qmk-firmware/docs/feature_swap_hands.md

Swap-Hands Action

The swap-hands action allows support for one-handed typing without requiring a separate layer. Set SWAP_HANDS_ENABLE in the Makefile and define a hand_swap_config entry in your keymap. Now whenever the ACTION_SWAP_HANDS command key is pressed the keyboard is mirrored. For instance, to type "Hello, World" on QWERTY you would type ^Ge^s^s^w^c W^wr^sd

Configuration

The configuration table is a simple 2-dimensional array to map from column/row to new column/row. Example hand_swap_config for Planck:

const keypos_t PROGMEM hand_swap_config[MATRIX_ROWS][MATRIX_COLS] = {
  {{11, 0}, {10, 0}, {9, 0}, {8, 0}, {7, 0}, {6, 0}, {5, 0}, {4, 0}, {3, 0}, {2, 0}, {1, 0}, {0, 0}},
  {{11, 1}, {10, 1}, {9, 1}, {8, 1}, {7, 1}, {6, 1}, {5, 1}, {4, 1}, {3, 1}, {2, 1}, {1, 1}, {0, 1}},
  {{11, 2}, {10, 2}, {9, 2}, {8, 2}, {7, 2}, {6, 2}, {5, 2}, {4, 2}, {3, 2}, {2, 2}, {1, 2}, {0, 2}},
  {{11, 3}, {10, 3}, {9, 3}, {8, 3}, {7, 3}, {6, 3}, {5, 3}, {4, 3}, {3, 3}, {2, 3}, {1, 3}, {0, 3}},
};

Note that the array indices are reversed same as the matrix and the values are of type keypos_t which is {col, row} and all values are zero-based. In the example above, hand_swap_config[2][4] (third row, fifth column) would return {7, 2} (third row, eighth column). Yes, this is confusing.

Swap Keycodes

Key	Aliases	Description
SH_T(kc)		Momentary swap when held, kc when tapped
QK_SWAP_HANDS_ON	SH_ON	Turn on hand swap
QK_SWAP_HANDS_OFF	SH_OFF	Turn off hand swap
QK_SWAP_HANDS_MOMENTARY_ON	SH_MON	Turn on hand swap while held
QK_SWAP_HANDS_MOMENTARY_OFF	SH_MOFF	Turn off hand swap while held
QK_SWAP_HANDS_TOGGLE	SH_TOGG	Toggle hand swap
QK_SWAP_HANDS_TAP_TOGGLE	SH_TT	Momentary swap when held, toggle when tapped
QK_SWAP_HANDS_ONE_SHOT	SH_OS	Turn on hand swap while held or until next key press

SH_TT swap-hands tap-toggle key is similar to layer tap-toggle. Tapping repeatedly (5 taps by default) will toggle swap-hands on or off, like SH_TOGG. Tap-toggle count can be changed by defining a value for TAPPING_TOGGLE.

Encoder Mapping

When using an encoder mapping, it's also able to handle swapping encoders between sides, too.

Encoder indexes are defined as left-to-right, and the extent of the array needs to match the number of encoders on the keyboard.

As an example, if a split keyboard has a single encoder per side, you can swap the order by using the following code in your keymap:

#if defined(SWAP_HANDS_ENABLE) && defined(ENCODER_MAP_ENABLE)
const uint8_t PROGMEM encoder_hand_swap_config[NUM_ENCODERS] = { 1, 0 };
#endif