Cannot connect to external nRF52832, no idcode detected

[ronpetit]

Hello, I'm trying to write code to a custom PCB with a nRF52832 using the nRF52 DK and the following wiring:

However, everytime I try to connect the JLink is says that there is an error and that no idcode detected, see this screenshot below:

So, I'm doing something wrong?, I can write code to the internal nRF52832 chip, I noticed that the onboard chip is a nRF52832_XXAA and mine is nRF52832_XXAB, however I changed the project options to select that target and still the error shows up, I think there's something wrong with the SWDIO and SWCLK pins, as if I disconnect those from my custom board I just get the same error without noticeable changes, anyone can help me?

[ronpetit]

Yes, on my custom board I have a standard ARM coresight of 10 pins, however I have no wires to attach it to the Debug Out on the DK, are you sure is incorrect to use P20 instead?, I can try to find a connector that fits

[awneil]

ronpetit said:

find a connector that fits

https://uk.farnell.com/samtec/ffsd-05-d-04-00-01-n/ribbon-cable-idc-1-27mm-4inch/dp/2308531?CMP=i-ddd7-00001003

[ronpetit]

I still don't get why the P20 pins are not working, I will try out that cable to see if it works

[Nguyen Hoan Hoang]

You can find the cable here https://www.tindie.com/products/hnhoan/ribbon-cable-15-cm-6-long/

select the 10 pins 1.27mm pitch.

You can use the P20 for sure but the wiring on your 10 pins connector does not seem correct.  See pin out here http://www.keil.com/support/man/docs/jlink/jLink_connectors.htm

[ronpetit]

I still can't, my 10 pin connector on my board doesn't have the standard ARM coresight, so the pins positions is not the same as the debug out on the DK, I really need to stick with the P20, but still don't get what is wrong with my nRF52832 and why the JLink cannot connect to it