/// <summary>
/// Read a single message
/// </summary>
protected byte[] ReadMessage(ReplyLength replyLength, int fixedReplyLength)
{
if (port == null)
{
return(new byte[0]);
}
return(ReadMessage(port, replyLength, fixedReplyLength));
}
/// <summary>
/// Read a single message
/// </summary>
private static byte[] ReadMessage(SerialPort port, ReplyLength replyLength, int fixedReplyLength)
{
// Try to read the message
switch (replyLength)
{
case ReplyLength.Fixed:
{
var data = new byte[fixedReplyLength];
Read(port, data, 0, fixedReplyLength);
return(data);
}
case ReplyLength.Bit7:
{
var data = new byte[1];
var offset = 0;
while (true)
{
Read(port, data, offset, 1);
if ((data[offset] & 0x80) == 0)
{
return(data);
}
var oldData = data;
data = new byte[data.Length + 1];
Array.Copy(oldData, data, oldData.Length);
offset++;
}
}
case ReplyLength.FirstByte:
{
var data = new byte[1];
// Read first byte
Read(port, data, 0, 1);
// Read bytes that follow
data = new byte[data[0]];
if (data.Length > 0)
{
Read(port, data, 0, data.Length);
}
return(data);
}
default:
throw new ArgumentException("unknown ReplyLength");
}
}
protected byte[] Transaction(byte[] msg, ReplyLength replyLength, int fixedReplyLength)
{
Idle = false;
var port = Open();
try
{
flushAvailableData(port);
Send(port, msg, msg.Length);
return(ReadMessage(port, replyLength, fixedReplyLength));
}
catch
{
Close();
throw;
}
}
