mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-09-20 00:55:58 -04:00
3a49ea46ba
+ improved buffer sizes + changed datatypes interface + refactor - removed eopAddr + improved testProgram Signed-off-by: Rob Tillaart <rob.tillaart@gmail.com>
150 lines
3.8 KiB
C++
150 lines
3.8 KiB
C++
//
|
|
// FILE: I2C_eeprom.cpp
|
|
// AUTHOR: Rob Tillaart
|
|
// VERSION: 1.0.02
|
|
// PURPOSE: Simple I2C_eeprom library for Arduino with EEPROM 24LC256 et al.
|
|
//
|
|
// HISTORY:
|
|
// 0.1.00 - 2011-01-21 initial version
|
|
// 0.1.01 - 2011-02-07 added setBlock function
|
|
// 0.2.00 - 2011-02-11 fixed 64 bit boundary bug
|
|
// 0.2.01 - 2011-08-13 _readBlock made more robust + return value
|
|
// 1.0.00 - 2013-06-09 support for Arduino 1.0.x
|
|
// 1.0.01 - 2013-11-01 fixed writeBlock bug, refactor
|
|
// 1.0.02 - 2013-11-03 optimize internal buffers, refactor
|
|
//
|
|
// Released to the public domain
|
|
//
|
|
|
|
#include <I2C_eeprom.h>
|
|
|
|
////////////////////////////////////////////////////////////////////
|
|
//
|
|
// PUBLIC
|
|
//
|
|
|
|
I2C_eeprom::I2C_eeprom(uint8_t device)
|
|
{
|
|
_deviceAddress = device;
|
|
Wire.begin();
|
|
//TWBR = 12; // 12 = 400Khz 72 = 100 FCPU/16+(2*TWBR)
|
|
}
|
|
|
|
|
|
void I2C_eeprom::writeByte(uint16_t address, uint8_t data)
|
|
{
|
|
_WriteBlock(address, &data, 1);
|
|
}
|
|
|
|
|
|
void I2C_eeprom::setBlock(uint16_t address, uint8_t data, uint16_t length)
|
|
{
|
|
uint8_t buffer[I2C_TWIBUFFERSIZE];
|
|
for (uint8_t i =0; i< I2C_TWIBUFFERSIZE; i++) buffer[i] = data;
|
|
|
|
_pageBlock(address, buffer, length, false);
|
|
}
|
|
|
|
|
|
void I2C_eeprom::writeBlock(uint16_t address, uint8_t* buffer, uint16_t length)
|
|
{
|
|
_pageBlock(address, buffer, length, true);
|
|
}
|
|
|
|
|
|
uint8_t I2C_eeprom::readByte(uint16_t address)
|
|
{
|
|
uint8_t rdata;
|
|
_ReadBlock(address, &rdata, 1); // todo check return value..
|
|
return rdata;
|
|
}
|
|
|
|
|
|
// maybe let's not read more than 30 or 32 uint8_ts at a time!
|
|
void I2C_eeprom::readBlock(uint16_t address, uint8_t* buffer, uint16_t length)
|
|
{
|
|
while (length > 0)
|
|
{
|
|
uint8_t cnt = min(length, I2C_TWIBUFFERSIZE);
|
|
_ReadBlock(address, buffer, cnt); // todo check return value..
|
|
address += cnt;
|
|
buffer += cnt;
|
|
length -= cnt;
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////
|
|
//
|
|
// PRIVATE
|
|
//
|
|
|
|
// _pageBlock aligns buffer to page boundaries for writing.
|
|
// and TWI buffer size
|
|
void I2C_eeprom::_pageBlock(uint16_t address, uint8_t* buffer, uint16_t length, bool incrBuffer)
|
|
{
|
|
while (length > 0)
|
|
{
|
|
uint8_t bytesUntilPageBoundary = I2C_EEPROM_PAGESIZE - address%I2C_EEPROM_PAGESIZE;
|
|
uint8_t cnt = min(length, bytesUntilPageBoundary);
|
|
cnt = min(cnt, I2C_TWIBUFFERSIZE);
|
|
|
|
_WriteBlock(address, buffer, cnt); // todo check return value..
|
|
address += cnt;
|
|
if (incrBuffer) buffer += cnt;
|
|
length -= cnt;
|
|
}
|
|
}
|
|
|
|
// pre: length <= I2C_EEPROM_PAGESIZE && length <= I2C_TWIBUFFERSIZE;
|
|
int I2C_eeprom::_WriteBlock(uint16_t address, uint8_t* buffer, uint8_t length)
|
|
{
|
|
Wire.beginTransmission(_deviceAddress);
|
|
#if defined(ARDUINO) && ARDUINO >= 100
|
|
Wire.write((int)(address >> 8));
|
|
Wire.write((int)(address & 0xFF));
|
|
for (uint8_t cnt = 0; cnt < length; cnt++)
|
|
Wire.write(buffer[cnt]);
|
|
#else
|
|
Wire.send((int)(address >> 8));
|
|
Wire.send((int)(address & 0xFF));
|
|
for (uint8_t cnt = 0; cnt < length; cnt++)
|
|
Wire.send(buffer[cnt]);
|
|
#endif
|
|
int rv = Wire.endTransmission();
|
|
|
|
delay(5);
|
|
return rv;
|
|
}
|
|
|
|
|
|
// pre: buffer is large enough to hold length bytes
|
|
int I2C_eeprom::_ReadBlock(uint16_t address, uint8_t* buffer, uint8_t length)
|
|
{
|
|
Wire.beginTransmission(_deviceAddress);
|
|
#if defined(ARDUINO) && ARDUINO >= 100
|
|
Wire.write((int)(address >> 8));
|
|
Wire.write((int)(address & 0xFF));
|
|
#else
|
|
Wire.send((int)(address >> 8));
|
|
Wire.send((int)(address & 0xFF));
|
|
#endif
|
|
Wire.endTransmission();
|
|
|
|
Wire.requestFrom(_deviceAddress, length);
|
|
int cnt = 0;
|
|
unsigned long before = millis();
|
|
while ((cnt < length) && ((millis() - before) < I2C_EEPROM_TIMEOUT))
|
|
{
|
|
#if defined(ARDUINO) && ARDUINO >= 100
|
|
if (Wire.available()) buffer[cnt++] = Wire.read();
|
|
#else
|
|
if (Wire.available()) buffer[cnt++] = Wire.receive();
|
|
#endif
|
|
}
|
|
return cnt;
|
|
}
|
|
|
|
|
|
//
|
|
// END OF FILE
|
|
//
|