private const int Receiving_Max_Data_Length_UsbToPc = 512; //(0xff); //not whole structure Length, only Data buffer Length
/* USB_CDC_Transmit_Packet
* struct USB_CDC_Transmit_Packet
* {
* private const byte LeadingCode = CDC_LeadingCode; //起始字元
* private const byte SlAdd = CDC_SlaveAddressCode; //Slave Address
* public byte command; //命令
* private byte DataLenExpected_low;//數據長度,
* private byte DataLenExpected_high;//數據長度,
* [MarshalAs(UnmanagedType.ByValArray, SizeConst=CDC_Transmitting_Max_Data_Length)]
* private byte[] DataBuf;//數據內容
* private byte LRCDataLow; //checkSum16 Low byte, included slave address, command, length and data.
* private byte LRCDataHigh; //checkSum16 High byte, included slave address, command, length and data.
* private const byte cEND1 = CDC_EndingCode1;//結束字元 1
* private const byte cEND2 = CDC_EndingCode2;//結束字元 2
* }*/
public static byte[] Packing(byte TransmittedCmd, byte[] TransmittedParameter)
{
byte[] TempData;
List <byte> TransmitData = new List <byte>();
UInt16 LenExpected;
//if (TransmittedCmd == 0x92)
//{
// LenExpected = 0;
//}
if (TransmittedParameter.Length > Transmitting_Max_Data_Length_PcToUSB)
{
throw new Exception("The size of Transmitted Parameter must be less than or equal to " + Transmitting_Max_Data_Length_PcToUSB);
//LenExpected = Transmitting_Max_Data_Length_PcToUSB;
//TempData = new byte[LenExpected];
//for (UInt16 i = 0; i < LenExpected; i++)
//{
// TempData[i] = Transmit_Parameter[i];
//}
}
else
{
LenExpected = (UInt16)TransmittedParameter.Length;
TempData = (byte[])TransmittedParameter.Clone();
}
TransmitData.Add(SlaveAddressCode);
TransmitData.Add(TransmittedCmd);
TransmitData.Add((byte)LenExpected);
TransmitData.Add((byte)(LenExpected >> 8));
TransmitData.AddRange(TempData);
byte[] CheckBuffer = TransmitData.ToArray <Byte>();
ushort checkSum = MassUtilities.ComputeCheckSum16(CheckBuffer);
TransmitData.Add((byte)(checkSum)); // low byte //4 to last byte for packet
TransmitData.Add((byte)(checkSum >> 8)); // high byte //3 to last byte for packet
TransmitData.Add(EndingCode1); //2 to last byte for packet
TransmitData.Add(EndingCode2); //last byte for packet
TransmitData.Insert(0, LeadingCode); // add first Item
return(TransmitData.ToArray <Byte>());
}
//========Transmiting Data Structure===========================
//typedef struct{
// static char cStart = 0X3A; //起始字元
// unsigned char 0X16; //Slave Address
// unsigned char Command; //應回應的命令
// unsigned char LenExpected; //數據長度
// unsigned char DataBuf[DATA_BUF_NUM];//數據內容
// unsigned char LRCDataLow; //checkSum with slave Low byte, included slave address, command, length and data.
// unsigned char LRCDataHigh; //checkSum with slave High byte, included slave address, command, length and data.
// static char cEND1= 0X0D; //結束字元 1
// static char cEND1= 0X0A; //結束字元 2
//} LEV Protocol Packet;
public static byte[] Packing(byte TransmittedCmd, byte[] TransmittedParameter)
{
List <byte> TransmitData = new List <byte>();
byte LenExpected = (byte)TransmittedParameter.Length;
TransmitData.Add(SlaveAddressCode);
TransmitData.Add(TransmittedCmd);
TransmitData.Add(LenExpected);
TransmitData.AddRange(TransmittedParameter);
byte[] CheckBuffer = TransmitData.ToArray <Byte>();
ushort checkSum = MassUtilities.ComputeCheckSum16(CheckBuffer);
TransmitData.Add((byte)(checkSum)); // low byte //4 to last byte for packet
TransmitData.Add((byte)(checkSum >> 8)); // high byte //3 to last byte for packet
TransmitData.Add(EndCode1); //2 to last byte for packet
TransmitData.Add(EndCode2); //last byte for packet
TransmitData.Insert(0, LeadingCode); // add first Item
return(TransmitData.ToArray <Byte>());
}
public static bool Unpacking(byte[] ReceivedRawData, out byte ReceivedCommand, out byte[] ReceivedParameter, out int segStartIdxOfRawData, out int segEndIdxOfRawData)
{
bool IsFound_Packet_Form = false;
segStartIdxOfRawData = 0;
segEndIdxOfRawData = 0;
ReceivedCommand = 0;
ReceivedParameter = new byte[0];
List <byte> ReceivedDataList = new List <byte>();
int startFormIndex;
int dataLength, endCode1_idx, endCode2_idx;
if (ReceivedRawData.Length < 2)
{
return(IsFound_Packet_Form);
}
for (int i = 0; i < (ReceivedRawData.Length - 1); i++)
{
//finding leading codes
if ((ReceivedRawData[i] == LeadingCode) && (ReceivedRawData[i + 1] == SlaveAddressCode))
{
startFormIndex = i;
if ((startFormIndex + 4) >= ReceivedRawData.Length)
{
return(IsFound_Packet_Form);
}
dataLength = (ReceivedRawData[startFormIndex + 4] << 8) + ReceivedRawData[startFormIndex + 3]; //offset 3 to get receiving data length low, offset 4 to get receiving data length high
endCode1_idx = startFormIndex + 4 + dataLength + 2 + 1; //add offset 2 is two of Cuecksum bytes
endCode2_idx = startFormIndex + 4 + dataLength + 2 + 2; //add offset 2 is two of Cuecksum bytes
if (endCode2_idx >= ReceivedRawData.Length)
{
return(IsFound_Packet_Form);
}
//finding Ending Codes
if ((ReceivedRawData[endCode1_idx] == EndingCode1) && (ReceivedRawData[endCode2_idx] == EndingCode2))
{
//calculate checkSum
byte[] CheckBuffer = new byte[dataLength + 4]; //included slave address, command, length and data.
Array.Copy(ReceivedRawData, startFormIndex + 1, CheckBuffer, 0, CheckBuffer.Length);
ushort checkSum = MassUtilities.ComputeCheckSum16(CheckBuffer);
int checkSumLowByte_Index = endCode1_idx - 2;
int checkSumHighByte_Index = checkSumLowByte_Index + 1;
if (ReceivedRawData[checkSumLowByte_Index] == ((byte)(checkSum)) && ReceivedRawData[checkSumHighByte_Index] == ((byte)(checkSum >> 8)))
{
//Save data to structure
ReceivedCommand = ReceivedRawData[startFormIndex + 2];
for (int j = 0; j < dataLength; j++)
{
ReceivedDataList.Add(ReceivedRawData[startFormIndex + 5 + j]);
}
segStartIdxOfRawData = startFormIndex;
segEndIdxOfRawData = startFormIndex + 5 + dataLength - 1;
IsFound_Packet_Form = true;
break;
}
} //if((ReceivingData[endCode1_idx] == EndingCode1) && (ReceivingData[endCode2_idx] == EndingCode2)){
} //if((ReceivingData[i] == LeadingCode) && (ReceivingData[i+1] == SlaveAddressCode)){
} //for(int i = 0; i < (ReceivingData.Length - 1); i++){
if (IsFound_Packet_Form)
{
ReceivedParameter = ReceivedDataList.ToArray <byte>();
}
return(IsFound_Packet_Form);
}