DK buttons and LEDs

Data Structures
struct	button_handler

Macros
#define	DK_NO_LEDS_MSK   (0)
#define	DK_LED1   0
#define	DK_LED2   1
#define	DK_LED3   2
#define	DK_LED4   3
#define	DK_LED1_MSK   BIT(DK_LED1)
#define	DK_LED2_MSK   BIT(DK_LED2)
#define	DK_LED3_MSK   BIT(DK_LED3)
#define	DK_LED4_MSK   BIT(DK_LED4)
#define	DK_ALL_LEDS_MSK
#define	DK_NO_BTNS_MSK   (0)
#define	DK_BTN1   0
#define	DK_BTN2   1
#define	DK_BTN3   2
#define	DK_BTN4   3
#define	DK_BTN1_MSK   BIT(DK_BTN1)
#define	DK_BTN2_MSK   BIT(DK_BTN2)
#define	DK_BTN3_MSK   BIT(DK_BTN3)
#define	DK_BTN4_MSK   BIT(DK_BTN4)
#define	DK_ALL_BTNS_MSK

Typedefs
typedef void(*	button_handler_t) (uint32_t button_state, uint32_t has_changed)
	Callback that is executed when a button state change is detected.

Functions
int	dk_leds_init (void)
	Initialize the library to control the LEDs.
int	dk_buttons_init (button_handler_t button_handler)
	Initialize the library to read the button state.
void	dk_button_handler_add (struct button_handler *handler)
	Add a dynamic button handler callback.
int	dk_button_handler_remove (struct button_handler *handler)
	Remove a dynamic button handler callback.
void	dk_read_buttons (uint32_t *button_state, uint32_t *has_changed)
	Read current button states.
uint32_t	dk_get_buttons (void)
	Get current button state from internal variable.
int	dk_set_leds (uint32_t leds)
	Set value of LED pins as specified in one bitmask.
int	dk_set_leds_state (uint32_t leds_on_mask, uint32_t leds_off_mask)
	Set value of LED pins as specified in two bitmasks.
int	dk_set_led (uint8_t led_idx, uint32_t val)
	Set a single LED value.
int	dk_set_led_on (uint8_t led_idx)
	Turn a single LED on.
int	dk_set_led_off (uint8_t led_idx)
	Turn a single LED off.

Detailed Description