/*
  cpu_map.h - CPU and pin mapping configuration file
  Part of Grbl

  Copyright (c) 2012-2015 Sungeun K. Jeon

  Grbl 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.

  Grbl 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 Grbl.  If not, see <http://www.gnu.org/licenses/>.
*/

/* The cpu_map.h files serve as a central pin mapping selection file for different 
   processor types or alternative pin layouts. This version of Grbl officially supports
   only the Arduino Mega328p. */


#ifndef cpu_map_h
#define cpu_map_h


#ifdef CPU_MAP_ATMEGA328P // (Arduino Uno) Officially supported by Grbl.

  // Define serial port pins and interrupt vectors.
  #define SERIAL_RX     USART_RX_vect
  #define SERIAL_UDRE   USART_UDRE_vect

  // Define step pulse output pins. NOTE: All step bit pins must be on the same port.
  #define STEP_DDR        DDRD
  #define STEP_PORT       PORTD
  #define X_STEP_BIT      2  // Uno Digital Pin 2
  #define Y_STEP_BIT      3  // Uno Digital Pin 3
  #define Z_STEP_BIT      4  // Uno Digital Pin 4
  #define STEP_MASK       ((1<<X_STEP_BIT)|(1<<Y_STEP_BIT)|(1<<Z_STEP_BIT)) // All step bits

  // Define step direction output pins. NOTE: All direction pins must be on the same port.
  #define DIRECTION_DDR     DDRD
  #define DIRECTION_PORT    PORTD
  #define X_DIRECTION_BIT   5  // Uno Digital Pin 5
  #define Y_DIRECTION_BIT   6  // Uno Digital Pin 6
  #define Z_DIRECTION_BIT   7  // Uno Digital Pin 7
  #define DIRECTION_MASK    ((1<<X_DIRECTION_BIT)|(1<<Y_DIRECTION_BIT)|(1<<Z_DIRECTION_BIT)) // All direction bits

  // Define stepper driver enable/disable output pin.
  #define STEPPERS_DISABLE_DDR    DDRB
  #define STEPPERS_DISABLE_PORT   PORTB
  #define STEPPERS_DISABLE_BIT    0  // Uno Digital Pin 8
  #define STEPPERS_DISABLE_MASK   (1<<STEPPERS_DISABLE_BIT)

  // Define homing/hard limit switch input pins and limit interrupt vectors. 
  // NOTE: All limit bit pins must be on the same port, but not on a port with other input pins (CONTROL).
  #define LIMIT_DDR        DDRB
  #define LIMIT_PIN        PINB
  #define LIMIT_PORT       PORTB
  #define X_LIMIT_BIT      1  // Uno Digital Pin 9
  #define Y_LIMIT_BIT      2  // Uno Digital Pin 10
  #ifdef VARIABLE_SPINDLE // Z Limit pin and spindle enabled swapped to access hardware PWM on Pin 11.  
    #define Z_LIMIT_BIT	   4 // Uno Digital Pin 12
  #else
    #define Z_LIMIT_BIT    3  // Uno Digital Pin 11
  #endif
  #define LIMIT_MASK       ((1<<X_LIMIT_BIT)|(1<<Y_LIMIT_BIT)|(1<<Z_LIMIT_BIT)) // All limit bits
  #define LIMIT_INT        PCIE0  // Pin change interrupt enable pin
  #define LIMIT_INT_vect   PCINT0_vect 
  #define LIMIT_PCMSK      PCMSK0 // Pin change interrupt register

  // Define spindle enable and spindle direction output pins.
  #define SPINDLE_ENABLE_DDR    DDRB
  #define SPINDLE_ENABLE_PORT   PORTB
  // Z Limit pin and spindle PWM/enable pin swapped to access hardware PWM on Pin 11.
  #ifdef VARIABLE_SPINDLE 
    #ifdef USE_SPINDLE_DIR_AS_ENABLE_PIN
      // If enabled, spindle direction pin now used as spindle enable, while PWM remains on D11.
      #define SPINDLE_ENABLE_BIT    5  // Uno Digital Pin 13 (NOTE: D13 can't be pulled-high input due to LED.)
    #else
      #define SPINDLE_ENABLE_BIT    3  // Uno Digital Pin 11
    #endif
  #else
    #define SPINDLE_ENABLE_BIT    4  // Uno Digital Pin 12
  #endif
  #ifndef USE_SPINDLE_DIR_AS_ENABLE_PIN
    #define SPINDLE_DIRECTION_DDR   DDRB
    #define SPINDLE_DIRECTION_PORT  PORTB
    #define SPINDLE_DIRECTION_BIT   5  // Uno Digital Pin 13 (NOTE: D13 can't be pulled-high input due to LED.)
  #endif
  
  // Define flood and mist coolant enable output pins.
  // NOTE: Uno analog pins 4 and 5 are reserved for an i2c interface, and may be installed at
  // a later date if flash and memory space allows.
  #define COOLANT_FLOOD_DDR   DDRC
  #define COOLANT_FLOOD_PORT  PORTC
  #define COOLANT_FLOOD_BIT   3  // Uno Analog Pin 3
  #ifdef ENABLE_M7 // Mist coolant disabled by default. See config.h to enable/disable.
    #define COOLANT_MIST_DDR   DDRC
    #define COOLANT_MIST_PORT  PORTC
    #define COOLANT_MIST_BIT   4 // Uno Analog Pin 4
  #endif  

  // Define user-control controls (cycle start, reset, feed hold) input pins.
  // NOTE: All CONTROLs pins must be on the same port and not on a port with other input pins (limits).
  #define CONTROL_DDR       DDRC
  #define CONTROL_PIN       PINC
  #define CONTROL_PORT      PORTC
  #define CONTROL_RESET_BIT         0  // Uno Analog Pin 0
  #define CONTROL_FEED_HOLD_BIT     1  // Uno Analog Pin 1
  #define CONTROL_CYCLE_START_BIT   2  // Uno Analog Pin 2
  #define CONTROL_SAFETY_DOOR_BIT   1  // Uno Analog Pin 1 NOTE: Safety door is shared with feed hold. Enabled by config define.
  #define CONTROL_INT       PCIE1  // Pin change interrupt enable pin
  #define CONTROL_INT_vect  PCINT1_vect
  #define CONTROL_PCMSK     PCMSK1 // Pin change interrupt register
  #define CONTROL_MASK      ((1<<CONTROL_RESET_BIT)|(1<<CONTROL_FEED_HOLD_BIT)|(1<<CONTROL_CYCLE_START_BIT)|(1<<CONTROL_SAFETY_DOOR_BIT))
  #define CONTROL_INVERT_MASK   CONTROL_MASK // May be re-defined to only invert certain control pins.
  
  // Define probe switch input pin.
  #define PROBE_DDR       DDRC
  #define PROBE_PIN       PINC
  #define PROBE_PORT      PORTC
  #define PROBE_BIT       5  // Uno Analog Pin 5
  #define PROBE_MASK      (1<<PROBE_BIT)

  // Start of PWM & Stepper Enabled Spindle
  #ifdef VARIABLE_SPINDLE
    // Advanced Configuration Below You should not need to touch these variables
    #define SPINDLE_PWM_MAX_VALUE     255.0 // Don't change. 328p fast PWM mode fixes top value as 255.
    #define SPINDLE_TCCRA_REGISTER	  TCCR2A
    #define SPINDLE_TCCRB_REGISTER	  TCCR2B
    #define SPINDLE_OCR_REGISTER      OCR2A
    #define SPINDLE_COMB_BIT	        COM2A1
  
    // 1/8 Prescaler, 8-bit Fast PWM mode. Translates to about 7.8kHz PWM frequency.
    #define SPINDLE_TCCRA_INIT_MASK   ((1<<WGM20) | (1<<WGM21))
    #define SPINDLE_TCCRB_INIT_MASK   (1<<CS21)
      
    // NOTE: On the 328p, these must be the same as the SPINDLE_ENABLE settings.
    #define SPINDLE_PWM_DDR	  DDRB
    #define SPINDLE_PWM_PORT  PORTB
    #define SPINDLE_PWM_BIT	  3    // Uno Digital Pin 11
  #endif // End of VARIABLE_SPINDLE

#endif

/* 
#ifdef CPU_MAP_CUSTOM_PROC
  // For a custom pin map or different processor, copy and edit one of the available cpu
  // map files and modify it to your needs. Make sure the defined name is also changed in
  // the config.h file.
#endif
*/

#endif