File content as of revision 0:28fb3e9ef81a:

//=================================
// microbit_switch_if_3sw
//=================================
//    BLE switch interface with 3 tact switches for micro:bit 
//    The MIT License (MIT)   Copyright (c) 2018 Masatomo Kojima

#include "mbed.h"
#include "MicroBit.h"
#include "ble/services/BatteryService.h"
#include "KeyboardService.h"
#include "Keyboard_types.h"
#include "HIDServiceBase.h"
#include "HIDDeviceInformationService.h"

//----------------------
//  Keybord
//----------------------
const char KEY_BS    = 8;  /* Keyboard Backspace */
const char KEY_TAB   = 9;  /* Keyboard Tab */
const char KEY_ENTER = 10; /* Keyboard Return (Enter) */
//const char KEY_ESC = 27;   /* Keyboard Escape */
const char KEY_SPACE = 32; /* Keyboard Space */

//----------------------
//  Setting
//----------------------
#define NUM_GROUP1         6
#define NUM_GROUP2         5

#define MODIF_CTRL     0x100
#define MODIF_SHIFT    0x200
#define MODIF_ALT      0x400  /* alt or option */
#define MODIF_COMMAND  0x800  /* command or Windows */

const int keyCodeGroup0[2] = {      // Button A B
   'A', 'B'   
};
const int keyCodeGroup1[NUM_GROUP1][2] = { // Switch 1 2
    {KEY_SPACE,  KEY_ENTER},
    {MODIF_ALT + DOWN_ARROW, MODIF_ALT + UP_ARROW},
    {RIGHT_ARROW, LEFT_ARROW}, 
    {DOWN_ARROW, UP_ARROW},
    {'1', '3'},
    {'h', 'j'}
};
const int keyCodeGroup2[NUM_GROUP2]= {  // Switch 2
    KEY_TAB,
    MODIF_COMMAND + 'r',    // 再読み込み
    RIGHT_ARROW,
    LEFT_ARROW, 
    MODIF_ALT + DOWN_ARROW
};

//in "BLE_API\Keyboad_types.h"
//enum FUNCTION_KEY {
//    KEY_F1 = 128,   /* F1 key */
//    KEY_F2,         /* F2 key */
//    KEY_F3,         /* F3 key */
//    KEY_F4,         /* F4 key */
//    KEY_F5,         /* F5 key */
//    KEY_F6,         /* F6 key */
//    KEY_F7,         /* F7 key */
//    KEY_F8,         /* F8 key */
//    KEY_F9,         /* F9 key */
//    KEY_F10,        /* F10 key */
//    KEY_F11,        /* F11 key */
//    KEY_F12,        /* F12 key */
// 
//    KEY_PRINT_SCREEN,   /* Print Screen key */
//    KEY_SCROLL_LOCK,    /* Scroll lock */
//    KEY_CAPS_LOCK,      /* caps lock */
//    KEY_NUM_LOCK,       /* num lock */
//    KEY_INSERT,         /* Insert key */
//    KEY_HOME,           /* Home key */
//    KEY_PAGE_UP,        /* Page Up key */
//    KEY_PAGE_DOWN,      /* Page Down key */
// 
//    RIGHT_ARROW,        /* Right arrow */
//    LEFT_ARROW,         /* Left arrow */
//    DOWN_ARROW,         /* Down arrow */
//    UP_ARROW,           /* Up arrow */
//};

//----------------------
//  Display
//----------------------
#define TIME_TURN_OFF          7.0   // 非表示モードに入るまでの時間 (s)
#define SETTING_DISPLAY_WAIT   1.0   // 設定モード表示時間 (s)

//----------------------
//  State
//----------------------
#define STATE_NORMAL        0    // 通常起動時
#define STATE_SETTING       1    // パラメータ設定時
#define STATE_OPERATING     2    // 操作時

//----------------------
// Disable debug messages by setting NO_DEBUG
//----------------------
#ifndef NO_DEBUG
#define DEBUG(...) printf(__VA_ARGS__)
#else
#define DEBUG(...)
#endif

//----------------------
//  BLE & HID
//----------------------
/**
 * IO capabilities of the device. During development, you most likely want "JustWorks", which means
 * no IO capabilities.
 * It is also possible to use IO_CAPS_DISPLAY_ONLY to generate and show a pincode on the serial
 * output.
 */
#ifndef HID_SECURITY_IOCAPS
#define HID_SECURITY_IOCAPS (SecurityManager::IO_CAPS_NONE)
#endif

/**
 * Security level. MITM disabled forces "Just Works". If you require MITM, HID_SECURITY_IOCAPS must
 * be at least IO_CAPS_DISPLAY_ONLY.
 */
#ifndef HID_SECURITY_REQUIRE_MITM
#define HID_SECURITY_REQUIRE_MITM false
#endif

/**
 * Initialize security manager: set callback functions and required security level
 */
void initializeSecurity(BLE &ble);

/**
 * - Initialize auxiliary services required by the HID-over-GATT Profile.
 * - Initialize common Gap advertisement.
 *
 * Demos only have to set a custom device name and appearance, and their HID
 * service.
 */
void initializeHOGP(BLE &ble);