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diff --git a/os/various/devices_lib/max7219.c b/os/various/devices_lib/max7219.c
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+/*
+    Pretty LAYer for ChibiOS/RT - Copyright (C) 2014 Rocco Marco Guglielmi
+
+    This file is part of PLAY for ChibiOS/RT.
+
+    PLAY 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 3 of the License, or
+    (at your option) any later version.
+
+    PLAY 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/>.
+*/
+
+/*
+    Special thanks to Giovanni Di Sirio for teachings, his moral support and
+    friendship. Note that some or every piece of this file could be part of
+    the ChibiOS project that is intellectual property of Giovanni Di Sirio.
+    Please refer to ChibiOS/RT license before use it.
+ */
+
+/**
+ * @file    max7219.c
+ * @brief   MAX7219 display driver module code.
+ *
+ * @addtogroup max7219
+ * @{
+ */
+
+#include "ch.h"
+#include "hal.h"
+
+#include "play.h"
+#include "max7219.h"
+
+#if (PLAY_USE_MAX7219) || defined (__DOXYGEN__)
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local variables and types.                                         */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   Reads a generic register value.
+ * @pre     The SPI interface must be initialized and the driver started.
+ *
+ * @param[in] spip      pointer to the SPI interface
+ * @param[in] adr       address number
+ * @param[in] data      data value.
+ */
+void max7219WriteRegister(SPIDriver *spip, uint16_t adr, uint8_t data) {
+
+  switch (adr) {
+    default:
+      return;
+    case MAX7219_AD_DIGIT_0:
+    case MAX7219_AD_DIGIT_1:
+    case MAX7219_AD_DIGIT_2:
+    case MAX7219_AD_DIGIT_3:
+    case MAX7219_AD_DIGIT_4:
+    case MAX7219_AD_DIGIT_5:
+    case MAX7219_AD_DIGIT_6:
+    case MAX7219_AD_DIGIT_7:
+    case MAX7219_AD_DECODE_MODE:
+    case MAX7219_AD_INTENSITY:
+    case MAX7219_AD_SCAN_LIMIT:
+    case MAX7219_AD_SHUTDOWN:
+    case MAX7219_AD_DISPLAY_TEST:
+      spiSelect(spip);
+      uint16_t txbuf = {adr | data};
+      spiSend(spip, 1, &txbuf);
+      spiUnselect(spip);
+  }
+}
+#endif /* PLAY_USE_MAX7219 */
+/** @} */