In this turorial we will see how we can easily interface a 24C series serial EEPROM with AVR microcontrollers. What is an EEPROM? An EEPROM is kinds of novalatile memory, that means it is used for storing digital data permanently without any power suply. EEPROM stands for Electrically Erasable Programmable Read Only Memory.
The advantage of these kind of ROMs is that they can be erased Electrically to make them ready for storing new data. Compare this with a CD R disks they can be recorded only once. A small amount of EEPROM is also available internally on the AVR chips. So if the volume of data you want to store is small (say few user names and password) then you can use it. The internal eeprom makes design small and simple.
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But if the amount of data you want to store is large, say in order of few tens of kilobytes then you have to interface a External EEPROM chip with your AVR MCU. You can store pictures, sound and long texts in these eeproms. Their are many kinds of EEPROM chip available from many manufactures. One very common family is 24C series serial EEPROMs. They are available upto 128KB in size. They uses I2C interface with host controller (MCU) which is a very popular serial communication standard. Nes games for mp5 player free download. I will write more indept tutorial on I2C in comming days and in this tutorial I will give you easy to use function that you can use without any knowledge of I2C interface.
In this tutorial we will be using 24C64 EEPROM chip which has 8192 bytes = 8 KB = 8×1024 bytes of data storage. Fig.: Circuit Setup for 24C64.
Software Setup Download and add the following files to your AVR Studio project. Now you can use the following functions for EEPROM interfacing. • 24c64.h • 24c64.c EEOpen() Arguments – None Returns – Nothing Description: This function should be called before any read/write operation. This functions initialize the communication channel. EEWriteByte(unsigned int address,uint8_t data) Arguments • address: where you want to store data. The address must be within the range of EEPROM chip used.
• data: 8 bit data you want to store at the address given. Returns • 1 on success • 0 on failure Description: Use this function to store a 8bit value in any EEPROM storage cell. EEReadByte(unsigned int address) Arguments • address: from where you want to read data. The address must be within the range of EEPROM chip used. Returns • The value stored in the specified EEPROM storage cell. Description: Use this function to read a 8bit value from any EEPROM storage cell.