private void RaiseFaultStateChange(ProcessorFaultState oldState, ProcessorFaultState newState)
{
if (FaultStateChanged != null)
{
FaultStateChanged(this, new LogixFaultStateChangedEventArgs(oldState, newState));
}
}
/// <summary>
/// Creates a new LogixFaultStateChangedEventArgs object
/// </summary>
/// <param name="oldFault">Old Fault State</param>
/// <param name="newFault">New Fault State</param>
internal LogixFaultStateChangedEventArgs(ProcessorFaultState oldFault, ProcessorFaultState newFault)
{
OldState = oldFault;
NewState = newFault;
}
private void DecodeAttributeReply(byte[] data)
{
//Ok, first is the number of attributes...
ushort numAttrs = BitConverter.ToUInt16(data, 0);
if (numAttrs != 0x07)
{
return; //Error, not enough attributes returned
}
int offset = 2;
//The format of the reply seems to be:
//[2:AttributeId][Variable Data]
for (int i = 0; i < 7; i++)
{
//Read 2 bytes for the Attribute Id:
ushort attribId = BitConverter.ToUInt16(data, offset);
offset += 2;
switch (attribId)
{
case 0x01: //VendorId
//Returns 2 words for some reason, data is in the lower
//word...
offset += 2;
_vendorId = BitConverter.ToUInt16(data, offset);
offset += 2;
break;
case 0x02: //Device Type
//Also 2 word reply...
offset += 2;
_deviceType = BitConverter.ToUInt16(data, offset);
offset += 2;
break;
case 0x03: //Product Code
//Again 2 words...
offset += 2;
_productCode = BitConverter.ToUInt16(data, offset);
offset += 2;
break;
case 0x04: //Revision
//Another 2 words
offset += 2;
_majorRevision = data[offset];
_minorRevision = data[offset + 1];
offset += 2;
break;
case 0x05: //Status
//2 words
offset += 2;
//This gets a little complicated here...
//State is stored in the upper nibble of the byte...
ProcessorState oldState = _state;
_state = (ProcessorState)(byte)((data[offset] & 0xF0) >> 4);
offset += 1;
//Fault state is in the lower nibble
ProcessorFaultState oldFault = _faultState;
_faultState = (ProcessorFaultState)(byte)((data[offset] & 0x0F));
//Keyswitch position is in the upper nibble
ProcessorKeySwitch oldKey = _keySw;
_keySw = (ProcessorKeySwitch)(byte)((data[offset] & 0xF0) >> 4);
offset += 1;
//Take care of events
if (_stateEventsEnabled)
{
if (oldState != _state)
{
RaiseProcessorStateChange(oldState, _state);
}
if (oldFault != _faultState)
{
RaiseFaultStateChange(oldFault, _faultState);
}
if (oldKey != _keySw)
{
RaiseKeySwitchChange(oldKey, _keySw);
}
}
break;
case 0x06: //Serial Number
//This returns 3 words, data is in the lower 2...
offset += 2;
_serialNumber = BitConverter.ToUInt32(data, offset);
offset += 4;
break;
case 0x07: //Product Name
//Skip one word
offset += 2;
//Get the size of the string...
byte sSize = data[offset];
offset += 1;
_productName = System.Text.ASCIIEncoding.ASCII.GetString(data, offset, sSize);
offset += sSize;
break;
default:
break; //This is an error
}
}
}