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68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
#ifndef I2C_EEPROM_H
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#define I2C_EEPROM_H
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//
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// FILE: I2C_eeprom.h
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// AUTHOR: Rob Tillaart
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// PURPOSE: Simple I2C_eeprom library for Arduino with EEPROM 24LC256 et al.
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// VERSION: 1.0.05
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// HISTORY: See I2C_eeprom.cpp
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// URL: http://arduino.cc/playground/Main/LibraryForI2CEEPROM
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//
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// Released to the public domain
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//
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#include <Wire.h>
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#if defined(ARDUINO) && ARDUINO >= 100
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#include "Arduino.h"
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#else
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#include "WProgram.h"
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#include "Wstring.h"
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#include "Wiring.h"
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#endif
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#define I2C_EEPROM_VERSION "1.0.05"
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// I2C_EEPROM_PAGESIZE must be multiple of 2 e.g. 16, 32 or 64
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// 24LC256 -> 64 bytes
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#define I2C_EEPROM_PAGESIZE 64
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// TWI buffer needs max 2 bytes for address
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#define I2C_TWIBUFFERSIZE 30
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// to break blocking read/write
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#define I2C_EEPROM_TIMEOUT 1000
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// comment next line to keep lib small
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#define I2C_EEPROM_EXTENDED
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class I2C_eeprom
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{
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public:
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I2C_eeprom(uint8_t deviceAddress);
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int writeByte(uint16_t address, uint8_t value);
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int writeBlock(uint16_t address, uint8_t* buffer, uint16_t length);
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int setBlock(uint16_t address, uint8_t value, uint16_t length);
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uint8_t readByte(uint16_t address);
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uint16_t readBlock(uint16_t address, uint8_t* buffer, uint16_t length);
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#ifdef I2C_EEPROM_EXTENDED
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uint8_t determineSize();
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#endif
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private:
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uint8_t _deviceAddress;
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uint32_t _lastWrite; // for waitEEReady
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int _pageBlock(uint16_t address, uint8_t* buffer, uint16_t length, bool incrBuffer);
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int _WriteBlock(uint16_t address, uint8_t* buffer, uint8_t length);
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uint8_t _ReadBlock(uint16_t address, uint8_t* buffer, uint8_t length);
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void waitEEReady();
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};
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#endif
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// END OF FILE
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