[ARM] need help : unable to read eeprom using i2c

[sai shankar]

Hi I am trying to read and write a byte to eeprom using i2c in lpc2138.... here is my code.... untill repeated start and then the read condition it is going well after that i am storing the data to a buffer but its not working... please go through the code and let me know if i am doing any thing working....

#include<lpc213x.h>
#define EEPROM 0xA0
//--- LPC21XX I2C flags --------------------

#define I2C_FLAG_AA (1<<2)
#define I2C_FLAG_SI (1<<3)
#define I2C_FLAG_STO (1<<4)
#define I2C_FLAG_STA (1<<5)
#define I2C_FLAG_I2EN (1<<6)

void init_EEPROM(void);
void MT_EEPROM(void);
void MR_EEPROM(void);
static void i2c_write(int);
void i2c_stop(void);
int i2c_ctrl(unsigned int);
void check_I2C_STATUS(unsigned char);

void lcdcmd(unsigned char);
void lcddata(unsigned char);
void delay(unsigned int);
void lcdinit(void);
void display(unsigned char *str);
unsigned char d;

int main(void)
{
IO1DIR=0x07FF0000;
lcdinit();
display("EEPROM START");
delay(1000);
init_EEPROM();
MT_EEPROM();
init_EEPROM();
MR_EEPROM();
}


static void i2c_write(int byte)
{
I2C0DAT= byte;
delay(500);
check_I2C_STATUS(I2C0STAT);
I2C0CONCLR=I2C_FLAG_SI; // clearing SI bit
while(!(I2C0CONSET & I2C_FLAG_SI));
}

void i2c_stop()
{
I2C0CONCLR = I2C_FLAG_SI;
I2C0CONSET |= I2C_FLAG_AA | I2C_FLAG_STO;
}

void init_EEPROM(void)
{
PINSEL0=0x00000050; /*scl=0 p0.5 and sda = p0.7*/
delay(1);
//I2C0SCLH=0xC8;
//I2C0SCLL=0xC8;
I2C0SCLH=0x0C;
I2C0SCLL=0x0C;
delay(1);
I2C0CONCLR=0xFF;
I2C0CONSET=0x40; //I2EN
I2C0CONSET |= I2C_FLAG_I2EN; //enable I2C
//while(I2C0STAT != 0x08);
}

int i2c_ctrl(unsigned int addr)
{
int chk;
I2C0CONCLR=0xFF;
I2C0CONSET |= I2C_FLAG_I2EN | I2C_FLAG_STA;
while(!(I2C0CONSET & I2C_FLAG_SI));
I2C0DAT=addr;
check_I2C_STATUS(I2C0STAT);
I2C0CONCLR = I2C_FLAG_STA | I2C_FLAG_SI;
if(addr & 1)
chk = 0x40;
else
chk = 0x18;
while(!(I2C0CONSET & I2C_FLAG_SI));
if(I2C0STAT != chk)
{
i2c_stop();
display("ERROR");
}
return 0;
}
void MT_EEPROM()
{
i2c_ctrl(0xA0);
i2c_write((0x7F>>8)&0x7F);
i2c_write(0xFF&0xFF);
i2c_write(0x31);
i2c_stop();
}

void MR_EEPROM(void)
{
unsigned char d;
i2c_ctrl(0xA0);
i2c_write((0x00>>8)&0x7F);
i2c_write(0x00&0xFF);

i2c_ctrl(0xA1);
check_I2C_STATUS(I2C0STAT);

d=(unsigned char)I2C0DAT;
delay(500);
check_I2C_STATUS(I2C0STAT);
i2c_stop();
lcdcmd(0x01);
lcddata(d);
delay(500);
}

void check_I2C_STATUS(unsigned char s)
{
lcdcmd(0x80);
lcdcmd(0x01);
switch(s)
{
case 0x08: display("Start 08");
delay(2000);
break;
case 0x10:display("Rep Start ");
delay(2000);
break;
case 0x18: display("slave+W add 18");
delay(2000);
break;
case 0x20: display("Start 20 SLA+W NA");
delay(2000);
break;
case 0x28: display("data 28");
delay(2000);
break;
case 0x30: display("data 30 NA");
delay(2000);
break;
case 0x40: display("SLA+R ack 40");
delay(2000);
break;
case 0x48: display("SLA+R Nack 48");
delay(2000);
break;
case 0x50: display("data ack 50");
delay(2000);
break;
case 0x58: display("data nack 58");
delay(2000);
break;
default : display("Wrong Status");
delay(2000);
}
}
void delay(unsigned int v)
{
int i,j;
for(i=0;i<v;i++)
for(j=0;j<1000;j++);
}
void display(unsigned char *str)
{
while(*str)
{
lcddata(*str);
str++;
}
}
void lcddata(unsigned char c)
{
IO1CLR=0x07F80000;//p0.3 to p0.10
IO1SET=c<<19;
IO1SET=0x00010000;//rs=1 at p0.0
IO1CLR=0x00020000;//rw=0 at p0.1
IO1SET=0x00040000;//en=1 at p0.2
delay(100);
IO1CLR=0x00040000;//en=0 at p0.2
}
void lcdcmd(unsigned char c)
{
IO1CLR=0x07F80000;;//p0.16 to p0.23
IO1SET=c<<19;
IO1CLR=0x00010000;//rs=0 at p1.16
IO1CLR=0x00020000;//rw=0 at p1.17
IO1SET=0x00040000;//en=1 at p1.18
delay(100);
IO1CLR=0x00040000;//en=0 at p0.18
}

void lcdinit()
{
lcdcmd(0x38);
lcdcmd(0x01);
lcdcmd(0x0e);
lcdcmd(0x06);
}


thanks in advance