code for interfacing 24C16 I2C EEPROM with 8051

Could you give me, your full source code, which you had test sucess.
Thanks.

Could you give me, your full source code, which you had test sucess.
Thanks.

This is all the code for C167 to 24C08.

You will need to sort out your own 'printf' statement.

#define _MAIN_
/*********************************************************************/

/*********************************************************************/

#include <reg167.h>
#include <stdio.h>
#include <string.h>

//I2C values
#define INPUT DP2 = DP2 & 0xBFFF; //bit 14 of P2 used for I2C data line
#define OUTPUT DP2 = DP2 | 0xC000; // bit 14 is ourput , lets do bit 15 here as well!
#define SETCLOCK P2 = P2 | 0x8000; //bit 15 high
#define CLRCLOCK P2 = P2 & 0x7FFF; //bit 15 low
#define SETDATA P2 = P2 | 0x4000; //bit 14 high
#define CLRDATA P2 = P2 & 0xBFFF; //bit 14 low
#define BOTHHIGH P2 = P2 | 0xC000; //bits 14 and 15 high
#define BOTHLOW P2 = P2 & 0x3FFF;
#define RD 0x01;
#define WR 0x00;






/* global */
unsigned char delayfull;
unsigned char delayhalf;
unsigned char onebit[16];
unsigned char rx;


/*** Executable Functions ***/
void fnDelay(unsigned char mydelay)
{
unsigned char uchCounter;
for(uchCounter = 0; uchCounter < mydelay; uchCounter ++); //need to play with this
}



void fnI2C_SendStart()
{
OUTPUT
SETDATA
SETCLOCK
fnDelay(delayhalf);
CLRDATA
fnDelay(delayhalf);
CLRCLOCK
fnDelay(delayhalf);
}


void fnI2C_SendStop()
{
OUTPUT
BOTHLOW
SETCLOCK
fnDelay(delayhalf);
SETDATA
fnDelay(delayhalf);
CLRCLOCK
fnDelay(delayhalf);
}

//receive byte function

/* Read Byte */

unsigned char fnI2C_ReceiveByte()
{
unsigned char uchBitCounter;
unsigned char uchBitSelection;

INPUT

uchBitSelection=0x00;

for(uchBitCounter=0;uchBitCounter<8;uchBitCounter++)
{
SETCLOCK
fnDelay(delayfull);

if((P2 & 0x4000) > 0) //looking for data on bit 14

uchBitSelection|=0x01;

if(uchBitCounter<7)
uchBitSelection<<=1;

fnDelay(delayfull);
CLRCLOCK
fnDelay(delayfull);
}

OUTPUT
CLRDATA
fnDelay(delayfull);
SETCLOCK
fnDelay(delayfull);
CLRCLOCK
INPUT

return uchBitSelection;
}

unsigned char fnI2C_ReceiveByteNA()
{
unsigned char uchBitCounter;
unsigned char uchBitSelection;

INPUT

uchBitSelection=0x00;

for(uchBitCounter=0;uchBitCounter<8;uchBitCounter++)
{
SETCLOCK
fnDelay(delayfull);
if((P2 & 0x4000) > 0) // is bit 14 held high then the data is a 1
uchBitSelection|=0x01;

if(uchBitCounter<7)
uchBitSelection<<=1;

fnDelay(delayfull);
CLRCLOCK
fnDelay(delayfull);
}

SETCLOCK
fnDelay(delayfull);
CLRCLOCK

return uchBitSelection;
}




/* Send Byte */

unsigned char fnI2C_SendByte(unsigned char uchByte)
{
unsigned char uchBitCounter;
unsigned char uchBitSelection;

OUTPUT

uchBitSelection = 0x80;

for(uchBitCounter = 0; uchBitCounter <8; uchBitCounter ++)
{
if(uchByte & uchBitSelection)
SETDATA
else
CLRDATA

uchBitSelection >>= 1;

SETCLOCK
fnDelay(delayfull);
CLRCLOCK
fnDelay(delayfull);
CLRDATA
}
CLRDATA //august
INPUT
SETCLOCK
fnDelay(delayfull);
// should check if acknowledge is received uchBitSelection = _PTA.Byte;
CLRCLOCK

uchBitSelection ^= 0xFF;
uchBitSelection &= 0x08; //20 SHOULD BE 08
fnDelay(delayfull);
//return uchBitSelection;
}




/* Function Definitions */






// Main Function Entered From Reset

void main (void) {

unsigned char i;
long x;




delayfull = 8;//play with these to get the i2c repetition rate
delayhalf = 4;







DP2 = 0xFF00;

P2 = P2 & 0x00FF; //clear top 8 bits





IEN = 1; /* Enable Interrupts (for monitor) */


//write one byte to flash
fnI2C_SendStart();
fnI2C_SendByte(0xA0); //device address write mode
fnI2C_SendByte(0); //lo address
fnI2C_SendByte(45); //a number
fnI2C_SendStop();

//nasty - should check for something in the chip
//wait for data line to go low

for (i=0;i<80;i++) //worked at 100 and 80 and 60, failed at 40
{
fnDelay(127);
}

//read it from flash
//random access read according to st
fnI2C_SendStart();
fnI2C_SendByte(0xA0); //device address write mode
fnI2C_SendByte(0);
fnI2C_SendStart();
fnI2C_SendByte(0xA1); // read

i = fnI2C_ReceiveByteNA(); //NA??

fnI2C_SendStop();

printf("%d",i);





/* Loop forever */



while(1)
{


} // end of while forever loop



} //end of main


....

good luck

steve robinson