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18 lines
730 B
Markdown
18 lines
730 B
Markdown
# Overview
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When defining a [keymap](keymap.md) each key needs a valid key definition.
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This page documents the symbols that correspond to keycodes that are available to you in QMK.
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## Basic keycodes (`0x00` - `0xFF`)
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[Basic keycodes](basic_keycodes.md) in QMK are based on [HID Usage Keyboard/Keypad Page(0x07)](http://www.usb.org/developers/hidpage/Hut1_12v2.pdf) with following exceptions:
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* `KC_NO` = 0 for no action
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* `KC_TRNS` = 1 for layer transparency
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* internal special keycodes in the `0xA5-DF` range (tmk heritage).
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## Quantum keycodes (`0x0100` - `0xFFFF`)
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[Quantum keycodes](quantum_keycodes.md) allow for easier customisation of your keymap than the basic ones provide, without having to define custom actions.
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