/// <summary>
/// HDLC注册给底层数据收发外设(UART)的字节接受回调函数
/// </summary>
/// <param name="rxByte">接受的新字节数据</param>
private void Rx1Byte(byte rxByte)
{
// lock the module
// start of frame
if (m_bBusyRevHdlcFrame == false && m_u8LastRxByte == HDLC_FLAG && rxByte != HDLC_FLAG)
{
// I'm now receiving
m_bBusyRevHdlcFrame = true;
// create the HDLC frame
InputOpen();
// add the byte just received
InputWrite(rxByte);
}
// middle of frame
else if (m_bBusyRevHdlcFrame == true && rxByte != HDLC_FLAG)
{
// add the byte just received
InputWrite(rxByte);
if (m_u8InputBufFill + 1 > HDLC_MAX_BUFFER_SIZE)
{
m_u8InputBufFill = 0;
m_bBusyRevHdlcFrame = false;
// input buffer overflow, drop the incoming fram
CommStackLog.RecordErr(enLogLayer.eHdlc, "Rx overflow frame: " + CommStackLog.ToHexString(m_u8aInputBuf, m_u8InputBufFill));
}
}
// end of frame
else if (m_bBusyRevHdlcFrame == true && rxByte == HDLC_FLAG)
{
// finalize the HDLC frame
InputClose();
if (m_u8InputBufFill >= 4)
{
// hand over frame to upper layer
if (m_evHDLCFrameArrived != null)
{
m_evHDLCFrameArrived(m_u8aInputBuf, m_u8InputBufFill);
m_u8InputBufFill = 0;
}
}
m_bBusyRevHdlcFrame = false;
}
m_u8LastRxByte = rxByte;
}
/// <summary>
/// HDLC层发送数据结束
/// </summary>
public void OutputClose()
{
UInt16 u16finalCrc = 0;
u16finalCrc = (UInt16)(~m_u16OutputCrc);
// write the CRC value
OutputWrite((byte)((u16finalCrc >> 0) & 0xFF));
OutputWrite((byte)((u16finalCrc >> 8) & 0xFF));
// write closing HDLC flag
lock (CommStackLog.LockLog)
{
//m_Com.Send(HDLC_FLAG);
m_u8aOutputBuf[m_u8OutputBufFill++] = HDLC_FLAG;
m_Com.SendArr(m_u8aOutputBuf, m_u8OutputBufFill);
CommStackLog.RecordInf(enLogLayer.eHdlc, "Tx: " + CommStackLog.ToHexString(m_u8aOutputPacketBuf, m_u8OutputPacketFill));
}
}
/// <summary>
/// HDLC层接收数据结束
/// </summary>
private void InputClose()
{
lock (CommStackLog.LockLog)
{
if (m_u16InputCrc == HDLC_CRCGOOD)
{
// remove the CRC from the input buffer
m_u8InputBufFill -= 2;
CommStackLog.RecordInf(enLogLayer.eHdlc, "Rx: " + CommStackLog.ToHexString(m_u8aInputBuf, m_u8InputBufFill));
}
else
{
CommStackLog.RecordErr(enLogLayer.eHdlc, "Rx crc error: " + m_u16InputCrc.ToString("X4"));
m_u8InputBufFill = 0;
}
// reset escaping
m_bInputEscaping = false;
}
}
