/// <summary>
/// Worker thread to indicate received frames to upper layer sequentially.
/// </summary>
private void DataIndicationThread()
{
while (true)
{
_rxEvent.WaitOne();
if (_rxThreadExit)
break;
while (true)
{
Frame frame = null;
lock (_rxFrameQueue)
{
frame = _rxFrameQueue.GetFrame();
}
if (frame == null)
break;
byte lqi = frame.ReadByte(frame.LengthDataUsed - 1); // pull LQI from frame
frame.DeleteFromBack(1);
Header hdr = new Header();
if (hdr.ReadFromFrameHeader(frame, true))
{
ReceiveData(hdr, ref frame, lqi);
}
Frame.Release(ref frame);
}
}
}
/// <summary>
/// process frame from Phy layer. FCS has been removed already.
/// </summary>
/// <param name="sender"></param>
/// <param name="frame"></param>
/// <param name="linkQuality"></param>
public void PhyDataIndication(
IPhyDataSap sender,
ref Frame frame,
Byte linkQuality)
{
Frames.Type type;
bool ok = Header.GetType(frame, out type);
if (ok && type == Frames.Type.Data)
{
frame.AllocBack(1);
frame.Write(frame.LengthDataUsed - 1, linkQuality);
lock (_rxFrameQueue)
{
_rxFrameQueue.AddFrame(ref frame);
}
_rxEvent.Set();
Frame.Release(ref frame);
return;
}
Header hdr = new Header();
if (hdr.ReadFromFrameHeader(frame, true))
{
switch (hdr.fcs.Type)
{
case Microsoft.SPOT.Wireless.IEEE_802_15_4.Mac.Frames.Type.Beacon:
ReceiveBeacon(hdr, ref frame, linkQuality);
break;
case Microsoft.SPOT.Wireless.IEEE_802_15_4.Mac.Frames.Type.Cmd:
ReceiveCommand(hdr, ref frame, linkQuality);
break;
default:
// drop, data and ack frames are handled before
break;
}
}
}
