linux下 读取EEPROM

linux下 读取EEPROM 24CXX

#include
#include
#include
#include
#include
#include

#define CHIP_ADDR 0x50   //24CXX
#define PAGE_SIZE 64 //根据自己的数据手册
#define I2C_DEV "/dev/i2c-0"

static int read_eeprom(int fd,char buff[],int addr,int count)
{
     int res;
     if (write(fd,&addr,1)!=1)
     {
    printf("Can't write %s's addr %d\n",I2C_DEV,addr);
    return -1;
     }
     res = read(fd,buff,count);
     printf("read %d bytes at 0x%02x\n\r",res,addr);
     return res;
}
static int write_eeprom(int fd,char buff[],int addr,int count)
{
   int res;
   int i;
   static char sendbuffer[PAGE_SIZE+1];
  
   memcpy(sendbuffer+1,buff,count);
   sendbuffer[0]=addr;
   
   res = write(fd,&addr,count+1);
   printf("write %d bytes at 0x%02x\n\r",res,addr);
   return res;
}

int main(void)
{
int fd,i,res;
unsigned char buf[PAGE_SIZE];

fd=open(I2C_DEV,O_RDWR);
if(fd<0)
   {
    printf("Can't Open %s !!!\n\r",I2C_DEV);
    return -1;
   }

    res = ioctl(fd,I2C_TENBIT,0);
    res = ioctl(fd,I2C_SLAVE,CHIP_ADDR);

for(i=0;i    {
     write_eeprom(fd,buf,i,1);
   } 
for(i=0;i    {
    read_eeprom (fd,buf+i,i,1);
    printf("buf[0x%02x] = 0x%02x\n\r",i,buf[i]);
   }

    close(fd);
    return 0;
}