public override bool Poll(out byte[] buf) {
buf=null;
bool busy=false;
if(_pt<DateTime.Now) {
if(_st==-2) {
buf=new byte[] { ADDR, 0x03, 0x01, 0x16, 0xAA };
_pt=DateTime.Now.AddMilliseconds(500);
_st=-1;
busy=true;
} else if(_st==0) {
buf=new byte[] { ADDR, 0x01, 0x02, 0x00, 0xF4, 0x2E };
_pt=DateTime.Now.AddMilliseconds(15);
_st=1;
busy=true;
} else if(_st==1) {
buf=new byte[] { ADDR, 0x03, 0x01, 0x02, 0xF6 };
_pt=DateTime.Now.AddMilliseconds(1);
_st=2;
busy=true;
} else if(_st==2 || _st==3) {
buf=new byte[] { ADDR, 0x01, 0x02, 0x00, 0xF4, (byte)(0x34 | (BMP180_OSS<<6)) };
_pt=DateTime.Now.AddMilliseconds(500); // Wait ack
_st++;
busy=true;
} else if(_st==4) {
buf=new byte[] { ADDR, 0x03, 0x01, 0x03, 0xF6 };
_pt=DateTime.Now.AddMilliseconds(500);
_st=5;
busy=true;
} else {
busy=true;
}
} else {
busy=_st!=0;
}
return busy;
}
public override void Reset() {
