT

Thanks Thomas,

Other than the BOM/PCB space are there any other pros/cons of using an external Jlink vs an on board chip .I am new to SES/Jlink .In your opinion which one of J-Link (edu,base ,plus) provides best experience and does not require additional tools for nRF52.

RE: nRF52840 programming

Jeff4BLE — Wed, 11 Dec 2019 19:05:02 GMT

If you use the Debug Out port of the nRF52840-DK, or any Nordic DK, to connect to your custom PCB for programming and debugging. If the hardware detects power on Debug Out, the nRF device on the DK is not programmed or controlled.

Cheers

RE: nRF52840 programming

thomas.l — Wed, 11 Dec 2019 18:05:13 GMT

Why would you need a board. A Segger JLink is about everything you need.