/// <summary>
/// Write data to GPIOBoard
/// </summary>
/// <param name="SlaveID">GPIOBoard Station ID</param>
/// <param name="FrameType">Frame type</param>
/// <param name="Data">Transmitted data</param>
/// <returns></returns>
public async Task <byte[]> GPIOWriteAsync(byte SlaveID, byte FrameType, byte[] Data)
{
try
{
await Writelock.WaitAsync();
if (IsOpen())
{
int Retry = MAXRETRY;
List <byte> Frame = new List <byte> {
SlaveID, FrameType
};
if (Data != null)
{
Frame.AddRange(Data);
}
Frame.AddRange(SerialHelper.CalcCRC(Frame.ToArray()));
Frame.Insert(0, HEADER[0]);
Frame.Insert(1, HEADER[1]);
Frame.AddRange(TAIL);
while (Retry > 0)
{
await WriteAsync(Frame.ToArray());
byte[] ReceivedBytes;
ReceivedBytes = await ReadAsync();
if (ReceivedBytes != null)
{
if (ParseResponde(SlaveID, FrameType, ReceivedBytes))
{
return(ReceivedBytes);
}
}
//await Serial.WriteAsync(Frame.ToArray());
await Task.Delay(20);
DiscardInBuffer();
Retry--;
}
return(null);
}
throw new Exception("COM Port has been closed");
}
catch (Exception ex)
{
string s = ex.Message;
return(null);
}
finally
{
Writelock.Release();
}
}
private bool CRC16ErrorCheck(byte[] Data)
{
if (Data.Count() < 2)
{
return(false);
}
try
{
int Count = Data.Length;
byte HighCRC = Data[Count - 1];
byte LowCRC = Data[Count - 2];
byte[] data = new byte[Count - 2];
Array.Copy(Data, 0, data, 0, Count - 2);
var CalculatedCRC = SerialHelper.CalcCRC(data);
return(HighCRC == CalculatedCRC[1] && LowCRC == CalculatedCRC[0]);
}
catch (Exception)
{
throw;
}
}