int init_serial(void){
serial_fd = openPort(0);
if(serial_fd < 0)
{
printf("serial open error.\n");
exit(0);
}
//fd，115200，
setPara(serial_fd,6,8,1,0);
}
Plane::Plane(fPoint PtR, Vector N)
{
setPara(PtR, N);
}
Plane::Plane(Vector PtR, Vector N) //(R-PtR).N=0
{
setPara(PtR, N);
}