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@@ -51,3 +51,25 @@ In this way `OCRxx` essentially controls the duty cycle of the LEDs, and thus th
The breathing effect is achieved by registering an interrupt handler for `TIMER1_OVF_vect` that is called whenever the counter resets, roughly 244 times per second.
In this handler, the value of an incrementing counter is mapped onto a precomputed brightness curve. To turn off breathing, the interrupt handler is simply disabled, and the brightness reset to the level stored in EEPROM.
+
+## Backlight Functions
+
+|Function |Description |
+|----------|-----------------------------------------------------------|
+|`backlight_toggle()` |Turn the backlight on or off |
+|`backlight_enable()` |Turn the backlight on |
+|`backlight_disable()` |Turn the backlight off |
+|`backlight_step()` |Cycle through backlight levels |
+|`backlight_increase()` |Increase the backlight level |
+|`backlight_decrease()` |Decrease the backlight level |
+|`backlight_level(x)` |Sets the backlight level to specified level |
+|`get_backlight_level()` |Return the current backlight level |
+|`is_backlight_enabled()`|Return whether the backlight is currently on |
+
+### Backlight Breathing Functions
+
+|Function |Description |
+|----------|----------------------------------------------------------|
+|`breathing_toggle()` |Turn the backlight breathing on or off |
+|`breathing_enable()` |Turns on backlight breathing |
+|`breathing_disable()` |Turns off backlight breathing |