revise Fn key processing.

7 files changed, 293 insertions, 160 deletions

diff --git a/hhkb/keymap.c b/hhkb/keymap.c
index cad601d46..cce8fb0a0 100644
--- a/hhkb/keymap.c
+++ b/hhkb/keymap.c
@@ -43,7 +43,7 @@ static const uint8_t PROGMEM fn_keycode[] = {
     KB_NO,          // FN_1 layer 1
     KB_QUOTE,       // FN_2 layer 2
     KB_SCOLON,      // FN_3 layer 3
-    KB_SPACE,       // FN_4 layer 4 [NOT USED]
+    KB_SPACE,       // FN_4 layer 4
     KB_NO,          // FN_5 [NOT USED]
     KB_NO,          // FN_6 [NOT USED]
     KB_NO           // FN_7 layer 1
@@ -60,14 +60,14 @@ static const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
      * |-----------------------------------------------------------|
      * |Shift   |  Z|  X|  C|  V|  B|  N|  M|  ,|  .|  /|Shift |Fn1|
      * `-----------------------------------------------------------'
-     *       |Gui|Alt  |Space                  |Alt  |Fn7|
+     *       |Gui|Alt  |Fn4                    |Alt  |Fn7|
      *       `-------------------------------------------'
      */
     KEYMAP(KB_ESC, KB_1,   KB_2,   KB_3,   KB_4,   KB_5,   KB_6,   KB_7,   KB_8,   KB_9,   KB_0,   KB_MINS,KB_EQL, KB_BSLS,KB_GRV, \
            KB_TAB, KB_Q,   KB_W,   KB_E,   KB_R,   KB_T,   KB_Y,   KB_U,   KB_I,   KB_O,   KB_P,   KB_LBRC,KB_RBRC,KB_BSPC, \
            KB_LCTL,KB_A,   KB_S,   KB_D,   KB_F,   KB_G,   KB_H,   KB_J,   KB_K,   KB_L,   FN_3,   FN_2,   KB_ENT, \
            KB_LSFT,KB_Z,   KB_X,   KB_C,   KB_V,   KB_B,   KB_N,   KB_M,   KB_COMM,KB_DOT, KB_SLSH,KB_RSFT,FN_1, \
-           KB_LGUI,KB_LALT,KB_SPC, KB_RALT,FN_7),
+           KB_LGUI,KB_LALT,FN_4,   KB_RALT,FN_7),
 
     /* Layer 1: HHKB mode (HHKB Fn)
      * ,-----------------------------------------------------------.
@@ -111,7 +111,7 @@ static const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
      * ,-----------------------------------------------------------.
      * |Esc| F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|Ins|Del|
      * |-----------------------------------------------------------|
-     * |Tab  |MwL|MwU|McU|MwD|MwL|MwR|MwD|MwU|MwR|   |   |   |Backs|
+     * |Tab  |MwL|MwU|McU|MwD|MwR|MwL|MwD|MwU|MwR|   |   |   |Backs|
      * |-----------------------------------------------------------|
      * |Contro|   |McL|McD|McR|   |McL|McD|McU|McR|xxx|   |Return  |
      * |-----------------------------------------------------------|
@@ -165,5 +165,5 @@ uint8_t keymap_fn_keycode(uint8_t fn_bits)
 
 bool keymap_is_special_mode(uint8_t fn_bits)
 {
-    return (keyboard_modifier_keys == (BIT_LCTRL | BIT_LSHIFT | BIT_LALT | BIT_LGUI));
+    return (usb_keyboard_mods == (BIT_LCTRL | BIT_LSHIFT | BIT_LALT | BIT_LGUI));
 }
diff --git a/key_process.c b/key_process.c
index af0b5897a..dc75c2c61 100644
--- a/key_process.c
+++ b/key_process.c
@@ -57,7 +57,7 @@ void proc_matrix(void) {
         return;
     }
 
-    usb_keyboard_clear();
+    usb_keyboard_clear_report();
     for (int row = 0; row < matrix_rows(); row++) {
         for (int col = 0; col < matrix_cols(); col++) {
             if (!matrix_is_on(row, col)) continue;
@@ -66,7 +66,7 @@ void proc_matrix(void) {
             if (code == KB_NO) {
                 // do nothing
             } else if (IS_MOD(code)) {
-                keyboard_modifier_keys |= MOD_BIT(code);
+                usb_keyboard_mods |= MOD_BIT(code);
             } else if (IS_MOUSE(code)) {
                 // mouse
                 if (code == MS_UP)
@@ -91,7 +91,7 @@ void proc_matrix(void) {
             } else {
                 // normal keys
                 if (key_index < 6)
-                    keyboard_keys[key_index] = code;
+                    usb_keyboard_keys[key_index] = code;
                 key_index++;
             }
         }
@@ -100,7 +100,7 @@ void proc_matrix(void) {
 
     // when 4 left modifier keys down
     if (keymap_is_special_mode(fn_bits)) {
-        switch (keyboard_keys[0]) {
+        switch (usb_keyboard_keys[0]) {
             case KB_H: // help
                 print_enable = true;
                 print("b: jump to bootloader\n");
@@ -115,7 +115,7 @@ void proc_matrix(void) {
                 print_enable = false;
                 break;
             case KB_B: // bootloader
-                usb_keyboard_clear();
+                usb_keyboard_clear_report();
                 usb_keyboard_send();
                 print_enable = true;
                 print("jump to bootloader...\n");
@@ -123,7 +123,7 @@ void proc_matrix(void) {
                 jump_bootloader(); // not return
                 break;
             case KB_D: // debug all toggle
-                usb_keyboard_clear();
+                usb_keyboard_clear_report();
                 usb_keyboard_send();
                 debug_enable = !debug_enable;
                 if (debug_enable) {
@@ -142,7 +142,7 @@ void proc_matrix(void) {
                 _delay_ms(1000);
                 break;
             case KB_X: // debug matrix toggle
-                usb_keyboard_clear();
+                usb_keyboard_clear_report();
                 usb_keyboard_send();
                 debug_matrix = !debug_matrix;
                 if (debug_matrix)
@@ -152,7 +152,7 @@ void proc_matrix(void) {
                 _delay_ms(1000);
                 break;
             case KB_K: // debug keyboard toggle
-                usb_keyboard_clear();
+                usb_keyboard_clear_report();
                 usb_keyboard_send();
                 debug_keyboard = !debug_keyboard;
                 if (debug_keyboard)
@@ -162,7 +162,7 @@ void proc_matrix(void) {
                 _delay_ms(1000);
                 break;
             case KB_M: // debug mouse toggle
-                usb_keyboard_clear();
+                usb_keyboard_clear_report();
                 usb_keyboard_send();
                 debug_mouse = !debug_mouse;
                 if (debug_mouse)
@@ -172,21 +172,21 @@ void proc_matrix(void) {
                 _delay_ms(1000);
                 break;
             case KB_V: // print version & information
-                usb_keyboard_clear();
+                usb_keyboard_clear_report();
                 usb_keyboard_send();
                 print_enable = true;
                 print(STR(DESCRIPTION) "\n");
                 _delay_ms(1000);
                 break;
             case KB_T: // print timer
-                usb_keyboard_clear();
+                usb_keyboard_clear_report();
                 usb_keyboard_send();
                 print_enable = true;
                 print("timer: "); phex16(timer_count); print("\n");
                 _delay_ms(500);
                 break;
             case KB_P: // print toggle
-                usb_keyboard_clear();
+                usb_keyboard_clear_report();
                 usb_keyboard_send();
                 if (print_enable) {
                     print("print disabled.\n");
@@ -224,7 +224,6 @@ void proc_matrix(void) {
             //Rollover
         }
         usb_keyboard_send();
-        usb_keyboard_print();
 #ifdef DEBUG_LED
         // LED flash for debug
         DEBUG_LED_CONFIG;
diff --git a/layer.c b/layer.c
index 5b9b591fe..9251e042e 100644
--- a/layer.c
+++ b/layer.c
@@ -5,26 +5,51 @@
 #include "layer.h"
 
 /*
- * LAYER_ENTER_DELAY: prevent from moving new layer
- *                     press                release
- * Fn key sate     ____|~~~~~~~~~~~~~~~~~~~|_______________
- * 
- * enter_delay         |======|
- *                              new layer
- * Layer sw        ___________|~~~~~~~~~~~~|_______________
- */ 
+ * Parameters:
+ *     enter_delay         |=======|
+ *     send_fn_term        |================|
+ *
+ * Fn key processing cases:
+ * 1. release Fn after send_fn_term.
+ *     Layer sw         ___________|~~~~~~~~~~~|___
+ *     Fn press         ___|~~~~~~~~~~~~~~~~~~~|___
+ *     Fn send          ___________________________
+ *
+ * 2. release Fn in send_fn_term.(not layer used)
+ *     Layer sw         ___________|~~~~~~|________
+ *     Fn press         ___|~~~~~~~~~~~~~~|________
+ *     Fn key send      __________________|~|______
+ *     other key press  ___________________________
+ *     other key send   ___________________________
+ *
+ * 3. release Fn in send_fn_term.(layer used)
+ *     Layer sw         ___________|~~~~~~|________
+ *     Fn press         ___|~~~~~~~~~~~~~~|________
+ *     Fn key send      ___________________________
+ *     Fn send          ___________________________
+ *     other key press  _____________|~~|__________
+ *     other key send   _____________|~~|__________
+ *
+ * 4. press other key in ENTER_DELAY.
+ *     Layer sw         ___________________________
+ *     Fn key press     ___|~~~~~~~~~|_____________
+ *     Fn key send      ______|~~~~~~|_____________
+ *     other key press  ______|~~~|________________
+ *     other key send   _______|~~|________________
+ *
+ * 5. press Fn while press other key.
+ *     Layer sw         ___________________________
+ *     Fn key press     ___|~~~~~~~~~|_____________
+ *     Fn key send      ___|~~~~~~~~~|_____________
+ *     other key press  ~~~~~~~|___________________
+ *     other key send   ~~~~~~~|___________________
+ */
+
+// LAYER_ENTER_DELAY: prevent from moving new layer
 #define LAYER_ENTER_DELAY 10
 
-/*
- * LAYER_SEND_FN_TERM: send keycode if release key in this term
- *                     press          release(send)
- * Fn key state    ____|~~~~~~~~~~~~~|_______________
- *                     press         |       release(not send)
- * Fn key state    ____|~~~~~~~~~~~~~|~~~~~~|__________
- *                                   |      |
- * send_fn_term        |=============o==|   x
- */
-#define LAYER_SEND_FN_TERM 30
+// LAYER_SEND_FN_TERM: send keycode if release key in this term
+#define LAYER_SEND_FN_TERM 40
 
 
 static uint8_t current_layer = 0;
@@ -35,58 +60,86 @@ uint8_t layer_get_keycode(uint8_t row, uint8_t col)
 {
     uint8_t code = keymap_get_keycode(current_layer, row, col);
     // normal key or mouse key
-    if ((IS_KEY(code) || IS_MOUSE(code)))
+    if ((IS_KEY(code) || IS_MOUSE(code))) {
         layer_used = true;
+    }
     return code;
 }
 
 void layer_switching(uint8_t fn_bits)
 {
     // layer switching
+    static uint8_t new_layer = 0;
     static uint8_t last_bits = 0;
-    static uint8_t last_mod = 0;
+    static uint8_t last_mods = 0;
     static uint16_t last_timer = 0; 
 
-    //uint16_t now_timer;
-
-    if (fn_bits == last_bits) {
-        // switch layer when specific time elapsed
-        if (current_layer != keymap_fn_layer(fn_bits) &&
-                timer_elapsed(last_timer) > LAYER_ENTER_DELAY) {
-            current_layer = keymap_fn_layer(fn_bits);
-            debug("time_elapsed: "); debug_hex16(timer_elapsed(last_timer)); debug("\n"); 
-            debug("switch layer: "); debug_hex(current_layer); debug("\n");
+    if (fn_bits == last_bits) { // Fn key is not changed
+        if (current_layer != new_layer) {
+            // not switch layer yet
+            if (timer_elapsed(last_timer) > LAYER_ENTER_DELAY) {
+                debug("Fn case: 1,2,3(switch layer)\n");
+                // case: 1,2,3
+                // switch layer after LAYER_ENTER_DELAY elapse
+                current_layer = new_layer;
+                debug("timer_elapsed: "); debug_hex16(timer_elapsed(last_timer)); debug("\n"); 
+                debug("switch layer: "); debug_hex(current_layer); debug("\n");
+            } else if (usb_keyboard_has_key()) {
+                debug("Fn case: 4(send Fn first, then add Fn to report)\n");
+                // case: 4
+                // send only Fn key first
+                usb_keyboard_swap_report();
+                usb_keyboard_clear_report();
+                usb_keyboard_add_code(keymap_fn_keycode(last_bits));
+                usb_keyboard_set_mods(last_mods);
+                usb_keyboard_send();
+                usb_keyboard_swap_report();
+                // add Fn key to send with other keys
+                usb_keyboard_add_code(keymap_fn_keycode(last_bits));
+                // cancel layer switching 
+                new_layer = 0;
+           }
+        } else {
+            if (fn_bits && new_layer == 0) {
+                // case: 4,5
+                // send Fn key
+                usb_keyboard_add_code(keymap_fn_keycode(last_bits));
+            }
         }
-    } else if (fn_bits == 0) {
-        // send key when Fn key is released without using the layer and within specific time
-        if ((!layer_used || current_layer != keymap_fn_layer(last_bits)) &&
-                timer_elapsed(last_timer) < LAYER_SEND_FN_TERM) {
-            uint8_t code = keymap_fn_keycode(last_bits);
-            if (code != KB_NO) {
-                if (IS_MOD(code)) {
-                    keyboard_modifier_keys = last_mod | MOD_BIT(code);
-                } else {
-                    keyboard_keys[0] = code;
-                    keyboard_modifier_keys = last_mod;
-                }
+    } else { // Fn key is changed
+        if (fn_bits == 0) { // Fn key is released(falling edge)
+            if (!layer_used && timer_elapsed(last_timer) < LAYER_SEND_FN_TERM) {
+                debug("Fn case: 2(send Fn)\n");
+                // send Fn key (case: 2[no layer used],3)
+                usb_keyboard_swap_report();
+                usb_keyboard_clear_report();
+                usb_keyboard_add_code(keymap_fn_keycode(last_bits));
+                usb_keyboard_set_mods(last_mods);
                 usb_keyboard_send();
-                usb_keyboard_print();
-                usb_keyboard_clear();
+                usb_keyboard_swap_report();
+            }
+            debug("Fn case: 1,2,3,4,5(return to default layer)\n");
+            // return to default layer(case: 1,2,3,4,5)
+            new_layer = 0;
+            current_layer = 0;
+        } else { // Fn Key is pressed(rising edge)
+            if (!usb_keyboard_has_key()) {
+                debug("Fn case: 1,2,3,4(ready for switching layer)\n");
+                // ready for switching layer(case: 1,2,3,4)
+                new_layer = keymap_fn_layer(fn_bits);
+            } else {
+                debug("Fn case: 5(add Fn to report)\n");
+                // add Fn key to send with other keys(case: 5)
+                usb_keyboard_add_code(keymap_fn_keycode(fn_bits));
             }
         }
-        last_bits = 0;
-        last_mod = 0;
         layer_used = false;
-        current_layer = 0; // default layer
-    } else if ((fn_bits & (fn_bits - 1)) == 0) {
-        // switch layer when just one Fn Key is pressed
-        if (!usb_keyboard_has_key()) {
-            last_bits = fn_bits;
-            last_mod = keyboard_modifier_keys;
-            last_timer = timer_read();
-            debug("last_bits: "); debug_bin(last_bits); debug("\n");
-            debug("last_mod: "); debug_hex(last_mod); debug("\n");
-            debug("last_timer: "); debug_hex16(last_timer); debug("\n");
-        }
+        last_bits = fn_bits;
+        last_mods = usb_keyboard_mods;
+        last_timer = timer_read();
+        debug("new_layer: "); debug_hex(new_layer); debug("\n");
+        debug("last_bits: "); debug_bin(last_bits); debug("\n");
+        debug("last_mods: "); debug_hex(last_mods); debug("\n");
+        debug("last_timer: "); debug_hex16(last_timer); debug("\n");
     }
 }
diff --git a/macway/keymap.c b/macway/keymap.c
index 00927a665..e78d6b7d1 100644
--- a/macway/keymap.c
+++ b/macway/keymap.c
@@ -42,7 +42,7 @@ static const uint8_t PROGMEM fn_keycode[] = {
     KB_NO,          // FN_1 layer 1
     KB_QUOTE,       // FN_2 layer 2
     KB_SCOLON,      // FN_3 layer 3
-    KB_SPACE,       // FN_4 layer 4 [NOT USED]
+    KB_SPACE,       // FN_4 layer 4
     KB_NO,          // FN_5 [NOT USED]
     KB_NO,          // FN_6 layer 2
     KB_NO           // FN_7 layer 3
@@ -59,14 +59,14 @@ static const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
      * |-----------------------------------------------------------|
      * |Shift   |  Z|  X|  C|  V|  B|  N|  M|  ,|  .|  /|Shift |Fn1|
      * |-----------------------------------------------------------|
-     * |Fn7|Gui |Alt  |Space                 |Fn6  |\  |`  |   |   |
+     * |Fn7|Gui |Alt  |Fn4                   |Fn6  |\  |`  |   |   |
      * `-----------------------------------------------------------'
      */
     KEYMAP(KB_ESC, KB_1,   KB_2,   KB_3,   KB_4,   KB_5,   KB_6,   KB_7,   KB_8,   KB_9,   KB_0,   KB_MINS,KB_EQL, KB_BSPC, \
            KB_TAB, KB_Q,   KB_W,   KB_E,   KB_R,   KB_T,   KB_Y,   KB_U,   KB_I,   KB_O,   KB_P,   KB_LBRC,KB_RBRC, \
            KB_LCTL,KB_A,   KB_S,   KB_D,   KB_F,   KB_G,   KB_H,   KB_J,   KB_K,   KB_L,   FN_3,   FN_2,   KB_ENT, \
            KB_LSFT,KB_Z,   KB_X,   KB_C,   KB_V,   KB_B,   KB_N,   KB_M,   KB_COMM,KB_DOT, KB_SLSH,KB_RSFT,FN_1, \
-           FN_7,   KB_LGUI,KB_LALT,KB_SPC, FN_6,   KB_BSLS,KB_GRV, KB_NO,  KB_NO),
+           FN_7,   KB_LGUI,KB_LALT,FN_4,   FN_6,   KB_BSLS,KB_GRV, KB_NO,  KB_NO),
 
 
     /* Layer 1: HHKB mode (HHKB Fn)
@@ -113,20 +113,20 @@ static const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
      * ,-------------------------------------------------------- --.
      * |Esc| F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|Delete |
      * |-----------------------------------------------------------|
-     * |Tab  |MwL|MwU|McU|MwD|MwR|MwL|MwD|MwU|MwR|   |   |   |     |
+     * |Tab  |MwL|MwD|McU|MwU|MwR|MwL|MwD|MwU|MwR|   |   |   |     |
      * |-----------------------------------------------------'     |
-     * |Contro|Mb1|Mb2|Mb3|   |   |McL|McD|McU|McR|xxx|   |Return  |
+     * |Contro|   |McL|McD|McR|   |McL|McD|McU|McR|xxx|   |Return  |
      * |-----------------------------------------------------------|
-     * |Shift   |   |   |   |   |   |MwL|MwD|MwU|MwR|   |Shift |   |
+     * |Shift   |   |   |Mb1|Mb2|Mb3|Mb2|Mb1|   |   |   |Shift |   |
      * |-----------------------------------------------------------|
      * |xxx|Gui |Alt  |Mb1                   |Alt  |   |   |   |   |
      * `-----------------------------------------------------------'
      * Mc: Mouse Cursor / Mb: Mouse Button / Mw: Mouse Wheel 
      */
     KEYMAP(KB_ESC, KB_F1,  KB_F2,  KB_F3,  KB_F4,  KB_F5,  KB_F6,  KB_F7,  KB_F8,  KB_F9,  KB_F10, KB_F11, KB_F12, KB_DEL, \
-           KB_TAB, MS_WH_L,MS_WH_U,MS_UP,  MS_WH_D,MS_WH_R,MS_WH_L,MS_WH_D,MS_WH_U,MS_WH_R,KB_NO,  KB_NO,  KB_NO, \
+           KB_TAB, MS_WH_L,MS_WH_D,MS_UP,  MS_WH_U,MS_WH_R,MS_WH_L,MS_WH_D,MS_WH_U,MS_WH_R,KB_NO,  KB_NO,  KB_NO, \
            KB_LCTL,KB_NO,  MS_LEFT,MS_DOWN,MS_RGHT,KB_NO,  MS_LEFT,MS_DOWN,MS_UP,  MS_RGHT,FN_3,   KB_NO,  KB_ENT, \
-           KB_LSFT,KB_NO,  MS_DOWN,KB_NO,  KB_NO,  KB_NO,  MS_BTN2,MS_BTN1,MS_BTN2,MS_BTN3,KB_NO,  KB_RSFT,KB_NO, \
+           KB_LSFT,KB_NO,  KB_NO,  MS_BTN1,MS_BTN2,MS_BTN3,MS_BTN2,MS_BTN1,KB_NO,  KB_NO,  KB_NO,  KB_RSFT,KB_NO, \
            FN_7,   KB_LGUI,KB_LALT,MS_BTN1,KB_RALT,KB_NO,  KB_NO,  KB_NO,  KB_NO),
 
 
@@ -168,5 +168,5 @@ uint8_t keymap_fn_keycode(uint8_t fn_bits)
 
 bool keymap_is_special_mode(uint8_t fn_bits)
 {
-    return (keyboard_modifier_keys == (BIT_LCTRL | BIT_LSHIFT | BIT_LALT | BIT_LGUI));
+    return (usb_keyboard_mods == (BIT_LCTRL | BIT_LSHIFT | BIT_LALT | BIT_LGUI));
 }
diff --git a/usb.c b/usb.c
index 5c3240a47..3011ecb2a 100644
--- a/usb.c
+++ b/usb.c
@@ -478,16 +478,16 @@ ISR(USB_GEN_vect)
 				UEINTX = 0x3A;
 			}
 		}
-		if (keyboard_idle_config && (++div4 & 3) == 0) {
+		if (usb_keyboard_idle_config && (++div4 & 3) == 0) {
 			UENUM = KEYBOARD_ENDPOINT;
 			if (UEINTX & (1<<RWAL)) {
-				keyboard_idle_count++;
-				if (keyboard_idle_count == keyboard_idle_config) {
-					keyboard_idle_count = 0;
-					UEDATX = keyboard_modifier_keys;
+				usb_keyboard_idle_count++;
+				if (usb_keyboard_idle_count == usb_keyboard_idle_config) {
+					usb_keyboard_idle_count = 0;
+					UEDATX = usb_keyboard_mods;
 					UEDATX = 0;
 					for (i=0; i<6; i++) {
-						UEDATX = keyboard_keys[i];
+						UEDATX = usb_keyboard_keys[i];
 					}
 					UEINTX = 0x3A;
 				}
@@ -658,23 +658,23 @@ ISR(USB_COM_vect)
 			if (bmRequestType == 0xA1) {
 				if (bRequest == HID_GET_REPORT) {
 					usb_wait_in_ready();
-					UEDATX = keyboard_modifier_keys;
+					UEDATX = usb_keyboard_mods;
 					UEDATX = 0;
 					for (i=0; i<6; i++) {
-						UEDATX = keyboard_keys[i];
+						UEDATX = usb_keyboard_keys[i];
 					}
 					usb_send_in();
 					return;
 				}
 				if (bRequest == HID_GET_IDLE) {
 					usb_wait_in_ready();
-					UEDATX = keyboard_idle_config;
+					UEDATX = usb_keyboard_idle_config;
 					usb_send_in();
 					return;
 				}
 				if (bRequest == HID_GET_PROTOCOL) {
 					usb_wait_in_ready();
-					UEDATX = keyboard_protocol;
+					UEDATX = usb_keyboard_protocol;
 					usb_send_in();
 					return;
 				}
@@ -682,20 +682,20 @@ ISR(USB_COM_vect)
 			if (bmRequestType == 0x21) {
 				if (bRequest == HID_SET_REPORT) {
 					usb_wait_receive_out();
-					keyboard_leds = UEDATX;
+					usb_keyboard_leds = UEDATX;
 					usb_ack_out();
 					usb_send_in();
 					return;
 				}
 				if (bRequest == HID_SET_IDLE) {
-					keyboard_idle_config = (wValue >> 8);
-					keyboard_idle_count = 0;
+					usb_keyboard_idle_config = (wValue >> 8);
+					usb_keyboard_idle_count = 0;
 					//usb_wait_in_ready();
 					usb_send_in();
 					return;
 				}
 				if (bRequest == HID_SET_PROTOCOL) {
-					keyboard_protocol = wValue;
+					usb_keyboard_protocol = wValue;
 					//usb_wait_in_ready();
 					usb_send_in();
 					return;
diff --git a/usb_keyboard.c b/usb_keyboard.c
index dc781f017..d289af8e0 100644
--- a/usb_keyboard.c
+++ b/usb_keyboard.c
@@ -1,52 +1,40 @@
 #include <avr/interrupt.h>
 #include <avr/pgmspace.h>
+#include "usb_keycodes.h"
 #include "usb_keyboard.h"
 #include "print.h"
 #include "debug.h"
 
 
-static bool is_sent = false;
-
-// which modifier keys are currently pressed
-// 1=left ctrl,    2=left shift,   4=left alt,    8=left gui
-// 16=right ctrl, 32=right shift, 64=right alt, 128=right gui
-uint8_t keyboard_modifier_keys=0;
-
-// which keys are currently pressed, up to 6 keys may be down at once
-uint8_t keyboard_keys[6]={0,0,0,0,0,0};
+// keyboard report.
+static usb_keyboard_report_t _report0 = { {0,0,0,0,0,0}, 0 };
+static usb_keyboard_report_t _report1 = { {0,0,0,0,0,0}, 0 };
+usb_keyboard_report_t *usb_keyboard_report = &_report0;
+usb_keyboard_report_t *usb_keyboard_report_back = &_report1;
 
 // protocol setting from the host.  We use exactly the same report
 // either way, so this variable only stores the setting since we
 // are required to be able to report which setting is in use.
-uint8_t keyboard_protocol=1;
+uint8_t usb_keyboard_protocol=1;
 
 // the idle configuration, how often we send the report to the
 // host (ms * 4) even when it hasn't changed
-uint8_t keyboard_idle_config=125;
+uint8_t usb_keyboard_idle_config=125;
 
 // count until idle timeout
-uint8_t keyboard_idle_count=0;
+uint8_t usb_keyboard_idle_count=0;
 
 // 1=num lock, 2=caps lock, 4=scroll lock, 8=compose, 16=kana
-volatile uint8_t keyboard_leds=0;
+volatile uint8_t usb_keyboard_leds=0;
 
 
-// perform a single keystroke
-int8_t usb_keyboard_press(uint8_t key, uint8_t modifier)
+int8_t usb_keyboard_send(void)
 {
-	int8_t r;
-
-	keyboard_modifier_keys = modifier;
-	keyboard_keys[0] = key;
-	r = usb_keyboard_send();
-	if (r) return r;
-	keyboard_modifier_keys = 0;
-	keyboard_keys[0] = 0;
-	return usb_keyboard_send();
+    return usb_keyboard_send_report(usb_keyboard_report);
 }
 
-// send the contents of keyboard_keys and keyboard_modifier_keys
-int8_t usb_keyboard_send(void)
+
+int8_t usb_keyboard_send_report(usb_keyboard_report_t *report)
 {
 	uint8_t i, intr_state, timeout;
 
@@ -68,54 +56,122 @@ int8_t usb_keyboard_send(void)
 		cli();
 		UENUM = KEYBOARD_ENDPOINT;
 	}
-	UEDATX = keyboard_modifier_keys;
+	UEDATX = report->mods;
 	UEDATX = 0;
 	for (i=0; i<6; i++) {
-		UEDATX = keyboard_keys[i];
+		UEDATX = report->keys[i];
 	}
 	UEINTX = 0x3A;
-	keyboard_idle_count = 0;
+	usb_keyboard_idle_count = 0;
 	SREG = intr_state;
-        is_sent = true;
+
+        report->is_sent =true;
+
+        usb_keyboard_print_report(report);
 	return 0;
 }
 
-void usb_keyboard_init(void) {
-    usb_keyboard_clear();
-    is_sent = false;
+void usb_keyboard_swap_report(void) {
+    usb_keyboard_report_t *tmp = usb_keyboard_report_back;
+    usb_keyboard_report_back = usb_keyboard_report;
+    usb_keyboard_report = tmp;
 }
 
-void usb_keyboard_clear(void) {
-    usb_keyboard_clear_key();
-    usb_keyboard_clear_mod();
+void usb_keyboard_clear_report(void) {
+    usb_keyboard_clear_keys();
+    usb_keyboard_clear_mods();
+    usb_keyboard_report->is_sent = false;
 }
 
-void usb_keyboard_clear_key(void) {
-    for (int i = 0; i < 6; i++) keyboard_keys[i] = 0;
+void usb_keyboard_clear_keys(void) {
+    for (int i = 0; i < 6; i++) usb_keyboard_report->keys[i] = 0;
 }
 
-void usb_keyboard_clear_mod(void) {
-    keyboard_modifier_keys = 0;
+void usb_keyboard_clear_mods(void)
+{
+    usb_keyboard_report->mods = 0;
 }
 
-bool usb_keyboard_is_sent(void) {
-    return is_sent;
+void usb_keyboard_add_code(uint8_t code)
+{
+    if (IS_MOD(code)) {
+        usb_keyboard_add_mod(code);
+    } else {
+        usb_keyboard_add_key(code);
+    }
+}
+
+void usb_keyboard_add_key(uint8_t code)
+{
+    for (int i = 0; i < 6; i++) {
+        if (!usb_keyboard_report->keys[i]) {
+            usb_keyboard_report->keys[i] = code;
+            return;
+        }
+    }
+}
+
+void usb_keyboard_set_keys(uint8_t keys[6])
+{
+    for (int i = 0; i < 6; i++)
+        usb_keyboard_report->keys[i] = keys[i];
+}
+
+void usb_keyboard_set_mods(uint8_t mods)
+{
+    usb_keyboard_report->mods = mods;
 }
 
-bool usb_keyboard_has_key(void) {
+void usb_keyboard_add_mod(uint8_t code)
+{
+    usb_keyboard_report->mods |= MOD_BIT(code);
+}
+
+void usb_keyboard_del_code(uint8_t code)
+{
+    if (IS_MOD(code)) {
+        usb_keyboard_del_mod(code);
+    } else {
+        usb_keyboard_del_key(code);
+    }
+}
+
+void usb_keyboard_del_key(uint8_t code)
+{
+    for (int i = 0; i < 6; i++) {
+        if (usb_keyboard_report->keys[i] == code) {
+            usb_keyboard_report->keys[i] = KB_NO;
+            return;
+        }
+    }
+}
+
+void usb_keyboard_del_mod(uint8_t code)
+{
+    usb_keyboard_report->mods &= ~MOD_BIT(code);
+}
+
+bool usb_keyboard_is_sent(void)
+{
+    return usb_keyboard_report->is_sent;
+}
+
+bool usb_keyboard_has_key(void)
+{
     uint8_t keys = 0;    
-    for (int i = 0; i < 6; i++) keys |= keyboard_keys[i];
+    for (int i = 0; i < 6; i++) keys |= usb_keyboard_report->keys[i];
     return keys ? true : false;
 }
 
-bool usb_keyboard_has_mod(void) {
-    return keyboard_modifier_keys ? true : false;
+bool usb_keyboard_has_mod(void)
+{
+    return usb_keyboard_report->mods ? true : false;
 }
 
-void usb_keyboard_print(void) {
+void usb_keyboard_print_report(usb_keyboard_report_t *report)
+{
     if (!debug_keyboard) return;
-    print("\nkeys: ");
-    for (int i = 0; i < 6; i++) { phex(keyboard_keys[i]); print(" "); }
-    print("\n");
-    print("mods: "); phex(keyboard_modifier_keys); print("\n");
+    print("keys: ");
+    for (int i = 0; i < 6; i++) { phex(report->keys[i]); print(" "); }
+    print(" mods: "); phex(report->mods); print("\n");
 }
diff --git a/usb_keyboard.h b/usb_keyboard.h
index 691ef8b27..4be40aaaf 100644
--- a/usb_keyboard.h
+++ b/usb_keyboard.h
@@ -24,25 +24,50 @@
 #define BIT_LSFT BIT_LSHIFT
 #define BIT_RSFT BIT_RSHIFT
 
+typedef struct report {
+    uint8_t keys[6];
+    uint8_t mods;
+    bool is_sent;
+} usb_keyboard_report_t;
 
-// TODO: change variable name: usb_keyboard_ or usb_kb_
-extern uint8_t keyboard_modifier_keys;
-extern uint8_t keyboard_keys[6];
-extern uint8_t keyboard_protocol;
-extern uint8_t keyboard_idle_config;
-extern uint8_t keyboard_idle_count;
-extern volatile uint8_t keyboard_leds; // TODO: delete NOT USED?
+
+#define usb_keyboard_keys usb_keyboard_report->keys
+#define usb_keyboard_mods usb_keyboard_report->mods
+
+
+extern usb_keyboard_report_t *usb_keyboard_report;
+extern usb_keyboard_report_t *usb_keyboard_report_prev;
+extern uint8_t usb_keyboard_protocol;
+extern uint8_t usb_keyboard_idle_config;
+extern uint8_t usb_keyboard_idle_count;
+extern volatile uint8_t usb_keyboard_leds;
 
 
 int8_t usb_keyboard_press(uint8_t key, uint8_t modifier);
 int8_t usb_keyboard_send(void);
-void usb_keyboard_init(void);
-void usb_keyboard_clear(void);
-void usb_keyboard_clear_key(void);
-void usb_keyboard_clear_mod(void);
+int8_t usb_keyboard_send_report(usb_keyboard_report_t *report);
+
+void usb_keyboard_swap_report(void);
+
+void usb_keyboard_clear_report(void);
+void usb_keyboard_clear_keys(void);
+void usb_keyboard_clear_mods(void);
+
+void usb_keyboard_set_keys(uint8_t keys[6]);
+void usb_keyboard_set_mods(uint8_t mods);
+
+void usb_keyboard_add_code(uint8_t code);
+void usb_keyboard_add_key(uint8_t code);
+void usb_keyboard_add_mod(uint8_t code);
+
+void usb_keyboard_del_code(uint8_t code);
+void usb_keyboard_del_key(uint8_t code);
+void usb_keyboard_del_mod(uint8_t code);
+
 bool usb_keyboard_is_sent(void);
 bool usb_keyboard_has_key(void);
 bool usb_keyboard_has_mod(void);
-void usb_keyboard_print(void);
+
+void usb_keyboard_print_report(usb_keyboard_report_t *report);
 
 #endif