https://devzone.nordicsemi.com/f/nordic-q-a/24922/ble-example-not-working-on-external-targetHello, I have a custom board with a Taiyo Yuden chip (it integrates an nRF51822 QFAC chip, 2 crystals and the BLE antenna). I program it using SWD. I succesfully uploaded code to this board, blinking leds and logging over RTT. I programmed a softdeviceen-USTelligent Community 13Wed, 06 Sep 2017 13:34:13 GMThttps://devzone.nordicsemi.com/thread/98143?ContentTypeID=1Wed, 06 Sep 2017 13:34:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:776d2501-7a5f-4001-badf-db0439c1569bLouis<p>Thank you very much. I have found that it was caused by an issue with the crystals used in our module : the crystals are 32kHz and 32MHz instead of 16 MHz in the development kit. As a result, it is needed to change a register in the chip with : nrfjprog.exe --memwr 0x10001008 --val 0xFFFFFF00 (erased when softdevice is erased).</p> <p>However, we have issues with the range of bluetooth so we are updating our design : I will send it to you when it is done in order to check that it is correct.</p> <p>Thank you very much for your quick support.</p> <p>Best regards</p> <p>Louis</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/98142?ContentTypeID=1Wed, 06 Sep 2017 08:59:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:95d04fa4-5325-4ef1-bb3a-127757f9d646J&#248;rn<p>Hello Louis</p> <p>Considering everything seems to be functioning as it should, with the exception of the radio communication, we will need to see the schematics and layout of your custom board. You can upload them here to the original question, or if your project is confidential you can create a mypage ticket at <a href="http://www.nordicsemi.com/">nordicsemi.com</a></p> <p>Best regards</p> <p>Jørn Frøysa</p><div style="clear:both;"></div>