text: /**
   * Marlin 3D Printer Firmware
   * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
   *
   * Based on Sprinter and grbl.
   * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
   *
   * 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 3 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/>.
   *
   */
  
  /**
   * This module is off by default, but can be enabled to facilitate the display of
   * extra debug information during code development. It assumes the existence of a
   * Max7219 LED Matrix. A suitable device can be obtained on eBay similar to this:
   * http://www.ebay.com/itm/191781645249 for under $2.00 including shipping.
   *
   * Just connect up +5v and GND to give it power, then connect up the pins assigned
   * in Configuration_adv.h. For example, on the Re-ARM you could use:
   *
   *   #define MAX7219_CLK_PIN   77
   *   #define MAX7219_DIN_PIN   78
   *   #define MAX7219_LOAD_PIN  79
   *
   * Max7219_init() is called automatically at startup, and then there are a number of
   * support functions available to control the LEDs in the 8x8 grid.
   *
   * void Max7219_init();
   * void Max7219_PutByte(uint8_t data);
   * void Max7219(uint8_t reg, uint8_t data);
   * void Max7219_LED_Set(uint8_t row, uint8_t col, bool on);
   * void Max7219_LED_On(uint8_t col, uint8_t row);
   * void Max7219_LED_Off(uint8_t col, uint8_t row);
   * void Max7219_LED_Toggle(uint8_t row, uint8_t col);
   * void Max7219_Clear_Row(uint8_t row);
   * void Max7219_Clear_Column(uint8_t col);
   * void Max7219_Set_Row(uint8_t row, uint8_t val);
   * void Max7219_Set_2_Rows(uint8_t row, uint16_t val);
   * void Max7219_Set_4_Rows(uint8_t row, uint32_t val);
   * void Max7219_Set_Column(uint8_t col, uint8_t val);
   * void Max7219_idle_tasks();
   */
  
  #ifndef __MAX7219_DEBUG_LEDS_H__
  #define __MAX7219_DEBUG_LEDS_H__
  
  //
  // define max7219 registers
  //
  #define max7219_reg_noop        0x00
  #define max7219_reg_digit0      0x01
  #define max7219_reg_digit1      0x02
  #define max7219_reg_digit2      0x03
  #define max7219_reg_digit3      0x04
  #define max7219_reg_digit4      0x05
  #define max7219_reg_digit5      0x06
  #define max7219_reg_digit6      0x07
  #define max7219_reg_digit7      0x08
  
  #define max7219_reg_intensity   0x0A
  #define max7219_reg_displayTest 0x0F
  #define max7219_reg_decodeMode  0x09
  #define max7219_reg_scanLimit   0x0B
  #define max7219_reg_shutdown    0x0C
  
  void Max7219_init();
  void Max7219_PutByte(uint8_t data);
  void Max7219(const uint8_t reg, const uint8_t data);
  void Max7219_LED_Set(const uint8_t row, const uint8_t col, const bool on);
  void Max7219_LED_On(const uint8_t row, const uint8_t col);
  void Max7219_LED_Off(const uint8_t row, const uint8_t col);
  void Max7219_LED_Toggle(const uint8_t row, const uint8_t col);
  void Max7219_Clear_Row(const uint8_t row);
  void Max7219_Clear_Column(const uint8_t col);
  void Max7219_Set_Row(const uint8_t row, const uint8_t val);
  void Max7219_Set_Column(const uint8_t col, const uint8_t val);
  void Max7219_idle_tasks();
  
  #endif // __MAX7219_DEBUG_LEDS_H__
  