EEPROM i2c problem! Lack of AKC after data

[milem]

EEPROM i2c problem!

I need help with i2c EEPROM!

I built code to write and read from I2c EEPROM conected to 89s52 (at 24MHz)
but i have problem!

when i send first byte of device adress i get ACK from memory, but when
i send memory byte (start of memory) i don't get ACK, what is the problem!

P.S. Simulation in Keil and Protheus report that code is working!

 

[erio]

Re: EEPROM i2c problem!

the problem maybe adding more delay? or maybe the speed of your eeprom memory do not match (100khz or 400khz?)

posting your code here make things clearer..

 

[milem]

Re: EEPROM i2c problem!

My code is :

void send (void)
{
TR1=1;
	i2sda=i2scl=1;NOP;	 	// Signali starta
	i2sda=0;NOP;i2scl=0;	//
	k=0;
	TR1=1;
	i=0;
	send_byte(0xA0);	//Slanje adrese
	NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;
	if(i2sda==0) {write_string("1100");}
	else {write_string("1000");return;}
	i=0;
	send_byte(0x01);
	NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;
	if(i2sda==0) {write_string("2100");}
	else {write_string("2000");return;}
			
	i=0;
	send_byte(p[0]);
	NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;
	if(i2sda==0) {write_string("3100");}
	else {write_string("3000");return;}
	i=0;						 
	send_byte(p[1]);
	NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;
	if(i2sda==0) {write_string("4100");}
	else {write_string("4000");return;}
	i=0;
	send_byte(p[2]);
	NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;
	if(i2sda==0) {write_string("5100");}
	else {write_string("5000");return;}
	i=0;
	send_byte(p[3]);
	NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;NOP;
	if(i2sda==0) {write_string("6100");}
	else {write_string("6000");return;}
	i=0;
	while(i2scl==1) {;} i2sda=0;
	while(i2scl==0) {;} i2sda=1; 
	
	TR1=0;
	i2sda=i2scl=1;
}

I using Timer1 for generating SCL impulses! Maybe is that problem, but if EEPROM
respond to adress, i mean thats Ok!

Timer1 overload function!

void Tajmer1(void) interrupt 3
{
TH1=0xF0;TL1=0x00;
	if(k==0) 
	{
		i2scl=1;	
	}
	else
	{
		i2scl=0;
	}
	k=~k;i++;
}

[/code]