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.

[Sigurd]

Hi,

bardia3000 said:

Is it normal for the P0.21/nRST to be Low in this situation?

No, in this situation the pin should not be low.

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

[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/