/// <summary>
/// Starts a ROM on the cartridge
/// </summary>
/// <param name="fileName">The filename (optional)</param>
/// <remarks> The filename (optional) is used for creating a save file on the SD card</remarks>
public static void StartRom(string fileName = "")
{
if (fileName.Length < 256)
{
var filenameBytes = Encoding.ASCII.GetBytes(fileName);
Array.Resize(ref filenameBytes, 256); //The packet must be 256 bytes in length, so resize it.
CommandPacketTransmit(TransmitCommand.RomStart, 0, 0, 1);
UsbInterface.Write(filenameBytes);
}
else
{
throw new Exception("Filename exceeds the 256 character limit.");
}
}
/// <summary>
/// Writes to the cartridge ROM
/// </summary>
/// <param name="data">The data to write</param>
/// <param name="startAddress">The start address</param>
/// <returns></returns>
private static byte[] RomWrite(byte[] data, uint startAddress)
{
var length = data.Length;
CommandPacketTransmit(TransmitCommand.RomWrite, startAddress, length, 0);
UsbInterface.ProgressBarTimerInterval = length > 0x2000000 ? 0x100000 : 0x80000;
var time = DateTime.Now.Ticks;
UsbInterface.Write(data);
time = DateTime.Now.Ticks - time;
Console.WriteLine($"OK. speed: {GetSpeedString(data.Length, time)}"); //TODO: this should be in the main program! or at least return the time!
return(data);
}
/// <summary>
/// Loads an FPGA RBF file
/// </summary>
/// <param name="filename">The filename to load</param>
/// <returns></returns>
public static bool LoadFpga(string filename)
{
var data = File.ReadAllBytes(filename);
data = FixDataSize(data);
CommandPacketTransmit(TransmitCommand.FpgaWrite, 0, data.Length, 0);
UsbInterface.Write(data);
var responseBytes = CommandPacketReceive();
if (responseBytes[4] != 0)
{
throw new Exception($"FPGA configuration error: 0x{BitConverter.ToString(new byte[] { responseBytes[4] })}");
}
return(true);
}
/// <summary>
/// Transmits a command to the USB port
/// </summary>
/// <param name="commandType">the command to send</param>
/// <param name="address">Optional</param>
/// <param name="length">Optional </param>
/// <param name="argument">Optional</param>
private static void CommandPacketTransmit(TransmitCommand commandType, uint address = 0, int length = 0, uint argument = 0)
{
length /= 512; //Must take into account buffer size.
var commandPacket = new List <byte>();
commandPacket.AddRange(Encoding.ASCII.GetBytes("cmd"));
commandPacket.Add((byte)commandType);
if (BitConverter.IsLittleEndian)
{ //Convert to Big Endian
commandPacket.AddRange(BitConverter.GetBytes(address).Reverse());
commandPacket.AddRange(BitConverter.GetBytes(length).Reverse());
commandPacket.AddRange(BitConverter.GetBytes(argument).Reverse());
}
else
{
commandPacket.AddRange(BitConverter.GetBytes(address));
commandPacket.AddRange(BitConverter.GetBytes(length));
commandPacket.AddRange(BitConverter.GetBytes(argument));
}
UsbInterface.Write(commandPacket.ToArray());
}