#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <time.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <getopt.h>
#include <string.h>
#define I2C_ADDR 0x50
unsigned char buf[256]=
{
0xA1, 0xA2, 0xA3
};
char val,value;
float flight;
int IIC_Write(int fd,unsigned char addr,unsigned char value)
{
unsigned char buf[2];
buf[0] = addr;
buf[1] = value;
return write(fd,buf,2);
}
int IIC_WriteBytes(int fd,unsigned char addr,unsigned char *buff,int len)
{
int i;
for(i=0; i<len; i++)
{
IIC_Write(fd, addr+i, *(buff+i));
usleep(2000);
}
return 0;
}
int IIC_ReadByte(int fd,unsigned char addr)
{
int temp = 0;
if(write(fd,&addr,1) < 0)
return -1;
if(read(fd,&temp,1) < 0)
return -1;
return temp;
}
int IIC_ReadBytes(int fd,unsigned char addr,unsigned char *buff,int len)
{
int temp = 0;
write(fd,&addr,1);
temp = read(fd,buff,len);
return temp;
}
int main(void)
{
int fd;
int i;
fd=open("/dev/i2c-1",O_RDWR);
if(fd<0)
{
printf("device open failed\n");
return 1;
}
if(ioctl( fd,I2C_SLAVE_FORCE,I2C_ADDR) < 0)
{
printf("ioctl failed:%d\n");
return 1;
}
printf("================eeprom write ==================\n");
IIC_WriteBytes(fd, 0, buf, sizeof(buf));
/*
for(i=0;i<256;i++)
{
if(IIC_Write(fd, i, i) < 0)
printf("%d ",i);
usleep(2000);
}
*/
printf("================eeprom read ==================\n");
if(IIC_ReadBytes(fd,0x00,buf,256) > 0)
{
for(i=0;i<256;i++)
{
if(i % 16 == 0)
printf("\r\n");
printf("%.2X ",buf[i]);
}
return 0;
}
else
printf("read error\r\n");
printf("\r\n\r\n");
// usleep(1000000);//sleep 0.1s
}
