public override bool Poll(out byte[] buf) {
//int oldSt=_st;
buf=null;
bool busy=false;
if(_pt<DateTime.Now) {
if(_st==-4) {
_st=-3;
buf=new byte[] { ADDR, 0x03, 0x01, 0x1A, 0x88 };
_pt=DateTime.Now.AddMilliseconds(500);
busy=true;
} else if(_st==-2) {
_st=-1;
buf=new byte[] { ADDR, 0x03, 0x01, 0x07, 0xE1 };
_pt=DateTime.Now.AddMilliseconds(500);
busy=true;
} else if(_st==0) {
buf=new byte[] { ADDR, 0x01, 0x04, 0x00, 0xF2, 0x01, 0x00, 0x24 }; // Pressure oversampling x1, Temperature oversampling x1, Humidity oversampling x1
_pt=DateTime.Now.AddMilliseconds(30);
_st=1;
busy=true;
} else if(_st==1) {
buf=new byte[] { ADDR, 0x01, 0x02, 0x00, 0xF4, 0x25 }; // forced mode
_pt=DateTime.Now.AddMilliseconds(10);
_st=2;
busy=true;
} else if(_st==2) {
buf=new byte[] { ADDR, 0x03, 0x01, 0x08, 0xF7 };
_pt=DateTime.Now.AddMilliseconds(500);
_st=3;
busy=true;
} else {
busy=true;
}
//if(oldSt!=_st) {
// Log.Debug("{0} st={1}, busy={2}", _T.parent.path, _st, busy);
//}
} else {
busy=_st!=1;
}
return busy;
}
public override void Reset() {
