https://devzone.nordicsemi.com/f/nordic-q-a/17387/nrf52-contiki-bl652-mapping-issueHi, We tried to run the blinky example in the contiki source tree, and we had a strange behaviour. The example code is here , and the hardware is here . The issue is that the mapped LED1-4 and BUTTON1-4 mapped in the source code doesn&#39;t corresponden-USTelligent Community 13Fri, 28 Oct 2016 06:41:00 GMThttps://devzone.nordicsemi.com/thread/66842?ContentTypeID=1Fri, 28 Oct 2016 06:41:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6da59ee6-ed3d-4c6d-b64d-05ee3be7209bJ&#248;rgen Holmefjord<p>Hi,</p> <p>On the nRF52-DK, the button and LEDs are <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52/dita/nrf52/development/dev_kit_v1.1.0/hw_btns_leds.html?cp=2_0_0_1_4">connected to pins P0.13-P0.20</a>.</p> <p>Did you test it on the BL652 DevKit or some other board? From the <a href="http://cdn.lairdtech.com/home/brandworld/files/Datasheet%20-%20BL652.pdf">BL652 Datasheet</a> I can only find these two LED and Button mappings:</p> <pre><code>Pin # Pin Name nRF52832 QFN Pin nRF52832 QFN Name Comment 13 SIO_11 14 PO.11 Laird Devkit: BUTTON1 29 SIO_15 18 PO.15 Laird Devkit: BUTTON2 30 SIO_17 20 PO.17 Laird Devkit: LED1 31 SIO_19 22 PO.19 Laird Devkit: LED2 </code></pre> <p>I&#39;m not sure about the pin-mappings in Contiki, that you should ask Contiki developers/community about.</p> <p>Best regards, Jørgen</p><div style="clear:both;"></div>