DS1338 i2c Read issue - linux

Question

Hi I'm trying read the time from RTC-DS1338 with my linux Single Board Computer, but there is a problem with my code. I'm reading bad outputs with it.
I tried to read with i2cget -y 0 0x68 0 it works. but my code does not.
Can anybody help me ?
#include <stdio.h>
#include <fcntl.h>
#include <linux/i2c-dev.h>
#include <errno.h>
#define I2C_ADDR 0x68
int main (void)
{
char value;
int fd;
unsigned char pData[10];
char i;
if ((fd = open("/dev/i2c-0", O_RDWR)) < 0)
{
printf("Error: Couldn't open device! %d\n", fd);
return 1;
}
if (ioctl(fd, I2C_SLAVE, I2C_ADDR) < 0)
{
printf("Error: Couldn't find device on address!\n");
return 1;
}
while (1)
{
if (read(fd, &pData, 4) != 4)
{
perror("Read conversion");
}
else
{
for(i=0;i<4;i++) printf(" %02x ",(pData[i] & 0xFF));
printf("\n");
}
sleep(2);
}
return 0;
}
Bad Output:
00 b3 49 47
4e 27 09 21
24 81 29 00
1a 20 02 10
16 1e 1a 46
1a 00 96 18
45 82 03 e0
24 40 88 1c
Good Data:
00 05 08 00
01 05 08 00
02 05 08 00
03 05 08 00
04 05 08 00
05 05 08 00

Answer 1

I have resolve my problem with the below code
if ((fd = open("/dev/i2c-0", O_RDWR)) < 0)
{
printf("Error: Couldn't open device! %d\n", fd);
return 1;
}
if (ioctl(fd, I2C_SLAVE, I2C_ADDR) < 0)
{
printf("Error: Couldn't find device on address!\n");
return 1;
}
if (write(fd, wData, 1) != 1)
{
perror("Write to register");
}
if (read(fd, rData, 64) != 64)
{
perror("Read conversion");
}
else
{
memcpy(Dat,rData,7);
}
close(fd);
return 0;