https://devzone.nordicsemi.com/f/nordic-q-a/10093/connecting-existing-custom-pcb-to-nrf51-dkHello, I have an existing microprocessor application that I want to test with the nrf51822. I am currently using a different BLE chip. I do not want the trouble of porting my application to the Atmel chip on the nrf51-DK. Is it possible to directlyen-USTelligent Community 13Thu, 05 Nov 2015 07:22:56 GMThttps://devzone.nordicsemi.com/thread/37427?ContentTypeID=1Thu, 05 Nov 2015 07:22:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fef3c4f3-f210-4a0e-ac44-51918f6089e1RK<p>Port what to the Atmel? The Atmel chip on-board is just a Segger, to provide a standard way to program and debug the chip, plus a UART/USB interface which provides a serial port if you wish to use it. There&#39;s no porting to be done there. If you want to you can connect your own debugger to the Debug In header, as long as it&#39;s the ARM mini-10 pin header any debugger you like works. And you can connect your board to any of the GPIO lines which surround the board, even the ones used for the USB serial port are available if you aren&#39;t using it.</p><div style="clear:both;"></div>