programming nRF52832 via SWD

[daguro]

I am trying to program an nRF52832 on an nRF52DK via the Debug in port (P18).

I am driving it with an STM32L073.

Should I put the nRF52832 into reset via the Debug in port before attempting to reset the line and select SWD mode?

My steps are to write 50 1's on the data line, send the select magic number 0xe79e and follow it with 50 1's.

I then try to read the IDCODE register (DP register 0

Packet request is 10100001

After the turnaround, I don't see the nR52832 drive the line at all.

Edit: added screenshot of two nRF52dk's doing reset

[run_ar]

Here is a question with information on how to interface the nRF52832 using SWD.

[daguro]

Yes, I saw that question.

The document Serial Wire Port Debug Interface for nRF52 is not clear in some areas.

Could someone at Nordic connect up a logic analyze to a debug port, show a connection and post the screen shot?

[daguro]

I got another nRF52dk and attached the debug out on one board to the debug input on the other. I connected a logic analyzer so I could see the traffic go across. I have attached that screen shot. To the best of my knowledge, using three reset phases is not documented anywhere.

[run_ar]

The document is work in progress, most likely it will become a blogpost eventually.

[run_ar]

I cannot see the screenshot.