mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-10-03 18:09:02 -04:00
130 lines
4.2 KiB
C++
130 lines
4.2 KiB
C++
#pragma once
|
|
//
|
|
// FILE: I2C_eeprom.h
|
|
// AUTHOR: Rob Tillaart
|
|
// VERSION: 1.5.2
|
|
// PURPOSE: Arduino Library for external I2C EEPROM 24LC256 et al.
|
|
// URL: https://github.com/RobTillaart/I2C_EEPROM.git
|
|
//
|
|
// HISTORY: See I2C_eeprom.cpp
|
|
|
|
|
|
#include "Arduino.h"
|
|
#include "Wire.h"
|
|
|
|
|
|
#define I2C_EEPROM_VERSION (F("1.5.2"))
|
|
|
|
|
|
#define I2C_DEVICESIZE_24LC512 65536
|
|
#define I2C_DEVICESIZE_24LC256 32768
|
|
#define I2C_DEVICESIZE_24LC128 16384
|
|
#define I2C_DEVICESIZE_24LC64 8192
|
|
#define I2C_DEVICESIZE_24LC32 4096
|
|
#define I2C_DEVICESIZE_24LC16 2048
|
|
#define I2C_DEVICESIZE_24LC08 1024
|
|
#define I2C_DEVICESIZE_24LC04 512
|
|
#define I2C_DEVICESIZE_24LC02 256
|
|
#define I2C_DEVICESIZE_24LC01 128
|
|
|
|
|
|
#ifndef UNIT_TEST_FRIEND
|
|
#define UNIT_TEST_FRIEND
|
|
#endif
|
|
|
|
|
|
class I2C_eeprom
|
|
{
|
|
public:
|
|
/**
|
|
* Initializes the EEPROM with a default deviceSize of I2C_DEVICESIZE_24LC256 (32K EEPROM)
|
|
*/
|
|
I2C_eeprom(const uint8_t deviceAddress, TwoWire *wire = &Wire);
|
|
|
|
/**
|
|
* Initializes the EEPROM for the given device address.
|
|
*
|
|
* It will try to guess page size and address word size based on the size of the device.
|
|
*
|
|
* @param deviceAddress Byte address of the device.
|
|
* @param deviceSize Max size in bytes of the device (divide your device size in Kbits by 8)
|
|
* @param wire Select alternative Wire interface
|
|
*/
|
|
I2C_eeprom(const uint8_t deviceAddress, const uint32_t deviceSize, TwoWire *wire = &Wire);
|
|
|
|
#if defined (ESP8266) || defined(ESP32)
|
|
bool begin(uint8_t sda, uint8_t scl);
|
|
#endif
|
|
bool begin();
|
|
|
|
bool isConnected();
|
|
|
|
// writes a byte to memoryAddress
|
|
int writeByte(const uint16_t memoryAddress, const uint8_t value);
|
|
// writes length bytes from buffer to EEPROM
|
|
int writeBlock(const uint16_t memoryAddress, const uint8_t* buffer, const uint16_t length);
|
|
// set length bytes in the EEPROM to the same value.
|
|
int setBlock(const uint16_t memoryAddress, const uint8_t value, const uint16_t length);
|
|
|
|
|
|
// returns the value stored in memoryAddress
|
|
uint8_t readByte(const uint16_t memoryAddress);
|
|
// reads length bytes into buffer
|
|
uint16_t readBlock(const uint16_t memoryAddress, uint8_t* buffer, const uint16_t length);
|
|
|
|
|
|
// updates a byte at memoryAddress, writes only if there is a new value.
|
|
// return 0 if data is same or written OK, error code otherwise.
|
|
int updateByte(const uint16_t memoryAddress, const uint8_t value);
|
|
// updates a block in memory, writes only if there is a new value.
|
|
// only to be used when you expect to write same buffer multiple times.
|
|
// test your performance gains!
|
|
int updateBlock(const uint16_t memoryAddress, const uint8_t* buffer, const uint16_t length);
|
|
|
|
uint32_t determineSize(const bool debug = false);
|
|
|
|
uint32_t getDeviceSize() { return _deviceSize; };
|
|
uint8_t getPageSize() { return _pageSize; };
|
|
uint8_t getPageSize(uint32_t deviceSize);
|
|
uint32_t getLastWrite() { return _lastWrite; };
|
|
|
|
// TWR = WriteCycleTime
|
|
// 5 ms is minimum, one can add extra ms here to adjust timing of both read() and write()
|
|
void setExtraWriteCycleTime(uint8_t ms) { _extraTWR = ms; };
|
|
uint8_t getExtraWriteCycleTime() { return _extraTWR; };
|
|
|
|
private:
|
|
uint8_t _deviceAddress;
|
|
uint32_t _lastWrite; // for waitEEReady
|
|
uint32_t _deviceSize;
|
|
uint8_t _pageSize;
|
|
uint8_t _extraTWR = 0; // milliseconds
|
|
|
|
// 24LC32..24LC512 use two bytes for memory address
|
|
// 24LC01..24LC16 use one-byte addresses + part of device address
|
|
bool _isAddressSizeTwoWords;
|
|
|
|
|
|
/**
|
|
* Begins wire transmission and selects the given address to write/read.
|
|
*
|
|
* @param memoryAddress Address to write/read
|
|
*/
|
|
void _beginTransmission(const uint16_t memoryAddress);
|
|
|
|
int _pageBlock(const uint16_t memoryAddress, const uint8_t* buffer, const uint16_t length, const bool incrBuffer);
|
|
int _WriteBlock(const uint16_t memoryAddress, const uint8_t* buffer, const uint8_t length);
|
|
uint8_t _ReadBlock(const uint16_t memoryAddress, uint8_t* buffer, const uint8_t length);
|
|
|
|
// to optimize the write latency of the EEPROM
|
|
void _waitEEReady();
|
|
|
|
TwoWire * _wire;
|
|
|
|
UNIT_TEST_FRIEND;
|
|
};
|
|
|
|
|
|
// -- END OF FILE --
|
|
|