LED works inverse with nrf_gpio_pin_set/clearhttps://devzone.nordicsemi.com/f/nordic-q-a/8878/led-works-inverse-with-nrf_gpio_pin_set-clearWhen I call nrf_gpio_pin_set(LED_1), the LED is turned off and when I call nrf_gpio_pin_clear(LED_1) it is turned on. Is this expected behaviour? I can&#39;t find any schematics for my board so it&#39;s not even possible to verify which way the LEDs are connecteden-USTelligent Community 13Tue, 25 Aug 2015 06:38:40 GMTRE: LED works inverse with nrf_gpio_pin_set/clearhttps://devzone.nordicsemi.com/thread/32658?ContentTypeID=1Tue, 25 Aug 2015 06:38:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:de8b2378-2c30-4943-9fdc-0430b004b3f5Susheel Nuguru<p>changed the title to reflect your question. This is useful info.</p><div style="clear:both;"></div>RE: LED works inverse with nrf_gpio_pin_set/clearhttps://devzone.nordicsemi.com/thread/32660?ContentTypeID=1Tue, 25 Aug 2015 06:15:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c563b9a5-18fe-49a5-8aa6-b63571730ab2Wojciech Jasko<p>Schematic should be on the bottom of your board or check define LEDS_INV_MASK.</p><div style="clear:both;"></div>RE: LED works inverse with nrf_gpio_pin_set/clearhttps://devzone.nordicsemi.com/thread/32659?ContentTypeID=1Mon, 24 Aug 2015 22:24:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1d2651f7-2088-4643-b2ee-597934272e5eCarlos<p>On the nRF51 DK all 4 LED&#39;s anode are connected to VIO, so the behaviour your are getting is the expected. Find schematic files <a href="https://www.nordicsemi.com/eng/nordic/download_resource/38675/5/10918048">here</a>.</p> <p><img src="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/ledsnrf51.png" alt="LEDs on nRF51DK" /></p><div style="clear:both;"></div>