85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
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/*
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E24C1024.cpp
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AT24C1024 Library for Arduino
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 US
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This library is based on several projects:
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The Arduino EEPROM library found here:
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http://arduino.cc/en/Reference/EEPROM
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The 24C256 library found here:
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http://www.arduino.cc/playground/Code/I2CEEPROM
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The 24C512 library found here:
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http://www.arduino.cc/playground/Code/I2CEEPROM24LC512
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Our project page is here:
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http://www.arduino.cc/playground/Code/I2CEEPROM24C1024
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From the datasheet:
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The AT24C1024B provides 1,048,576 bits of serial electrically
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erasable and programmable read only memory (EEPROM) organized
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as 131,072 words of 8 bits each. The device<EFBFBD>s cascadable
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feature allows up to four devices to share a common two-wire
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bus.
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http://www.atmel.com/dyn/resources/prod_documents/doc5194.pdf
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*/
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// Note: This is written for Arduino versions before 1.0. If you are using Arduino 1.0 and above
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// then you need to change Wire.Send to Wire.write and Wire.receive to Wire.read
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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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#endif
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#include <Wire.h>
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#include "E24C1024.h"
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E24C1024::E24C1024(void)
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{
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Wire.begin();
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}
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void E24C1024::write(unsigned long dataAddress, uint8_t data)
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{
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Wire.beginTransmission((uint8_t)((0x500000 | dataAddress) >> 16)); // B1010xxx
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Wire.write((uint8_t)((dataAddress & WORD_MASK) >> 8)); // MSB
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Wire.write((uint8_t)(dataAddress & 0xFF)); // LSB
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Wire.write(data);
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Wire.endTransmission();
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delay(5);
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}
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uint8_t E24C1024::read(unsigned long dataAddress)
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{
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uint8_t data = 0x00;
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Wire.beginTransmission((uint8_t)((0x500000 | dataAddress) >> 16)); // B1010xxx
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Wire.write((uint8_t)((dataAddress & WORD_MASK) >> 8)); // MSB
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Wire.write((uint8_t)(dataAddress & 0xFF)); // LSB
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Wire.endTransmission();
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Wire.requestFrom(0x50,1);
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if (Wire.available()) data = Wire.read();
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return data;
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}
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E24C1024 EEPROM1024;
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