public OpenByDescription ( string description ) : FT_STATUS | ||
description | string | Description of the device to open. |
return | FT_STATUS |
// public methods /// <summary> /// Attempt to open RHA2000-EVAL board connected to USB port. /// </summary> /// <param name="firmwareID1">Board ID number (1 of 3)</param> /// <param name="firmwareID2">Board ID number (2 of 3)</param> /// <param name="firmwareID3">Board ID number (3 of 3)</param> public void Open(ref int firmwareID1, ref int firmwareID2, ref int firmwareID3) { // Open FTDI USB device. UInt32 ftdiDeviceCount = 0; FTDI.FT_STATUS ftStatus = FTDI.FT_STATUS.FT_OK; // Create new instance of the FTDI device class. myFtdiDeviceA = new FTDI(); // Determine the number of FTDI devices connected to the machine. ftStatus = myFtdiDeviceA.GetNumberOfDevices(ref ftdiDeviceCount); // Check status. if (!(ftStatus == FTDI.FT_STATUS.FT_OK)) { UsbException e = new UsbException("USB Setup Error: Failed to get number devices"); throw e; } // If no devices available, return. if (ftdiDeviceCount == 0) { UsbException e = new UsbException("No valid USB devices detected"); throw e; } // Allocate storage for device info list. FTDI.FT_DEVICE_INFO_NODE[] ftdiDeviceList = new FTDI.FT_DEVICE_INFO_NODE[ftdiDeviceCount]; // Populate our device list. ftStatus = myFtdiDeviceA.GetDeviceList(ftdiDeviceList); // There could be a status error here, but we're not checking for it... // The Intan Technologies RHA2000-EVAL board uses an FTDI FT2232H chip to provide a USB // interface to a PC. Detailed information on this chip may be found at: // // http://www.ftdichip.com/Products/ICs/FT2232H.htm // // The FT2232H supports two independent FIFO channels. The channel used by the RHA2000-EVAL // board is factory-configured with the name "Intan I/O board 1.0 A". (FTDI provides software // routines to open device by its name.) ftStatus = myFtdiDeviceA.OpenByDescription("Intan I/O Board 1.0 A"); if (ftStatus != FTDI.FT_STATUS.FT_OK) { UsbException e = new UsbException("Intan USB device A not found"); throw e; } // Set read timeout to 5 seconds, write timeout to infinite ftStatus = myFtdiDeviceA.SetTimeouts(5000, 0); // There could be status error here, but we're not checking for it... this.Stop(); // Purge receive buffer myFtdiDeviceA.Purge(FTDI.FT_PURGE.FT_PURGE_RX); // Check board ID and version number // // The RHA2000-EVAL board is controlled by sending one-byte ASCII command characters over // the USB interface. The 'I' character commands the board to return a 3-byte ID/version // number. UInt32 numBytesWritten = 0; Byte[] myChars = { 73 }; // 'I' = request board ID and version number ftStatus = myFtdiDeviceA.Write(myChars, 1, ref numBytesWritten); if (ftStatus != FTDI.FT_STATUS.FT_OK) { UsbException e = new UsbException("Could not write to Intan USB device"); throw e; } const UInt32 numBytesToRead = 3; // Wait until the desired number of bytes have been received. UInt32 numBytesAvailable = 0; while (numBytesAvailable < numBytesToRead) { ftStatus = myFtdiDeviceA.GetRxBytesAvailable(ref numBytesAvailable); if (ftStatus != FTDI.FT_STATUS.FT_OK) { UsbException e = new UsbException("Failed to get number of USB bytes available to read"); throw e; } } // Now that we have the amount of data we want available, read it. UInt32 numBytesRead = 0; ftStatus = myFtdiDeviceA.Read(readDataBufferA, numBytesToRead, ref numBytesRead); if (ftStatus != FTDI.FT_STATUS.FT_OK) { UsbException e = new UsbException("USB read error"); throw e; } firmwareID1 = Convert.ToInt32(readDataBufferA[0]); firmwareID2 = Convert.ToInt32(readDataBufferA[1]); firmwareID3 = Convert.ToInt32(readDataBufferA[2]); Debug.WriteLine("Board ID: " + readDataBufferA[0] + " " + (Convert.ToInt32(readDataBufferA[1])).ToString() + " " + (Convert.ToInt32(readDataBufferA[2])).ToString()); this.ZCheckOff(); this.SettleOff(); // Purge receive buffer. myFtdiDeviceA.Purge(FTDI.FT_PURGE.FT_PURGE_RX); dataJustStarted = true; }