programming 24c08

 programming 24c08

dear all

i am stuck in a mid part of the project...
i want to interface at24c08 eeprom with p89v51rd2...
please can any one write a workable code for me...

i only want ot send bytes of character and store it there so that i can retrieve the data some time later...
please help me... i m in a bad situation...
i have tried many other code available on the net but its not working...
please help...

 RE: programming 24c08

" am stuck in a mid part of the project..."

What kind of project? A school project?

"i have tried many other code available on the net but its not working..."

Have you tried the datasheets?

Commercial projects normally don't dare to select unknown code from the net withtout the developer understanding how the code works - and if you do understand the code, then you should also be able to modify the code according to your specific requirements.

"please can any one write a workable code for me..."

So what workable code can you write for me?

 RE: programming 24c08

ya a normal college project....
just i have connected 2 port pins to sck and data line of 24c08...
now i have to store a array of charecters into the chip...
so how can i do it...
can u write a code for me now...
please help me...
i urgently need help...

 RE: programming 24c08

Can you program in C? I don't think anybody here will write the code for you. Sorry, but you'll have to work harder - you were good enough to enroll to your studies right? So show us and above all yourself that you are indeed good enough! If you have technical questions, however, you are more than welcome!

 RE: programming 24c08

# include<reg52.h>
# include<stdio.h>
# include<intrins.h>

#define ACK 1
#define NO_ACK 0

sbit a=P2^0;
sbit b= P2^1;
char getCharacter (void);
void sendCharacter (char);
void Start(void);
void Stop(void);
unsigned char ReadI2C(bit);
unsigned char ReadBYTE(unsigned int);
void WriteBYTE(unsigned int ,unsigned char);

sbit SDA = P0^1;
sbit SCL = P0^3;

void main (void) {

char chr; unsigned char EData;

#ifndef MONITOR51 SCON = 0x50; /* SCON: mode 1, 8-bit UART, enable rcvr */ TMOD |= 0x20; /* TMOD: timer 1, mode 2, 8-bit reload */ TH1 = 0xFD; /* TH1: reload value for 1200 baud @ 16MHz */ TR1 = 1; /* TR1: timer 1 run */ TI = 1; /* TI: set TI to send first char of UART */
#endif
a=0;b=0; while(1) { if(a==1) goto send; else if (b==1) goto receive; else continue; }

send: chr=0x55; WriteBYTE(0x0000,chr); printf("byte stored"); goto end;

receive: printf("\nhere it is:"); EData = ReadBYTE(0x0000); printf("%c",EData); sendCharacter(EData); printf("\ndone!!!");

end: while(1) goto end; }
/* char getCharacter (void) { char chr; while(RI!=0){;} chr=SBUF; RI=0; return(chr); } */ void sendCharacter (char chr) { while (TI!=1) {;} TI=0; SBUF=chr; return; } void Start(void)
{ SDA = 1; SCL = 1; _nop_();_nop_(); SDA = 0; _nop_();_nop_(); SCL = 0; _nop_();_nop_();
} void Stop(void)
{ SDA = 0; _nop_();_nop_(); SCL = 1; _nop_();_nop_(); SDA = 1;
} void WriteI2C(unsigned char Data)
{ int i; for (i=0;i<8;i++) {

SDA = (Data & 0x80) ? 1:0; SCL=1;SCL=0; Data<<=1; }

SCL = 1; _nop_();_nop_(); SCL = 0;
}

unsigned char ReadI2C(bit ACK_Bit)
{

unsigned char Data=0; int i; SDA = 1; for (i=0;i<8;i++) { SCL = 1; Data<<= 1; Data = (Data | SDA); SCL = 0; _nop_(); }

if (ACK_Bit == 1) SDA = 0; // Send ACK else SDA = 1; // Send NO ACK

_nop_();_nop_(); SCL = 1; _nop_();_nop_(); SCL = 0;

return Data;
} unsigned char ReadBYTE(unsigned int Addr)
{ unsigned char Data; Start(); WriteI2C(0xA0); WriteI2C((unsigned char)(Addr>>8)&0xFF); WriteI2C((unsigned char)Addr&0xFF); Start(); WriteI2C(0xA1); Data = ReadI2C(NO_ACK); Stop(); return(Data);
} void WriteBYTE(unsigned int Addr,unsigned char Data)
{ Start(); WriteI2C(0xA0); WriteI2C((unsigned char)(Addr>>8)&0xFF); // send address high WriteI2C((unsigned char)Addr&0xFF); // send address low WriteI2C(Data); Stop();
}

now this program is not working...
can anyone help me with this....
is the addressing i am doing for 24c08 valid or it should be different...???

 RE: programming 24c08

First Format the code see "Tips for Posting Messages".
Second do you have a oscilloscope?

 RE: is the addressing i am doing for 24c08 valid or it should be different...???

What does the Datasheet tell you?

 RE: programming 24c08

I had a very very quick look at the unformatted posted code. what a mess! have you noticed that your program probably (unless I missed the indentation...) hangs in an infinite loop? here:

end: while(1) goto end; }

also check the timing of your I2C signals. have you looked at the data sheet for full information regarding that issue? note that depending on your hardware speed, the generated waveform can change significantly violating minimum/maximum holding times for the signals.
and try to avoid using goto.

 RE: programming 24c08

an infinite loop after a single interaction might be exactly what you want, of course.

 RE: programming 24c08

Why make such a complicated infinite loop?

Wouldn't

while (1) ;

or

for (;;) ;

or

do {} while (0);

be a bit simpler to write - and not involve the #1 spaghetti construct "goto"?