interfacing MMA7660FC with at89s52

the formula however doesnot work. it crashes.

You are mixing C and assembly in a wrong way. I suggest you to use I2C driver written in C instead of doing things this way. see the i2c tutorial and download complete code from there.

check this one

after a looooooooooooooooooong time, but i am baaaaack. lots of stuff had to be done like studying for exam, submitting journals and completing project.... but now i am freeeee. (vivas left though ). but will pick up the project from where i left.

Dont worry omega123 I wish you a very good luck!

say if I want to port my project to Atmega will it be okay?? the system made in 8051 is not reliable.... But..

1. Atmega is new for me. I know a very little about it.
2. but now i have about a month but lots of time to complete the project as all exams will finally be over.

No problem in porting. You can use inbuilt I2C module of Atmega. will be a good support and gives you more stability on driver level.

You were new to 8051 too isnt it? yeah consider this project as your target and start learning AVR. its a good start after studies are over

Please help with this code. its about pcf8951. I have used the i2c library by ajay bhargav. I also want to see the output serially on the computer. what modifications are to be made so that the output can be viewed serially. Also please check the code. i want the output from channel 0 with input from ainalog input zero. I have also checked the program on keil using the i2c plugin from this site. after read i get a no ack. please help. it is very urgent.

#include <AT89X52.H>

#include "I2C_LIB.H"

void ini_uart(void);
void DelayMs(unsigned int);
void sendtopc(unsigned char*);
void tx(unsigned char);

unsigned char buffer[1];

void main (void)
{
ini_uart();
master(0x90);
DelayMs(20);
send_byte(0x44);
DelayMs(20);
send_byte(0x00);
DelayMs(20);
send_stop();
/*
0x98= device address
0x07= mode register address
1= no of bytes
0x01= data
*/
while(1)
{
master(0x91);
recv_byte(1);
DelayMs(500);
}
}


void ini_uart(void)
{
TMOD=0X20;
SCON=0X50;
TH1=0XFD;
TL1=0XFD;
TR1=1;
sda=scl=1;
}

void sendtopc(unsigned char *str)
{
while(*str)
tx(*str++);
}


void tx(unsigned char x)
{
SBUF=x;
while(TI==0);
TI=0;
}


void DelayMs(unsigned int count) 
{  // mSec Delay 11.0592 Mhz 
    unsigned int i;		       	
    while(count) {
        i = 115; 
		while(i>
0) i--;
        count--;
    }
}

the adc code

@ omega123
check this code
connect pcf chip pins A0,A1,A2 to ground and also give clock on OSC pin
refer for circuits on net
its read channel 0 and send it on terminal
use terminal program instead of hyper terminal