public List <DataParameter> ProcessFrame(byte[] dataFrame)
{
List <DataParameter> dataList = new List <DataParameter>();
const byte I2C_CONTROL_CHAR = 0xD5;
const byte I2C_FRAME_START = 0xD0;
const byte I2C_PARAMETER_START = 0xD3;
const byte I2C_FRAME_END = 0xD8;
int length = dataFrame.Length;
//Check the start and end headers
if (dataFrame.Length > 7 && dataFrame[0] != I2C_CONTROL_CHAR || dataFrame[1] != I2C_FRAME_START || dataFrame[length - 4] != I2C_CONTROL_CHAR || dataFrame[length - 3] != I2C_FRAME_END)
{
return(dataList);
}
int i = 0;
int checksum = 0;
for (i = 0; i < length - 4; i++)
{
checksum ^= dataFrame[i];
checksum &= 0xFF;
}
if (dataFrame[length - 2] != checksum)
{
return(dataList);
}
else
{
} //All good, continue on
//Shorten any escaped data now that we've isolated a single frame
for (i = 2; i < length - 1; i++)
{
if (dataFrame[i] == I2C_CONTROL_CHAR && dataFrame[i + 1] == I2C_CONTROL_CHAR)
{
int x;
for (x = i + 1; x < length - 1; x++)
{
dataFrame[x] = dataFrame[x + 1];
}
dataFrame[length - 1] = 0x00;
}
else
{
} //no escaped data here, continue on.
}
int position = 4;
while (position < length)
{
if (dataFrame[position] == 0xD5)
{
position++;
switch (dataFrame[position])
{
case I2C_PARAMETER_START:
{
position++;
int dataType = dataFrame[position] & 0x0F;
int dataSize = (dataFrame[position] & 0xF0) / 16;
DataParameter p = new DataParameter();
p.Index = (UInt16)(dataFrame[position + 1] * 256 + dataFrame[position + 2]);
byte[] dataBytes = dataFrame.Skip(position + 3).Take(dataSize).ToArray();
switch (dataFrame[position])
{
case 0x11: //int 8
p.Data = (sbyte)(dataFrame[position + 3]);
break;
case 0x12: //uint 8
p.Data = dataFrame[position + 3];
break;
case 0x21: //int 16
dataBytes = dataBytes.Reverse().ToArray();
p.Data = BitConverter.ToInt16(dataBytes, 0);
break;
case 0x22: //uint 16
dataBytes = dataBytes.Reverse().ToArray();
p.Data = BitConverter.ToUInt16(dataBytes, 0);
break;
case 0x41: //int 32
dataBytes = dataBytes.Reverse().ToArray();
p.Data = BitConverter.ToInt32(dataBytes, 0);
break;
case 0x42: //uint 32
dataBytes = dataBytes.Reverse().ToArray();
p.Data = BitConverter.ToUInt32(dataBytes, 0);
break;
case 0x81: //int 64
dataBytes = dataBytes.Reverse().ToArray();
p.Data = BitConverter.ToInt64(dataBytes, 0);
break;
case 0x82: //uint 64
dataBytes = dataBytes.Reverse().ToArray();
p.Data = BitConverter.ToUInt64(dataBytes, 0);
break;
case 0x43: //float
dataBytes = dataBytes.Reverse().ToArray();
p.Data = BitConverter.ToSingle(dataBytes, 0);
break;
case 0x83: //double
dataBytes = dataBytes.Reverse().ToArray();
p.Data = BitConverter.ToDouble(dataBytes, 0);
break;
}
dataList.Add(p);
position += dataSize + 3;
}
break;
}
}
else
{
//Should report an error
position++;
}
}
return(dataList);
}
private void sendTestData_Click(object sender, EventArgs e)
{
if (listBox1.SelectedIndex < 0)
{
MessageBox.Show("Choose a node from the list.");
return;
}
List <DataParameter> paramsToSend = new List <DataParameter>();
UInt16 index;
object value = null;
UInt16.TryParse(testDataIndexTxt.Text, out index);
switch (testDataType.SelectedIndex)
{
case 0: sbyte sbyteVal;
if (!sbyte.TryParse(testDataToSendTxt.Text, out sbyteVal))
{
goto error;
}
value = sbyteVal;
break;
case 1: byte byteVal;
if (!byte.TryParse(testDataToSendTxt.Text, out byteVal))
{
goto error;
}
value = byteVal;
break;
case 2: Int16 int16Val;
if (!Int16.TryParse(testDataToSendTxt.Text, out int16Val))
{
goto error;
}
value = int16Val;
break;
case 3: UInt16 uint16Val;
if (!UInt16.TryParse(testDataToSendTxt.Text, out uint16Val))
{
goto error;
}
value = uint16Val;
break;
case 4: Int32 Int32Val;
if (!Int32.TryParse(testDataToSendTxt.Text, out Int32Val))
{
goto error;
}
value = Int32Val;
break;
case 5: UInt32 UInt32Val;
if (!UInt32.TryParse(testDataToSendTxt.Text, out UInt32Val))
{
goto error;
}
value = UInt32Val;
break;
case 6: Int64 Int64Val;
if (!Int64.TryParse(testDataToSendTxt.Text, out Int64Val))
{
goto error;
}
value = Int64Val;
break;
case 7: UInt64 UInt64Val;
if (!UInt64.TryParse(testDataToSendTxt.Text, out UInt64Val))
{
goto error;
}
value = UInt64Val;
break;
case 8: float floatVal;
if (!float.TryParse(testDataToSendTxt.Text, out floatVal))
{
goto error;
}
value = floatVal;
break;
case 9: double doubleVal;
if (!double.TryParse(testDataToSendTxt.Text, out doubleVal))
{
goto error;
}
value = doubleVal;
break;
}
DataParameter p = new DataParameter();
p.Index = index;
p.Data = value;
paramsToSend.Add(p);
if (!net.setParameters(listBox1.SelectedItem.ToString(), paramsToSend))
{
MessageBox.Show("There was an error sending the message.");
}
return;
error:
MessageBox.Show("Coud not parse one of the fields.");
}