EBCS Button Module

Compounds
struct	button_stat_t
Defines
#define	GEL_MAX_BUTTONS   4
Typedefs
typedef unsigned short	button_t
typedef unsigned char	button_mask_t
Enumerations
enum	button { BUTTON_1 = 0, BUTTON_2 = 1, BUTTON_3 = 2, BUTTON_4 = 3 }
enum	key_mode { KEY_PRESS, KEY_RELEASE }
Functions
void	button_initialize (void)
button_mask_t	button_get_pressed (void)
void	button_enable (void)
void	button_disable (void)
int	button_is_enabled (void)
Variables
event_def	button_change_event

Enumeration Type Documentation

enum button

Button enumeration. Definition at line 39 of file buttons.h.

Function Documentation

void button_disable (  void    )

Disable the polling of buttons. Disable the polling of buttons. This operation must be called before sending LCD commands. Otherwise, these commands can disturb the button polling. The accumulator interrupts (PA7) are disabled and the button timers are deactivated. See also: button_enable

void button_enable (  void    )

Enable the polling of buttons. Enable the polling of buttons. The button are scanned periodically and their state can be queried using button_get_pressed or by waiting for button events. The accumulator interrupts (PA7) are enabled and the button timer is activated. While buttons are polled, the application must not print on the LCD panel. It is necessary to disable the polling. See also: button_disable, button_get_pressed

button_mask_t button_get_pressed (  void    )

Return a mask for pressed buttons. Returns: the mask identifying pressed buttons See also: button_enable, button_disable

void button_initialize (  void    )

Initialize the button module. Configure the button module. This function must be called once before any other. After initialization, the button polling is disabled. See also: button_enable, button_disable, button_get_pressed

int button_is_enabled (  void    )

Return true if the buttons are enabled. Returns: 1 if the buttons are enabled. See also: button_enable, button_disable

Variable Documentation

struct event_def button_change_event

Button change event. The button change event is triggerred each time the state of the buttons change. It is activated when a button is pressed or when a button is released. Definition at line 124 of file buttons.h.