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-rw-r--r--docs/_summary.md20
-rw-r--r--docs/cli_commands.md12
-rw-r--r--docs/config_options.md2
-rw-r--r--docs/data_driven_config.md5
-rw-r--r--docs/feature_caps_word.md156
-rw-r--r--docs/feature_encoders.md36
-rw-r--r--docs/feature_hd44780.md345
-rw-r--r--docs/feature_joystick.md2
-rw-r--r--docs/feature_midi.md6
-rw-r--r--docs/feature_pointing_device.md32
-rw-r--r--docs/feature_rgb_matrix.md14
-rw-r--r--docs/feature_rgblight.md13
-rw-r--r--docs/feature_swap_hands.md13
-rw-r--r--docs/feature_unicode.md11
-rw-r--r--docs/flashing.md11
-rw-r--r--docs/gpio_control.md (renamed from docs/internals_gpio_control.md)0
-rw-r--r--docs/internals/defines.md (renamed from docs/internals_defines.md)0
-rw-r--r--docs/internals/input_callback_reg.md (renamed from docs/internals_input_callback_reg.md)0
-rw-r--r--docs/internals/midi_device.md (renamed from docs/internals_midi_device.md)0
-rw-r--r--docs/internals/midi_device_setup_process.md (renamed from docs/internals_midi_device_setup_process.md)0
-rw-r--r--docs/internals/midi_util.md (renamed from docs/internals_midi_util.md)0
-rw-r--r--docs/internals/send_functions.md (renamed from docs/internals_send_functions.md)0
-rw-r--r--docs/internals/sysex_tools.md (renamed from docs/internals_sysex_tools.md)0
-rw-r--r--docs/ja/_summary.md16
-rw-r--r--docs/ja/feature_unicode.md11
-rw-r--r--docs/ja/gpio_control.md (renamed from docs/ja/internals_gpio_control.md)4
-rw-r--r--docs/ja/internals_defines.md78
-rw-r--r--docs/ja/internals_input_callback_reg.md173
-rw-r--r--docs/ja/internals_midi_device.md148
-rw-r--r--docs/ja/internals_midi_device_setup_process.md36
-rw-r--r--docs/ja/internals_midi_util.md59
-rw-r--r--docs/ja/internals_send_functions.md246
-rw-r--r--docs/ja/internals_sysex_tools.md66
-rw-r--r--docs/ja/proton_c_conversion.md2
-rw-r--r--docs/keycodes.md20
-rw-r--r--docs/proton_c_conversion.md2
-rw-r--r--docs/quantum_keycodes.md12
-rw-r--r--docs/quantum_painter.md705
-rw-r--r--docs/quantum_painter_qff.md103
-rw-r--r--docs/quantum_painter_qgf.md178
-rw-r--r--docs/quantum_painter_rle.md29
-rw-r--r--docs/squeezing_avr.md13
-rw-r--r--docs/tap_hold.md2
-rw-r--r--docs/zh-cn/_summary.md16
44 files changed, 1665 insertions, 932 deletions
diff --git a/docs/_summary.md b/docs/_summary.md
index 74203aa0f8..fed75196b4 100644
--- a/docs/_summary.md
+++ b/docs/_summary.md
@@ -75,6 +75,7 @@
* Software Features
* [Auto Shift](feature_auto_shift.md)
+ * [Caps Word](feature_caps_word.md)
* [Combos](feature_combo.md)
* [Debounce API](feature_debounce_type.md)
* [Key Lock](feature_key_lock.md)
@@ -94,7 +95,8 @@
* Hardware Features
* Displays
- * [HD44780 LCD Controller](feature_hd44780.md)
+ * [Quantum Painter](quantum_painter.md)
+ * [HD44780 LCD Driver](feature_hd44780.md)
* [ST7565 LCD Driver](feature_st7565.md)
* [OLED Driver](feature_oled_driver.md)
* Lighting
@@ -147,7 +149,7 @@
* [EEPROM Driver](eeprom_driver.md)
* ['serial' Driver](serial_driver.md)
* [UART Driver](uart_driver.md)
- * [GPIO Controls](internals_gpio_control.md)
+ * [GPIO Controls](gpio_control.md)
* [Keyboard Guidelines](hardware_keyboard_guidelines.md)
* Python Development
@@ -183,10 +185,10 @@
* [Understanding QMK](understanding_qmk.md)
* QMK Internals (In Progress)
- * [Defines](internals_defines.md)
- * [Input Callback Reg](internals_input_callback_reg.md)
- * [Midi Device](internals_midi_device.md)
- * [Midi Device Setup Process](internals_midi_device_setup_process.md)
- * [Midi Util](internals_midi_util.md)
- * [Send Functions](internals_send_functions.md)
- * [Sysex Tools](internals_sysex_tools.md)
+ * [Defines](internals/defines.md)
+ * [Input Callback Reg](internals/input_callback_reg.md)
+ * [Midi Device](internals/midi_device.md)
+ * [Midi Device Setup Process](internals/midi_device_setup_process.md)
+ * [Midi Util](internals/midi_util.md)
+ * [Send Functions](internals/send_functions.md)
+ * [Sysex Tools](internals/sysex_tools.md)
diff --git a/docs/cli_commands.md b/docs/cli_commands.md
index 463abcef12..a380d3eb2f 100644
--- a/docs/cli_commands.md
+++ b/docs/cli_commands.md
@@ -515,3 +515,15 @@ Run single test:
qmk pytest -t qmk.tests.test_cli_commands.test_c2json
qmk pytest -t qmk.tests.test_qmk_path
+
+## `qmk painter-convert-graphics`
+
+This command converts images to a format usable by QMK, i.e. the QGF File Format. See the [Quantum Painter](quantum_painter.md?id=quantum-painter-cli) documentation for more information on this command.
+
+## `qmk painter-make-font-image`
+
+This command converts a TTF font to an intermediate format for editing, before converting to the QFF File Format. See the [Quantum Painter](quantum_painter.md?id=quantum-painter-cli) documentation for more information on this command.
+
+## `qmk painter-convert-font-image`
+
+This command converts an intermediate font image to the QFF File Format. See the [Quantum Painter](quantum_painter.md?id=quantum-painter-cli) documentation for more information on this command.
diff --git a/docs/config_options.md b/docs/config_options.md
index 838c4d86fd..8227a0e074 100644
--- a/docs/config_options.md
+++ b/docs/config_options.md
@@ -131,6 +131,8 @@ If you define these options you will disable the associated feature, which can s
If you define these options you will enable the associated feature, which may increase your code size.
+* `#define ENABLE_COMPILE_KEYCODE`
+ * Enables the `QK_MAKE` keycode
* `#define FORCE_NKRO`
* NKRO by default requires to be turned on, this forces it on during keyboard startup regardless of EEPROM setting. NKRO can still be turned off but will be turned on again if the keyboard reboots.
* `#define STRICT_LAYER_RELEASE`
diff --git a/docs/data_driven_config.md b/docs/data_driven_config.md
index 38fb5dbf14..cdcf21a19c 100644
--- a/docs/data_driven_config.md
+++ b/docs/data_driven_config.md
@@ -44,7 +44,7 @@ In other cases you should group like options together in an `object`. This is pa
In most cases you can add a simple mapping. These are maintained as JSON files in `data/mappings/info_config.json` and `data/mappings/info_rules.json`, and control mapping for `config.h` and `rules.mk`, respectively. Each mapping is keyed by the `config.h` or `rules.mk` variable, and the value is a hash with the following keys:
* `info_key`: (required) The location within `info.json` for this value. See below.
-* `value_type`: (optional) Default `str`. The format for this variable's value. See below.
+* `value_type`: (optional) Default `raw`. The format for this variable's value. See below.
* `to_json`: (optional) Default `true`. Set to `false` to exclude this mapping from info.json
* `to_c`: (optional) Default `true`. Set to `false` to exclude this mapping from config.h
* `warn_duplicate`: (optional) Default `true`. Set to `false` to turn off warning when a value exists in both places
@@ -57,7 +57,7 @@ Under the hood we use [Dotty Dict](https://dotty-dict.readthedocs.io/en/latest/)
#### Value Types
-By default we treat all values as simple strings. If your value is more complex you can use one of these types to intelligently parse the data:
+By default we treat all values as unquoted "raw" data. If your value is more complex you can use one of these types to intelligently parse the data:
* `array`: A comma separated array of strings
* `array.int`: A comma separated array of integers
@@ -65,6 +65,7 @@ By default we treat all values as simple strings. If your value is more complex
* `hex`: A number formatted as hex
* `list`: A space separate array of strings
* `mapping`: A hash of key/value pairs
+* `str`: A quoted string literal
### Add code to extract it
diff --git a/docs/feature_caps_word.md b/docs/feature_caps_word.md
new file mode 100644
index 0000000000..0b71119917
--- /dev/null
+++ b/docs/feature_caps_word.md
@@ -0,0 +1,156 @@
+# Caps Word
+
+It is often useful to type a single word in all capitals, for instance
+abbreviations like "QMK", or in code, identifiers like `KC_SPC`. "Caps Word" is
+a modern alternative to Caps Lock:
+
+* Letters are capitalized while active, and Caps Word automatically disables
+ itself at the end of the word. That is, it stops by default once a space or
+ any key other than `a`--`z`, `0`--`9`, `-`, `_`, delete, or backspace is
+ pressed. Caps Word also disables itself if the keyboard is idle for 5 seconds.
+ This is configurable, see below.
+
+* To avoid requiring a dedicated key for Caps Word, there is an option
+ (`BOTH_SHIFTS_TURNS_ON_CAPS_WORD`) to activate Caps Word by simultaneously
+ pressing both shift keys. See below for other options.
+
+* The implementation does not use the Caps Lock (`KC_CAPS`) keycode. Caps Word
+ works even if you're remapping Caps Lock at the OS level to Ctrl or something
+ else, as Emacs and Vim users often do.
+
+
+## How do I enable Caps Word :id=how-do-i-enable-caps-word
+
+In your `rules.mk`, add:
+
+```make
+CAPS_WORD_ENABLE = yes
+```
+
+Next, use one the following methods to activate Caps Word:
+
+* **Activate by pressing a key**: Use the `CAPS_WORD` keycode (short
+ alias `CAPSWRD`) in your keymap.
+
+* **Activate by pressing Left Shift + Right Shift**: Add `#define
+ BOTH_SHIFTS_TURNS_ON_CAPS_WORD` to config.h. You may also need to disable or
+ reconfigure Command, details below. Then, simultaneously pressing both left
+ and right shifts turns on Caps Word. This method works with the plain
+ `KC_LSFT` and `KC_RSFT` keycodes as well as one-shot shifts and Space Cadet
+ shifts. If your shift keys are mod-taps, hold both shift mod-tap keys until
+ the tapping term, then release them.
+
+* **Activate by double tapping Left Shift**: Add `#define
+ DOUBLE_TAP_SHIFT_TURNS_ON_CAPS_WORD` config.h. Then, double tapping Left Shift
+ turns on Caps Word. This method works with `KC_LSFT` or one-shot Left Shift
+ `OSM(MOD_LSFT)`. To count as a double tap, the maximum time in milliseconds
+ between taps is `TAPPING_TERM`, or if using `TAPPING_TERM_PER_KEY`, the time
+ returned by `get_tapping_term()` for the shift keycode being tapped.
+
+* **Custom activation**: You can activate Caps Word from code by calling
+ `caps_word_on()`. This may be used to activate Caps Word through [a
+ combo](feature_combo.md) or [tap dance](feature_tap_dance.md) or any means
+ you like.
+
+### Troubleshooting: Command :id=troubleshooting-command
+
+When using `BOTH_SHIFTS_TURNS_ON_CAPS_WORD`, you might see a compile message
+**"BOTH_SHIFTS_TURNS_ON_CAPS_WORD and Command should not be enabled at the same
+time, since both use the Left Shift + Right Shift key combination."**
+
+Many keyboards enable the [Command feature](feature_command.md), which by
+default is also activated using the Left Shift + Right Shift key combination. To
+fix this conflict, please disable Command by adding in rules.mk:
+
+```make
+COMMAND_ENABLE = no
+```
+
+Or configure Command to use another key combination like Left Ctrl + Right Ctrl
+by defining `IS_COMMAND()` in config.h:
+
+```c
+// Activate Command with Left Ctrl + Right Ctrl.
+#define IS_COMMAND() (get_mods() == MOD_MASK_CTRL)
+```
+
+
+## Customizing Caps Word :id=customizing-caps-word
+
+### Idle timeout :id=idle-timeout
+
+Caps Word turns off automatically if no keys are pressed for
+`CAPS_WORD_IDLE_TIMEOUT` milliseconds. The default is 5000 (5 seconds).
+Configure the timeout duration in config.h, for instance
+
+```c
+#define CAPS_WORD_IDLE_TIMEOUT 3000 // 3 seconds.
+```
+
+Setting `CAPS_WORD_IDLE_TIMEOUT` to 0 configures Caps Word to never time out.
+Caps Word then remains active indefinitely until a word breaking key is pressed.
+
+
+### Functions :id=functions
+
+Functions to manipulate Caps Word:
+
+| Function | Description |
+|-------------------------|------------------------------------------------|
+| `caps_word_on()` | Turns Caps Word on. |
+| `caps_word_off()` | Turns Caps Word off. |
+| `caps_word_toggle()` | Toggles Caps Word. |
+| `is_caps_word_on()` | Returns true if Caps Word is currently on. |
+
+
+### Configure which keys are "word breaking" :id=configure-which-keys-are-word-breaking
+
+You can define the `caps_word_press_user(uint16_t keycode)` callback to
+configure which keys should be shifted and which keys are considered "word
+breaking" and stop Caps Word.
+
+The callback is called on every key press while Caps Word is active. When the
+key should be shifted (that is, a letter key), the callback should call
+`add_weak_mods(MOD_BIT(KC_LSFT))` to shift the key. Returning true continues the
+current "word," while returning false is "word breaking" and deactivates Caps
+Word. The default callback is
+
+```c
+bool caps_word_press_user(uint16_t keycode) {
+ switch (keycode) {
+ // Keycodes that continue Caps Word, with shift applied.
+ case KC_A ... KC_Z:
+ case KC_MINS:
+ add_weak_mods(MOD_BIT(KC_LSFT)); // Apply shift to next key.
+ return true;
+
+ // Keycodes that continue Caps Word, without shifting.
+ case KC_1 ... KC_0:
+ case KC_BSPC:
+ case KC_DEL:
+ case KC_UNDS:
+ return true;
+
+ default:
+ return false; // Deactivate Caps Word.
+ }
+}
+```
+
+
+### Representing Caps Word state :id=representing-caps-word-state
+
+Define `caps_word_set_user(bool active)` to get callbacks when Caps Word turns
+on or off. This is useful to represent the current Caps Word state, e.g. by
+setting an LED or playing a sound. In your keymap, define
+
+```c
+void caps_word_set_user(bool active) {
+ if (active) {
+ // Do something when Caps Word activates.
+ } else {
+ // Do something when Caps Word deactivates.
+ }
+}
+```
+
diff --git a/docs/feature_encoders.md b/docs/feature_encoders.md
index 6a1a3750a6..a3d56fd5ef 100644
--- a/docs/feature_encoders.md
+++ b/docs/feature_encoders.md
@@ -54,9 +54,43 @@ If you are using different pinouts for the encoders on each half of a split keyb
#define ENCODER_RESOLUTIONS_RIGHT { 2, 4 }
```
+If the `_RIGHT` definitions aren't specified in your `config.h`, then the non-`_RIGHT` versions will be applied to both sides of the split.
+
+Additionally, if one side does not have an encoder, you can specify `{}` for the pins/resolution -- for example, a split keyboard with only a right-side encoder:
+
+```c
+#define ENCODERS_PAD_A { }
+#define ENCODERS_PAD_B { }
+#define ENCODER_RESOLUTIONS { }
+#define ENCODERS_PAD_A_RIGHT { B12 }
+#define ENCODERS_PAD_B_RIGHT { B13 }
+#define ENCODER_RESOLUTIONS_RIGHT { 4 }
+```
+
+## Encoder map
+
+Encoder mapping may be added to your `keymap.c`, which replicates the normal keyswitch layer handling functionality, but with encoders. Add this to your `rules.mk`:
+
+```make
+ENCODER_MAP_ENABLE = yes
+```
+
+Your `keymap.c` will then need an encoder mapping defined (for four layers and two encoders):
+
+```c
+#if defined(ENCODER_MAP_ENABLE)
+const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][2] = {
+ [_BASE] = { ENCODER_CCW_CW(KC_MS_WH_UP, KC_MS_WH_DOWN), ENCODER_CCW_CW(KC_VOLD, KC_VOLU) },
+ [_LOWER] = { ENCODER_CCW_CW(RGB_HUD, RGB_HUI), ENCODER_CCW_CW(RGB_SAD, RGB_SAI) },
+ [_RAISE] = { ENCODER_CCW_CW(RGB_VAD, RGB_VAI), ENCODER_CCW_CW(RGB_SPD, RGB_SPI) },
+ [_ADJUST] = { ENCODER_CCW_CW(RGB_RMOD, RGB_MOD), ENCODER_CCW_CW(KC_RIGHT, KC_LEFT) },
+};
+#endif
+```
+
## Callbacks
-The callback functions can be inserted into your `<keyboard>.c`:
+When not using `ENCODER_MAP_ENABLE = yes`, the callback functions can be inserted into your `<keyboard>.c`:
```c
bool encoder_update_kb(uint8_t index, bool clockwise) {
diff --git a/docs/feature_hd44780.md b/docs/feature_hd44780.md
index dc476c734f..4ade640baa 100644
--- a/docs/feature_hd44780.md
+++ b/docs/feature_hd44780.md
@@ -1,57 +1,298 @@
-# HD44780 LCD Displays
-
-This is an integration of Peter Fleury's LCD library. This page will explain the basics. [For in depth documentation visit his page.](http://www.peterfleury.epizy.com/doxygen/avr-gcc-libraries/group__pfleury__lcd.html)
-
-You can enable support for HD44780 Displays by setting the `HD44780_ENABLE` flag in your keyboards `rules.mk` to yes.
-
-## Configuration
-
-You will need to configure the pins used by your display, and its number of lines and columns in your keyboard's `config.h`.
-
-
-Uncomment the section labled HD44780 and change the parameters as needed.
-````
-/*
- * HD44780 LCD Display Configuration
- */
-
-#define LCD_LINES 2 //< number of visible lines of the display
-#define LCD_DISP_LENGTH 16 //< visibles characters per line of the display
-#define LCD_IO_MODE 1 //< 0: memory mapped mode, 1: IO port mode
-#if LCD_IO_MODE
-#define LCD_PORT PORTB //< port for the LCD lines
-#define LCD_DATA0_PORT LCD_PORT //< port for 4bit data bit 0
-#define LCD_DATA1_PORT LCD_PORT //< port for 4bit data bit 1
-#define LCD_DATA2_PORT LCD_PORT //< port for 4bit data bit 2
-#define LCD_DATA3_PORT LCD_PORT //< port for 4bit data bit 3
-#define LCD_DATA0_PIN 4 //< pin for 4bit data bit 0
-#define LCD_DATA1_PIN 5 //< pin for 4bit data bit 1
-#define LCD_DATA2_PIN 6 //< pin for 4bit data bit 2
-#define LCD_DATA3_PIN 7 //< pin for 4bit data bit 3
-#define LCD_RS_PORT LCD_PORT //< port for RS line
-#define LCD_RS_PIN 3 //< pin for RS line
-#define LCD_RW_PORT LCD_PORT //< port for RW line
-#define LCD_RW_PIN 2 //< pin for RW line
-#define LCD_E_PORT LCD_PORT //< port for Enable line
-#define LCD_E_PIN 1 //< pin for Enable line
-#endif
-````
-
-Should you need to configure other properties you can copy them from `quantum/hd44780.h` and set them in your `config.h`
+# HD44780 LCD Driver
+
+## Supported Hardware
+
+LCD modules using [HD44780U](https://www.sparkfun.com/datasheets/LCD/HD44780.pdf) IC or equivalent, communicating in 4-bit mode.
+
+|Module|Size |Notes |
+|------|--------------|---------------------------------|
+|1602A |16x2, 5x8 dots| |
+|2004A |20x4, 5x8 dots|Untested, not currently supported|
+
+To run these modules at 3.3V, an additional MAX660 voltage converter IC must be soldered on, along with two 10µF capacitors. See [this page](https://www.codrey.com/electronic-circuits/hack-your-16x2-lcd/) for more details.
## Usage
-To initialize your display, call `lcd_init()` with one of these parameters:
-````
-LCD_DISP_OFF : display off
-LCD_DISP_ON : display on, cursor off
-LCD_DISP_ON_CURSOR : display on, cursor on
-LCD_DISP_ON_CURSOR_BLINK : display on, cursor on flashing
-````
-This is best done in your keyboards `matrix_init_kb` or your keymaps `matrix_init_user`.
-It is advised to clear the display before use.
-To do so call `lcd_clrscr()`.
+Add the following to your `rules.mk`:
+
+```make
+HD44780_ENABLE = yes
+```
+
+## Basic Configuration
+
+Add the following to your `config.h`:
+
+|Define |Default |Description |
+|-----------------------|--------------|-----------------------------------------------------------------------------------------------------|
+|`HD44780_DATA_PINS` |*Not defined* |(Required) An array of four GPIO pins connected to the display's D4-D7 pins, eg. `{ B1, B3, B2, B6 }`|
+|`HD44780_RS_PIN` |*Not defined* |(Required) The GPIO connected to the display's RS pin |
+|`HD44780_RW_PIN` |*Not defined* |(Required) The GPIO connected to the display's RW pin |
+|`HD44780_E_PIN` |*Not defined* |(Required) The GPIO connected to the display's E pin |
+|`HD44780_DISPLAY_COLS` |`16` |The number of visible characters on a single line of the display |
+|`HD44780_DISPLAY_LINES`|`2` |The number of visible lines on the display |
+|`HD44780_WRAP_LINES` |*Not defined* |If defined, input characters will wrap to the next line |
+
+## Examples
+
+### Hello World
+
+Add the following to your `keymap.c`:
+
+```c
+void keyboard_post_init_user(void) {
+ hd44780_init(true, true); // Show blinking cursor
+ hd44780_puts_P(PSTR("Hello, world!\n"));
+}
+```
+
+### Custom Character Definition
+
+Up to eight custom characters can be defined. This data is stored in the Character Generator RAM (CGRAM), and is not persistent across power cycles.
+
+This example defines the QMK Psi as the first custom character. The first 16 positions in the character set are reserved for the eight custom characters duplicated.
+
+```
+Byte | 16 8 4 2 1
+ 1 | x x x ■ □ ■ □ ■
+ 2 | x x x ■ □ ■ □ ■
+ 3 | x x x ■ □ ■ □ ■
+ 4 | x x x □ ■ ■ ■ □
+ 5 | x x x □ □ ■ □ □
+ 6 | x x x □ □ ■ □ □
+ 7 | x x x □ □ ■ □ □
+ 8 | x x x □ □ □ □ □
+```
+
+```c
+const uint8_t PROGMEM psi[8] = { 0x15, 0x15, 0x15, 0x0E, 0x04, 0x04, 0x04, 0x00 };
+
+void keyboard_post_init_user(void) {
+ hd44780_init(false, false);
+ hd44780_define_char_P(0, psi);
+ // Cursor is incremented while defining characters so must be reset
+ hd44780_home();
+ // 0x08 to avoid null terminator
+ hd44780_puts_P(PSTR("\x08 QMK Firmware"));
+}
+```
+
+## API
+
+### `void hd44780_init(bool cursor, bool blink)`
+
+Initialize the display.
+
+This function should be called only once, before any of the other functions can be called.
+
+#### Arguments
+
+ - `bool cursor`
+ Whether to show the cursor.
+ - `bool blink`
+ Whether to blink the cursor, if shown.
+
+---
+
+### `void hd44780_clear(void)`
+
+Clear the display.
+
+This function is called on init.
+
+---
+
+### `void hd44780_home(void)`
+
+Move the cursor to the home position.
+
+This function is called on init.
+
+---
+
+### `void hd44780_on(bool cursor, bool blink)`
+
+Turn the display on, and/or set the cursor properties.
+
+This function is called on init.
+
+#### Arguments
+
+ - `bool cursor`
+ Whether to show the cursor.
+ - `bool blink`
+ Whether to blink the cursor, if shown.
+
+---
+
+### `void hd44780_off(void)`
+
+Turn the display off.
+
+---
+
+### `void hd44780_set_cursor(uint8_t col, uint8_t line)`
+
+Move the cursor to the specified position on the display.
+
+#### Arguments
+
+ - `uint8_t col`
+ The column number to move to, from 0 to 15 on 16x2 displays.
+ - `bool line`
+ The line number to move to, either 0 or 1 on 16x2 displays.
+
+---
+
+### `void hd44780_putc(char c)`
+
+Print a character to the display. The newline character `\n` will move the cursor to the start of the next line.
+
+The exact character shown may depend on the ROM code of your particular display - refer to the datasheet for the full character set.
+
+#### Arguments
+
+ - `char c`
+ The character to print.
+
+---
+
+### `void hd44780_puts(const char *s)`
+
+Print a string of characters to the display.
+
+#### Arguments
+
+ - `const char *s`
+ The string to print.
+
+---
+
+### `void hd44780_puts_P(const char *s)`
+
+Print a string of characters from PROGMEM to the display.
+
+On ARM devices, this function is simply an alias of `hd44780_puts()`.
+
+#### Arguments
+
+ - `const char *s`
+ The PROGMEM string to print (ie. `PSTR("Hello")`).
+
+---
+
+### `void hd44780_define_char(uint8_t index, uint8_t *data)`
+
+Define a custom character.
+
+#### Arguments
+
+ - `uint8_t index`
+ The index of the custom character to define, from 0 to 7.
+ - `uint8_t *data`
+ An array of 8 bytes containing the 5-bit row data of the character, where the first byte is the topmost row, and the least significant bit of each byte is the rightmost column.
+
+---
+
+### `void hd44780_define_char_P(uint8_t index, const uint8_t *data)`
+
+Define a custom character from PROGMEM.
+
+On ARM devices, this function is simply an alias of `hd44780_define_char()`.
+
+#### Arguments
+
+ - `uint8_t index`
+ The index of the custom character to define, from 0 to 7.
+ - `const uint8_t *data`
+ A PROGMEM array of 8 bytes containing the 5-bit row data of the character, where the first byte is the topmost row, and the least significant bit of each byte is the rightmost column.
+
+---
+
+### `bool hd44780_busy(void)`
+
+Indicates whether the display is currently processing, and cannot accept instructions.
+
+#### Return Value
+
+`true` if the display is busy.
+
+---
+
+### `void hd44780_write(uint8_t data, bool isData)`
+
+Write a byte to the display.
+
+#### Arguments
+
+ - `uint8_t data`
+ The byte to send to the display.
+ - `bool isData`
+ Whether the byte is an instruction or character data.
+
+---
+
+### `uint8_t hd44780_read(bool isData)`
+
+Read a byte from the display.
+
+#### Arguments
+
+ - `bool isData`
+ Whether to read the current cursor position, or the character at the cursor.
+
+#### Return Value
+
+If `isData` is `true`, the returned byte will be the character at the current DDRAM address. Otherwise, it will be the current DDRAM address and the busy flag.
+
+---
+
+### `void hd44780_command(uint8_t command)`
+
+Send a command to the display. Refer to the datasheet and `hd44780.h` for the valid commands and defines.
+
+This function waits for the display to clear the busy flag before sending the command.
+
+#### Arguments
+
+ - `uint8_t command`
+ The command to send.
+
+---
+
+### `void hd44780_data(uint8_t data)`
+
+Send a byte of data to the display.
+
+This function waits for the display to clear the busy flag before sending the data.
+
+#### Arguments
+
+ - `uint8_t data`
+ The byte of data to send.
+
+---
+
+### `void hd44780_set_cgram_address(uint8_t address)`
+
+Set the CGRAM address.
+
+This function is used when defining custom characters.
+
+#### Arguments
+
+ - `uint8_t address`
+ The CGRAM ad