https://devzone.nordicsemi.com/f/nordic-q-a/19373/nrf-sdk-external-device-not-detectedI&#39;m using nRF SDK and trying to write firmware to my prototype device. However, nRF SDK doesn&#39;t detect my prototype device. I checked the power supply to my prototype device, and looks okay.en-USTelligent Community 13Fri, 03 Feb 2017 07:49:09 GMThttps://devzone.nordicsemi.com/thread/75157?ContentTypeID=1Fri, 03 Feb 2017 07:49:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:833fe0c8-4def-420f-9e43-a9b6d2b3ad13FormerMember<p>Good that Segger J-Link Lite worked!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/75156?ContentTypeID=1Fri, 03 Feb 2017 01:39:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e32cb9be-be99-4a50-ba8e-2a00ea01375bnsugie<p>Hi Kristin,</p> <p>The problem is before programming. nRF SDK doesn&#39;t detect my custom board, which means &quot;nRF5x Programming&quot; of nRFgo Studio doesn&#39;t become active. Attached please find a slide.</p> <p>I tried to use Segger J-Link Lite instead of nRF SDK. It worked! I could program successfully.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/75154?ContentTypeID=1Thu, 02 Feb 2017 12:35:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:765c5644-97f9-4f24-ac9c-79c5c4cc4eccFormerMember<p>As I asked yesterday, which error code do you get from nrfjprog when you use nrfjprog from cmd?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/75153?ContentTypeID=1Thu, 02 Feb 2017 08:04:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d9257d10-96f6-456b-b717-bd655f0029a9nsugie<p>Here is the pin assign. No.1 VDD No.2 SWDIO No.3 GND No.4 SWCLK No.5 GND No.6 NC No.7 NC No.8 NC No.9 GND No.10 NC</p> <p>This goes to P19 of nRF SDK board.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/75155?ContentTypeID=1Thu, 02 Feb 2017 07:42:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:49cb7f50-7ced-4cb8-83c6-739ede792fc6FormerMember<p>The programmer, is it correctly connected to the board? Is it connected to SWDIO, SWDCLK, VDD (reference), and GND?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/75152?ContentTypeID=1Thu, 02 Feb 2017 00:05:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9fa4950c-3451-4e69-abfe-49055bf559abnsugie<p>Kristin,</p> <p>Thank you very much for your reply.</p> <p>The problem is that my custom board is not detected by nRF SDK.</p> <p>My custom board has own power supply. I thought, in this case, nRF SDK automatically detect my custom board. However, &quot;nRF5x Programming&quot; of nRFgo Studio doesn&#39;t become active.</p> <p>I checked the pin no.1 of connector P19 on the nRF SDK, and I could see 3.3V there.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/75151?ContentTypeID=1Wed, 01 Feb 2017 15:05:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:03a8d49f-9ab7-4f0c-a566-22e98d9af454FormerMember<p>Do you mean that it is not possible to program the chip on your custom board?</p> <p>If that is the case, which error message do you get from nrfjprog if you run <code>nrfjprog --recover -f nrf52</code> for instance?</p> <p>Could you upload schematic, layout and and picture of the board? For the schematic and layout, only the programming part is needed.</p><div style="clear:both;"></div>