APP_BUTTON library Can be used with external GPIO interrupt?

[AimHigh]

Hi,

Good day!

Problem statement:

TSM12 Capacitive touch sensor IC (I2C com supported) is used in our application. It has got 12 output channels and Channel 1 is a parallel output port (It can be read over I2C or it can be connected directly to the GPIO pin).  We used this Channel 1 as a Touch button input and other channels as a wheel sensor. We tried building this with GPIOTE events but this one is a power-hungry method (Also this requires fine-tuning of the debounce effect). Now, I read that the app_button library uses less power and also deals with the button debounce effect.

Query:

Can we use this Capacitive touch sensor Interrupt PIN on nRF52832(on any of the GPIO pins) with the app_button library and be able to disable other Buttons interrupts?  FYI, The soft device is used in our application.

Thank you,
AimHigh

[Kenneth]

Hi,

Sure, it is possible to use app_button yes. However you may also just use the \nRF5_SDK\examples\peripheral\pin_change_int\ as a starting point also. It is low power if you use GPIOTE_CONFIG_IN_SENSE_TOGGLE(false); to detect pin change interrupt. To avoid debounce is a problem you can just in the beginning of in_pin_handler() always check a timer value, and if it's for instance <10ms since last pin change interrupt, then discard the change.

Best regards,
Kenneth

[AimHigh]

Hi Kenneth,

Thank you, Sure we are working on that based on your suggestion. I will update further progress here.