Dealing with recalibration during 'long' presses

[minimism]

Do you have any hints about how I can manage 'long presses' when recalibration is enabled (the default)?

What I think I am seeing is recalibration whilst a user is holding the button (for, let's say 10 seconds). When the user finally releases the button, the action is not detected, and from then on the button is 'dead' until I reset my board.

The documentation says that recalibration is triggered when the threshold is exceeded for touched_max_nom, and I wondered if there was a counter setting where if no touch was detected for a certain period, recalibration would be triggered?

At the moment I am disabling recalibration (set touched_max_nom to 255), but I am worried that environmental changes might make the buttons less responsive over time (the circuit is supposed to be in use for > 12hrs).

Hopefully I just missed a piece of documentation :)

[MX682X]

Hello!

About the long presses - disabling the recalibration, as you did, is the way to go.

I wondered if there was a counter setting where if no touch was detected for a certain period, recalibration would be triggered?

kinda. There is a "slow" drift of the reference (nominal around 512 digits) that is adjusted up and down slowly as long as it is not registered as touched. The number of measurements until a change by 1 happens is set with drift_up_nom and drift_down_nom.

You have to make sure, that the value is not too low, otherwise a slowly approching finger will lead to an increase of the reference and the touch will fail to register.

If the reference value drifts away from 512 by more then the value in force_recal_delta (default 150), a recalibration takes place. (Recalibration referes to recalculating the reference capacitance)

You can monitor the reference value of a node with node.reference.