why is gpiote interrupt triggered twice when button is pressed?

[JoonDong]

I'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?

[Daniel.Chiu]

press & release or just press?

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 "GPIOTE_CONFIG_IN_SENSE_TOGGLE" to "GPIOTE_CONFIG_IN_SENSE_HITOLO" or "GPIOTE_CONFIG_IN_SENSE_LOTOHI" in app_button_init function

[JoonDong]

Thank you. I review sense function, and understand it. Bun can you tell me about BUTTONx_EXT connected to PCAL6408A(U7) in schematics

[Jørgen Holmefjord]

You can read about the I/O expander for buttons and LEDs in the PCA10040 documentation. This part is the same for both PCA10028 and PCA10040.