Button control functions

This module provides button control functions with short/long press detection. More...

Macros
#define	BUTTON_SHORT_CLICK_MSEC   500
#define	BUTTON_LONG_CLICK_MSEC   2000

Typedefs
typedef void(*	button_click_handler_t) (button_click_t click)
	Button click handler type.

Enumerations
enum	button_click_t { BUTTON_CLICK_SHORT = 0 , BUTTON_CLICK_LONG }
	Detected button click type. More...

Functions
int	button_init (void)
	Initialize the button module and its GPIO ISR.
void	button_reg_click_handler (button_click_handler_t click_handler)
	Register a click handler.

Detailed Description

This module provides button control functions with short/long press detection.

The button module uses a GPIO interrupt service routine (ISR) to detect button state changes (press / release) and a delayable work item for debouncing and timing. It distinguishes two types of clicks based on press duration:

• SHORT click: press duration shorter than BUTTON_SHORT_CLICK_MSEC
• LONG click: press duration longer than BUTTON_LONG_CLICK_MSEC

Presses released between BUTTON_SHORT_CLICK_MSEC and BUTTON_LONG_CLICK_MSEC are intentionally ignored (no click is reported). This dead band helps prevent accidental activations from presses that are neither a deliberate short tap nor a sustained long press.

A LONG click is reported as soon as the long-press threshold elapses while the button is still held; the subsequent release is then suppressed. A SHORT click is reported on release.