https://devzone.nordicsemi.com/f/nordic-q-a/19642/why-is-gpiote-interrupt-triggered-twice-when-button-is-pressedI&#39;m working with pca10028. Then gpiote interrupt is triggered twice. Why is this happening? And what is BUTTONx_EXT connected to PCAL6408A(U7) in schematics?en-USTelligent Community 13Mon, 13 Feb 2017 08:44:11 GMThttps://devzone.nordicsemi.com/thread/76440?ContentTypeID=1Mon, 13 Feb 2017 08:44:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c6d51018-9267-4b7b-9be6-b1e934827877J&#248;rgen Holmefjord<p>You can read about the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52/dita/nrf52/development/dev_kit_v1.1.0/hw_io_ext_btns_leds.html?cp=2_2_2_3_1_4_0">I/O expander for buttons and LEDs</a> in the PCA10040 documentation. This part is the same for both PCA10028 and PCA10040.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/76439?ContentTypeID=1Mon, 13 Feb 2017 07:53:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ce4ed467-13f1-4ad2-a259-9a819f96d1bfJoonDong<p>Thank you. I review sense function, and understand it. Bun can you tell me about BUTTONx_EXT connected to PCAL6408A(U7) in schematics</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/76438?ContentTypeID=1Mon, 13 Feb 2017 06:23:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:539624f6-1020-4d1c-b5bb-b45c8dc134c1Daniel.Chiu<p>press &amp; release or just press?</p> <p>The app_button is used GPIOTE sense toggle, it can trigger by HI to LO and LO to HI, if you want detector single edge, you can replace &quot;GPIOTE_CONFIG_IN_SENSE_TOGGLE&quot; to &quot;GPIOTE_CONFIG_IN_SENSE_HITOLO&quot; or &quot;GPIOTE_CONFIG_IN_SENSE_LOTOHI&quot; in app_button_init function</p><div style="clear:both;"></div>