code for interfacing 24C16 I2C EEPROM with 8051

Can anyone give me the code (in 'C')required


GIMME CODE!!

Eventually all us old farts will pass and what are you young whippersnappers that have been given finished code every time gonna do then. You never learned to code your own and there will be nobody to give it to you.

Try coding your own, and post the problems with your OWN code here and help will be forthcoming.

Erik

The following appnote explains how to interface with an I2C bus device; source code is for C166, but it is very easy to adapt it to 8051.
Moreover, this appnote explains the theory of I2C bus interfacing, so I think you will learn how to act in solving such problems.
Combining this information with the 24C16 Datasheet will let you reach your goal.

http://www.infineon.com/cmc_upload/migrated_files/document_files/Application_Notes/ap162501.pdf

http://www.infineon.com/cmc_upload/migrated_files/document_files/Application_Notes/ap162501.exe

I'm having problems to interfacing a 24c02 i2c EEPROM with 8051

The best (and most) IIC appnotes:
http://www.semiconductors.philips.com/buses/i2c/support/index.html

Erik

Hi,

Try going here:-
http://www.atmel.com/dyn/products/product_card.asp?family_id=647&family_name=Serial+EEPROM&part_id=2479
and d/l the file and pdf, together they should give you everything you need, the only problem you should then face is working out how to include 'asm' as part of your project.
Alternativly - and its not very difficult to understand - you could treat it as a learning exercise, understand the code and write your own routines in C.

Mark.

Hello!
I have write a program to write and read to/from AT24c04 serial ROM (89C52 interface with AT24C04). I am using Keil C to program.

But i can read any data which i have write to AT24c04.
I don't know exacterly why.

My purpose is very simple. I listent from USART and get data from PC key board. If the character which i get from pc is 'w' or 'W' then i do get data from PC and write to AT24c04 until i get the 0x0D. Now if i get the 'r' or 'R' character from PC i read data which i have just write to AT24c04 and send back to PC.
But i can't read any.

Here is my code

#include <REG52.h>

unsigned char data DEVICEADD;

sbit SDA = P1^0;
sbit SCL = P1^1;

int data c;
char data wrom;
char data rrom;


void outchar(char data chr)
{
while(!TI)
{
}
TI = 0;
SBUF = chr;
}

void outstr(char* str)
{
while(*str != 0)
{
outchar(*str++);
}
}
char i2c_start(void)
{
/*
if(!SDA || !SCL)
return 0; // i2c_start error: bus not free
*/
// Both bus lines are high,
SDA = 0; // so set data line low to generate a start condition.
SCL = 0;
/*
SDA = 1;
SCL = 1;
SDA = 0;
SCL = 0;
*/
return 1;
}

void i2c_stop(void)
{
/*
SDA = 0;
SCL = 1;
SDA = 1;
*/
unsigned char input_var;
SCL = 1;
SDA = 0;
SCL = 1;
SDA = 1;
input_var = SDA;
}

// return ack value: 0 for fale; 1 for success
char i2c_write(char data byte)
{
int data i;
for(i = 0; i < 8 ; i++)
{
SDA = ((byte & 0x80) ? 1 : 0);
SCL = 1; // Ensure that the data is stable during the high period.
byte <<= 1;
SCL = 0;
}
// Get ack
SDA = 1;
SCL = 1;
i = SDA;
//i = 500;
SCL = 0;
/*
while(i-- && SDA)
{
}
*/
return !i; // Get data at end of cycle.
}

char i2c_writebyte(int data address, char data byte)
{
if(!i2c_start())
{
outstr("i2c_start error: bus not free.\n");
return 0;
}
if(!i2c_write(DEVICEADD))
{
i2c_stop();
i2c_start();
if(!i2c_write(DEVICEADD)) // Interface failed to acknowledge device address
{
i2c_stop();
outstr("Interface failed to acknowledge device address.\n");
return 0;
}
}

if(!i2c_write(address >>8)) // Interface failed to acknowledge byteH address
{
i2c_stop();
outstr("Interface failed to acknowledge byteH address.\n");
return 0;
}
if(!i2c_write(address)) // Interface failed to acknowledge byteL address
{
i2c_stop();
outstr("Interface failed to acknowledge byteL address.\n");
return 0;
}
if(!i2c_write(byte)) // Interface failed to acknowledge data
{
i2c_stop();
outstr("Interface failed to acknowledge data.\n");
return 0;
}
i2c_stop();
return 1; // success
}

char i2c_read(char data ACK)
{
char index, byte;
index = SDA; // Put data pin into read mode
byte = 0x00;
for(index = 0; index < 8; index++) // Send 8 bits to the I2C Bus
{
byte <<= 1;
SCL = 1; // Clock the data into the I2C Bus
byte |= SDA; // Input the data from the I2C Bus
SCL = 0;
}

// Write ack bit
SDA = ACK;
SCL = 1; // Ensure that the data is stable during the high period.
SCL = 0;
return byte;
}

char i2c_readbyte(int data address)
{
char data byte;
if(!i2c_start())
{
outstr("i2c_start error: bus not free.\n");
return 0;
}
if(!i2c_write(DEVICEADD))
{
i2c_stop();
i2c_start();
if(!i2c_write(DEVICEADD)) // Interface failed to acknowledge device address
{
i2c_stop();
outstr("Interface failed to acknowledge device address.\n");
return 0;
}
}

// Transmit address to read from.
if(!i2c_write(address >> 8)) // Interface failed to acknowledge byteH address
{
i2c_stop();
outstr("Interface failed to acknowledge byteH address. \n");
return 0;
}
if(!i2c_write(address)) // Interface failed to acknowledge byteL address
{
i2c_stop();
outstr("Interface failed to acknowledge byteL address. \n");
return 0;
}

// Now terminate write operation and do a read.
if(!i2c_start())
{
outstr("i2c_start error: bus not free.\n");
return 0;
}
// Transmit address to read from.
if(!i2c_write(DEVICEADD | 1)) // Slave failed to ack read access
{
i2c_stop();
outstr("Slave failed to ack read access.\n");
return 0;
}
// Read from address and ack = 1.
byte = i2c_read(1);
i2c_stop();
return byte;
}

char get_char()
{
while(!RI)
{
}
RI = 0;
return SBUF;
}


void WriteData()
{
char data ch;
ch = get_char();
while(ch != 0x0D)
{
i2c_writebyte(c++,ch);
outchar(ch);
ch = get_char();
}
wrom = 0;
ES = 1;
}

void ReadData()
{
char data index;
char data input;
for(index = 0; index < c; index++)
{
input = i2c_readbyte(index);
if(input != 0)
outchar(input);
}
c = 0;
rrom = 0;
ES = 1;
}

void main(void)
{
// Init serial
SCON = 0x52;
// Set timer1 mode and reload value
TMOD &= ~0xF0; // clear timer 1 mode bits
TMOD |= 0x20; // put timer 1 into MODE 2 8 bit auto reload
TH1 = 0xFD;
TR1 = 1; // start timer 1
TI = 0;
ES = 1; // Enable Serial interrupt
EA = 1; // Enable all interrupts

c = 0;
rrom = 0;
wrom = 0;
DEVICEADD = 0xA0; // 10100000B
while(1)
{
if(wrom == 1)
{
outchar('W');
WriteData();
}
if(rrom == 1)
{
outchar('R');
ReadData();
}
/*
count = get_char();
outchar(count);
*/
}
}

void serial (void) interrupt 4 using 3
{
char data inp;
if(RI) // Received data interrupt
{
RI = 0;
inp = (char)SBUF;
if((inp == 'w') || (inp == 'W'))
{
ES = 0;
rrom = 0;
c = 0;
TI = 1;
wrom = 1;
}
else if((inp == 'r') || (inp == 'R'))
{
ES = 0;
wrom = 0;
TI = 1;
rrom = 1;
}
}
else if(TI) // Transmitted data interrupt
{
TI = 0;
}
}

Could you help me ?