Detect and flash a custom board with a nRF5340 chip on it.

[lcj]

When I get a custom board, how do I detect and flash it? I have three options on the board:

I have a USB cable with:

• GND
• D+
• D-
• +5V

OR can configure the usb cable connection for:

• GND
• SWCLK
• SWDIO
• +5V

OR pins directly on the board:

• GND
• SWDCLK
• SWDIO
• Reset
• VCC

I do have a segger j-link as well.

[Priyanka]

Hi Leo,

It is always recommended to use the SWD connections when programming a custom board. The Reset pin is not required. So I would say this option:

• GND
• SWCLK
• SWDIO
• +5V

You can take a look at the two options mentioned in this link, for programming your custom board :https://docs.nordicsemi.com/bundle/ug_nrf5340_dk/page/UG/dk/hw_debug_out_segger53.html 

Regards,

Priyanka