/// <summary>
/// Task for processing received data running in thread
/// </summary>
private void ModbusRtuLinkTask()
{
while (true)
{
Thread.Sleep(0);
int value;
switch (ActualState)
{
case ModbusRtuLinkState.INIT:
// Init mode, wait for first 3.5 char framing timeout
break;
case ModbusRtuLinkState.IDLE:
// Idle mode, wait for incoming message
value = PHY.Receive();
if (value != -1)
{
byte ReceivedByte = Convert.ToByte(value);
ActualFrameIndex = 0;
ActualFrame[ActualFrameIndex++] = ReceivedByte;
ActualState = ModbusRtuLinkState.RECEIVING;
FramingTimer.Start();
}
break;
case ModbusRtuLinkState.RECEIVING:
// Receive all message bytes until framing timeout
value = PHY.Receive();
if (value != -1)
{
FramingTimer.Stop();
byte ReceivedByte = Convert.ToByte(value);
ActualFrame[ActualFrameIndex++] = ReceivedByte;
FramingTimer.Start();
}
break;
case ModbusRtuLinkState.PROCESSING:
// Process message
ProcessReceivedData();
ActualState = ModbusRtuLinkState.IDLE;
break;
}
}
}
/// <summary>
/// Handler for 3.5 character framing timer - should retun as fast as possible
/// </summary>
private void FramingTimeoutHandler(object sender)
{
switch (ActualState)
{
case ModbusRtuLinkState.INIT:
// Init state timeout elapsed, set state to idle
Debug.WriteLine("LINK - SYNC_OK");
ActualState = ModbusRtuLinkState.IDLE;
break;
case ModbusRtuLinkState.RECEIVING:
// Message reception timed out, process received data
ActualState = ModbusRtuLinkState.PROCESSING;
break;
case ModbusRtuLinkState.IDLE:
case ModbusRtuLinkState.PROCESSING:
// Link is idle or processing message, wait
break;
}
return;
}
