(UART) Log Output Through Debug Out

Question

Hi
I have an external board featuring an nRF52832 connected to the nRF52DK via the Debug Out port on the DK and a 6 pin connector on the external board. I can program the external MCU just fine, but I cannot read debug output that I'm logging via UART. What do I need to do to get this to work?

endnode · Accepted Answer

For UART you need separate wires (typically just one for Tx is fine for beginning). On nRF5x DK boards there are certain PINs from nRF5x target on the board connected to ATMEL companion chip with SEGGER J-Link OB (or mbed) FW which forwards it over USB as emulated serial port so you can simply connect that PIN from your external board to the UART Tx PIN ( it's P0.06 according to the documentation ) on nRF52 DK and you should be fine. Just be sure that internal target on nRF52 DK is erased so it doesn't interfere with your external input...