RGB improvements (#1684)

* Allow the knight animation to be restricted to a portion of the LED strip

* Add keys for jumping directly to particular animation modes

* Remove orphaned break statements

* Tweak the `RGB_MODE` buttons so they cycle through the same mode.

* small indentation fix

8 files changed, 699 insertions, 95 deletions

diff --git a/docs/feature_rgblight.md b/docs/feature_rgblight.md
index 7f12155cb..e7b1bb9d2 100644
--- a/docs/feature_rgblight.md
+++ b/docs/feature_rgblight.md
@@ -1,8 +1,107 @@
 # RGB Lighting
 
-<!-- FIXME: Describe how to use RGB Lighting here. -->
+If you've installed addressable RGB lights on your keyboard you can control them with QMK. Currently we support the following addressable LEDs on Atmel AVR processors:
 
-## RGB Under Glow Mod
+* WS2811 and variants (WS2812, WS2812B, WS2812C, etc)
+* SK6812RGBW
+
+Some keyboards come with RGB LEDs pre-installed. Others have to have LEDs installed after the fact. See below for information on modifying your keyboard.
+
+## Selecting Colors
+
+QMK uses Hue, Saturation, and Value to set color rather than using RGB. You can use the color wheel below to see how this works. Changing the Hue will cycle around the circle. Saturation will affect the intensity of the color, which you can see as you move from the inner part to the outer part of the wheel. Value sets the overall brightness.
+
+![gitbook/images/color-wheel.svg]
+
+If you would like to learn more about HSV you can start with the [wikipedia article](https://en.wikipedia.org/wiki/HSL_and_HSV).
+
+## Configuration
+
+Before RGB Lighting can be used you have to enable it in `rules.mk`:
+
+    RGBLIGHT_ENABLE = yes
+
+You can configure the behavior of the RGB lighting by defining values inside `config.h`. 
+
+### Required Configuration
+
+At minimum you have to define the pin your LED strip is connected to and the number of LEDs connected. 
+
+```c
+#define RGB_DI_PIN D7     // The pin the LED strip is connected to
+#define RGBLED_NUM 14     // Number of LEDs in your strip
+```
+
+### Optional Configuration
+
+You can change the behavior of the RGB Lighting by setting these configuration values. Use `#define <Option> <Value>` in a `config.h` at the keyboard, revision, or keymap level.
+
+| Option | Default Value | Description |
+|--------|---------------|-------------|
+| `RGBLIGHT_HUE_STEP` | 10 | How many hues you want to have available. |
+| `RGBLIGHT_SAT_STEP` | 17 | How many steps of saturation you'd like. |
+| `RGBLIGHT_VAL_STEP` | 17 | The number of levels of brightness you want. |
+
+### Animations
+
+If you have `#define RGBLIGHT_ANIMATIONS` in your `config.h` you will have a number of animation modes you can cycle through using the `RGB_MOD` key. You can also `#define` other options to tweak certain animations.
+
+| Option | Default Value | Description |
+|--------|---------------|-------------|
+| `RGBLIGHT_ANIMATIONS` | | `#define` this to enable animation modes. |
+| `RGBLIGHT_EFFECT_SNAKE_LENGTH` | 4 | The number of LEDs to light up for the "snake" mode. |
+| `RGBLIGHT_EFFECT_KNIGHT_LENGTH` | 3 | The number of LEDs to light up for the "knight" mode. |
+| `RGBLIGHT_EFFECT_KNIGHT_OFFSET` | 0 | Start the knight animation this many LEDs from the start of the strip. |
+| `RGBLIGHT_EFFECT_KNIGHT_LED_NUM` | RGBLED_NUM | The number of LEDs to have the "knight" animation travel. |
+| `RGBLIGHT_EFFECT_CHRISTMAS_INTERVAL` | 1000 | How long to wait between light changes for the "christmas" animation. Specified in ms. |
+| `RGBLIGHT_EFFECT_CHRISTMAS_STEP` | 2 | How many LED's to group the red/green colors by for the christmas mode. |
+
+You can also tweak the behavior of the animations by defining these consts in your `keymap.c`. These mostly affect the speed different modes animate at.
+
+```c
+// How long (in ms) to wait between animation steps for the breathing mode
+const uint8_t RGBLED_BREATHING_INTERVALS[] PROGMEM = {30, 20, 10, 5};
+
+// How long (in ms) to wait between animation steps for the rainbow mode
+const uint8_t RGBLED_RAINBOW_MOOD_INTERVALS[] PROGMEM = {120, 60, 30};
+
+// How long (in ms) to wait between animation steps for the swirl mode
+const uint8_t RGBLED_RAINBOW_SWIRL_INTERVALS[] PROGMEM = {100, 50, 20};
+
+// How long (in ms) to wait between animation steps for the snake mode
+const uint8_t RGBLED_SNAKE_INTERVALS[] PROGMEM = {100, 50, 20};
+
+// How long (in ms) to wait between animation steps for the knight modes
+const uint8_t RGBLED_KNIGHT_INTERVALS[] PROGMEM = {127, 63, 31};
+
+// These control which colors are selected for the gradient mode
+const uint16_t RGBLED_GRADIENT_RANGES[] PROGMEM = {360, 240, 180, 120, 90};
+```
+
+## RGB Lighting Keycodes
+
+These control the RGB Lighting functionality.
+
+| Long Name | Short Name | Description |
+|-----------|------------|-------------|
+||`RGB_TOG`|toggle on/off|
+||`RGB_MOD`|cycle through modes|
+||`RGB_HUI`|hue increase|
+||`RGB_HUD`|hue decrease|
+||`RGB_SAI`|saturation increase|
+||`RGB_SAD`|saturation decrease|
+||`RGB_VAI`|value (brightness) increase|
+||`RGB_VAD`|value (brightness) decrease|
+|`RGB_MODE_PLAIN`|`RGB_M_P `| Switch to the static no animation mode |
+|`RGB_MODE_BREATHE`|`RGB_M_B`| Switch to the breathing mode |
+|`RGB_MODE_RAINBOW`|`RGB_M_R`| Switch to the rainbow mode ||
+|`RGB_MODE_SWIRL`|`RGB_M_SW`| Switch to the swirl mode |
+|`RGB_MODE_SNAKE`|`RGB_M_SN`| Switch to the snake mode |
+|`RGB_MODE_KNIGHT`|`RGB_M_K`| Switch to the knight animation |
+|`RGB_MODE_XMAS`|`RGB_M_X`| Switch to the Christmas animation |
+|`RGB_MODE_GRADIENT`|`RGB_M_G`| Switch to the static gradient mode |
+
+## Hardware Modification
 
 ![Planck with RGB Underglow](https://raw.githubusercontent.com/qmk/qmk_firmware/master/keyboards/planck/keymaps/yang/planck-with-rgb-underglow.jpg)
 
@@ -17,33 +116,6 @@ In order to use the underglow animation functions, you need to have `#define RGB
 Please add the following options into your config.h, and set them up according your hardware configuration. These settings are for the `F4` pin by default:
 
     #define RGB_DI_PIN F4     // The pin your RGB strip is wired to
-    #define RGBLIGHT_ANIMATIONS    // Require for fancier stuff (not compatible with audio)
     #define RGBLED_NUM 14     // Number of LEDs
-    #define RGBLIGHT_HUE_STEP 10
-    #define RGBLIGHT_SAT_STEP 17
-    #define RGBLIGHT_VAL_STEP 17
 
 You'll need to edit `RGB_DI_PIN` to the pin you have your `DI` on your RGB strip wired to.
-
-The firmware supports 5 different light effects, and the color (hue, saturation, brightness) can be customized in most effects. To control the underglow, you need to modify your keymap file to assign those functions to some keys/key combinations. For details, please check this keymap. `keyboards/planck/keymaps/yang/keymap.c`
-
-### WS2812 Wiring
-
-![WS2812 Wiring](https://raw.githubusercontent.com/qmk/qmk_firmware/master/keyboards/planck/keymaps/yang/WS2812-wiring.jpg)
-
-Please note the USB port can only supply a limited amount of power to the keyboard (500mA by standard, however, modern computer and most usb hubs can provide 700+mA.). According to the data of NeoPixel from Adafruit, 30 WS2812 LEDs require a 5V 1A power supply, LEDs used in this mod should not more than 20.
-
-## RGB Lighting Keycodes
-
-This controls the RGB Lighting functionality. Most keyboards use WS2812 (and compatible) LEDs for underlight or case lighting.
-
-|Name|Description|
-|----|-----------|
-|`RGB_TOG`|toggle on/off|
-|`RGB_MOD`|cycle through modes|
-|`RGB_HUI`|hue increase|
-|`RGB_HUD`|hue decrease|
-|`RGB_SAI`|saturation increase|
-|`RGB_SAD`|saturation decrease|
-|`RGB_VAI`|value increase|
-|`RGB_VAD`|value decrease|
diff --git a/docs/gitbook/images/color-wheel.svg b/docs/gitbook/images/color-wheel.svg
new file mode 100644
index 000000000..83e599477
--- /dev/null
+++ b/docs/gitbook/images/color-wheel.svg
@@ -0,0 +1,441 @@
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+          fill="#ECDCFF"
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diff --git a/keyboards/clueboard/keymaps/default/keymap.c b/keyboards/clueboard/keymaps/default/keymap.c
index c4da561fe..dbfc04c57 100644
--- a/keyboards/clueboard/keymaps/default/keymap.c
+++ b/keyboards/clueboard/keymaps/default/keymap.c
@@ -5,8 +5,6 @@
 
 // Each layer gets a name for readability, which is then used in the keymap matrix below.
 // The underscores don't mean anything - you can have a layer called STUFF or any other name.
-// Layer names don't all need to be of the same length, obviously, and you can also skip them
-// entirely and just use numbers.
 #define _BL 0
 #define _FL 1
 #define _CL 2
@@ -33,7 +31,7 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
   /* Keymap _CL: Control layer
    */
 [_CL] = KEYMAP(
-  BL_STEP,_______,_______,_______,_______,_______,_______,_______,_______,_______,_______,_______,_______,_______,RGB_TOG,        RGB_VAI, \
+  BL_STEP,RGB_M_P,RGB_M_B,RGB_M_R,RGB_M_SW,RGB_M_SN,RGB_M_K,RGB_M_X,RGB_M_G,_______,_______,_______,_______,_______,RGB_TOG,        RGB_VAI, \
   _______,_______,_______,_______,RESET,  _______,_______,_______,_______,_______,_______,_______,_______,_______,                RGB_VAD, \
   _______,_______,MO(_CL),_______,_______,_______,_______,_______,_______,_______,_______,_______,_______,_______,                         \
   MO(_FL),_______,_______,_______,_______,_______,_______,_______,_______,_______,_______,_______,_______,_______,        RGB_SAI,         \
diff --git a/keyboards/clueboard/rev2/config.h b/keyboards/clueboard/rev2/config.h
index 8435fd02b..bc34fc07b 100644
--- a/keyboards/clueboard/rev2/config.h
+++ b/keyboards/clueboard/rev2/config.h
@@ -30,10 +30,17 @@
 /* Underlight configuration
  */
 #define RGB_DI_PIN D7
-#define RGBLIGHT_ANIMATIONS
 #define RGBLED_NUM 14     // Number of LEDs
-#define RGBLIGHT_HUE_STEP 10
+#define RGBLIGHT_HUE_STEP 32
 #define RGBLIGHT_SAT_STEP 17
 #define RGBLIGHT_VAL_STEP 17
 
+#define RGBLIGHT_ANIMATIONS
+#define RGBLIGHT_EFFECT_CHRISTMAS_INTERVAL 666*2
+#define RGBLIGHT_EFFECT_CHRISTMAS_STEP 1
+#define RGBLIGHT_EFFECT_KNIGHT_LENGTH 3   // How many LEDs wide to light up
+#define RGBLIGHT_EFFECT_KNIGHT_OFFSET 1   // The led to start at
+#define RGBLIGHT_EFFECT_KNIGHT_LED_NUM 5  // How many LEDs to travel
+#define RGBLIGHT_EFFECT_SNAKE_LENGTH 4    // How many LEDs wide to light up
+
 #endif
diff --git a/quantum/quantum.c b/quantum/quantum.c
index 87975ef99..285e1e81e 100644
--- a/quantum/quantum.c
+++ b/quantum/quantum.c
@@ -249,105 +249,153 @@ bool process_record_quantum(keyrecord_t *record) {
       if (record->event.pressed) {
         reset_keyboard();
       }
-	  return false;
-      break;
+    return false;
     case DEBUG:
       if (record->event.pressed) {
           debug_enable = true;
           print("DEBUG: enabled.\n");
       }
-	  return false;
-      break;
+    return false;
   #ifdef FAUXCLICKY_ENABLE
   case FC_TOG:
     if (record->event.pressed) {
       FAUXCLICKY_TOGGLE;
     }
     return false;
-    break;
   case FC_ON:
     if (record->event.pressed) {
       FAUXCLICKY_ON;
     }
     return false;
-    break;
   case FC_OFF:
     if (record->event.pressed) {
       FAUXCLICKY_OFF;
     }
     return false;
-    break;
   #endif
-	#ifdef RGBLIGHT_ENABLE
-	case RGB_TOG:
-		if (record->event.pressed) {
-			rgblight_toggle();
-      }
-	  return false;
-      break;
-	case RGB_MOD:
-		if (record->event.pressed) {
-			rgblight_step();
-      }
-	  return false;
-      break;
-	case RGB_HUI:
-		if (record->event.pressed) {
-			rgblight_increase_hue();
+  #ifdef RGBLIGHT_ENABLE
+  case RGB_TOG:
+    if (record->event.pressed) {
+      rgblight_toggle();
+    }
+    return false;
+  case RGB_MOD:
+    if (record->event.pressed) {
+      rgblight_step();
+    }
+    return false;
+  case RGB_HUI:
+    if (record->event.pressed) {
+      rgblight_increase_hue();
+    }
+    return false;
+  case RGB_HUD:
+    if (record->event.pressed) {
+      rgblight_decrease_hue();
+    }
+    return false;
+  case RGB_SAI:
+    if (record->event.pressed) {
+      rgblight_increase_sat();
+    }
+    return false;
+  case RGB_SAD:
+    if (record->event.pressed) {
+      rgblight_decrease_sat();
+    }
+    return false;
+  case RGB_VAI:
+    if (record->event.pressed) {
+      rgblight_increase_val();
+    }
+    return false;
+  case RGB_VAD:
+    if (record->event.pressed) {
+      rgblight_decrease_val();
+    }
+    return false;
+  case RGB_MODE_PLAIN:
+    if (record->event.pressed) {
+      rgblight_mode(1);
+    }
+    return false;
+  case RGB_MODE_BREATHE:
+    if (record->event.pressed) {
+      if ((2 <= rgblight_get_mode()) && (rgblight_get_mode() < 5)) {
+        rgblight_step();
+      } else {
+        rgblight_mode(2);
       }
-	  return false;
-      break;
-	case RGB_HUD:
-		if (record->event.pressed) {
-			rgblight_decrease_hue();
+    }
+    return false;
+  case RGB_MODE_RAINBOW:
+    if (record->event.pressed) {
+      if ((6 <= rgblight_get_mode()) && (rgblight_get_mode() < 8)) {
+        rgblight_step();
+      } else {
+        rgblight_mode(6);
       }
-	  return false;
-      break;
-	case RGB_SAI:
-		if (record->event.pressed) {
-			rgblight_increase_sat();
+    }
+    return false;
+  case RGB_MODE_SWIRL:
+    if (record->event.pressed) {
+      if ((9 <= rgblight_get_mode()) && (rgblight_get_mode() < 14)) {
+        rgblight_step();
+      } else {
+        rgblight_mode(9);
       }
-	  return false;
-      break;
-	case RGB_SAD:
-		if (record->event.pressed) {
-			rgblight_decrease_sat();
+    }
+    return false;
+  case RGB_MODE_SNAKE:
+    if (record->event.pressed) {
+      if ((15 <= rgblight_get_mode()) && (rgblight_get_mode() < 20)) {
+        rgblight_step();
+      } else {
+        rgblight_mode(15);
       }
-	  return false;
-      break;
-	case RGB_VAI:
-		if (record->event.pressed) {
-			rgblight_increase_val();
+    }
+    return false;
+  case RGB_MODE_KNIGHT:
+    if (record->event.pressed) {
+      if ((21 <= rgblight_get_mode()) && (rgblight_get_mode() < 23)) {
+        rgblight_step();
+      } else {
+        rgblight_mode(21);
       }
-	  return false;
-      break;
-	case RGB_VAD:
-		if (record->event.pressed) {
-			rgblight_decrease_val();
+    }
+    return false;
+  case RGB_MODE_XMAS:
+    if (record->event.pressed) {
+      rgblight_mode(24);
+    }
+    return false;
+  case RGB_MODE_GRADIENT:
+    if (record->event.pressed) {
+      if ((25 <= rgblight_get_mode()) && (rgblight_get_mode() < 34)) {
+        rgblight_step();
+      } else {
+        rgblight_mode(25);
       }
-	  return false;
-      break;
-	#endif
+    }
+    return false;
+  #endif
     #ifdef PROTOCOL_LUFA
     case OUT_AUTO:
       if (record->event.pressed) {
         set_output(OUTPUT_AUTO);
       }
       return false;
-      break;
     case OUT_USB:
       if (record->event.pressed) {
         set_output(OUTPUT_USB);
       }
       return false;
-      break;
     #ifdef BLUETOOTH_ENABLE
     case OUT_BT:
       if (record->event.pressed) {
         set_output(OUTPUT_BLUETOOTH);
       }
       return false;
-      break;
     #endif
     #endif
     case MAGIC_SWAP_CONTROL_CAPSLOCK ... MAGIC_TOGGLE_NKRO:
@@ -454,7 +502,6 @@ bool process_record_quantum(keyrecord_t *record) {
         unregister_mods(MOD_BIT(KC_LSFT));
       }
       return false;
-      // break;
     }
 
     case KC_RSPC: {
@@ -477,7 +524,6 @@ bool process_record_quantum(keyrecord_t *record) {
         unregister_mods(MOD_BIT(KC_RSFT));
       }
       return false;
-      // break;
     }
     case GRAVE_ESC: {
       uint8_t shifted = get_mods() & ((MOD_BIT(KC_LSHIFT)|MOD_BIT(KC_RSHIFT)
diff --git a/quantum/quantum_keycodes.h b/quantum/quantum_keycodes.h
index 1bb6706ba..ccd4565f5 100644
--- a/quantum/quantum_keycodes.h
+++ b/quantum/quantum_keycodes.h
@@ -401,6 +401,14 @@ enum quantum_keycodes {
     RGB_SAD,
     RGB_VAI,
     RGB_VAD,
+    RGB_MODE_PLAIN,
+    RGB_MODE_BREATHE,
+    RGB_MODE_RAINBOW,
+    RGB_MODE_SWIRL,
+    RGB_MODE_SNAKE,
+    RGB_MODE_KNIGHT,
+    RGB_MODE_XMAS,
+    RGB_MODE_GRADIENT,
 
     // Left shift, open paren
     KC_LSPO,
@@ -534,6 +542,14 @@ enum quantum_keycodes {
 
 #define KC_GESC GRAVE_ESC
 
+#define RGB_M_P RGB_MODE_PLAIN
+#define RGB_M_B RGB_MODE_BREATHE
+#define RGB_M_R RGB_MODE_RAINBOW
+#define RGB_M_SW RGB_MODE_SWIRL
+#define RGB_M_SN RGB_MODE_SNAKE
+#define RGB_M_K RGB_MODE_KNIGHT
+#define RGB_M_X RGB_MODE_XMAS
+#define RGB_M_G RGB_MODE_GRADIENT
 
 // L-ayer, T-ap - 256 keycode max, 16 layer max
 #define LT(layer, kc) (kc | QK_LAYER_TAP | ((layer & 0xF) << 8))
diff --git a/quantum/rgblight.c b/quantum/rgblight.c
index 1b5076450..5ae6e69d6 100644
--- a/quantum/rgblight.c
+++ b/quantum/rgblight.c
@@ -22,7 +22,6 @@
 #include "debug.h"
 #include "led_tables.h"
 
-
 __attribute__ ((weak))
 const uint8_t RGBLED_BREATHING_INTERVALS[] PROGMEM = {30, 20, 10, 5};
 __attribute__ ((weak))
@@ -32,7 +31,7 @@ const uint8_t RGBLED_RAINBOW_SWIRL_INTERVALS[] PROGMEM = {100, 50, 20};
 __attribute__ ((weak))
 const uint8_t RGBLED_SNAKE_INTERVALS[] PROGMEM = {100, 50, 20};
 __attribute__ ((weak))
-const uint8_t RGBLED_KNIGHT_INTERVALS[] PROGMEM = {100, 50, 20};
+const uint8_t RGBLED_KNIGHT_INTERVALS[] PROGMEM = {127, 63, 31};
 __attribute__ ((weak))
 const uint16_t RGBLED_GRADIENT_RANGES[] PROGMEM = {360, 240, 180, 120, 90};
 
@@ -197,6 +196,14 @@ void rgblight_step_reverse(void) {
   rgblight_mode(mode);
 }
 
+uint32_t rgblight_get_mode(void) {
+  if (!rgblight_config.enable) {
+    return false;
+  }
+
+  return rgblight_config.mode;
+}
+
 void rgblight_mode(uint8_t mode) {
   if (!rgblight_config.enable) {
     return;
@@ -220,6 +227,8 @@ void rgblight_mode(uint8_t mode) {
     // MODE 9-14, rainbow swirl
     // MODE 15-20, snake
     // MODE 21-23, knight
+    // MODE 24, xmas
+    // MODE 25-34, static rainbow
 
     #ifdef RGBLIGHT_ANIMATIONS
       rgblight_timer_enable();
@@ -550,7 +559,14 @@ void rgblight_effect_knight(uint8_t interval) {
   static int8_t increment = 1;
   uint8_t i, cur;
 
+  // Set all the LEDs to 0
   for (i = 0; i < RGBLED_NUM; i++) {
+    led[i].r = 0;
+    led[i].g = 0;
+    led[i].b = 0;
+  }
+  // Determine which LEDs should be lit up
+  for (i = 0; i < RGBLIGHT_EFFECT_KNIGHT_LED_NUM; i++) {
     cur = (i + RGBLIGHT_EFFECT_KNIGHT_OFFSET) % RGBLED_NUM;
 
     if (i >= low_bound && i <= high_bound) {
@@ -563,10 +579,12 @@ void rgblight_effect_knight(uint8_t interval) {
   }
   rgblight_set();
 
+  // Move from low_bound to high_bound changing the direction we increment each
+  // time a boundary is hit.
   low_bound += increment;
   high_bound += increment;
 
-  if (high_bound <= 0 || low_bound >= RGBLED_NUM - 1) {
+  if (high_bound <= 0 || low_bound >= RGBLIGHT_EFFECT_KNIGHT_LED_NUM - 1) {
     increment = -increment;
   }
 }
diff --git a/quantum/rgblight.h b/quantum/rgblight.h
index d0dd6e490..7acd5a257 100644
--- a/quantum/rgblight.h
+++ b/quantum/rgblight.h
@@ -23,16 +23,21 @@
 #endif
 
 #ifndef RGBLIGHT_EFFECT_SNAKE_LENGTH
-#define RGBLIGHT_EFFECT_SNAKE_LENGTH 7
+#define RGBLIGHT_EFFECT_SNAKE_LENGTH 4
 #endif
 
 #ifndef RGBLIGHT_EFFECT_KNIGHT_LENGTH
-#define RGBLIGHT_EFFECT_KNIGHT_LENGTH 7
+#define RGBLIGHT_EFFECT_KNIGHT_LENGTH 3
 #endif
+
 #ifndef RGBLIGHT_EFFECT_KNIGHT_OFFSET
 #define RGBLIGHT_EFFECT_KNIGHT_OFFSET 0
 #endif
 
+#ifndef RGBLIGHT_EFFECT_KNIGHT_LED_NUM
+#define RGBLIGHT_EFFECT_KNIGHT_LED_NUM RGBLED_NUM
+#endif
+
 #ifndef RGBLIGHT_EFFECT_CHRISTMAS_INTERVAL
 #define RGBLIGHT_EFFECT_CHRISTMAS_INTERVAL 1000
 #endif
@@ -85,6 +90,7 @@ void rgblight_toggle(void);
 void rgblight_enable(void);
 void rgblight_step(void);
 void rgblight_step_reverse(void);
+uint32_t rgblight_get_mode(void);
 void rgblight_mode(uint8_t mode);
 void rgblight_set(void);
 void rgblight_update_dword(uint32_t dword);