nRF52832 custom boad logging

Question

Hi! 
 we're just finishing the layout for a custom nRF52832 board. On the custom board we have a connector for SWDIO and SWCLK to flash the firmware. Can we use theese 2 pins also for logging, or do i also need PIN 6 for UART logging? What pins are needed for RTT logging? 
 
 Kind regards

Mishka · Accepted Answer

Seems as simple as that. Moreover, you may use any free GPIO pin closest to the UART connector on your PCB, not limiting to the pin 6 only. It's a good practice to create your own board definitions file and declare the TX_PIN_NUMBER and other stuff (like LEDs and buttons) there. For examples please see sdk/components/boards/ header files. 
 But please also note, despite it may be not so critical for TX + GND only, some cables have 5V logic level which is way above allowed 3.6V for the nRF52832. It might be good idea to check that before connecting the cable. Another thing to outline is that this configuration suggest no hardware, no software flow control. Indeed, there is no CTS/RTS, as well as no ability to send XON/XOFF. In some cases this may screw up the terminal. 
 Finally, the nRF52 DK offers full UART pinout on pins P0.5 through P0.8. The UART example may be used to test the cable connection. After setting it up with the DK, the code may be used to test the custom board.

nRF52832 custom boad logging

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