J-link OB cannot find nRF52811 on custom board

[bardia3000]

Hello, I'm working on a custom board, and I use JLink OB as programmer. Whenever I try to connect to nRF52811 on the board, this happens:

I check the connections, everything looks fine, Could It be because of the firmware of my Jlink OB?

[Sigurd]

Hi,

Whenever I try to connect to nRF52811 on the board

Looking at the screenshot attached, you seem to be using a project that is configured to be used for the nRF52840.

Please try the pca10056e project instead. For the ble_app_blinky project, see the project in the folder SDK_folder\examples\ble_peripheral\ble_app_blinky\pca10056e\s112\ses

You might find the Developing for nRF52811 user guide useful. See this link: infocenter.nordicsemi.com/.../nrf52811_user_guide.html

 

[bardia3000]

Unfortunately it is the same as before.

[bardia3000]

There was a problem about this pin, I solved It, It was connected to another chip, but It can be unsoldered, now the NRST is high, but still the same problem happens, It cannot find the nrf52811.

[Sigurd]

bardia3000 said:

but still the same problem happens, It cannot find the nrf52811.

1) Do you see this issue on several custom boards, or is it only one board ?

2) Could you try to power it at 3V, and see if you are able to program it then ?

3) Also make sure that you have not accidentally switched SWDCLK and SWDIO when connecting the debugger.

[bardia3000]

1) Yes all borads are the same.

2) No there are some other chips which must be powered with 1v8.

3) I double-checked it, It is okay

[Sigurd]

bardia3000 said:

JLink OB as programmer.

What JLink OB is this ? Is it the one located on a nRF52-series DK ? If yes, what DK did you try ? nRF52832DK, nRF52840DK, etc ?

For e.g. nRF52840 DK we have this note about programming external boards:

Note: The voltage supported by external debugging/programming is VDD voltage. Normally, this is 3 V when running from USB, but if the onboard nRF52840 SoC is supplied from either USB or Li-Ion, the nRF power source switch (SW9) is in either Li-Po or USB position, and VDD can be set by the nRF52840 firmware. Make sure the voltage level of the external board matches the VDD of the nRF52840 DK.

[bardia3000]

I tried both jlink ob and jlink pro, I also set it's voltage target to both 3v3 and 1v8, does jlink need a firmware update to support nrf52811? beacause an almost same pcb with nrf52832 works fine.

[Sigurd]

bardia3000 said:

does jlink need a firmware update to support nrf52811?

 I believe support for nRF52811 was added in Jlink V6.44. You could try to download the latest version J-Link Software and Documentation Pack from https://www.segger.com/downloads/jlink/