109 lines
2.6 KiB
Markdown
109 lines
2.6 KiB
Markdown
# Custom Matrix
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QMK provides a mechanism to supplement or replace the default matrix scanning routine with your own code.
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The reasons to use this feature include:
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* Extra hardware between the keyboard's switches and MCU pins
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* I/O multiplexer
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* Line decoder
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* Irregular switch matrix
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* Simultaneous use of `COL2ROW` and `ROW2COL`
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## Prerequisites
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Implementing custom matrix usually involves compilation of an additional source file. It is recommended that for consistency, this file is called `matrix.c`.
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Add a new file to your keyboard directory:
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```
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keyboards/<keyboard>/matrix.c
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```
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And to configure compilation for the new file, add this to your `rules.mk`:
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```make
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SRC += matrix.c
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```
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## 'lite'
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Provides a default implementation for various scanning functions, reducing the boilerplate code when implementing custom matrix.
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To configure it, add this to your `rules.mk`:
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```make
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CUSTOM_MATRIX = lite
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```
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And implement the following functions in a `matrix.c` file in your keyboard folder:
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```c
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void matrix_init_custom(void) {
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// TODO: initialize hardware here
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}
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bool matrix_scan_custom(matrix_row_t current_matrix[]) {
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bool matrix_has_changed = false;
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// TODO: add matrix scanning routine here
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return matrix_has_changed;
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}
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```
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## Full Replacement
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When more control over the scanning routine is required, you can choose to implement the full scanning routine.
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To configure it, add this to your rules.mk:
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```make
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CUSTOM_MATRIX = yes
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```
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And implement the following functions in a `matrix.c` file in your keyboard folder:
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```c
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matrix_row_t matrix_get_row(uint8_t row) {
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// TODO: return the requested row data
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}
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void matrix_print(void) {
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// TODO: use print() to dump the current matrix state to console
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}
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void matrix_init(void) {
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// TODO: initialize hardware and global matrix state here
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// Unless hardware debouncing - Init the configured debounce routine
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debounce_init(MATRIX_ROWS);
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// This *must* be called for correct keyboard behavior
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matrix_init_kb();
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}
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uint8_t matrix_scan(void) {
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bool changed = false;
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// TODO: add matrix scanning routine here
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// Unless hardware debouncing - use the configured debounce routine
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changed = debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
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// This *must* be called for correct keyboard behavior
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matrix_scan_kb();
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return changed;
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}
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```
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And also provide defaults for the following callbacks:
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```c
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__attribute__((weak)) void matrix_init_kb(void) { matrix_init_user(); }
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__attribute__((weak)) void matrix_scan_kb(void) { matrix_scan_user(); }
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__attribute__((weak)) void matrix_init_user(void) {}
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__attribute__((weak)) void matrix_scan_user(void) {}
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```
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