Table of contents
Charybdis features
1. Charybdis stock keymap
2. Firmware configuration

All the features listed below are available in the Charybdis stock keymaps (built from the via keymap source).

The stock keymap aims at providing a consistent experience out of the box. Because some features can be mutually exclusives (e.g. Auto sniping on layer and Auto pointer layer), not all features are enabled by default. It may be necessary to rebuild the firmware to enable or disable some of the features listed below.

Charybdis features

Charybdis stock keymap

The stock keymap is built off the via keymap:

A visual reference layout is provided for each of these keymap at the links above.

Those stock keymaps are compatible with Via which enables on-the-fly configuration to a certain extent (i.e. keycodes, rotary encoders, RGB animations can be configured in just a few clicks from the UI). Some more advanced features, however, require manually updating the firmware.

There’s 2 features that are related to pointing devices available in the Charybdis firmware:

Sniping: temporarily reduces the sensitivity of the pointer for a more precise control.
Drag-scroll: temporarily changes the behavior of the trackball into a scrolling device (in any direction).

DPI

DPI (i.e. dots per linear inch), a.k.a. mouse sensitivity, can be controlled by the firmware. The Charybdis keymap offers 2 different DPI settings:

Default DPI: the sensitivity of the pointer in normal (i.e. non-sniping) mode.
Sniping DPI: the sensitivity of the pointer in sniping mode.

For each mode, the firmware allows cycling through multiple pre-defined values:

Default mode:
- Default value: 400 DPI
- 16 steps available
- Increments of 200 DPI
- Total range from 400 to 3,400 (400 → 600 → 800 → … → 3,400)
Sniping mode:
- Default value: 200 DPI
- 4 steps available
- Increments of 100 DPI
- Total range from 200 to 500 (200 → 300 → 400 → 500)

The firmware cycles through these values, which means that, for example, incrementing the sniping DPI of 500 by 1 step will loop back to 200.

These values can be changed by manually editing the firmware. See [Dynamic DPI scaling](#changing-dynamic-dpi-scaling-default-and-increment-values].

Custom keycodes

The Charybdis firmware comes with a number of custom keycodes related to features that are specific to this keyboard. These keycodes are:

Default DPI Increase (DPI+): increase the sensitivity of the pointer movement by one step (out of 16).
Default DPI Decrease (DPI-): decrease the sensitivity of the pointer movement by one step (out of 16).
Sniping DPI Increase (Snp+): increase the sensitivity of the pointer movement in sniping mode by one step (out of 4).
Sniping DPI Decrease (Snp-): decrease the sensitivity of the pointer movement in sniping mode by one step (out of 4).
Sniping Momentary (Snp): enable sniping mode as long as the key is pressed.
Sniping Toggle (SnpT): toggle sniping mode on and off.
Drag-scroll Momentary (Drg): enable drag-scroll mode as long as the key is pressed.
Drag-scroll Toggle (DrgT): toggle drag-scroll mode on and off.