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...
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...
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!
# 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...???
First Format the code see "Tips for Posting Messages". Second do you have a oscilloscope?
What does the Datasheet tell you?