/// <summary>
/// Sends the specified frame
/// </summary>
/// <param name="frame">The frame to send</param>
// Revision History
// MM/DD/YY Who Version Issue# Description
// -------- --- ------- ------ -------------------------------------------
// 08/09/11 RCG 2.52.00 Created
private void SendFrame(ASHFrame frame)
{
if (m_SerialComm.IsOpen)
{
byte[] StuffedFrame = ASHFrame.StuffFrame(frame.RawFrame);
byte[] DataToSend = new byte[StuffedFrame.Length + 1];
frame.TimeStamp = DateTime.Now;
Array.Copy(StuffedFrame, DataToSend, StuffedFrame.Length);
DataToSend[DataToSend.Length - 1] = FLAG_BYTE;
if (m_Logger != null)
{
m_Logger.WriteASHFrameInfo(EZSPLogDirection.Send, frame);
}
// Send the Frame
lock (m_SerialComm)
{
m_SerialComm.SendData(DataToSend);
}
switch (frame.ASHFrameType)
{
case ASHFrame.FrameType.Data:
{
if (m_SentFrames.Contains(frame) == false)
{
m_SentFrames.Add(frame);
}
break;
}
}
}
}
/// <summary>
/// Retransmits the specified frame
/// </summary>
/// <param name="frame">The frame to retransmit</param>
// Revision History
// MM/DD/YY Who Version Issue# Description
// -------- --- ------- ------ -------------------------------------------
// 08/09/11 RCG 2.52.00 Created
private void RetransmitFrame(ASHFrame frame)
{
frame.AckNumber = m_NCPFrameNumber;
frame.IsRetransmitted = true;
frame.RetransmitCount++;
SendFrame(frame);
}
/// <summary>
/// Writes basic information for the ASH Layer of the protocol
/// </summary>
/// <param name="direction">The direction of the frame</param>
/// <param name="frame">The frame to write</param>
// Revision History
// MM/DD/YY Who Version Issue# Description
// -------- --- ------- ------ -------------------------------------------
// 08/09/11 RCG 2.52.00 Created
public void WriteASHFrameInfo(EZSPLogDirection direction, ASHFrame frame)
{
string Output = "";
if (direction == EZSPLogDirection.Send)
{
Output += "S: ";
}
else
{
Output += "R: ";
}
Output += "- ASH Frame: " + frame.ASHFrameType.ToString() + " - ";
switch (frame.ASHFrameType)
{
case ASHFrame.FrameType.Data:
{
Output += "Frame Number: " + frame.FrameNumber.ToString() + " Ack Number: " + frame.AckNumber.ToString()
+ " Retransmit: " + frame.IsRetransmitted.ToString() + " Data: ";
for (int Index = 0; Index < frame.Data.Length; Index++)
{
Output += frame.Data[Index].ToString("X2") + " ";
}
break;
}
case ASHFrame.FrameType.Ack:
case ASHFrame.FrameType.Nak:
{
Output += "Ack Number: " + frame.AckNumber.ToString() + " Not Ready: " + frame.NotReady.ToString();
break;
}
case ASHFrame.FrameType.Error:
{
Output += "Error Code: ";
for (int Index = 0; Index < frame.Data.Length; Index++)
{
Output += frame.Data[Index].ToString("X2") + " ";
}
break;
}
}
Output += " CRC Valid: " + frame.IsCRCValid.ToString();
WriteLine(EZSPLogLevels.ASHProtocol, Output);
}
/// <summary>
/// Sends the specified data
/// </summary>
/// <param name="data">The data to send</param>
// Revision History
// MM/DD/YY Who Version Issue# Description
// -------- --- ------- ------ -------------------------------------------
// 08/09/11 RCG 2.52.00 Created
public void SendData(byte[] data)
{
if (m_Connected)
{
ASHFrame NewDataFrame = new ASHFrame();
NewDataFrame.ASHFrameType = ASHFrame.FrameType.Data;
NewDataFrame.FrameNumber = m_HostFrameNumber;
NewDataFrame.AckNumber = m_NCPFrameNumber;
NewDataFrame.Data = data;
m_HostFrameNumber = (byte)((m_HostFrameNumber + 1) % 8);
SendFrame(NewDataFrame);
}
else
{
throw new InvalidOperationException("ASH needs to be connected before data can be sent");
}
}
/// <summary>
/// Handles the Data Received event
/// </summary>
/// <param name="sender">The object that sent the event.</param>
/// <param name="e">The event arguments</param>
// Revision History
// MM/DD/YY Who Version Issue# Description
// -------- --- ------- ------ -------------------------------------------
// 08/09/11 RCG 2.52.00 Created
private void m_SerialComm_DataReceived(object sender, EventArgs e)
{
// We received data so we should attempt to read the next frame
if (m_SerialComm.IsOpen)
{
byte[] NewFrameData = null;
do
{
lock (m_SerialComm)
{
NewFrameData = m_SerialComm.ReadNextFrame();
}
if (NewFrameData != null)
{
ASHFrame NewFrame = new ASHFrame(ASHFrame.UnstuffFrame(NewFrameData));
NewFrame.TimeStamp = DateTime.Now;
if (m_Logger != null)
{
m_Logger.WriteASHFrameInfo(EZSPLogDirection.Receive, NewFrame);
}
if (m_Resetting)
{
// Ignore everything but the reset Ack
if (NewFrame.ASHFrameType == ASHFrame.FrameType.ResetAck)
{
// The Reset method should be looking for this response so add it to the list of received frames
m_ReceivedFrames.Add(NewFrame);
}
}
else
{
switch (NewFrame.ASHFrameType)
{
case ASHFrame.FrameType.Data:
{
// Check to make sure that the CRC is valid and that the frame number is correct
if (NewFrame.IsCRCValid && NewFrame.FrameNumber == m_NCPFrameNumber)
{
ASHFrame AckFrame = new ASHFrame();
AckFrame.ASHFrameType = ASHFrame.FrameType.Ack;
AckFrame.AckNumber = (byte)((NewFrame.FrameNumber + 1) % 8);
// Send the ack
SendFrame(AckFrame);
m_NCPFrameNumber = (byte)((m_NCPFrameNumber + 1) % 8);
// Add the data frame and notify
m_ReceivedFrames.Add(NewFrame);
RemoveAcknowledgedFrames(NewFrame.AckNumber);
OnFrameReceived();
}
else if (NewFrame.IsCRCValid && NewFrame.IsRetransmitted)
{
ASHFrame AckFrame = new ASHFrame();
AckFrame.ASHFrameType = ASHFrame.FrameType.Ack;
AckFrame.AckNumber = NewFrame.FrameNumber;
// Send the ack
SendFrame(AckFrame);
// If the frame currently exists remove it
m_ReceivedFrames.RemoveAll(f => f.FrameNumber == NewFrame.FrameNumber);
// Add the data frame and notify
m_ReceivedFrames.Add(NewFrame);
RemoveAcknowledgedFrames(NewFrame.AckNumber);
OnFrameReceived();
}
else
{
if (m_RejectCondition == false)
{
m_RejectCondition = true;
ASHFrame NakFrame = new ASHFrame();
NakFrame.ASHFrameType = ASHFrame.FrameType.Nak;
NakFrame.AckNumber = NewFrame.AckNumber;
SendFrame(NakFrame);
}
}
break;
}
case ASHFrame.FrameType.Ack:
{
// A frame was acknowledged so it should be cleared from the list of pending items
RemoveAcknowledgedFrames(NewFrame.AckNumber);
break;
}
case ASHFrame.FrameType.Nak:
{
// We received a Nak for something sent so we need to retransmit
byte CurrentAckNumber = NewFrame.AckNumber;
while (CurrentAckNumber != m_HostFrameNumber)
{
if (m_SentFrames.Where(f => f.FrameNumber == CurrentAckNumber).Count() > 0)
{
// Update and retransmit the frame
ASHFrame RetransmittedFrame = m_SentFrames.First(f => f.FrameNumber == CurrentAckNumber);
RetransmittedFrame.IsRetransmitted = true;
SendFrame(RetransmittedFrame);
}
CurrentAckNumber = (byte)((CurrentAckNumber + 1) % 8);
}
break;
}
case ASHFrame.FrameType.Error:
{
// Errors are fatal meaning this sessions is now over
m_LastError = NewFrame.Data[1];
Disconnect();
break;
}
default:
{
// We should not be receiving Resets or Reset Acks now this should be considered an error
Disconnect();
break;
}
}
}
}
} while (NewFrameData != null);
}
}
/// <summary>
/// Resets the NCP.
/// </summary>
/// <returns>True if the reset was successful. False otherwise.</returns>
// Revision History
// MM/DD/YY Who Version Issue# Description
// -------- --- ------- ------ -------------------------------------------
// 08/09/11 RCG 2.52.00 Created
private bool Reset()
{
bool HasReset = false;
int RetryAttempt = 0;
DisableSlip();
while (HasReset == false && RetryAttempt < RESET_RETRIES)
{
SendCancel();
Thread.Sleep(10);
SendCancel();
Thread.Sleep(10);
SendCancel();
Thread.Sleep(10);
// Clear any data we may have received
m_SerialComm.ClearBuffer();
// Send the Reset Frame
ASHFrame ResetFrame = new ASHFrame();
ResetFrame.ASHFrameType = ASHFrame.FrameType.Reset;
m_Resetting = true;
SendFrame(ResetFrame);
// Wait for the Reset Ack
while ((DateTime.Now - ResetFrame.TimeStamp).TotalMilliseconds < T_RSTACK_MAX)
{
if (m_ReceivedFrames.Where(f => f.ASHFrameType == ASHFrame.FrameType.ResetAck).Count() > 0)
{
// We received the Reset Ack
HasReset = true;
m_Resetting = false;
// Clear the received items
m_ReceivedFrames.Clear();
break;
}
else
{
// We are still waiting for the ack
Thread.Sleep(25);
}
}
if (HasReset == false)
{
// Haven't found it so we will need to retry
RetryAttempt++;
}
}
if (HasReset)
{
// Send an Ack to indicate we are good to go
ASHFrame AckFrame = new ASHFrame();
AckFrame.ASHFrameType = ASHFrame.FrameType.Ack;
SendFrame(AckFrame);
}
return(HasReset);
}
