Connecting J-Trace with the nRF52DK

[brolive]

Hi there,

I'm sorry if I'm asking something very simple:

How does one connect the J-Trace Pro to the nrf52 DevKit in such a way that I can get ETM functionalities? Obviously with the SWO connector via Debug-in, you can't get ETM.
Is there any pin-map for this or some special adapter required?

Thank you for your help

Oliver

[Vidar Berg]

Hi,

I think you will find these blog posts useful:

- https://devzone.nordicsemi.com/nordic/b/blog/posts/debugging-nrf52-series-devices-using-trace

- https://devzone.nordicsemi.com/nordic/b/blog/posts/nrf52-tutorial-etm-instruction-trace-with-keil-mdk

And the pin mapping is documented in the PS here: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/dif.html?cp=3_1_0_15_4#trace

[brolive]

I'm afraid it doesn't really, I've red them already. In the picture of the first post mentioned, there is an adapter which isn't described where to be bought or what pins it maps where to. Could you please elaborate on how the connection is supposed to be made from a 2x 10 JTAG to these pin headers on the DevKit?

I know the pin mapping of the JTAG as described here on page 335 of the J-Link_J-Trace PDF. (or image below)

-2:320:50]

And I know the pin mapping of the nRF52DK as shown in the map below.

But how do these two match?

E.g. where do pin numbers:

• 8
• 1
• 11 & 13

of the JTAG Cortex-M Adapter Map to on the DevKit?

[Vidar Berg]

I think you will need a custom adapter or find an adapter which you can solder on jumper wires to connect to the trace pins. Here's a similar thread on this subject: link. 

52832 Pin assignments for trace 

17	P0.14 TRACEDATA[3]	Digital I/O	General purpose I/O Trace port output
18	P0.15 TRACEDATA[2]	Digital I/O	General purpose I/O Trace port output
19	P0.16 TRACEDATA[1]	Digital I/O	General purpose I/O Trace port output
20	P0.17	Digital I/O	General purpose I/O
21	P0.18 TRACEDATA[0] / SWO	Digital I/O	General purpose I/O Single wire output Trace port output
22	P0.19	Digital I/O	General purpose I/O
23	P0.20 TRACECLK	Digital I/O	General purpose I/O Trace port clock output

So P0.14 should be connected to TRACEDATA[3], P0.15 to TRACEDATA[2], and so forth.

[brolive]

Thank's the link to the other subject helped a lot, since there are the Schematics & Altium files of this particular adapter.