qmk_firmware/keyboards/handwired/6key/config.h

 /* Copyright 2020 Bratzworth
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */

#pragma once


/* pin-out */
#define MATRIX_ROW_PINS { B4, D0 }
#define MATRIX_COL_PINS { D3, D2, D1 }

/* dip switch */
#define DIP_SWITCH_PINS { C6 }

/* COL2ROW or ROW2COL */
#define DIODE_DIRECTION COL2ROW