/// <summary>
/// Close the SPI Channel
/// </summary>
public void Close()
{
if (ftHandle != IntPtr.Zero)
{
DllWraper.FT_SetBitMode(ftHandle, 0, 0);
DllWraper.FT_Close(ftHandle);
ftHandle = IntPtr.Zero;
}
}
/// <summary>
/// Initialize the MPSSE
/// </summary>
/// <param name="index">the device index</param>
/// <exception cref="FTDIException"></exception>
public void FT_MPSSE_Init(int index = 0)
{
status = DllWraper.FT_Open(index, ref ftHandle);
if (status != FTStatus.OK)
{
throw new FTDIException(status, "Cannot Open FTDI device");
}
status = DllWraper.FT_ResetDevice(ftHandle);
if (status != FTStatus.OK)
{
throw new FTDIException(status, "Cannot Reset FTDI device");
}
status = DllWraper.FT_SetUSBParameters(ftHandle, 10000, 10000);
if (status != FTStatus.OK)
{
throw new FTDIException(status, "Cannot Set USB on FTDI");
}
status = DllWraper.FT_SetLatencyTimer(ftHandle, 2);
if (status != FTStatus.OK)
{
throw new FTDIException(status, "Cannot Set Latency in FTDI");
}
status = DllWraper.FT_SetFlowControl(ftHandle, 0x0100, 0x00, 0x00);
if (status != FTStatus.OK)
{
throw new FTDIException(status, "Cannot Set Flow Control in FTDI");
}
status = DllWraper.FT_SetBitMode(ftHandle, 0, 0);
if (status != FTStatus.OK)
{
throw new FTDIException(status, "Cannot Reset FTDI Chip");
}
status = DllWraper.FT_SetBitMode(ftHandle, 0, 2);
if (status != FTStatus.OK)
{
throw new FTDIException(status, "Cannot Initialize MPSSE on FTDI");
}
status = DllWraper.FT_Purge(ftHandle, 3);
if (status != FTStatus.OK)
{
throw new FTDIException(status, "Cannot Initialize MPSSE on FTDI");
}
// Config MPSSE
byte[] outBuf = new byte[8];
byte[] inBuf = new byte[8];
uint szSent = 0, szRead = 0;
IntPtr inptr = Marshal.AllocHGlobal(inBuf.Length);
IntPtr outptr = Marshal.AllocHGlobal(outBuf.Length);
outBuf[0] = 0x84; //Loopback
Marshal.Copy(outBuf, 0, outptr, 8);
status = DllWraper.FT_Write(ftHandle, outptr, 1, ref szSent);
//Check Receive Data
status = DllWraper.FT_GetQueueStatus(ftHandle, ref szRead);
if (szRead != 0)
{
DllWraper.FT_SetBitMode(ftHandle, 0, 0);
DllWraper.FT_Close(ftHandle);
ftHandle = IntPtr.Zero;
throw new FTDIException("MPSSE Initialization Error, MPSSE receive buffer not zero");
}
//Bad Command
outBuf[0] = 0xAB;
Marshal.Copy(outBuf, 0, outptr, 8);
status = DllWraper.FT_Write(ftHandle, outptr, 1, ref szSent);
do
{
status = DllWraper.FT_GetQueueStatus(ftHandle, ref szRead);
} while (szRead == 0 && status == FTStatus.OK);
status = DllWraper.FT_Read(ftHandle, inptr, szRead, ref szRead);
Marshal.Copy(inptr, inBuf, 0, (int)szRead);
bool echod = false;
for (int i = 0; i < szRead - 1; i++)
{
if (inBuf[i] == 0xFA && (inBuf[i + 1] == 0xAB))
{
echod = true;
break;
}
}
if (!echod)
{
DllWraper.FT_Close(ftHandle);
throw new FTDIException("Error in Sync the MPSSE");
}
outBuf[0] = 0x85;
Marshal.Copy(outBuf, 0, outptr, 1);
status = DllWraper.FT_Write(ftHandle, outptr, 1, ref szSent);
status = DllWraper.FT_GetQueueStatus(ftHandle, ref szRead);
if (szRead != 0)
{
DllWraper.FT_SetBitMode(ftHandle, 0, 0);
DllWraper.FT_Close(ftHandle);
throw new FTDIException("MPSSE Receive Buffer not Empty");
}
outBuf[0] = 0x8A; //Disable Clock Divide
outBuf[1] = 0x8D; //Disable 3 phase data clocking
outBuf[2] = 0x97; //Disable adaptive clocking
Marshal.Copy(outBuf, 0, outptr, 3);
status = DllWraper.FT_Write(ftHandle, outptr, 3, ref szSent);
// Clean the unmanaged memory
Marshal.FreeHGlobal(outptr);
Marshal.FreeHGlobal(inptr);
}