m0EEPROM.h

// m0EEPROM.h - definitions for 24LC256 EEPROM read and write for m0 SAMD21G18 and adafruit feather
/*  The test code has a bunch of examples of usage.  
*
*   Note that when using multibyte reads or writes, both the SERIAL_BUFFER_SIZE and the PAGE_SIZE are 
*   _assumed_ to be powers of 2.
*/
#ifndef M0EEPROM_H
#define M0EEPROM_H

#include "Wire.h"

class eeprom {
    int _device_address; // chip address.  currently only supporting one
public:
    void begin(int device_address=0x50)
    {
        _device_address = device_address;
        Wire.begin();
    }

    // read a byte from the specified address in eeprom memory
    uint8_t read_byte(uint16_t address);

    // write a single byte of data to the given address in eeprom memory
    void write_byte(uint16_t address, uint8_t value);

    // read a structure of arbitrary size from address.
    // the size of the structure must be less than 64K-address.
    // returns a byte array of memory specified.  The byte array data
    // must be preallocated to the expected size.
    uint8_t* read_bytes(uint16_t address, uint8_t* data, uint16_t size);

    //  write a structure of arbitrary size to memory at address.
    //  the size of the structure must be less than 64K-address.
    //  The structure is passed as a byte array.
    void write_bytes(uint16_t address, uint8_t* data, uint16_t size);
};

extern eeprom Eeprom;

#endif // M0EEPROM_H