nrf52832 2 pin debugger

[mercimek]

Hello, I'm making a PCB project with nrf52832 and I want to use my debuggers only 2 pins(SWDCLK and SWDIO) to debug it. I have J-Link Edu, but I wonder if I can use it with the new PCB only using SWD pins. Is it possible to connect it this way and not connect J-Links GND and Vcc? If it's not work with my debugger, could you please recommend me a new one?

Thank you

[dev_000]

J-Link Edu should work fine but you would need to connect 4 wires: SWDCLK, SWDIO, VTref and GND between your custom PCB and the J-Link Edu to make it work.

[mercimek]

but what if I want to use only 2 pins, is there any debugger work with two pins?

[dev_000]

Not that I know of. You need Vtref and GND for providing references.
Any particular reason why you want to have just 2 pins?

[Andreas]

Hi,

 

All have the 4 mentioned pins or inputs, but I suppose the Vtref and GND_detect is mainly used to set level shifters in the debugger and detect that there is a target connected. It might work to connect the Vtref to another VDD source that has the same level, and short the GND_Detect pin to ground. You will probably need your devices to share ground for this to work.

 

Best regards,

Andreas