| public ComputeChecksumBytes ( byte bytes ) : byte[] | ||
| bytes | byte | |
| return | byte[] | |
private void Build()
{
Crc16Ccitt crc = new Crc16Ccitt(InitialCrcValue.Zeros);
List <byte> tt = new List <byte>();
tt.Add(m_start_byte);
tt.Add(0x00); //length place holder
tt.Add(0x00); //length place holder
tt.Add((byte)((m_source_address << 5) | (m_destination_address << 2) | m_protocol_code));
tt.Add(m_command);
if (m_data != null)
{
foreach (byte b in m_data)
{
tt.Add(b);
}
}
tt.Add(0x00); //checksum place holder
tt.Add(0x00); //checksum place holder
m_telegram = tt.ToArray();
byte[] ba = BitConverter.GetBytes((UInt16)(tt.Count - 3)); //excludes start and length bytes
m_telegram[1] = ba[0]; //length
m_telegram[2] = ba[1]; //length
byte[] crc_v = crc.ComputeChecksumBytes(m_telegram, 0, m_telegram.Length - 2);
m_telegram[m_telegram.Length - 2] = crc_v[0];
m_telegram[m_telegram.Length - 1] = crc_v[1];
}
//private string GetHex(int intVal)
//{
// //return intVal.ToString("X");
// //return String.Format("{0:X}", intVal);
// var hex = String.Format("{0:X}", intVal);
// if (hex.Length == 1) hex = "0" + hex;
// return hex;
//}
//private byte[] GetTestBufToSend()
//{
// var sendbuf = new byte[31];
// sendbuf[0] = 192;
// sendbuf[1] = 168;
// sendbuf[2] = 1;
// sendbuf[3] = 15;
// sendbuf[4] = 72;
// sendbuf[5] = 68;
// sendbuf[6] = 76;
// sendbuf[7] = 77;
// sendbuf[8] = 73;
// sendbuf[9] = 82;
// sendbuf[10] = 65;
// sendbuf[11] = 67;
// sendbuf[12] = 76;
// sendbuf[13] = 69;
// sendbuf[14] = 170; // Leading code
// sendbuf[15] = 170; // Leading code
// sendbuf[16] = 15; // Length of data package
// sendbuf[17] = 1; // Original subnet id
// sendbuf[18] = 23; // Original device id
// sendbuf[19] = 0; // Original device type
// sendbuf[20] = 149; // Original device type
// sendbuf[21] = 0; // Operate code
// sendbuf[22] = 49; // Operate code
// sendbuf[23] = 1; // Target subnet id
// sendbuf[24] = 74; // Target device id
// sendbuf[25] = 1; // content
// sendbuf[26] = 40; // content
// sendbuf[27] = 0; // content
// sendbuf[28] = 3; // content
// sendbuf[29] = 191; // CRC H
// sendbuf[30] = 29; // CRC L
// return sendbuf;
//}
private byte[] BuildBufToSend(int targetSubnetId, int targetDeviceId, byte[] operateCode, byte[] content,
int senderSubnetId, int senderDeviceId, byte[] senderDeviceType)
{
var length = 25 + content.Length + 2;
var sendbuf = new byte[length];
// Fixed header
sendbuf[0] = 192; // 192
sendbuf[1] = 168; // 168
sendbuf[2] = 1; // 1
sendbuf[3] = 15; // 15
sendbuf[4] = 72; // H
sendbuf[5] = 68; // D
sendbuf[6] = 76; // L
sendbuf[7] = 77; // M
sendbuf[8] = 73; // I
sendbuf[9] = 82; // R
sendbuf[10] = 65; // A
sendbuf[11] = 67; // C
sendbuf[12] = 76; // L
sendbuf[13] = 69; // E
// Fixed leading code
sendbuf[14] = 0xAA;
sendbuf[15] = 0xAA;
var lengthOfDataPackage = 11 + content.Length;
sendbuf[16] = (byte)lengthOfDataPackage; // 15 Length of data package
sendbuf[17] = (byte)senderSubnetId; // 1 Original subnet id
sendbuf[18] = (byte)senderDeviceId; // 23 Original device id
sendbuf[19] = senderDeviceType[0]; // 0 Original device type
sendbuf[20] = senderDeviceType[1]; // 149 Original device type
sendbuf[21] = operateCode[0]; // 0 Operate code
sendbuf[22] = operateCode[1]; // 49 Operate code
sendbuf[23] = (byte)targetSubnetId; // 1 Target subnet id
sendbuf[24] = (byte)targetDeviceId; // 74 Target device id
for (int i = 0; i < content.Length; i++)
{
sendbuf[i + 25] = content[i]; // 1 content
}
var crcBufLength = lengthOfDataPackage - 2;
var crcBuf = new byte[crcBufLength];
for (int i = 0; i < crcBufLength; i++)
{
crcBuf[i] = sendbuf[16 + i];
}
var crc = new Crc16Ccitt(0);
var res = crc.ComputeChecksumBytes(crcBuf);
sendbuf[sendbuf.Length - 2] = res[1];
sendbuf[sendbuf.Length - 1] = res[0];
return(sendbuf);
}
private void sendYmodemClosingPacket(byte STX, int packetNumber, int invertedPacketNumber, byte[] data, int dataSize, byte[] CRC, int crcSize)
{
/* calculate CRC */
Crc16Ccitt crc16Ccitt = new Crc16Ccitt(InitialCrcValue.Zeros);
CRC = crc16Ccitt.ComputeChecksumBytes(data);
/* send the packet */
sendYmodemPacket(STX, packetNumber, invertedPacketNumber, data, dataSize, CRC, crcSize);
}
static async Task TestGenerateCrc16Code()
{
var code = "00020101021226850014br.gov.bcb.pix2563pix.santander.com.br/qr/v1/1edc73e3-cb6b-420e-a43a-00cfdde3288b520400005303986540520.005802BR5925DANILO NOVAIS DE OLIVEIRA6009SAO PAULO62070503***6304";
var crcGenerator = new Crc16Ccitt(InitialCrcValue.NonZero1);
var codeArray = Encoding.ASCII.GetBytes(code);
var result = crcGenerator.ComputeChecksumBytes(codeArray);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(result);
}
var strResult = BitConverter.ToString(result);
await Task.CompletedTask;
}
/// <summary>
/// Builds up a message packet from the payload passed across. The payload is modified by this method.
/// </summary>
/// <param name="payload"></param>
/// <param name="isFirstMessage"></param>
/// <returns></returns>
private List <byte> BuildValidMessagePacket(List <byte> payload, bool isFirstMessage = true)
{
var checksumCalculator = new Crc16Ccitt(Crc16Ccitt.InitialiseToZero);
var checksum = AddDCEStuffing(new List <byte>(checksumCalculator.ComputeChecksumBytes(payload.ToArray(), false)));
var result = new List <byte>();
if (isFirstMessage)
{
result.Add(0x00); // prefix with a leading byte so that the listener will not reject it
}
result.Add(0x10);
result.Add(0x02);
result.AddRange(AddDCEStuffing(payload));
result.Add(0x10);
result.Add(0x03);
result.AddRange(checksum);
return(result);
}
private (byte CrcLow, byte CrcHigh) CalculateChecksum(byte[] sendbuf)
{
const int indexLengthOfDataPackage = 16;
int lengthOfDataPackage = sendbuf[indexLengthOfDataPackage];
var crcBufLength = lengthOfDataPackage - 2;
var crcBuf = new byte[crcBufLength];
for (var i = 0; i < crcBufLength; i++)
{
crcBuf[i] = sendbuf[16 + i];
}
var crc = new Crc16Ccitt(0);
var checksum = crc.ComputeChecksumBytes(crcBuf);
var crcHigh = checksum[1];
var crcLow = checksum[0];
return(CrcLow : crcLow, CrcHigh : crcHigh);
}
public static ArduinoI2CResponse VerifyIncomingData(byte[] bData)
{
try
{
Int16 sizeData = bData[0];
int size = sizeData + 4;
if (bData[1] != 2)
{
throw new Exception("To nie jest typ Response");
}
byte lo = bData[size - 2];
byte hi = bData[size - 1];
byte[] crcData = new byte[size - 2];
Buffer.BlockCopy(bData, 0, crcData, 0, size - 2);
Crc16Ccitt crc = new Crc16Ccitt(InitialCrcValue.NonZero1);
Debug.WriteLine("CRC: " + crc.ComputeChecksum(crcData));
var retByte = crc.ComputeChecksumBytes(crcData);
if (!((retByte[0] == lo) && retByte[1] == hi))
{
throw new Exception("B³ad przesy³u danych! B³ad CRC");
}
byte[] Data = new byte[size - 4];
Buffer.BlockCopy(bData, 2, Data, 0, sizeData);
return((ArduinoI2CResponse)GetObjectFromBytes(Data, typeof(ArduinoI2CResponse)));
}
catch (Exception ex)
{
string val = String.Join(",", bData);
LoggerFactory.LogException(ex, "VerifyIncomingData", new { val });
return(new ArduinoI2CResponse {
Status = (int)I2CResponseStatus.Error
});
}
}
private void sendYmodemInitialPacket(byte STX, int packetNumber, int invertedPacketNumber, byte[] data, int dataSize, string path, FileStream fileStream, byte[] CRC, int crcSize)
{
string fileName = System.IO.Path.GetFileName(path);
string fileSize = fileStream.Length.ToString();
/* add filename to data */
int i;
for (i = 0; i < fileName.Length && (fileName.ToCharArray()[i] != 0); i++)
{
data[i] = (byte)fileName.ToCharArray()[i];
}
data[i] = 0;
/* add filesize to data */
int j;
for (j = 0; j < fileSize.Length && (fileSize.ToCharArray()[j] != 0); j++)
{
data[(i + 1) + j] = (byte)fileSize.ToCharArray()[j];
}
data[(i + 1) + j] = 0;
/* fill the remaining data bytes with 0 */
for (int k = ((i + 1) + j) + 1; k < dataSize; k++)
{
data[k] = 0;
}
/* calculate CRC */
Crc16Ccitt crc16Ccitt = new Crc16Ccitt(InitialCrcValue.Zeros);
CRC = crc16Ccitt.ComputeChecksumBytes(data);
/* send the packet */
sendYmodemPacket(STX, packetNumber, invertedPacketNumber, data, dataSize, CRC, crcSize);
}
public static byte[] PrepareMessageToSend(I2CMessageFrame message)
{
byte[] mahByteArray = message.ToArray();
byte[] crcFrame = new byte[Buffer.ByteLength(mahByteArray) + 2];
byte[] bFrame = new byte[Buffer.ByteLength(mahByteArray) + 4];
try
{
crcFrame[0] = (byte)Buffer.ByteLength(mahByteArray);
crcFrame[1] = (byte)1;
Buffer.BlockCopy(mahByteArray, 0, crcFrame, 2, Buffer.ByteLength(mahByteArray));
Crc16Ccitt crc = new Crc16Ccitt(InitialCrcValue.NonZero1);
var retByte = crc.ComputeChecksumBytes(crcFrame);
Buffer.BlockCopy(crcFrame, 0, bFrame, 0, crcFrame.Count());
Buffer.SetByte(bFrame, Buffer.ByteLength(bFrame) - 1, retByte[1]);
Buffer.SetByte(bFrame, Buffer.ByteLength(bFrame) - 2, retByte[0]);
}
catch (Exception ex)
{
LoggerFactory.LogException(ex, "PrepareMessageToSend", new { message });
}
return(bFrame);
}
/*
* Upload file via Ymodem protocol to the device
* ret: is the transfer succeeded? true is if yes
*/
public bool YmodemUploadFile(string path)
{
/* control signals */
const byte STX = 2; // Start of TeXt
const byte EOT = 4; // End Of Transmission
const byte ACK = 6; // Positive ACknowledgement
const byte C = 67; // capital letter C
const byte NACK = 21; // NACK
/* sizes */
const int dataSize = 1024;
const int crcSize = 2;
/* THE PACKET: 1029 bytes */
/* header: 3 bytes */
// STX
int packetNumber = 0;
int invertedPacketNumber = 255;
/* data: 1024 bytes */
byte[] data = new byte[dataSize];
/* footer: 2 bytes */
byte[] CRC = new byte[crcSize];
/* get the file */
FileStream fileStream = new FileStream(@path, FileMode.Open, FileAccess.Read);
try
{
{
int read_byte;
int backup_byte = 9;
int count = _serialPort.BytesToRead;
Console.WriteLine("#####Read byte{0}:", count);
for (int i = 0; i < count; i++)
{
read_byte = _serialPort.ReadByte();
if (i == 0)
{
backup_byte = read_byte;
}
Console.WriteLine("[{0:X}]", read_byte);
}
}
/* send the initial packet with filename and filesize */
if (67 != C)
{
Console.WriteLine("Can't begin the transfer.");
return(false);
}
{
byte[] data1 = new byte[128];
/* footer: 2 bytes */
byte[] CRC1 = new byte[crcSize];
sendYmodemInitialPacket(0x01, 0, invertedPacketNumber, data1, 128, path, fileStream, CRC1, crcSize);
}
//sendYmodemInitialPacket(STX, packetNumber, invertedPacketNumber, data, dataSize, path, fileStream, CRC, crcSize);
Thread.Sleep(200);
// int read_byte;
// int backup_byte = 9;
// int count = _serialPort.BytesToRead;
//
// Console.WriteLine("#####Read byte{0}:", count);
// for (int i = 0; i < count; i++)
// {
// read_byte = _serialPort.ReadByte();
// if (i == 0)
// {
// backup_byte = read_byte;
// }
// Console.WriteLine("[{0:X}]", read_byte);
// }
//
//
// //if (_serialPort.ReadByte() != ACK)
if (_serialPort.ReadByte() != ACK)
{
Console.WriteLine("Can't send the initial packet.");
return(false);
}
if (_serialPort.ReadByte() != C)
{
return(false);
}
/* send packets with a cycle until we send the last byte */
int fileReadCount;
do
{
/* if this is the last packet fill the remaining bytes with 0 */
fileReadCount = fileStream.Read(data, 0, dataSize);
if (fileReadCount == 0)
{
break;
}
if (fileReadCount != dataSize)
{
for (int i = fileReadCount; i < dataSize; i++)
{
data[i] = 0;
}
}
/* calculate packetNumber */
packetNumber++;
if (packetNumber > 255)
{
packetNumber -= 256;
}
Console.WriteLine(packetNumber);
/* calculate invertedPacketNumber */
invertedPacketNumber = 255 - packetNumber;
/* calculate CRC */
Crc16Ccitt crc16Ccitt = new Crc16Ccitt(InitialCrcValue.Zeros);
CRC = crc16Ccitt.ComputeChecksumBytes(data);
/* send the packet */
sendYmodemPacket(STX, packetNumber, invertedPacketNumber, data, dataSize, CRC, crcSize);
/* wait for ACK */
if (_serialPort.ReadByte() != ACK)
{
Console.WriteLine("Couldn't send a packet.");
return(false);
}
if (transmitCb != null)
{
transmitCb(packetNumber);
}
} while (dataSize == fileReadCount);
#region 重构部分
// /* send EOT (tell the downloader we are finished) */
// _serialPort.Write(new byte[] { EOT }, 0, 1);
// /* send closing packet */
// packetNumber = 0;
// invertedPacketNumber = 255;
// data = new byte[dataSize];
// CRC = new byte[crcSize];
// sendYmodemClosingPacket(STX, packetNumber, invertedPacketNumber, data, dataSize, CRC, crcSize);
// /* get ACK (downloader acknowledge the EOT) */
// if (_serialPort.ReadByte() != ACK)
// {
// Console.WriteLine("Can't complete the transfer.");
// return false;
// }
#endregion
/* send EOT (tell the downloader we are finished) */
_serialPort.Write(new byte[] { EOT }, 0, 1);
Thread.Sleep(20);
int back = _serialPort.ReadByte();
if (back != NACK)
{
Console.WriteLine("Can't get NACK. back ={0}", back);
}
_serialPort.Write(new byte[] { EOT }, 0, 1);
Thread.Sleep(20);
int back2 = _serialPort.ReadByte();
if (back2 != ACK)
{
Console.WriteLine("Can't get ACK. back2 ={0}", back2);
}
int back3 = _serialPort.ReadByte();
if (back3 != C)
{
Console.WriteLine("Can't get ACK. back3 ={0}", back3);
}
/* send last packet frame */
byte[] data3 = new byte[128];
byte[] CRC3 = new byte[crcSize];
sendYmodemClosingPacket(0x01, 0x00, 0xff, data3, 128, CRC3, crcSize);
Thread.Sleep(20);
int back4 = _serialPort.ReadByte();
if (back4 != ACK)
{
Console.WriteLine("Can't get ACK. back3 ={0}", back4);
}
}
catch (TimeoutException)
{
throw new Exception("Eductor does not answering");
}
finally
{
fileStream.Close();
}
Console.WriteLine("File transfer is succesful");
return(true);
}
/// <summary>
/// See interface docs.
/// </summary>
/// <param name="bytes"></param>
/// <param name="offset"></param>
/// <param name="bytesRead"></param>
/// <returns></returns>
public IEnumerable <ExtractedBytes> ExtractMessageBytes(byte[] bytes, int offset, int bytesRead)
{
var length = _ReadBufferLength + bytesRead;
if (_ReadBuffer == null || length > _ReadBuffer.Length)
{
var newReadBuffer = new byte[length];
if (_ReadBuffer != null)
{
_ReadBuffer.CopyTo(newReadBuffer, 0);
}
_ReadBuffer = newReadBuffer;
}
Array.ConstrainedCopy(bytes, 0, _ReadBuffer, _ReadBufferLength, bytesRead);
_ReadBufferLength = length;
int startOfPacket = FindDCEMarker(0, 0x02);
if (startOfPacket == 0 && !_SeenFirstPacket)
{
startOfPacket = FindDCEMarker(1, 0x02);
}
int firstByteAfterLastValidPacket = -1;
while (startOfPacket != -1)
{
var endOfPacket = FindDCEMarker(startOfPacket + 2, 0x03);
if (endOfPacket == -1)
{
break;
}
int lengthOfChecksum;
var packetChecksum = ReadChecksum(endOfPacket, out lengthOfChecksum);
if (packetChecksum == null)
{
break;
}
_SeenFirstPacket = true;
firstByteAfterLastValidPacket = endOfPacket + 2 + lengthOfChecksum;
var transponderDataLength = 0;
switch (_ReadBuffer[startOfPacket + 2])
{
case 0x01:
case 0x05: transponderDataLength = 14; break;
case 0x07: transponderDataLength = 7; break;
}
if (transponderDataLength != 0)
{
var dataLength = (endOfPacket - startOfPacket) - 2;
if (_Payload == null || _Payload.Length < dataLength)
{
_Payload = new byte[dataLength];
}
int payloadIndex = 0;
for (int i = startOfPacket + 2; i < endOfPacket; ++i)
{
var b = _ReadBuffer[i];
_Payload[payloadIndex++] = b != 0x10 ? b : _ReadBuffer[++i];
}
if (payloadIndex >= transponderDataLength + 5) // first 5 bytes are packet type / unused / 3-byte rolling timestamp - latter 4 can be DCE stuffed so we can't skip them earlier than this
{
var calculatedChecksum = _ChecksumCalculator.ComputeChecksumBytes(_Payload, 0, payloadIndex, false);
_ExtractedBytes.Bytes = _Payload;
if (calculatedChecksum[0] != packetChecksum[0] || calculatedChecksum[1] != packetChecksum[1])
{
_ExtractedBytes.ChecksumFailed = true;
_ExtractedBytes.Length = _Payload.Length;
}
else
{
_ExtractedBytes.ChecksumFailed = false;
_ExtractedBytes.Offset = 5;
_ExtractedBytes.Length = transponderDataLength;
}
yield return(_ExtractedBytes);
}
}
startOfPacket = FindDCEMarker(firstByteAfterLastValidPacket, 0x02);
}
if (firstByteAfterLastValidPacket != -1)
{
var unusedBytesCount = _ReadBufferLength - firstByteAfterLastValidPacket;
if (unusedBytesCount > 0)
{
if (unusedBytesCount > 0x2800)
{
// We don't want the read buffer growing out of control when reading a source that doesn't contain
// anything that looks like valid messages. I'm not sure how large some of the other packet types
// from SBS-3s are going to be so for now I'm allowing a very generous buffer size.
unusedBytesCount = 0;
}
else
{
for (int si = firstByteAfterLastValidPacket, di = 0; di < unusedBytesCount; ++si, ++di)
{
_ReadBuffer[di] = _ReadBuffer[si];
}
}
}
_ReadBufferLength = unusedBytesCount;
}
}
public static ProtocolFrame AnalyzeQueue(ref Queue <byte> queue)
{
Crc16Ccitt crc = new Crc16Ccitt(InitialCrcValue.Zeros);
ProtocolFramePosition state = ProtocolFramePosition.Start;
ProtocolFrame result = null;
byte[] temp_tel = queue.ToArray();
byte b;
int start_pos = 0;
int number_of_bytes_to_remove = 0;
byte source_address = 0, destination_address = 0, code = 0;
byte command = 0;
UInt16 length_data = 0;
int number_of_bytes_to_read = 0;
List <byte> data = new List <byte>();
UInt16 crcValue = 0;
bool first_checksum_byte = false;
for (int i = 0; i < temp_tel.Length; i++)
{
b = temp_tel[i];
switch (state)
{
case ProtocolFramePosition.Start:
if (b == StartByte)
{
start_pos = i;
state = ProtocolFramePosition.Length;
}
break;
case ProtocolFramePosition.Length:
if ((i - start_pos) == 1)
{
length_data = b;
}
else
{
length_data += (UInt16)(b << 8);
if (length_data >= 4 && length_data <= 200)
{
state = ProtocolFramePosition.Address_and_Code;
number_of_bytes_to_read = length_data - 4;
}
else
{
number_of_bytes_to_remove = i + 1;
i = temp_tel.Length;
}
}
break;
case ProtocolFramePosition.Address_and_Code:
source_address = (byte)((b >> 5) & 0x07);
destination_address = (byte)((b >> 2) & 0x07);
code = (byte)(b & 0x03);
if (destination_address == m_my_address)
{
state = ProtocolFramePosition.Command;
}
else
{
number_of_bytes_to_remove = i + 1;
i = temp_tel.Length;
}
break;
case ProtocolFramePosition.Command:
command = b;
if (length_data > 4)
{
state = ProtocolFramePosition.Data;
}
else
{
state = ProtocolFramePosition.Checksum;
}
break;
case ProtocolFramePosition.Data:
data.Add(b);
number_of_bytes_to_read--;
if (number_of_bytes_to_read == 0)
{
state = ProtocolFramePosition.Checksum;
}
break;
case ProtocolFramePosition.Checksum:
if (first_checksum_byte == false)
{
first_checksum_byte = true;
crcValue = b;
}
else
{
crcValue += (UInt16)(b << 8);
byte[] crc_v = crc.ComputeChecksumBytes(temp_tel, 0, i - 1);
if (crcValue == (UInt16)BitConverter.ToInt16(crc_v, 0))
{
//consider code info
result = new ProtocolFrame(source_address, destination_address, command, code, data.ToArray());
//Checksumme ok
//todo
}
else
{
//Checksumme nicht ok
//todo
}
number_of_bytes_to_remove = i + 1;
}
break;
}
while (number_of_bytes_to_remove > 0)
{
number_of_bytes_to_remove--;
queue.Dequeue();
}
}
return(result);
}
private void sendYmodemInitialPacket(byte STX, int packetNumber, int invertedPacketNumber, byte[] data, int dataSize, string path, FileStream fileStream, byte[] CRC, int crcSize)
{
string fileName = System.IO.Path.GetFileName(path);
string fileSize = fileStream.Length.ToString();
/* add filename to data */
int i;
for (i = 0; i < fileName.Length && (fileName.ToCharArray()[i] != 0); i++)
{
data[i] = (byte)fileName.ToCharArray()[i];
}
data[i] = 0;
/* add filesize to data */
int j;
for (j = 0; j < fileSize.Length && (fileSize.ToCharArray()[j] != 0); j++)
{
data[(i + 1) + j] = (byte)fileSize.ToCharArray()[j];
}
data[(i + 1) + j] = 0;
/* fill the remaining data bytes with 0 */
for (int k = ((i + 1) + j) + 1; k < dataSize; k++)
{
data[k] = 0;
}
/* calculate CRC */
Crc16Ccitt crc16Ccitt = new Crc16Ccitt(InitialCrcValue.Zeros);
CRC = crc16Ccitt.ComputeChecksumBytes(data);
/* send the packet */
sendYmodemPacket(STX, packetNumber, invertedPacketNumber, data, dataSize, CRC, crcSize);
}
private void sendYmodemClosingPacket(byte STX, int packetNumber, int invertedPacketNumber, byte[] data, int dataSize, byte[] CRC, int crcSize)
{
/* calculate CRC */
Crc16Ccitt crc16Ccitt = new Crc16Ccitt(InitialCrcValue.Zeros);
CRC = crc16Ccitt.ComputeChecksumBytes(data);
/* send the packet */
sendYmodemPacket(STX, packetNumber, invertedPacketNumber, data, dataSize, CRC, crcSize);
}
/*
* Upload file via Ymodem protocol to the device
* ret: is the transfer succeeded? true is if yes
*/
public bool YmodemUploadFile(string path)
{
/* control signals */
const byte STX = 2; // Start of TeXt
const byte EOT = 4; // End Of Transmission
const byte ACK = 6; // Positive ACknowledgement
const byte C = 67; // capital letter C
/* sizes */
const int dataSize = 1024;
const int crcSize = 2;
/* THE PACKET: 1029 bytes */
/* header: 3 bytes */
// STX
int packetNumber = 0;
int invertedPacketNumber = 255;
/* data: 1024 bytes */
byte[] data = new byte[dataSize];
/* footer: 2 bytes */
byte[] CRC = new byte[crcSize];
/* get the file */
FileStream fileStream = new FileStream(@path, FileMode.Open, FileAccess.Read);
long totalFileSize = fileStream.Length;
double currentdata = 0;
Console.WriteLine(totalFileSize);
OnProgressChanged((int)((currentdata / totalFileSize) * 100));
try
{
/* send the initial packet with filename and filesize */
if (serialPort.ReadByte() != C)
{
Console.WriteLine("Can't begin the transfer.");
return false;
}
sendYmodemInitialPacket(STX, packetNumber, invertedPacketNumber, data, dataSize, path, fileStream, CRC, crcSize);
if (serialPort.ReadByte() != ACK)
{
Console.WriteLine("Can't send the initial packet.");
return false;
}
if (serialPort.ReadByte() != C)
return false;
/* send packets with a cycle until we send the last byte */
int fileReadCount;
do
{
/* if this is the last packet fill the remaining bytes with 0 */
fileReadCount = fileStream.Read(data, 0, dataSize);
if (fileReadCount == 0) break;
if (fileReadCount != dataSize)
for (int i = fileReadCount; i < dataSize; i++)
data[i] = 0;
/* calculate packetNumber */
packetNumber++;
if (packetNumber > 255)
packetNumber -= 256;
Console.WriteLine(packetNumber);
/* calculate invertedPacketNumber */
invertedPacketNumber = 255 - packetNumber;
/* calculate CRC */
Crc16Ccitt crc16Ccitt = new Crc16Ccitt(InitialCrcValue.Zeros);
CRC = crc16Ccitt.ComputeChecksumBytes(data);
/* send the packet */
sendYmodemPacket(STX, packetNumber, invertedPacketNumber, data, dataSize, CRC, crcSize);
/* wait for ACK */
//is this necessary - no ACK>?!?!?!?!
/*
if (serialPort.ReadByte() != ACK)
{
Console.WriteLine("Couldn't send a packet.");
return false;
}
* */
//update how much data was sent
currentdata = currentdata + dataSize;
OnProgressChanged((int)((currentdata / totalFileSize) * 100));
Console.WriteLine("currentdata");
Console.WriteLine(currentdata);
Console.WriteLine("totalFilesize");
Console.WriteLine(totalFileSize);
Console.WriteLine("percent");
Console.WriteLine((currentdata / totalFileSize));
} while (dataSize == fileReadCount);
/* send EOT (tell the downloader we are finished) */
serialPort.Write(new byte[] { EOT }, 0, 1);
/* send closing packet */
packetNumber = 0;
invertedPacketNumber = 255;
data = new byte[dataSize];
CRC = new byte[crcSize];
sendYmodemClosingPacket(STX, packetNumber, invertedPacketNumber, data, dataSize, CRC, crcSize);
/* get ACK (downloader acknowledge the EOT) */
if (serialPort.ReadByte() != ACK)
{
Console.WriteLine("Can't complete the transfer.");
return false;
}
}
catch (TimeoutException)
{
Console.WriteLine("No Answer - Aborting Transfer");
}
finally
{
fileStream.Close();
}
Console.WriteLine("End transfer Session");
return true;
}
