串口输入十六进制字符串数据，接收后转换为十进制数据

int main(int argc,char * argv[]){    int fd;    int recv_buf[64];    int addr = 0,reg = 0,rw,i2cnum;    char i2cdev[64];    if(argc!=4)    {        printf("Usage:i2c_read [ADDR] [REG] [I2CBUSNUM]\n");        return 0;    }    //addr=atoi(argv[1]);    //reg=atoi(argv[2]);    i2cnum=atoi(argv[3]);    sprintf(i2cdev,"/dev/i2c-%d",i2cnum);    sscanf(argv[1],"%x",&addr);   //通过sscanf函数转换    sscanf(argv[2],"%x",&reg);                fd=open(i2cdev,O_RDWR);    if(fd==-1)    {        printf("Can not open the device!\n");        return -1;    }    recv_buf[0]=i2c_read(fd,addr,reg);    printf("READ I2C SLAVEADDR=0x%02X, ADDR=0x%02X DATA=0x%02X\n",addr,reg,recv_buf[0]);                        close(fd);    return 0;}