/// <summary>
/// Notify subsriber that data is available for debugging
/// </summary>
/// <param name="entry"></param>
internal virtual void NotifySerialData(DebugBufferEntry entry)
{
EventHandler <DebugEntryArgs> handler = OnSerialData;
if (handler != null)
{
handler(this, new DebugEntryArgs(entry));
}
}
/// <summary>
/// Connect to the device and begin speaking rs232
/// </summary>
public void Connect()
{
// Lock so we only have one connection attempt at a time. This protects
// from client code behaving badly.
lock (_mutex)
{
try
{
_port = Config.GetCommPort();
}
catch (IOException)
{
NotifyError(Errors.FailedToOpenPort);
return;
}
_port.ReadTimeout = 500;
DebugBufferEntry.SetEpoch();
try
{
_port.Connect();
// Only start if we connect without error
StartRS232Loop();
IsPaused = false;
}
catch (Exception e)
{
Log.ErrorFormat("Exception Connecting to acceptor: {0}", e.Message, e);
if (OnError != null)
{
NotifyError(Errors.PortError);
}
}
}
}
/// <summary>
/// DebugEntry argument describes a debug event
/// </summary>
/// <param name="entry">DebugBufferEntry describing serial data tx/rx</param>
public DebugEntryArgs(DebugBufferEntry entry)
{
Entry = entry;
}
/// <summary>
/// The main parsing routine
/// </summary>
private void ReadAcceptorResp()
{
var data = PreviouslySentMasterMsg ?? GenerateNormalMessage();
// Attempt to write data to slave
NotifySerialData(DebugBufferEntry.AsMaster(data));
WriteWrapper(data);
// Blocks until all 11 bytes are read or we give up
var resp = ReadWrapper();
// Extract only the states and events
NotifySerialData(DebugBufferEntry.AsSlave(resp));
// No data was read, return!!
if (resp.Length == 0)
{
// Do no toggle the ack
return;
}
// Check that we have the same ACK #
if (IsBadAckNumber(resp, data))
{
PreviouslySentMasterMsg = data;
return;
}
if (IsBadSlaveChecksumOk(resp))
{
PreviouslySentMasterMsg = data;
return;
}
// Otherwise we're all good - toggle ack and clear last sent message
PreviouslySentMasterMsg = null;
Ack ^= 1;
// At this point we have sent our message and received a valid response.
// Parse the response and act on any state or events that are reported.
// Translate raw bytes into friendly enums
var slaveMessage = SlaveCodex.ToSlaveMessage(resp);
PreviousState = SlaveCodex.GetState(slaveMessage);
// Raise a state changed notice for clients
NotifyStateChange(PreviousState);
// Multiple event may be reported at once
var currentEvents = SlaveCodex.GetEvents(slaveMessage);
foreach (Events e in Enum.GetValues(typeof(Events)))
{
// If flag is set in slave message, report event
if ((currentEvents & e) == e)
{
NotifyEvent(e);
}
}
// Check for cassette missing - reports every time cashbox is missing
if (!SlaveCodex.IsCashboxPresent(slaveMessage))
{
CashboxPresent = false;
NotifyError(Errors.CashboxMissing);
}
// Only report the cashbox attached 1 time after it is re-attached
else if (!CashboxPresent)
{
CashboxPresent = true;
SafeEvent(OnCashboxAttached);
}
// Mask away rest of message to see if a note is in escrow. If this is the first
// escrow message, start the escrow timeout clock
if (!NoteIsEscrowed && PreviousState == States.Escrowed)
{
_escrowStart = DateTime.MinValue;
}
NoteIsEscrowed = PreviousState == States.Escrowed;
// Credit bits are 3-5 of data byte 3
var value = SlaveCodex.GetCredit(slaveMessage);
if (value > 0)
{
Credit = (byte)value;
}
// Per the spec, credit message is issued by master after stack event is
// sent by the slave. If the previous event was stacked or returned, we
// must clear the escrow command to completely release the note from
// escrow state.
// ReSharper disable once SwitchStatementMissingSomeEnumCasesNoDefault
switch (PreviousEvents)
{
case Events.Stacked:
NotifyCredit(Credit);
// C# does not allow fallthrough so we will goto :)
goto case Events.Returned;
case Events.Returned:
// Clear our the pending escrow command once we've stacked or returned the note
EscrowCommand = EscrowCommands.None;
Credit = 0;
break;
}
// Update the events aster the check for check so as to not lose a credit message
PreviousEvents = currentEvents;
}
/// <summary>
/// DebugEntry argument describes a debug event
/// </summary>
/// <param name="entry">DebugBufferEntry describing serial data tx/rx</param>
public DebugEntryArgs(DebugBufferEntry entry)
{
Entry = entry;
}
/// <summary>
/// Notify subsriber that data is available for debugging
/// </summary>
/// <param name="entry"></param>
internal virtual void NotifySerialData(DebugBufferEntry entry)
{
EventHandler<DebugEntryArgs> handler = OnSerialData;
if (handler != null)
{
handler(this, new DebugEntryArgs(entry));
}
}
/// <summary>
/// Notify subsriber that data is available for debugging
/// </summary>
/// <param name="entry"></param>
internal virtual void NotifySerialData(DebugBufferEntry entry)
{
var handler = OnSerialData;
handler?.Invoke(this, new DebugEntryArgs(entry));
}