/// <summary>
/// Generate the command frame
/// </summary>
/// <param name="command">command</param>
/// <param name="parameters">parameters</param>
/// <returns>commmand frame byte array</returns>
private byte[] GenerateCommandFrame(ePaperCommand command, byte[] parameters)
{
int frameLength = ePaper.FrameHeaderSegment_Length + ePaper.FrameLengthSegment_Length + ePaper.CommandTypeSegment_Length + parameters.Length + ePaper.FrameEndSegment_Length + ePaper.FrameParitySegment_Length;
MemoryStream stream = new MemoryStream();
using (BinaryWriter writer = new BinaryWriter(stream))
{
writer.Write(ePaper.Frame_Header);
byte[] frameLengthBytes = BitConverter.GetBytes((short)frameLength);
writer.Write(frameLengthBytes[1]);
writer.Write(frameLengthBytes[0]);
writer.Write((byte)command);
if (parameters.Length > 0)
{
writer.Write(parameters);
}
writer.Write(ePaper.Frame_End);
byte[] frame = stream.ToArray();
byte parity = GenerateParity(frame);
writer.Write(parity);
}
return(stream.ToArray());
}
/// <summary>
/// Send command to e-Paper
/// </summary>
/// <param name="command">Command</param>
/// <param name="parameters">Parameters</param>
/// <returns>Result from e-Paper</returns>
private async Task <string> SendCommand(ePaperCommand command, byte[] parameters)
{
string rxBuffer;
byte[] commandFrame = GenerateCommandFrame(command, parameters);
DataWriter dw = new DataWriter(this.serial.OutputStream);
try
{
dw.WriteBytes(commandFrame);
await dw.StoreAsync();
}
catch (Exception e)
{
throw new ePaperException(ePaperExceptionCode.Unknow, e.Message);
}
finally
{
dw.DetachStream();
dw = null;
}
const uint maxReadLength = 32;
DataReader dr = new DataReader(this.serial.InputStream);
try
{
uint bytesToRead = await dr.LoadAsync(maxReadLength);
rxBuffer = dr.ReadString(bytesToRead);
}
catch (Exception e)
{
throw new ePaperException(ePaperExceptionCode.Unknow, e.Message);
}
finally
{
dr.DetachStream();
dr = null;
}
System.Diagnostics.Debug.WriteLine(command.ToString() + " return:" + rxBuffer);
return(rxBuffer);
}
/// <summary>
/// Send command
/// </summary>
/// <param name="command">command</param>
/// <returns>return from e-Paper</returns>
private async Task <string> SendCommand(ePaperCommand command)
{
return(await SendCommand(command, new byte[0]));
}
