mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-10-03 18:09:02 -04:00
496 lines
12 KiB
C++
496 lines
12 KiB
C++
//
|
|
// FILE: I2C_eeprom.cpp
|
|
// AUTHOR: Rob Tillaart
|
|
// VERSION: 1.7.1
|
|
// PURPOSE: Arduino Library for external I2C EEPROM 24LC256 et al.
|
|
// URL: https://github.com/RobTillaart/I2C_EEPROM.git
|
|
|
|
|
|
#include "I2C_eeprom.h"
|
|
|
|
|
|
// Not used directly
|
|
#define I2C_PAGESIZE_24LC512 128
|
|
#define I2C_PAGESIZE_24LC256 64
|
|
#define I2C_PAGESIZE_24LC128 64
|
|
#define I2C_PAGESIZE_24LC64 32
|
|
#define I2C_PAGESIZE_24LC32 32
|
|
#define I2C_PAGESIZE_24LC16 16
|
|
#define I2C_PAGESIZE_24LC08 16
|
|
#define I2C_PAGESIZE_24LC04 16
|
|
#define I2C_PAGESIZE_24LC02 8
|
|
#define I2C_PAGESIZE_24LC01 8
|
|
|
|
|
|
// I2C buffer needs max 2 bytes for EEPROM address
|
|
// 1 byte for EEPROM register address is available in transmit buffer
|
|
#if defined(ESP32) || defined(ESP8266)
|
|
#define I2C_BUFFERSIZE 128
|
|
#else
|
|
#define I2C_BUFFERSIZE 30 // AVR, STM
|
|
#endif
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////
|
|
//
|
|
// PUBLIC FUNCTIONS
|
|
//
|
|
I2C_eeprom::I2C_eeprom(const uint8_t deviceAddress, TwoWire * wire) :
|
|
I2C_eeprom(deviceAddress, I2C_PAGESIZE_24LC256, wire)
|
|
{
|
|
}
|
|
|
|
|
|
I2C_eeprom::I2C_eeprom(const uint8_t deviceAddress, const uint32_t deviceSize, TwoWire * wire)
|
|
{
|
|
_deviceAddress = deviceAddress;
|
|
_deviceSize = setDeviceSize(deviceSize);
|
|
_pageSize = getPageSize(_deviceSize);
|
|
_wire = wire;
|
|
|
|
// Chips 16 Kbit (2048 Bytes) or smaller only have one-word addresses.
|
|
this->_isAddressSizeTwoWords = deviceSize > I2C_DEVICESIZE_24LC16;
|
|
}
|
|
|
|
|
|
#if defined (ESP8266) || defined(ESP32)
|
|
bool I2C_eeprom::begin(uint8_t sda, uint8_t scl)
|
|
{
|
|
// if (_wire == 0) Serial.println("zero"); // test #48
|
|
if ((sda < 255) && (scl < 255))
|
|
{
|
|
_wire->begin(sda, scl);
|
|
}
|
|
else
|
|
{
|
|
_wire->begin();
|
|
}
|
|
_lastWrite = 0;
|
|
return isConnected();
|
|
}
|
|
#endif
|
|
|
|
|
|
bool I2C_eeprom::begin()
|
|
{
|
|
// if (_wire == 0) Serial.println("zero"); // test #48
|
|
_wire->begin();
|
|
_lastWrite = 0;
|
|
return isConnected();
|
|
}
|
|
|
|
|
|
bool I2C_eeprom::isConnected()
|
|
{
|
|
_wire->beginTransmission(_deviceAddress);
|
|
return (_wire->endTransmission() == 0);
|
|
}
|
|
|
|
|
|
/////////////////////////////////////////////////////////////
|
|
//
|
|
// WRITE SECTION
|
|
//
|
|
|
|
// returns I2C status, 0 = OK
|
|
int I2C_eeprom::writeByte(const uint16_t memoryAddress, const uint8_t data)
|
|
{
|
|
int rv = _WriteBlock(memoryAddress, &data, 1);
|
|
return rv;
|
|
}
|
|
|
|
|
|
// returns I2C status, 0 = OK
|
|
int I2C_eeprom::setBlock(const uint16_t memoryAddress, const uint8_t data, const uint16_t length)
|
|
{
|
|
uint8_t buffer[I2C_BUFFERSIZE];
|
|
for (uint8_t i = 0; i < I2C_BUFFERSIZE; i++)
|
|
{
|
|
buffer[i] = data;
|
|
}
|
|
int rv = _pageBlock(memoryAddress, buffer, length, false);
|
|
return rv;
|
|
}
|
|
|
|
|
|
// returns I2C status, 0 = OK
|
|
int I2C_eeprom::writeBlock(const uint16_t memoryAddress, const uint8_t * buffer, const uint16_t length)
|
|
{
|
|
int rv = _pageBlock(memoryAddress, buffer, length, true);
|
|
return rv;
|
|
}
|
|
|
|
|
|
/////////////////////////////////////////////////////////////
|
|
//
|
|
// READ SECTION
|
|
//
|
|
|
|
// returns the value stored in memoryAddress
|
|
uint8_t I2C_eeprom::readByte(const uint16_t memoryAddress)
|
|
{
|
|
uint8_t rdata;
|
|
_ReadBlock(memoryAddress, &rdata, 1);
|
|
return rdata;
|
|
}
|
|
|
|
|
|
// returns bytes read.
|
|
uint16_t I2C_eeprom::readBlock(const uint16_t memoryAddress, uint8_t * buffer, const uint16_t length)
|
|
{
|
|
uint16_t addr = memoryAddress;
|
|
uint16_t len = length;
|
|
uint16_t rv = 0;
|
|
while (len > 0)
|
|
{
|
|
uint8_t cnt = I2C_BUFFERSIZE;
|
|
if (cnt > len) cnt = len;
|
|
rv += _ReadBlock(addr, buffer, cnt);
|
|
addr += cnt;
|
|
buffer += cnt;
|
|
len -= cnt;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
|
|
/////////////////////////////////////////////////////////////
|
|
//
|
|
// UPDATE SECTION
|
|
//
|
|
|
|
// returns 0 == OK
|
|
int I2C_eeprom::updateByte(const uint16_t memoryAddress, const uint8_t data)
|
|
{
|
|
if (data == readByte(memoryAddress)) return 0;
|
|
return writeByte(memoryAddress, data);
|
|
}
|
|
|
|
|
|
// returns bytes written.
|
|
uint16_t I2C_eeprom::updateBlock(const uint16_t memoryAddress, const uint8_t * buffer, const uint16_t length)
|
|
{
|
|
uint16_t addr = memoryAddress;
|
|
uint16_t len = length;
|
|
uint16_t rv = 0;
|
|
while (len > 0)
|
|
{
|
|
uint8_t buf[I2C_BUFFERSIZE];
|
|
uint8_t cnt = I2C_BUFFERSIZE;
|
|
|
|
if (cnt > len) cnt = len;
|
|
rv += _ReadBlock(addr, buf, cnt);
|
|
if (memcmp(buffer, buf, cnt) != 0)
|
|
{
|
|
_pageBlock(addr, buffer, cnt, true);
|
|
}
|
|
addr += cnt;
|
|
buffer += cnt;
|
|
len -= cnt;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
|
|
/////////////////////////////////////////////////////////////
|
|
//
|
|
// VERIFY SECTION
|
|
//
|
|
|
|
// return false if write or verify failed.
|
|
bool I2C_eeprom::writeByteVerify(const uint16_t memoryAddress, const uint8_t value)
|
|
{
|
|
if (writeByte(memoryAddress, value) != 0 ) return false;
|
|
uint8_t data = readByte(memoryAddress);
|
|
return (data == value);
|
|
}
|
|
|
|
|
|
// return false if write or verify failed.
|
|
bool I2C_eeprom::writeBlockVerify(const uint16_t memoryAddress, const uint8_t * buffer, const uint16_t length)
|
|
{
|
|
if (writeBlock(memoryAddress, buffer, length) != 0) return false;
|
|
uint8_t data[length];
|
|
if (readBlock(memoryAddress, data, length) != length) return false;
|
|
return memcmp(data, buffer, length) == 0;
|
|
}
|
|
|
|
|
|
// return false if write or verify failed.
|
|
bool I2C_eeprom::setBlockVerify(const uint16_t memoryAddress, const uint8_t value, const uint16_t length)
|
|
{
|
|
if (setBlock(memoryAddress, value, length) != 0) return false;
|
|
uint8_t data[length];
|
|
if (readBlock(memoryAddress, data, length) != length) return false;
|
|
for (uint16_t i = 0; i < length; i++)
|
|
{
|
|
if (data[i] != value) return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
// return false if write or verify failed.
|
|
bool I2C_eeprom::updateByteVerify(const uint16_t memoryAddress, const uint8_t value)
|
|
{
|
|
if (updateByte(memoryAddress, value) != 0 ) return false;
|
|
uint8_t data = readByte(memoryAddress);
|
|
return (data == value);
|
|
}
|
|
|
|
|
|
// return false if write or verify failed.
|
|
bool I2C_eeprom::updateBlockVerify(const uint16_t memoryAddress, const uint8_t * buffer, const uint16_t length)
|
|
{
|
|
if (updateBlock(memoryAddress, buffer, length) != length) return false;
|
|
uint8_t data[length];
|
|
if (readBlock(memoryAddress, data, length) != length) return false;
|
|
return memcmp(data, buffer, length) == 0;
|
|
}
|
|
|
|
/////////////////////////////////////////////////////////////
|
|
//
|
|
// METADATA SECTION
|
|
//
|
|
|
|
// returns size in bytes
|
|
// returns 0 if not connected
|
|
//
|
|
// tested for
|
|
// 2 byte address
|
|
// 24LC512 64 KB YES
|
|
// 24LC256 32 KB YES
|
|
// 24LC128 16 KB YES
|
|
// 24LC64 8 KB YES
|
|
// 24LC32 4 KB YES* - no hardware test, address scheme identical to 24LC64.
|
|
//
|
|
// 1 byte address (uses part of deviceAddress byte)
|
|
// 24LC16 2 KB YES
|
|
// 24LC08 1 KB YES
|
|
// 24LC04 512 B YES
|
|
// 24LC02 256 B YES
|
|
// 24LC01 128 B YES
|
|
uint32_t I2C_eeprom::determineSize(const bool debug)
|
|
{
|
|
// try to read a byte to see if connected
|
|
if (! isConnected()) return 0;
|
|
|
|
uint8_t patAA = 0xAA;
|
|
uint8_t pat55 = 0x55;
|
|
|
|
for (uint32_t size = 128; size <= 65536; size *= 2)
|
|
{
|
|
bool folded = false;
|
|
|
|
// store old values
|
|
bool addressSize = _isAddressSizeTwoWords;
|
|
_isAddressSizeTwoWords = size > I2C_DEVICESIZE_24LC16; // 2048
|
|
uint8_t buf = readByte(size);
|
|
|
|
// test folding
|
|
uint8_t cnt = 0;
|
|
writeByte(size, pat55);
|
|
if (readByte(0) == pat55) cnt++;
|
|
writeByte(size, patAA);
|
|
if (readByte(0) == patAA) cnt++;
|
|
folded = (cnt == 2);
|
|
if (debug)
|
|
{
|
|
Serial.print(size, HEX);
|
|
Serial.print('\t');
|
|
Serial.println(readByte(size), HEX);
|
|
}
|
|
|
|
// restore old values
|
|
writeByte(size, buf);
|
|
_isAddressSizeTwoWords = addressSize;
|
|
|
|
if (folded) return size;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
uint8_t I2C_eeprom::getPageSize(uint32_t deviceSize)
|
|
{
|
|
// determine page size from device size
|
|
// based on Microchip 24LCXX data sheets.
|
|
if (deviceSize <= I2C_DEVICESIZE_24LC02) return 8;
|
|
if (deviceSize <= I2C_DEVICESIZE_24LC16) return 16;
|
|
if (deviceSize <= I2C_DEVICESIZE_24LC64) return 32;
|
|
if (deviceSize <= I2C_DEVICESIZE_24LC256) return 64;
|
|
// I2C_DEVICESIZE_24LC512
|
|
return 128;
|
|
}
|
|
|
|
|
|
uint32_t I2C_eeprom::setDeviceSize(uint32_t deviceSize)
|
|
{
|
|
uint32_t size = 128;
|
|
// force power of 2.
|
|
while ((size <= 65536) && ( size <= deviceSize))
|
|
{
|
|
_deviceSize = size;
|
|
size *= 2;
|
|
}
|
|
// Chips 16 Kbit (2048 Bytes) or smaller only have one-word addresses.
|
|
this->_isAddressSizeTwoWords = _deviceSize > I2C_DEVICESIZE_24LC16;
|
|
return _deviceSize;
|
|
}
|
|
|
|
|
|
uint8_t I2C_eeprom::setPageSize(uint8_t pageSize)
|
|
{
|
|
uint8_t size = 8;
|
|
// force power of 2.
|
|
while ((size <= 128) && ( size <= pageSize))
|
|
{
|
|
_pageSize = size;
|
|
size *= 2;
|
|
}
|
|
return _pageSize;
|
|
}
|
|
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////
|
|
//
|
|
// PRIVATE
|
|
//
|
|
|
|
// _pageBlock aligns buffer to page boundaries for writing.
|
|
// and to I2C buffer size
|
|
// returns 0 = OK otherwise error
|
|
int I2C_eeprom::_pageBlock(const uint16_t memoryAddress, const uint8_t * buffer, const uint16_t length, const bool incrBuffer)
|
|
{
|
|
uint16_t addr = memoryAddress;
|
|
uint16_t len = length;
|
|
while (len > 0)
|
|
{
|
|
uint8_t bytesUntilPageBoundary = this->_pageSize - addr % this->_pageSize;
|
|
|
|
uint8_t cnt = I2C_BUFFERSIZE;
|
|
if (cnt > len) cnt = len;
|
|
if (cnt > bytesUntilPageBoundary) cnt = bytesUntilPageBoundary;
|
|
|
|
int rv = _WriteBlock(addr, buffer, cnt);
|
|
if (rv != 0) return rv;
|
|
|
|
addr += cnt;
|
|
if (incrBuffer) buffer += cnt;
|
|
len -= cnt;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
// supports one and two bytes addresses
|
|
void I2C_eeprom::_beginTransmission(const uint16_t memoryAddress)
|
|
{
|
|
if (this->_isAddressSizeTwoWords)
|
|
{
|
|
_wire->beginTransmission(_deviceAddress);
|
|
// Address High Byte
|
|
_wire->write((memoryAddress >> 8));
|
|
}
|
|
else
|
|
{
|
|
uint8_t addr = _deviceAddress | ((memoryAddress >> 8) & 0x07);
|
|
_wire->beginTransmission(addr);
|
|
}
|
|
|
|
// Address Low Byte (or single byte for chips 16K or smaller that have one-word addresses)
|
|
_wire->write((memoryAddress & 0xFF));
|
|
}
|
|
|
|
|
|
// pre: length <= this->_pageSize && length <= I2C_BUFFERSIZE;
|
|
// returns 0 = OK otherwise error
|
|
int I2C_eeprom::_WriteBlock(const uint16_t memoryAddress, const uint8_t * buffer, const uint8_t length)
|
|
{
|
|
_waitEEReady();
|
|
|
|
this->_beginTransmission(memoryAddress);
|
|
_wire->write(buffer, length);
|
|
int rv = _wire->endTransmission();
|
|
_lastWrite = micros();
|
|
|
|
yield(); // For OS scheduling
|
|
|
|
// if (rv != 0)
|
|
// {
|
|
// if (_debug)
|
|
// {
|
|
// Serial.print("mem addr w: ");
|
|
// Serial.print(memoryAddress, HEX);
|
|
// Serial.print("\t");
|
|
// Serial.println(rv);
|
|
// }
|
|
// return -(abs(rv)); // error
|
|
// }
|
|
return rv;
|
|
}
|
|
|
|
|
|
// pre: buffer is large enough to hold length bytes
|
|
// returns bytes read
|
|
uint8_t I2C_eeprom::_ReadBlock(const uint16_t memoryAddress, uint8_t * buffer, const uint8_t length)
|
|
{
|
|
_waitEEReady();
|
|
|
|
this->_beginTransmission(memoryAddress);
|
|
int rv = _wire->endTransmission();
|
|
if (rv != 0)
|
|
{
|
|
// if (_debug)
|
|
// {
|
|
// Serial.print("mem addr r: ");
|
|
// Serial.print(memoryAddress, HEX);
|
|
// Serial.print("\t");
|
|
// Serial.println(rv);
|
|
// }
|
|
return 0; // error
|
|
}
|
|
|
|
// readBytes will always be equal or smaller to length
|
|
uint8_t readBytes = 0;
|
|
if (this->_isAddressSizeTwoWords)
|
|
{
|
|
readBytes = _wire->requestFrom(_deviceAddress, length);
|
|
}
|
|
else
|
|
{
|
|
uint8_t addr = _deviceAddress | ((memoryAddress >> 8) & 0x07);
|
|
readBytes = _wire->requestFrom(addr, length);
|
|
}
|
|
yield(); // For OS scheduling
|
|
uint8_t cnt = 0;
|
|
while (cnt < readBytes)
|
|
{
|
|
buffer[cnt++] = _wire->read();
|
|
}
|
|
return readBytes;
|
|
}
|
|
|
|
|
|
void I2C_eeprom::_waitEEReady()
|
|
{
|
|
#define I2C_WRITEDELAY 5000
|
|
// Wait until EEPROM gives ACK again.
|
|
// this is a bit faster than the hardcoded 5 milliSeconds
|
|
// TWR = WriteCycleTime
|
|
uint32_t waitTime = I2C_WRITEDELAY + _extraTWR * 1000UL; // do the math once.
|
|
while ((micros() - _lastWrite) <= waitTime)
|
|
{
|
|
_wire->beginTransmission(_deviceAddress);
|
|
int x = _wire->endTransmission();
|
|
if (x == 0) return;
|
|
yield(); // For OS scheduling
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
// -- END OF FILE --
|
|
|