//Event handler for the serial port data
private void xbeePort_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
//Check to see if the first byte received is 0x7e for a valid packet
if (xbeePort.ReadByte() == 0x7E)
{
//Wait a tenth of a second for the rest of the data to be available
System.Threading.Thread.Sleep(200);
//Get the packet length as individual bytes
int msbLength = xbeePort.ReadByte();
int lsbLength = xbeePort.ReadByte();
//Get the total length as combined bytes
int totalLength = (msbLength << 8) | lsbLength;
//Buffer for the incoming data
byte[] incomingData = new byte[totalLength];
//Get the entire packet
xbeePort.Read(incomingData, 0, totalLength);
//The last byte we get should be the checksum
int checksum = xbeePort.ReadByte();
//Check the entire packet for validity
if (challengeChecksum(incomingData, checksum))
{
//If it's valid, assemble the data into an rx (receive) frameData class
WATR_XBeeRxFrameData data = new WATR_XBeeRxFrameData(incomingData);
//Raise an event saying we've got valid data and pass the framedata to it
WATR_ValidDataGetArgs validDataGet = new WATR_ValidDataGetArgs(data);
if (validDataGet != null)
ValidDataGet(this, validDataGet);
}
else
{
//If it's not valid, send an event saying it's not valid
//Keep them as bytes; they may not assemble properly into frame data and may cause an error
WATR_InvalidDataGetArgs invalidDataGet = new WATR_InvalidDataGetArgs(incomingData);
if (invalidDataGet != null)
InvalidDataGet(this, invalidDataGet);
}
}
}
public WATR_ValidDataGetArgs(WATR_XBeeRxFrameData data)
{
this.Data = data;
}