mirror of https://github.com/zmkfirmware/zmk.git
66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
/*
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* Copyright (c) 2020 The ZMK Contributors
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*
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* SPDX-License-Identifier: MIT
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*/
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#include <zephyr/kernel.h>
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#include <zmk/matrix_transform.h>
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#include <zmk/matrix.h>
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#include <dt-bindings/zmk/matrix_transform.h>
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#ifdef ZMK_KEYMAP_TRANSFORM_NODE
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/* the transform in the device tree is a list of (row,column) pairs that is
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* indexed by by the keymap position of that key. We want to invert this in
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* order to be able to quickly determine what keymap position a particular
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* row,column pair is associated with, using a single lookup.
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*
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* We do this by creating the `transform` array at compile time, which is
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* indexed by (row * ZMK_MATRIX_COLS) + column, and the value contains an
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* encoded keymap index it is associated with. The keymap index is encoded
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* by adding INDEX_OFFSET to it, because not all row,column pairs have an
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* associated keymap index (some matrices are sparse), C globals are
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* initialized to 0, and the keymap index of 0 is a valid index. We want to
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* be able to detect the condition when an unassigned matrix position is
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* pressed and we want to return an error.
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*/
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#define INDEX_OFFSET 1
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#define TRANSFORM_ENTRY(i, _) \
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[(KT_ROW(DT_PROP_BY_IDX(ZMK_KEYMAP_TRANSFORM_NODE, map, i)) * ZMK_MATRIX_COLS) + \
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KT_COL(DT_PROP_BY_IDX(ZMK_KEYMAP_TRANSFORM_NODE, map, i))] = i + INDEX_OFFSET
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static uint32_t transform[] = {LISTIFY(ZMK_KEYMAP_LEN, TRANSFORM_ENTRY, (, ), 0)};
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#endif
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int32_t zmk_matrix_transform_row_column_to_position(uint32_t row, uint32_t column) {
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#if DT_NODE_HAS_PROP(ZMK_KEYMAP_TRANSFORM_NODE, col_offset)
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column += DT_PROP(ZMK_KEYMAP_TRANSFORM_NODE, col_offset);
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#endif
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#if DT_NODE_HAS_PROP(ZMK_KEYMAP_TRANSFORM_NODE, row_offset)
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row += DT_PROP(ZMK_KEYMAP_TRANSFORM_NODE, row_offset);
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#endif
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const uint32_t matrix_index = (row * ZMK_MATRIX_COLS) + column;
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#ifdef ZMK_KEYMAP_TRANSFORM_NODE
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if (matrix_index >= ARRAY_SIZE(transform)) {
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return -EINVAL;
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}
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const uint32_t value = transform[matrix_index];
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if (!value) {
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return -EINVAL;
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}
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return value - INDEX_OFFSET;
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#else
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return matrix_index;
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#endif /* ZMK_KEYMAP_TRANSFORM_NODE */
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};
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