qmk-firmware/keyboards/maxipad/maxipad.h

#ifndef MAXIPAD_H
#define MAXIPAD_H

#include "quantum.h"

// This a shortcut to help you visually see your layout.
// The following is an example using the Planck MIT layout
// The first section contains all of the arguements
// The second converts the arguments into a two-dimensional array
#define KEYMAP( \
    k00, k01, k02, k03, k04, k05, \
    k10, k11, k12, k13, k14, k15, \
    k20, k21, k22, k23, k24, k25, \
    k30, k31, k32, k33, k34, k35, \
    k40, k41, k42, k43, k44, k45 \
) \
{ \
    { k00, k01, k02, k03, k04, k05 }, \
    { k10, k11, k12, k13, k14, k15 }, \
    { k20, k21, k22, k23, k24, k25 }, \
    { k30, k31, k32, k33, k34, k35 }, \
    { k40, k41, k42, k43, k44, k45 } \
}

#endif