https://devzone.nordicsemi.com/f/nordic-q-a/122257/nrf52840dk-to-custom-board-debuggingI’ve designed and fabricated two custom boards around the nRF52840 SoC. I use an nRF52840 DK as an SWD debugger to communicate with each board. Using nrfjprog , I can read from and write to on-chip registers—including REG0 for VTG—via commandsen-USTelligent Community 13Fri, 13 Jun 2025 13:14:03 GMThttps://devzone.nordicsemi.com/thread/539215?ContentTypeID=1Fri, 13 Jun 2025 13:14:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:882d8f27-a552-497f-90a6-7c226821d1e8Abhineet<p>I have been trying to upload the default blinky code by just changing the gpio pin number, I have 5 gpio pins from pin no P0.25 to P0.30 I have tried changing all the gpio pins but still I&#39;m unable to see the led blink at any of the 5 gpio pins..</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/539183?ContentTypeID=1Fri, 13 Jun 2025 11:08:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5ab7b0f3-2d76-4eee-a8fa-b0d7ed6a856bSusheel Nuguru<p>Hi,</p> <p>If you are able to flash and do memread using a debugger then I would suggest you to run the debugger and step through your code to see if you are actually setting the GPIOs for those LEDs to the state you want. It would also help you would probe those pins using Logic analyzer or oscilloscope to see if the pins have any activity or not. At this point, with the given information, it is not clear if your application boots or if the GPIOs are configured right.</p><div style="clear:both;"></div>