MicroMDAEPiano/EEPROMAnything.h

/*
   MicroMDAEPiano

   MicroMDAEPiano is a port of the MDA-EPiano sound engine
   (https://sourceforge.net/projects/mda-vst/) for the Teensy-3.5/3.6 with audio shield.

   (c)2019-2020 H. Wirtz <wirtz@parasitstudio.de>

   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, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
*/

// Idea from: https://playground.arduino.cc/Code/EEPROMWriteAnything/

#include <EEPROM.h>
#include <Arduino.h>  // for type definitions

uint32_t crc32(uint8_t* calc_start, uint16_t calc_bytes);

template <class T> int EEPROM_writeAnything(int ee, const T& value)
{
  uint8_t* p = (uint8_t*)(const void*)&value;
  uint16_t i;
  uint32_t checksum = crc32(p + 4, sizeof(value) - 4);

  *p = checksum;

  for (i = 0; i < sizeof(value); i++)
    EEPROM.update(ee++, *p++);
  return i;
}

template <class T> int EEPROM_readAnything(int ee, T& value)
{
  uint8_t* p = (uint8_t*)(void*)&value;
  unsigned int i;
  for (i = 0; i < sizeof(value); i++)
    *p++ = EEPROM.read(ee++);
  return i;
}