zmk/app/src/matrix_transform.c

#include <zephyr.h>
#include <zmk/matrix_transform.h>
#include <zmk/matrix.h>
#include <dt-bindings/zmk/matrix-transform.h>

#ifdef ZMK_KEYMAP_TRANSFORM_NODE

#define _TRANSFORM_ENTRY(i, _) \
	[(KT_ROW(DT_PROP_BY_IDX(ZMK_KEYMAP_TRANSFORM_NODE, map, i)) * ZMK_MATRIX_COLS) + KT_COL(DT_PROP_BY_IDX(ZMK_KEYMAP_TRANSFORM_NODE, map, i))] = i,

static u32_t transform[] = 
    { UTIL_LISTIFY(ZMK_KEYMAP_LEN, _TRANSFORM_ENTRY, 0) };

#endif

u32_t zmk_matrix_transform_row_column_to_position(u32_t row, u32_t column)
{
    u32_t matrix_index;

#if DT_NODE_HAS_PROP(ZMK_KEYMAP_TRANSFORM_NODE, col_offset)
    column += DT_PROP(ZMK_KEYMAP_TRANSFORM_NODE, col_offset);
#endif

#if DT_NODE_HAS_PROP(ZMK_KEYMAP_TRANSFORM_NODE, row_offset)
    row += DT_PROP(ZMK_KEYMAP_TRANSFORM_NODE, row_offset);
#endif

    matrix_index = (row * ZMK_MATRIX_COLS) + column;

#ifdef ZMK_KEYMAP_TRANSFORM_NODE
    return transform[matrix_index];
#else
    return matrix_index;
#endif /* ZMK_KEYMAP_TRANSFORM_NODE */
};