key_combo_util.h

/*$$$LICENCE_NORDIC_STANDARD<2016>$$$*/

#ifndef __KEY_COMBO_UTIL_H__
#define __KEY_COMBO_UTIL_H__

#include "app_util.h"
#include "nrf.h"
#include "nrf_section.h"
#include "event_bus.h"

typedef void (*key_combo_handler_t)(void * p_context);

typedef struct
{
 uint8_t combo_keys[4]; 
 uint32_t combo_duration_ms : 30;
 uint32_t combo_num_keys : 2;
 key_combo_handler_t handler; 
} key_combo_desc_t;

typedef union
{
 uint8_t key_id; 
 uint32_t padding; // Must be Word-sized
} key_combo_member_t;

// Verify that structs are Word sized
STATIC_ASSERT((sizeof(key_combo_desc_t) % sizeof(uint32_t)) == 0);
STATIC_ASSERT((sizeof(key_combo_member_t) % sizeof(uint32_t)) == 0);

#define KEY_COMBO_MEMBER_REGISTER(_key_id) \
 NRF_SECTION_ITEM_REGISTER(combo_member_keys, static const key_combo_member_t CONCAT_2(_COMBO_MEMBER, __LINE__)) = \
 {.key_id = _key_id}

#define KEY_COMBO_ONE_KEY_REGISTER(key_id_1, duration_ms, evt_handler) \
 NRF_SECTION_ITEM_REGISTER(combo_descriptions, static const key_combo_desc_t CONCAT_2(evt_handler, _combo_cb)) = \
 { \
 .handler = evt_handler, \
 .combo_keys = {key_id_1, 0xFF, 0xFF, 0xFF}, \
 .combo_num_keys = 1, \
 .combo_duration_ms = duration_ms \
 }
 
#define KEY_COMBO_TWO_KEY_REGISTER(key_id_1, key_id_2, duration_ms, evt_handler) \
 NRF_SECTION_ITEM_REGISTER(combo_descriptions, static const key_combo_desc_t CONCAT_2(evt_handler, _combo_cb)) = \
 { \
 .handler = evt_handler, \
 .combo_keys = {key_id_1, key_id_2, 0xFF, 0xFF}, \
 .combo_num_keys = 2, \
 .combo_duration_ms = duration_ms \
 }

#define KEY_COMBO_THREE_KEY_REGISTER(key_id_1, key_id_2, key_id_3, duration_ms, evt_handler) \
 NRF_SECTION_ITEM_REGISTER(combo_descriptions, static const key_combo_desc_t CONCAT_2(evt_handler, _combo_cb)) = \
 { \
 .handler = evt_handler, \
 .combo_keys = {key_id_1, key_id_2, key_id_3, 0xFF}, \
 .combo_num_keys = 3, \
 .combo_duration_ms = duration_ms \
 }
 
ret_code_t key_combo_util_init(void);

bool key_combo_util_key_process(const event_t * p_event);

#endif /* __KEY_COMBO_UTIL_H__ */