Added M0110A support contributed by skagon@github.

- README is written with markdown notation.
- m0110.c can handles Arrow keys and Calc keys of M0110A.
- EXTRAFLAGS and EXTRALDFLAGS are added in rules.mk to give flags on make command line.

8 files changed, 354 insertions, 128 deletions

diff --git a/m0110.c b/m0110.c
index 522c3ec0d..68ce2d1c5 100644
--- a/m0110.c
+++ b/m0110.c
@@ -34,6 +34,7 @@ CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGE.
 */
+/* M0110A Support was contributed by skagon@github */
 
 #include <stdbool.h>
 #include <avr/io.h>
@@ -43,6 +44,8 @@ POSSIBILITY OF SUCH DAMAGE.
 #include "debug.h"
 
 
+static inline uint8_t inquiry(void);
+static inline uint8_t instant(void);
 static inline void clock_lo(void);
 static inline void clock_hi(void);
 static inline bool clock_in(void);
@@ -106,6 +109,23 @@ KEY EVENT:
           Moreover, the numpad keys =, /, * and + are preceded by shift-down 0x71 on press and shift-up 0xF1 on release.
           So, the data transferred by nupmad 5 is "79 2F" whereas for numpad + it's "71 79 0D".
 
+ARROW KEYS:
+    Arrow keys and Pad+,*,/,=(Calc keys) share same byte sequence and its preceding byte
+    0x71 and 0xF1 means press and release event of SHIFT. These cause very confusing situation.
+    It is difficult or impossible to tell Calc key from Arrow key with SHIFT in some cases.
+
+    Raw key events:
+            press               release
+            ----------------    ----------------
+    Left:         0x79, 0x0D          0x79, 0x8D
+    Right:        0x79, 0x05          0x79, 0x85
+    Up:           0x79, 0x1B          0x79, 0x9B
+    Down:         0x79, 0x11          0x79, 0x91
+    Pad+:   0x71, 0x79, 0x0D    0xF1, 0x79, 0x8D
+    Pad*:   0x71, 0x79, 0x05    0xF1, 0x79, 0x85
+    Pad/:   0x71, 0x79, 0x1B    0xF1, 0x79, 0x9B
+    Pad=:   0x71, 0x79, 0x11    0xF1, 0x79, 0x91
+
 SCAN CODE:
     m0111_recv_key() function returns follwing scan codes instead of raw key events.
     Scan codes are 1 byte long and bit7 is set when key is released. 
@@ -275,15 +295,62 @@ ERROR:
 
 uint8_t m0110_recv_key(void)
 {
-    uint8_t key;
+    static uint8_t keybuf = 0x00;
+    uint8_t key, key2, key3;
+
+    if (keybuf) {
+        key = keybuf;
+        keybuf = 0x00;
+        return key;
+    }
+    key = instant();  // Use INSTANT for better response. Should be INQUIRY ?
+    switch (key) {
+        case M0110_KEYPAD:
+            // Pad/Arrow keys
+            return (M0110_RAW2SCAN(instant()) | M0110_KEYPAD_OFFSET);
+            break;
+        case M0110_SHIFT_MAKE:
+        case M0110_SHIFT_BREAK:
+            key2 = instant();
+            if (key2 == M0110_KEYPAD) {
+                key3 = instant();
+                switch (key3) {
+                    case M0110_ARROW_UP:
+                    case M0110_ARROW_DOWN:
+                    case M0110_ARROW_LEFT:
+                    case M0110_ARROW_RIGHT:
+                        // Calc keys
+                        return (M0110_RAW2SCAN(key3) | M0110_CALC_OFFSET);
+                    default:
+                        // Shift + Pad/Arrow keys
+                        keybuf = M0110_RAW2SCAN(key3);
+                        return (M0110_RAW2SCAN(key) | M0110_KEYPAD_OFFSET);
+                }
+            } else {
+                // Shift + other keys
+                keybuf = M0110_RAW2SCAN(key2);
+                return M0110_RAW2SCAN(key);
+            }
+            break;
+        default:
+            // other keys
+            return M0110_RAW2SCAN(key);
+            break;
+    }
+}
+
+
+static inline uint8_t inquiry(void)
+{
     m0110_send(M0110_INQUIRY);
-    key = m0110_recv();
-    if (key == 0xFF || key == M0110_NULL)
-        return M0110_NULL;
-    else 
-        return M0110_RAW2SCAN(key);
+    return m0110_recv();
 }
 
+static inline uint8_t instant(void)
+{
+    m0110_send(M0110_INSTANT);
+    return m0110_recv();
+}
 
 static inline void clock_lo()
 {
diff --git a/m0110.h b/m0110.h
index 287c45b54..39da4ad66 100644
--- a/m0110.h
+++ b/m0110.h
@@ -54,23 +54,39 @@ POSSIBILITY OF SUCH DAMAGE.
 #   error "M0110 data port setting is required in config.h"
 #endif
 
-#define M0110_INQUIRY     0x10
-#define M0110_INSTANT     0x14
-#define M0110_MODEL       0x16
-#define M0110_TEST        0x36
-
-#define M0110_PAD         0x79
-#define M0110_NULL        0x7B
-#define M0110_TEST_ACK    0x7D
-#define M0110_TEST_NAK    0x77
-
+/* Commands */
+#define M0110_INQUIRY       0x10
+#define M0110_INSTANT       0x14
+#define M0110_MODEL         0x16
+#define M0110_TEST          0x36
+
+/* Response(raw byte from M0110) */
+#define M0110_NULL          0x7B
+#define M0110_KEYPAD        0x79
+#define M0110_TEST_ACK      0x7D
+#define M0110_TEST_NAK      0x77
+#define M0110_SHIFT_MAKE    0x71
+#define M0110_SHIFT_BREAK   0xF1
+#define M0110_ARROW_UP      0x1B
+#define M0110_ARROW_DOWN    0x11
+#define M0110_ARROW_LEFT    0x0D
+#define M0110_ARROW_RIGHT   0x05
+
+/* This inidcates no response. */
+#define M0110_ERROR         0xFF
 
 /* scan code offset for keypad and arrow keys */
 #define M0110_KEYPAD_OFFSET 0x40
-#define M0110_ARROW_OFFSET  0x60
+#define M0110_CALC_OFFSET   0x60
 
 /* convert key event raw response into scan code */
-#define M0110_RAW2SCAN(key) ((key&(1<<7)) | ((key&0x7F)>>1))
+#define M0110_RAW2SCAN(key) ( \
+    (key == M0110_NULL) ?  M0110_NULL : ( \
+        (key == M0110_ERROR) ?  M0110_ERROR : ( \
+            ((key&0x80) | ((key&0x7F)>>1)) \
+        ) \
+    ) \
+)
 
 
 extern uint8_t m0110_error;
@@ -80,5 +96,7 @@ void m0110_init(void);
 uint8_t m0110_send(uint8_t data);
 uint8_t m0110_recv(void);
 uint8_t m0110_recv_key(void);
+uint8_t m0110_inquiry(void);
+uint8_t m0110_instant(void);
 
 #endif
diff --git a/m0110_usb/README b/m0110_usb/README
deleted file mode 100644
index 6ef98757a..000000000
--- a/m0110_usb/README
+++ /dev/null
@@ -1,55 +0,0 @@
-M0110 to USB keyboard converter
-===============================
-This firmware converts the protocol of Apple Macintosh keyboard M0110 into USB.
-
-
-Connection
-----------
-You need 4P4C plug and cable to connect Teensy into M0110.
-Teensy port F0 is assigned for CLOCK line and F1 for DATA by default, you can change pin configuration with editing config.h..
-
-Plug:
-    http://en.wikipedia.org/wiki/Modular_connector#4P4C
-
-Pinout:
-    http://www.kbdbabel.org/conn/kbd_connector_macplus.png
-    1(Black):   GND
-    2(Red):     CLOCK
-    3(Green):   DATA
-    4(Yellow):  +5V
-
-
-
-Build Frimware
---------------
-Optionally edit Makefile and config.h for build options, pin configuration or MCU.
-
-$ cd m0110_usb
-$ make
-and program your Teensy with loader.
-
-
-
-Keymap
-------
-You can change a keymap by editing code of keymap.c like following.
-How to define the keymap is probably obvious. You can find  key symbols in usb_keycodes.h.
-
-This is a default keymap for M0110.
-,---------------------------------------------------------.
-|  `|  1|  2|  3|  4|  5|  6|  7|  8|  9|  0|  -|  =|Bacpa|
-|---------------------------------------------------------|
-|Tab  |  Q|  W|  E|  R|  T|  Y|  U|  I|  O|  P|  [|  ]|  \|
-|---------------------------------------------------------|
-|CapsLo|  A|  S|  D|  F|  G|  H|  J|  K|  L|  ;|  '|Return|
-|---------------------------------------------------------|
-|Shift   |  Z|  X|  C|  V|  B|  N|  M|  ,|  ,|  /|Shift   |
-`---------------------------------------------------------'
-     |Opt|Alt |         Space               |Alt |Opt|
-     `-----------------------------------------------'
-
-
-Notes
------
-
-EOF
diff --git a/m0110_usb/README.md b/m0110_usb/README.md
new file mode 100644
index 000000000..a948af91b
--- /dev/null
+++ b/m0110_usb/README.md
@@ -0,0 +1,141 @@
+M0110/M0110A to USB keyboard converter
+======================================
+This firmware converts the protocol of Apple Macintosh keyboard M0110/M0110A into USB.
+Target board of this project is [PJRC Teensy](http://www.pjrc.com/teensy/), though,
+you can use other board with USB AVR like `ATmega32U4` and `AT90USB`.
+
+![M0110](https://github.com/tmk/tmk_keyboard/raw/master/m0110_usb/doc/m0110.jpg)
+
+M0110A support was contributed by [skagon@github](https://github.com/skagon).
+
+
+
+Connection
+----------
+You need 4P4C plug and cable to connect Teensy or other AVR dev board into the keyboard.
+Teensy port `PF0` is assigned for `CLOCK` line and `PF1` for `DATA` by default,
+you can change pin configuration with editing *config.h*.
+
+You can find 4P4C plugs on telephone handset cable. Note that it is *crossover* connection
+while Macintosh keyboard cable is *straight*.
+
+[![Conection](http://i.imgur.com/vJoVOm.jpg)](http://i.imgur.com/vJoVO.jpg)
+
+In this pic:
+
+1. `GND`(Black)
+2. `CLOCK`(Red)
+3. `DATA`(Green)
+4. `+5V`(Yellow)
+
+Not that wire colors may vary in your cable.
+
+
+### Pinout
+- <http://pinouts.ru/Inputs/MacKeyboard_pinout.shtml>
+- <http://en.wikipedia.org/wiki/Modular_connector#4P4C>
+
+![Jack fig](http://www.kbdbabel.org/conn/kbd_connector_macplus.png)
+
+
+### Pull-up Registor
+You may need pull-up registors on signal lines(`CLOCK`, `DATA`) in particular
+when you have long or coiled cable. 1k-10k Ohm will be OK for this purpose.
+In some cases MCU can't read signal from keyboard correctly without pull-up resistors.
+
+
+
+Building Frimware
+-----------------
+To compile firmware you need AVR GCC. You can use [WinAVR](http://winavr.sourceforge.net/) on Windows.
+You can edit *Makefile* and *config.h* to change compile options and pin configuration.
+
+    $ git clone ... (or download source)
+    $ cd m0110_usb
+    $ make
+
+and program your Teensy with [PJRC Teensy loader](http://www.pjrc.com/teensy/loader.html).
+
+
+
+Keymap
+------
+You can change keymaps by editing *keymap.c*.
+
+### M0110
+#### *Default*
+    ,---------------------------------------------------------.
+    |  `|  1|  2|  3|  4|  5|  6|  7|  8|  9|  0|  -|  =|Backs|
+    |---------------------------------------------------------|
+    |Tab  |  Q|  W|  E|  R|  T|  Y|  U|  I|  O|  P|  [|  ]|  \|
+    |---------------------------------------------------------|
+    |Fn0   |  A|  S|  D|  F|  G|  H|  J|  K|  L|  ;|  '|Return|
+    |---------------------------------------------------------|
+    |Shift   |  Z|  X|  C|  V|  B|  N|  M|  ,|  ,|  /|Shift   |
+    `---------------------------------------------------------'
+         |Ctr|Alt |         Space               |Gui |Ctr|
+         `-----------------------------------------------'
+    You can register Esc by hitting(press&release) Fn0 quickly.
+
+#### *HHKB/WASD cursor Layer(Fn0)*
+    ,---------------------------------------------------------.
+    |Esc| F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|Delet|
+    |---------------------------------------------------------|
+    |Caps |Hom| Up|PgU|   |   |   |   |Psc|Slk|Pau|Up |Ins|  \|
+    |---------------------------------------------------------|
+    |Fn0   |Lef|Dow|Rig|   |   |   |   |Hom|PgU|Lef|Rig|Return|
+    |---------------------------------------------------------|
+    |Shift   |End|   |PgD|   |VoD|VoU|Mut|End|PgD|Dow|Shift   |
+    `---------------------------------------------------------'
+         |Ctr|Alt |         Space               |Gui |Ctr|
+         `-----------------------------------------------'
+
+### M0110A
+#### *Default*
+    ,---------------------------------------------------------. ,---------------.
+    |  `|  1|  2|  3|  4|  5|  6|  7|  8|  9|  0|  -|  =|Backs| |Gui|  =|  /|  *|
+    |---------------------------------------------------------| |---------------|
+    |Tab  |  Q|  W|  E|  R|  T|  Y|  U|  I|  O|  P|  [|  ]|   | |  7|  8|  9|  -|
+    |-----------------------------------------------------'   | |---------------|
+    |Fn0   |  A|  S|  D|  F|  G|  H|  J|  K|  L|  ;|  '|Return| |  4|  5|  6|  +|
+    |---------------------------------------------------------| |---------------|
+    |Shift   |  Z|  X|  C|  V|  B|  N|  M|  ,|  ,|  /|Shft|Up | |  1|  2|  3|   |
+    |---------------------------------------------------------| |-----------|Ent|
+    |Ctrl |Alt    |         Space             |  \|Lft|Rgt|Dn | |      0|  .|   |
+    `---------------------------------------------------------' `---------------'
+#### *HHKB/WASD cursor Layer(Fn0)*
+    ,---------------------------------------------------------. ,---------------.
+    |Esc| F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|Delet| |Nlk|  =|  /|  *|
+    |---------------------------------------------------------| |---------------|
+    |Caps |Hom| Up|PgU|   |   |   |   |Psc|Slk|Pau|Up |Ins|   | |  7|  8|  9|  -|
+    |-----------------------------------------------------'   | |---------------|
+    |Fn0   |Lef|Dow|Rig|   |   |   |   |Hom|PgU|Lef|Rig|Return| |  4|  5|  6|  +|
+    |---------------------------------------------------------| |---------------|
+    |Shift   |End|   |PgD|   |VoD|VoU|Mut|End|PgD|Dow|Shif|Up | |  1|  2|  3|   |
+    |---------------------------------------------------------| |-----------|Ent|
+    |Ctrl |Alt    |         Space             |  \|Lft|Rgt|Dn | |      0|  .|   |
+    `---------------------------------------------------------' `---------------'
+
+
+
+Debug
+-----
+You can use [PJRC HID listen](http://www.pjrc.com/teensy/hid_listen.html) to see debug output.
+
+The converter has some functions for debug, press `Alt+Gui+H` simultaneously to get help.
+These function is totally undocumented, tentative, inconsistent and buggy.
+
+
+
+Arrow Keys
+----------
+Dedicated arrow keys of the M0110A are transmitting the same scancodes as the keypad but also,
+its [=], [/], [*] and [+] keys (hereafter referred to as "calc" keys) are not assigned new
+scancodes but, instead, transmit a sequence of scancodes which emulates the [Shift] key press,
+followed by the same scancode sequence of the arrow keys!
+The problem with that approach is that, while in most cases it's easy to distinguish between
+a user-generated [Shift] key event (press or release) followed by an arrow or a calc key and
+a simulated [Shift] key event generated upon a calc key event, when the user is typing fairly
+fast, it is possible that the two events become indistinguishable, and produce undesired results
+-- nothing major, though, just one or two stray characters or cursor movements; it will NOT
+format your drives, kill your cat or make your wife run away with the pizza boy.
diff --git a/m0110_usb/config.h b/m0110_usb/config.h
index c12e0738d..de20d7c88 100644
--- a/m0110_usb/config.h
+++ b/m0110_usb/config.h
@@ -30,7 +30,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
 /* matrix size */
-#define MATRIX_ROWS 8
+#define MATRIX_ROWS 14
 #define MATRIX_COLS 8
 
 /* Locking Caps Lock support */
@@ -38,8 +38,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 /* key combination for command */
 #define IS_COMMAND() ( \
-    keyboard_report->mods == (MOD_BIT(KB_LSHIFT) | MOD_BIT(KB_LCTRL) | MOD_BIT(KB_LALT) | MOD_BIT(KB_LGUI)) || \
-    keyboard_report->mods == (MOD_BIT(KB_LSHIFT) | MOD_BIT(KB_RSHIFT)) \
+    keyboard_report->mods == (MOD_BIT(KB_LALT) | MOD_BIT(KB_LGUI)) \
 )
 
 
diff --git a/m0110_usb/keymap.c b/m0110_usb/keymap.c
index bbb699a9a..8c509a59b 100644
--- a/m0110_usb/keymap.c
+++ b/m0110_usb/keymap.c
@@ -14,10 +14,8 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+/* M0110A Support was contributed by skagon@github */
 
-/* 
- * Keymap for ADB keyboard
- */
 #include <stdint.h>
 #include <stdbool.h>
 #include <avr/pgmspace.h>
@@ -31,16 +29,12 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #define KEYCODE(layer, row, col) (pgm_read_byte(&keymaps[(layer)][(row)][(col)]))
 
-// Convert physical keyboard layout to matrix array.
-// This is a macro to define keymap easily in keyboard layout form.
-// TODO: layout for M0110A
-/* M0110 */
 #define KEYMAP( \
-    K32,K12,K13,K14,K15,K17,K16,K1A,K1C,K19,K1D,K1B,K18,K33, \
-    K30,K0C,K0D,K0E,K0F,K11,K10,K20,K22,K1F,K23,K21,K1E,K2A, \
-    K39,K00,K01,K02,K03,K05,K04,K26,K28,K25,K29,K27,    K24, \
-    K38,K06,K07,K08,K09,K0B,K2D,K2E,K2B,K2F,K2C,             \
-        K3A,K37,        K31,                K34              \
+    K32,K12,K13,K14,K15,K17,K16,K1A,K1C,K19,K1D,K1B,K18,K33,  K47,K68,K6D,K62, \
+    K30,K0C,K0D,K0E,K0F,K11,K10,K20,K22,K1F,K23,K21,K1E,      K59,K5B,K5C,K4E, \
+    K39,K00,K01,K02,K03,K05,K04,K26,K28,K25,K29,K27,    K24,  K56,K57,K58,K66, \
+    K38,K06,K07,K08,K09,K0B,K2D,K2E,K2B,K2F,K2C,        K4D,  K53,K54,K55,K4C, \
+    K3A,K37,            K31,            K34,K2A,K46,K42,K48,  K52,    K41      \
 ) { \
     { KB_##K00, KB_##K01, KB_##K02, KB_##K03, KB_##K04, KB_##K05, KB_##K06, KB_##K07 }, \
     { KB_##K08, KB_##K09, KB_NO,    KB_##K0B, KB_##K0C, KB_##K0D, KB_##K0E, KB_##K0F }, \
@@ -49,7 +43,13 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
     { KB_##K20, KB_##K21, KB_##K22, KB_##K23, KB_##K24, KB_##K25, KB_##K26, KB_##K27 }, \
     { KB_##K28, KB_##K29, KB_##K2A, KB_##K2B, KB_##K2C, KB_##K2D, KB_##K2E, KB_##K2F }, \
     { KB_##K30, KB_##K31, KB_##K32, KB_##K33, KB_##K34, KB_NO,    KB_NO,    KB_##K37 }, \
-    { KB_##K38, KB_##K39, KB_##K3A, KB_NO,    KB_NO,    KB_NO,    KB_NO,    KB_NO    }  \
+    { KB_##K38, KB_##K39, KB_##K3A, KB_NO,    KB_NO,    KB_NO,    KB_NO,    KB_NO    }, \
+    { KB_NO,    KB_##K41, KB_##K42, KB_NO,    KB_NO,    KB_NO,    KB_##K46, KB_##K47 }, \
+    { KB_##K48, KB_NO,    KB_NO,    KB_NO,    KB_##K4C, KB_##K4D, KB_##K4E, KB_NO    }, \
+    { KB_NO,    KB_NO,    KB_##K52, KB_##K53, KB_##K54, KB_##K55, KB_##K56, KB_##K57 }, \
+    { KB_##K58, KB_##K59, KB_NO,    KB_##K5B, KB_##K5C, KB_NO,    KB_NO,    KB_NO    }, \
+    { KB_NO,    KB_NO,    KB_##K62, KB_NO,    KB_NO,    KB_NO,    KB_##K66, KB_NO    }, \
+    { KB_##K68, KB_NO,    KB_NO,    KB_NO,    KB_NO,    KB_##K6D, KB_NO,    KB_NO    }, \
 }
 
 
@@ -68,9 +68,14 @@ static const uint8_t PROGMEM fn_layer[] = {
 // Assign Fn key(0-7) to a keycode sent when release Fn key without use of the layer.
 // See layer.c for details.
 static const uint8_t PROGMEM fn_keycode[] = {
-    KB_SCOLON,      // Fn0
-    KB_SLASH,       // Fn1
+    KB_ESC,         // Fn0
+#ifdef HASU
+    KB_SCOLON,      // Fn1
+    KB_SLASH,       // Fn2
+#else
+    KB_NO,          // Fn1
     KB_NO,          // Fn2
+#endif
     KB_NO,          // Fn3
     KB_NO,          // Fn4
     KB_NO,          // Fn5
@@ -79,52 +84,97 @@ static const uint8_t PROGMEM fn_keycode[] = {
 };
 
 static const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
-    // LShift and RShift are logically same one button.
-    // LOption and ROption are logically same one button.
-    /* Default Layer: plain keymap
-     * ,---------------------------------------------------------.
-     * |  `|  1|  2|  3|  4|  5|  6|  7|  8|  9|  0|  -|  =|Bacpa|
-     * |---------------------------------------------------------|
-     * |Tab  |  Q|  W|  E|  R|  T|  Y|  U|  I|  O|  P|  [|  ]|  \|
-     * |---------------------------------------------------------|
-     * |Contro|  A|  S|  D|  F|  G|  H|  J|  K|  L|Fn0|  '|Return|
-     * |---------------------------------------------------------|
-     * |Shift   |  Z|  X|  C|  V|  B|  N|  M|  ,|  ,|Fn1|   Shift|
-     * `---------------------------------------------------------'
-     *      |Fn2|Alt |         Space               |Gui |Fn2|
-     *      `-----------------------------------------------'
+    /* 
+     * The keymap works with both M0110 and M0110A keyboards. As you can see, the M0110A is a superset
+     * of the M0110 keyboard, with only one exception: the right Alt key(Enter in M0110) does not exist
+     * on the M0110A, but since it generates a unique scan code which is not used for some other key in
+     * the M0110A, they are totally interchangeable.  In fact, the M0110A is functionally (almost)
+     * identical to the combination of the M0110 along with the M0120 keypad. The only difference
+     * (which is causing some problems as you will read below) is that the M0110+M0120 don't have
+     * dedicated arrow keys, while the M0110A does. However, the M0120 did have arrow keys, which
+     * doubled as the [comma], [/], [*] and [+] keys, when used with the [Shift] key. The M0110A has
+     * substituted the [comma] key with the [=] key, however its scancode is the same.
+     *
+     * Default:
+     * ,---------------------------------------------------------. ,---------------.
+     * |  `|  1|  2|  3|  4|  5|  6|  7|  8|  9|  0|  -|  =|Backs| |Gui|  =|  /|  *|
+     * |---------------------------------------------------------| |---------------|
+     * |Tab  |  Q|  W|  E|  R|  T|  Y|  U|  I|  O|  P|  [|  ]|   | |  7|  8|  9|  -|
+     * |-----------------------------------------------------'   | |---------------|
+     * |Fn0   |  A|  S|  D|  F|  G|  H|  J|  K|  L|  ;|  '|Return| |  4|  5|  6|  +|
+     * |---------------------------------------------------------| |---------------|
+     * |Shift   |  Z|  X|  C|  V|  B|  N|  M|  ,|  ,|  /|Shft|Up | |  1|  2|  3|   |
+     * |---------------------------------------------------------| |-----------|Ent|
+     * |Ctrl |Alt    |         Space         |Gui|  \|Lft|Rgt|Dn | |      0|  .|   |
+     * `---------------------------------------------------------' `---------------'
+     * You can register Esc by hitting(press&release) Fn0 quickly.
+     *
+     * HHKB/WASD cursor Layer(Fn0):
+     * ,---------------------------------------------------------. ,---------------.
+     * |Esc| F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|Delet| |Nlk|  =|  /|  *|
+     * |---------------------------------------------------------| |---------------|
+     * |Caps |Hom| Up|PgU|   |   |   |   |Psc|Slk|Pau|Up |Ins|   | |  7|  8|  9|  -|
+     * |-----------------------------------------------------'   | |---------------|
+     * |Fn0   |Lef|Dow|Rig|   |   |   |   |Hom|PgU|Lef|Rig|Return| |  4|  5|  6|  +|
+     * |---------------------------------------------------------| |---------------|
+     * |Shift   |End|   |PgD|   |VoD|VoU|Mut|End|PgD|Dow|Shif|Up | |  1|  2|  3|   |
+     * |---------------------------------------------------------| |-----------|Ent|
+     * |Ctrl |Alt    |         Space        |Gui |  \|Lft|Rgt|Dn | |      0|  .|   |
+     * `---------------------------------------------------------' `---------------'
+     *
+     * NOTE: Key between Space and \ in above diagram is M0110 Enter(assigned to Gui).
+     * NOTE: LShift and RShift are logically same key. (M0110, M0110A)
+     * NOTE: LOption and ROption are logically same key. (M0110)
      */
+#ifdef HASU
     KEYMAP(
-    GRV, 1,   2,   3,   4,   5,   6,   7,   8,   9,   0,   MINS,EQL, BSPC,
-    TAB, Q,   W,   E,   R,   T,   Y,   U,   I,   O,   P,   LBRC,RBRC,BSLS,
-    LCTL,A,   S,   D,   F,   G,   H,   J,   K,   L,   FN0, QUOT,     ENT,
-    LSFT,Z,   X,   C,   V,   B,   N,   M,   COMM,DOT, FN1, 
-         FN2, LALT,          SPC,                     LGUI
+    ESC, 1,   2,   3,   4,   5,   6,   7,   8,   9,   0,   MINS,EQL, BSPC,    ESC, PEQL,PSLS,PAST,
+    TAB, Q,   W,   E,   R,   T,   Y,   U,   I,   O,   P,   LBRC,RBRC,         P7,  P8,  P9,  PMNS,
+    LCTL,A,   S,   D,   F,   G,   H,   J,   K,   L,   FN1, QUOT,     ENT,     P4,  P5,  P6,  PPLS,
+    LSFT,Z,   X,   C,   V,   B,   N,   M,   COMM,DOT, FN2,           UP,      P1,  P2,  P3,  PENT,
+    FN0, LALT,               SPC,                LGUI,BSLS,LEFT,DOWN,RGHT,    P0,       PDOT
+    ),
+    // HHKB & WASD
+    KEYMAP(
+    GRV, F1,  F2,  F3,  F4,  F5,  F6,  F7,  F8,  F9,  F10, F11, F12, DEL,     NLCK,PEQL,PSLS,PAST,
+    CAPS,HOME,UP,  PGUP,NO,  NO,  NO,  NO,  PSCR,SLCK,BRK, UP,  INS,          P7,  P8,  P9,  PMNS,
+    LCTL,LEFT,DOWN,RGHT,NO,  NO,  NO,  NO,  HOME,PGUP,LEFT,RGHT,     ENT,     P4,  P5,  P6,  PPLS,
+    LSFT,END, NO,  PGDN,NO,  VOLD,VOLU,MUTE,END, PGDN,DOWN,          UP,      P1,  P2,  P3,  PENT,
+    FN0, LALT,               SPC,                LGUI,BSLS,LEFT,DOWN,RGHT,    P0,       PDOT
     ),
     // vi mousekeys
     KEYMAP(
-    ESC, F1,  F2,  F3,  F4,  F5,  F6,  F7,  F8,  F9,  F10, F11, F12, DEL,
-    CAPS,NO,  NO,  NO,  NO,  NO,  WH_L,WH_D,WH_U,WH_R,NO,  NO,  NO,  NO,
-    LCTL,VOLD,VOLU,MUTE,NO,  NO,  MS_L,MS_D,MS_U,MS_R,FN0, NO,       ENT,
-    LSFT,NO,  NO,  NO,  NO,  BTN3,BTN2,BTN1,NO,  NO,  NO,  
-         NO,  LALT,          BTN1,                    LGUI
+    GRV, F1,  F2,  F3,  F4,  F5,  F6,  F7,  F8,  F9,  F10, F11, F12, DEL,     NLCK,PEQL,PSLS,PAST,
+    CAPS,NO,  NO,  NO,  NO,  NO,  WH_L,WH_D,WH_U,WH_R,NO,  NO,  NO,           P7,  P8,  P9,  PMNS,
+    NO,  VOLD,VOLU,MUTE,NO,  NO,  MS_L,MS_D,MS_U,MS_R,FN1, NO,       ENT,     P4,  P5,  P6,  PPLS,
+    LSFT,NO,  NO,  NO,  NO,  BTN3,BTN2,BTN1,NO,  NO,  NO,            UP,      P1,  P2,  P3,  PENT,
+    LCTL,LALT,               BTN1,               LGUI,BSLS,LEFT,DOWN,RGHT,    P0,       PDOT
     ),
     // vi cusorkeys
     KEYMAP(
-    ESC, F1,  F2,  F3,  F4,  F5,  F6,  F7,  F8,  F9,  F10, F11, F12, DEL,
-    CAPS,NO,  NO,  NO,  NO,  NO,  HOME,PGDN,PGUP,END, NO,  NO,  NO,  NO,
-    LCTL,NO,  NO,  NO,  NO,  NO,  LEFT,DOWN,UP,  RGHT,NO,  NO,       ENT,
-    LSFT,NO,  NO,  NO,  NO,  NO,  HOME,PGDN,PGUP,END, FN1, 
-         NO,  LALT,          SPC,                     LGUI
+    GRV, F1,  F2,  F3,  F4,  F5,  F6,  F7,  F8,  F9,  F10, F11, F12, DEL,     NLCK,PEQL,PSLS,PAST,
+    CAPS,NO,  NO,  NO,  NO,  NO,  HOME,PGDN,PGUP,END, NO,  NO,  NO,           P7,  P8,  P9,  PMNS,
+    NO,  NO,  NO,  NO,  NO,  NO,  LEFT,DOWN,UP,  RGHT,NO,  NO,       ENT,     P4,  P5,  P6,  PPLS,
+    LSFT,NO,  NO,  NO,  NO,  NO,  HOME,PGDN,PGUP,END, FN2,           UP,      P1,  P2,  P3,  PENT,
+    LCTL,LALT,               SPC,                LGUI,BSLS,LEFT,DOWN,RGHT,    P0,       PDOT
+    ),
+#else
+    KEYMAP(
+    GRV, 1,   2,   3,   4,   5,   6,   7,   8,   9,   0,   MINS,EQL, BSPC,    LGUI,PEQL,PSLS,PAST,
+    TAB, Q,   W,   E,   R,   T,   Y,   U,   I,   O,   P,   LBRC,RBRC,         P7,  P8,  P9,  PMNS,
+    FN0, A,   S,   D,   F,   G,   H,   J,   K,   L,   SCLN,QUOT,     ENT,     P4,  P5,  P6,  PPLS,
+    LSFT,Z,   X,   C,   V,   B,   N,   M,   COMM,DOT, SLSH,          UP,      P1,  P2,  P3,  PENT,
+    LCTL,LALT,               SPC,                LGUI,BSLS,LEFT,DOWN,RGHT,    P0,       PDOT
     ),
     // HHKB & WASD
     KEYMAP(
-    ESC, F1,  F2,  F3,  F4,  F5,  F6,  F7,  F8,  F9,  F10, F11, F12, DEL,
-    CAPS,HOME,UP,  PGUP,NO,  NO,  NO,  NO,  PSCR,SLCK,BRK, UP,  NO,  NO,
-    LCTL,LEFT,DOWN,RGHT,NO,  NO,  NO,  NO,  HOME,PGUP,LEFT,RGHT,     ENT,
-    LSFT,END, NO,  PGDN,NO,  VOLD,VOLU,MUTE,END, PGDN,DOWN,
-         FN2, LALT,          SPC,                     LGUI
+    ESC, F1,  F2,  F3,  F4,  F5,  F6,  F7,  F8,  F9,  F10, F11, F12, DEL,     NLCK,PEQL,PSLS,PAST,
+    CAPS,HOME,UP,  PGUP,NO,  NO,  NO,  NO,  PSCR,SLCK,BRK, UP,  INS,          P7,  P8,  P9,  PMNS,
+    FN0, LEFT,DOWN,RGHT,NO,  NO,  NO,  NO,  HOME,PGUP,LEFT,RGHT,     ENT,     P4,  P5,  P6,  PPLS,
+    LSFT,END, NO,  PGDN,NO,  VOLD,VOLU,MUTE,END, PGDN,DOWN,          UP,      P1,  P2,  P3,  PENT,
+    LCTL,LALT,               SPC,                LGUI,BSLS,LEFT,DOWN,RGHT,    P0,       PDOT
     ),
+#endif
 };
 
 
diff --git a/m0110_usb/matrix.c b/m0110_usb/matrix.c
index f045920cc..11303ee0f 100644
--- a/m0110_usb/matrix.c
+++ b/m0110_usb/matrix.c
@@ -93,6 +93,9 @@ uint8_t matrix_scan(void)
 #endif
     if (key == M0110_NULL) {
         return 0;
+    } else if (key == M0110_ERROR) {
+        // TODO: error recovery or reinit
+        return 0;
     } else {
 #ifdef MATRIX_HAS_LOCKING_CAPS    
         if (host_keyboard_leds() & (1<<USB_LED_CAPS_LOCK)) {
diff --git a/rules.mk b/rules.mk
index 3d32adc5f..d575726c7 100644
--- a/rules.mk
+++ b/rules.mk
@@ -230,6 +230,8 @@ LDFLAGS += $(EXTMEMOPTS)
 LDFLAGS += $(patsubst %,-L%,$(EXTRALIBDIRS))
 LDFLAGS += $(PRINTF_LIB) $(SCANF_LIB) $(MATH_LIB)
 #LDFLAGS += -T linker_script.x
+# You can give EXTRALDFLAGS at 'make' command line.
+LDFLAGS += $(EXTRALDFLAGS)
 
 
 
@@ -315,9 +317,10 @@ GENDEPFLAGS = -MMD -MP -MF .dep/$(@F).d
 
 # Combine all necessary flags and optional flags.
 # Add target processor to flags.
-ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS) $(GENDEPFLAGS)
-ALL_CPPFLAGS = -mmcu=$(MCU) -I. -x c++ $(CPPFLAGS) $(GENDEPFLAGS)
-ALL_ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp $(ASFLAGS)
+# You can give EXTRAFLAGS at 'make' command line.
+ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS) $(GENDEPFLAGS) $(EXTRAFLAGS)
+ALL_CPPFLAGS = -mmcu=$(MCU) -I. -x c++ $(CPPFLAGS) $(GENDEPFLAGS) $(EXTRAFLAGS)
+ALL_ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp $(ASFLAGS) $(EXTRAFLAGS)