https://devzone.nordicsemi.com/f/nordic-q-a/5613/no-lifesign-from-nrf51822Hi, We just recently received our (custom) board with the nrf51822. To program and debug the nRF I use the pca10028 and the debug out header. I wrote a very basic program based on the blinky example to check if I can communicate with the chip aten-USTelligent Community 13Tue, 17 Feb 2015 15:51:27 GMThttps://devzone.nordicsemi.com/thread/19676?ContentTypeID=1Tue, 17 Feb 2015 15:51:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1137f67d-3c7a-49a8-8600-7f1119f7292bnoe<p>Ok, I solved it! The problem was, that we had another (memory) version of the 822 (-aa) than the 422 (-ac). Hence I had to change the linker script from</p> <p>LINKER_SCRIPT=../../../../../../components/toolchain/gcc/gcc_nrf51_blank_xxac.ld</p> <p>to</p> <p>LINKER_SCRIPT=../../../../../../components/toolchain/gcc/gcc_nrf51_blank_xxa<strong>a</strong>.ld</p> <p>Thanks anyway!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/19675?ContentTypeID=1Tue, 17 Feb 2015 15:09:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1d33a1ff-2d9e-4ac9-be70-e1efacf7e13anoe<p>Hi! thanks for your answer. SWDIO is high after power on. I do not have any other components on that line, it is directly connected to the IC.</p> <p>I have posted the code. The formatting didn&#39;t work well, though.</p> <p>Yes, I use another define instead of -DBOARD_PCA10028 is use my own and include another header file in boards.h. This works because when I add an #error statement in my header file the compilation fails.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/19674?ContentTypeID=1Tue, 17 Feb 2015 14:47:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5729154b-1896-4b13-a996-d2e76534b7d1JohnBrown<p>Have you checked that the RESET/SWDIO pin is high? Maybe you shoud post the code. Are you using conditional compiler flags to switch between PCA10028 and your own board?</p><div style="clear:both;"></div>