Using the source for SVL in git, I translated the Python to C#. With that I can still compile for 32-bit windows.
It’s part of our application rather than being a stand alone executable (and it goes from a 6 megabyte EXE to an incremental 4K in our application size).
If anyone wants to use it, here is the contents of the class that implements it:
#region Using
using System;
using System.IO;
using System.IO.Ports;
using System.Threading;
using System.Diagnostics;
#endregion
namespace Artemis
{
#region Enumerations
///
/// Packet command types
///
public enum SVL_Command
{
Error,
Version,
EnterBootloader,
NextFrame,
FirmwareFrame,
ResendFrame,
Done
}
#endregion
///
/// Artemis firmware download
///
public class FirmwareDownload : IDisposable
{
#region Variables
///
/// Which COM port to use
///
public static string ComPort = null;
///
/// The serial port
///
private SerialPort _port = null;
///
/// Name of file to download
///
private string firmwareFile = string.Empty;
public const int OneSecond = 1000;
///
/// Maximum amount of data to send per frame
///
public const int frameSize = 2048;
#endregion
#region Startup/Shutdown
///
/// Protocol constructor
///
private FirmwareDownload(string binary, string comPort)
{
ComPort = comPort;
firmwareFile = binary;
}
///
/// Destructor for Protocol
///
~FirmwareDownload()
{
Dispose();
}
///
/// Perform download
///
public static bool Start(string binary, string comPort)
{
bool rc = false;
FirmwareDownload instance = new FirmwareDownload(binary, comPort);
if (!File.Exists(binary))
Log(“Firmware file does not exist”);
else
rc = instance.Execute();
instance.Dispose();
return rc;
}
///
/// Dispose the object
///
public void Dispose()
{
if (_port != null)
{
_port.RtsEnable = false;
_port.Close();
}
}
#endregion
#region Send/Receive
///
/// Send a message to the Stealth IO boot loader
///
public void SendPacket(SVL_Command cmd, byte data = null, int offset = 0, int length = 0)
{
ushort crc;
int off = 0, dLen = length + 3;
byte packet = new byte[length + 5];
packet[off++] = (byte)(dLen >> 8);
packet[off++] = (byte)dLen;
packet[off++] = (byte)cmd;
Log(string.Format(“Sending {0} Length {1}”, cmd, length));
if (data != null)
for (int i = 0; i < length; i++)
packet[off++] = data[offset++];
crc = CalcCRC(packet, 2, length + 1);
packet[off++] = (byte)(crc >> 8);
packet[off++] = (byte)crc;
_port.Write(packet, 0, packet.Length);
}
///
/// Receive a packet from Stealth IO boot loader
///
/// Number of bytes in packet being received
/// Type of packet
public SVL_Command ReceivePacket(int bytesExpected)
{
try
{
DateTime start = DateTime.Now;
byte packet = new byte[bytesExpected];
while (_port.BytesToRead < bytesExpected)
if ((DateTime.Now - start).TotalSeconds > .5)
return SVL_Command.Error;
else
Thread.Sleep(5);
_port.Read(packet, 0, bytesExpected);
int length = (packet[0] << 8) + packet[1];
if (length < 2)
return SVL_Command.Error;
if (CalcCRC(packet, 2, length) != 0)
Log(“CRC Error”);
else
return (SVL_Command)packet[2];
}
catch (Exception e)
{
Log("ReceivePacket exception " + e.Message);
}
return SVL_Command.Error;
}
#endregion
#region Execute
private bool Execute()
{
byte baudDetect = { (byte)‘U’ };
byte firmware = File.ReadAllBytes(firmwareFile);
for (int attempt = 0; attempt < 3; attempt++)
{
if (!InitializePort())
{
Log(“Can’t open COM port”);
continue;
}
Thread.Sleep(150);
_port.Write(baudDetect, 0, 1);
Log(“Port open, sending baud char”);
if (ReceivePacket(6) != SVL_Command.Version)
{
Log(“No/Invalid response from loader”);
continue;
}
SendPacket(SVL_Command.EnterBootloader);
int offset = 0, resendCount = 0;
bool succeeding = true, first = true;
while (succeeding)
{
switch (ReceivePacket(5))
{
case SVL_Command.Error:
succeeding = false;
break;
case SVL_Command.NextFrame:
resendCount = 0;
if (first)
first = false; // On first receipt, don’t move forward
else
offset += frameSize;
break;
case SVL_Command.ResendFrame:
if (++resendCount > 3)
{
succeeding = false;
Log(“Too many frame retries”);
}
else
Log(“Frame REJECTED, retry”);
break;
}
// If no error, send next frame (or done)
if (succeeding)
if (offset < firmware.Length)
SendPacket(SVL_Command.FirmwareFrame, firmware, offset, (firmware.Length - offset > frameSize) ? frameSize : firmware.Length - offset);
else
{
SendPacket(SVL_Command.Done);
return true;
}
}
}
return false;
}
#endregion
#region Tools
///
/// Initialize COM port
///
public bool InitializePort()
{
if (_port != null)
{
_port.RtsEnable = false;
_port.Close();
Thread.Sleep(OneSecond);
}
_port = (ComPort != null) ? new SerialPort(ComPort, 921600, Parity.None, 8, StopBits.One) : null;
if (_port != null)
{
try
{
_port.RtsEnable = true;
_port.DtrEnable = false;
_port.Handshake = Handshake.None;
_port.Open();
_port.DiscardInBuffer();
return true;
}
catch
{
}
_port.Close();
_port = null;
}
return false;
}
///
/// Log some text
///
/// Text to log
private static void Log(string text)
{
if (StealthIO.Instance != null)
StealthIO.Instance.SendEvent(StealthEventType.Log, string.Format(“Firmware Download: {0}”, text));
}
private static ushort crctab =
{
0x0000, 0x8005, 0x800F, 0x000A, 0x801B, 0x001E, 0x0014, 0x8011,
0x8033, 0x0036, 0x003C, 0x8039, 0x0028, 0x802D, 0x8027, 0x0022,
0x8063, 0x0066, 0x006C, 0x8069, 0x0078, 0x807D, 0x8077, 0x0072,
0x0050, 0x8055, 0x805F, 0x005A, 0x804B, 0x004E, 0x0044, 0x8041,
0x80C3, 0x00C6, 0x00CC, 0x80C9, 0x00D8, 0x80DD, 0x80D7, 0x00D2,
0x00F0, 0x80F5, 0x80FF, 0x00FA, 0x80EB, 0x00EE, 0x00E4, 0x80E1,
0x00A0, 0x80A5, 0x80AF, 0x00AA, 0x80BB, 0x00BE, 0x00B4, 0x80B1,
0x8093, 0x0096, 0x009C, 0x8099, 0x0088, 0x808D, 0x8087, 0x0082,
0x8183, 0x0186, 0x018C, 0x8189, 0x0198, 0x819D, 0x8197, 0x0192,
0x01B0, 0x81B5, 0x81BF, 0x01BA, 0x81AB, 0x01AE, 0x01A4, 0x81A1,
0x01E0, 0x81E5, 0x81EF, 0x01EA, 0x81FB, 0x01FE, 0x01F4, 0x81F1,
0x81D3, 0x01D6, 0x01DC, 0x81D9, 0x01C8, 0x81CD, 0x81C7, 0x01C2,
0x0140, 0x8145, 0x814F, 0x014A, 0x815B, 0x015E, 0x0154, 0x8151,
0x8173, 0x0176, 0x017C, 0x8179, 0x0168, 0x816D, 0x8167, 0x0162,
0x8123, 0x0126, 0x012C, 0x8129, 0x0138, 0x813D, 0x8137, 0x0132,
0x0110, 0x8115, 0x811F, 0x011A, 0x810B, 0x010E, 0x0104, 0x8101,
0x8303, 0x0306, 0x030C, 0x8309, 0x0318, 0x831D, 0x8317, 0x0312,
0x0330, 0x8335, 0x833F, 0x033A, 0x832B, 0x032E, 0x0324, 0x8321,
0x0360, 0x8365, 0x836F, 0x036A, 0x837B, 0x037E, 0x0374, 0x8371,
0x8353, 0x0356, 0x035C, 0x8359, 0x0348, 0x834D, 0x8347, 0x0342,
0x03C0, 0x83C5, 0x83CF, 0x03CA, 0x83DB, 0x03DE, 0x03D4, 0x83D1,
0x83F3, 0x03F6, 0x03FC, 0x83F9, 0x03E8, 0x83ED, 0x83E7, 0x03E2,
0x83A3, 0x03A6, 0x03AC, 0x83A9, 0x03B8, 0x83BD, 0x83B7, 0x03B2,
0x0390, 0x8395, 0x839F, 0x039A, 0x838B, 0x038E, 0x0384, 0x8381,
0x0280, 0x8285, 0x828F, 0x028A, 0x829B, 0x029E, 0x0294, 0x8291,
0x82B3, 0x02B6, 0x02BC, 0x82B9, 0x02A8, 0x82AD, 0x82A7, 0x02A2,
0x82E3, 0x02E6, 0x02EC, 0x82E9, 0x02F8, 0x82FD, 0x82F7, 0x02F2,
0x02D0, 0x82D5, 0x82DF, 0x02DA, 0x82CB, 0x02CE, 0x02C4, 0x82C1,
0x8243, 0x0246, 0x024C, 0x8249, 0x0258, 0x825D, 0x8257, 0x0252,
0x0270, 0x8275, 0x827F, 0x027A, 0x826B, 0x026E, 0x0264, 0x8261,
0x0220, 0x8225, 0x822F, 0x022A, 0x823B, 0x023E, 0x0234, 0x8231,
0x8213, 0x0216, 0x021C, 0x8219, 0x0208, 0x820D, 0x8207, 0x0202
};
private ushort CalcCRC(byte data, int offset = 0, int length = -1)
{
ushort crc = 0, t;
if (length < 0)
length = data.Length;
for (int i = 0; i < length; i++)
{
t = crctab[data[offset + i] ^ (crc >> 8)];
crc = (ushort)((((t >> 8) ^ (byte)crc) << 8) | (byte)t);
}
return crc;
}
#endregion
}
}
