eeprom.cpp

/* 
Copyright 2013 Brad Quick

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
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/>.
*/

#include <avr/eeprom.h>
#include "eeprom.h"
#include "multifly.h"

extern settingsstruct settings;
extern globalstruct global;

#define MAGICNUMBER 54321

void write_user_settings_to_eeprom() {
    int magicnumber=MAGICNUMBER;
    int size=sizeof(settingsstruct);
   
    eeprom_write_block((const void*)&magicnumber, (void*)0, sizeof(magicnumber));
    eeprom_write_block((const void*)&size, (void*)2, sizeof(size));
    eeprom_write_block((const void*)&settings, (void*)4, size);
}
   
void read_user_settings_from_eeprom() {
    int magicnumber=0;
    unsigned int size=0;
    eeprom_read_block((void*)&magicnumber, (void*)0, sizeof(magicnumber));

    if (magicnumber!=MAGICNUMBER) return;

    eeprom_read_block((void*)&size, (void*)2, sizeof(size));
    if (size>sizeof(settingsstruct)) size=sizeof(settingsstruct);
   
    eeprom_read_block((void*)&settings, (void*)4, size);
   
    global.userSettingsFromEeprom=1; // set a flag so the rest of the program know it's working with calibtated settings
}