public void OnFrameReceived(CANMessageFrame message)
{
var wasMessageSet = false;
var buffer = rxMessageBuffers.FirstOrDefault(x => x.CanReceiveMessage(message, swapEndian.Value));
if (buffer != null)
{
wasMessageSet = buffer.TrySetMessage(message);
if (!wasMessageSet && buffer.IsLinked)
{
for (var index = buffer.BufferId + 1; index < BufferCount; index++)
{
if (rxMessageBuffers[index].AcceptanceMaskData == buffer.AcceptanceMaskData &&
rxMessageBuffers[index].AcceptanceCodeData == buffer.AcceptanceCodeData)
{
wasMessageSet = rxMessageBuffers[index].TrySetMessage(message);
if (wasMessageSet || !rxMessageBuffers[index].IsLinked)
{
break;
}
}
}
}
}
if (wasMessageSet)
{
rxMessageInterruptsStatus.Value = true;
}
else
{
this.Log(LogLevel.Warning, "Could not find any empty mailbox for message: {0}", message);
rxMessageLossStatus.Value = true;
}
UpdateInterrupts();
}
public bool TrySetMessage(CANMessageFrame message)
{
if (Message == null)
{
Message = message;
parent.Log(LogLevel.Info, "Received message {0} in mailbox #{1}", message, BufferId);
IsMessageAvailable = true;
return(true);
}
return(false);
}
private void Transmit(ICAN sender, CANMessageFrame message)
{
lock (sync)
{
if (!started)
{
return;
}
foreach (var iface in attached.Where(x => x != sender))
{
iface.GetMachine().HandleTimeDomainEvent(iface.OnFrameReceived, message, TimeDomainsManager.Instance.VirtualTimeStamp);
}
}
}
public bool CanReceiveMessage(CANMessageFrame message, bool isSwapped)
{
if (!Enabled)
{
return(false);
}
// AMR/ACR data registers use filters based on 2 first message bytes
var data = BitHelper.ToUInt16(message.Data, 0, reverse: isSwapped);
var hasIdFilteringPassed = (message.Id == AcceptanceMaskId);
var hasDataFilteringPassed = (~AcceptanceMask & (data ^ AcceptanceCode)) == 0;
return(hasIdFilteringPassed && hasDataFilteringPassed);
}
public bool TrySetMessage(CANMessageFrame message)
{
if (IsMessageAvailable)
{
parent.Log(LogLevel.Warning, "Mailbox #{1} already contains a message: {0}", Message.ToString(), BufferId);
return(false);
}
// http://www.seanano.org/projects/canport/27241003.pdf, p.28:
// "When the 82527 receives a message, the entire message identifier, the data length code (DLC)
// and the Direction bit are stored into the corresponding message object."
DataLengthCode = (uint)message.Data.Length;
MessageId = message.Id;
Message = message;
parent.Log(LogLevel.Info, "Received message {0} in mailbox #{1}", message, BufferId);
IsMessageAvailable = true;
return(true);
}
public bool CanReceiveMessage(CANMessageFrame message, bool isSwapped)
{
if (!Enabled)
{
return(false);
}
// AMR/ACR data registers use filters based on 2 first message bytes
if (message.Data.Length == 0)
{
parent.Log(LogLevel.Warning, "Mailbox #{0} cannot receive message with no data.", BufferId);
return(false);
}
var data = BitHelper.ToUInt16(message.Data, 0, reverse: isSwapped);
var hasIdFilteringPassed = (~AcceptanceMask & (message.Id ^ AcceptanceCode)) == 0;
var hasDataFilteringPassed = (~AcceptanceMaskData & (data ^ AcceptanceCodeData)) == 0;
return(hasIdFilteringPassed && hasDataFilteringPassed);
}
