/*
  settings.h - eeprom configuration handling 
  Part of Grbl

  Copyright (c) 2011-2014 Sungeun K. Jeon
  Copyright (c) 2009-2011 Simen Svale Skogsrud
  
  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/>.
*/

#ifndef settings_h
#define settings_h

#include <math.h>
#include "nuts_bolts.h"

#define GRBL_VERSION "0.9b"
#define GRBL_VERSION_BUILD "20131210"

// Version of the EEPROM data. Will be used to migrate existing data from older versions of Grbl
// when firmware is upgraded. Always stored in byte 0 of eeprom
#define SETTINGS_VERSION 57

// Define bit flag masks for the boolean settings in settings.flag.
#define BITFLAG_REPORT_INCHES      bit(0)
#define BITFLAG_AUTO_START         bit(1)
#define BITFLAG_INVERT_ST_ENABLE   bit(2)
#define BITFLAG_HARD_LIMIT_ENABLE  bit(3)
#define BITFLAG_HOMING_ENABLE      bit(4)
#define BITFLAG_SOFT_LIMIT_ENABLE  bit(5)
#define BITFLAG_INVERT_LIMIT_PINS  bit(6)

// Define EEPROM memory address location values for Grbl settings and parameters
// NOTE: The Atmega328p has 1KB EEPROM. The upper half is reserved for parameters and
// the startup script. The lower half contains the global settings and space for future 
// developments.
#define EEPROM_ADDR_GLOBAL 1
#define EEPROM_ADDR_PARAMETERS 512
#define EEPROM_ADDR_STARTUP_BLOCK 768

// Define EEPROM address indexing for coordinate parameters
#define N_COORDINATE_SYSTEM 6  // Number of supported work coordinate systems (from index 1)
#define SETTING_INDEX_NCOORD N_COORDINATE_SYSTEM+1 // Total number of system stored (from index 0)
// NOTE: Work coordinate indices are (0=G54, 1=G55, ... , 6=G59)
#define SETTING_INDEX_G28    N_COORDINATE_SYSTEM    // Home position 1
#define SETTING_INDEX_G30    N_COORDINATE_SYSTEM+1  // Home position 2
// #define SETTING_INDEX_G92    N_COORDINATE_SYSTEM+2  // Coordinate offset (G92.2,G92.3 not supported)

// Global persistent settings (Stored from byte EEPROM_ADDR_GLOBAL onwards)
typedef struct {
  float steps_per_mm[N_AXIS];
  float max_rate[N_AXIS];
  float acceleration[N_AXIS];
  float max_travel[N_AXIS];
  uint8_t pulse_microseconds;
  float default_feed_rate;
  uint8_t step_invert_mask;
  uint8_t dir_invert_mask;
  uint8_t stepper_idle_lock_time; // If max value 255, steppers do not disable.
  float junction_deviation;
  float arc_tolerance;
  uint8_t decimal_places;
  uint8_t flags;  // Contains default boolean settings
  uint8_t homing_dir_mask;
  float homing_feed_rate;
  float homing_seek_rate;
  uint16_t homing_debounce_delay;
  float homing_pulloff;
//  uint8_t status_report_mask; // Mask to indicate desired report data.
} settings_t;
extern settings_t settings;

// Initialize the configuration subsystem (load settings from EEPROM)
void settings_init();

// A helper method to set new settings from command line
uint8_t settings_store_global_setting(int parameter, float value);

// Stores the protocol line variable as a startup line in EEPROM
void settings_store_startup_line(uint8_t n, char *line);

// Reads an EEPROM startup line to the protocol line variable
uint8_t settings_read_startup_line(uint8_t n, char *line);

// Writes selected coordinate data to EEPROM
void settings_write_coord_data(uint8_t coord_select, float *coord_data);

// Reads selected coordinate data from EEPROM
uint8_t settings_read_coord_data(uint8_t coord_select, float *coord_data);

#endif