qmk-firmware/keyboard/cluepad/cluepad.h

#ifndef CLUEPAD_H
#define CLUEPAD_H

#include "matrix.h"
#include "keymap.h"
#include <stddef.h>


/* Cluepad matrix layout
 * .-------------------.
 * |NLCK|   /|   *|   -|
 * |-------------------|
 * |   7|   8|   9|    |
 * |--------------|    |
 * |   4|   5|   6|   +|
 * |-------------------|
 * |   1|   2|   3|    |
 * |--------------|    |
 * |        0|   .| Ent|
 * '-------------------'
 */
// The first section contains all of the arguments
// The second converts the arguments into a two-dimensional array
#define KEYMAP( \
    k00, k01, k02, k03, \
    k10, k11, k12, k13, \
    k20, k21, k22, \
    k30, k31, k32, k33, \
    k40,      k42 \
) { \
    { k00, k01, k02, k03, }, \
    { k10, k11, k12, k13, }, \
    { k20, k21, k22, KC_NO, }, \
    { k30, k31, k32, k33, }, \
    { k40, KC_NO, k42, KC_NO } \
}

void matrix_init_user(void);
void matrix_scan_user(void);

#endif