Diffusion Instrument Control (confint-fix) Browse

MyNewportUsbComm.m
2e5bbade8d15confint-fix

MyNewportUsbComm.m
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			classdef MyNewportUsbComm < MySingleton

			properties (GetAccess = public, SetAccess = private)

			% Driver in use
			isbusy = false
			end

			properties (Access = public)

			% An instance of Newport.USBComm.USB class
			Usb
			end

			methods (Access = private)

			% The constructor of a singleton class should only be invoked from
			% the instance method.
			function this = MyNewportUsbComm()
			disp(['Creating a new instance of ' class(this)])
			loadLib(this);
			end
			end

			methods (Access = public)

			% Load dll
			function loadLib(this)
			dll_path = which('UsbDllWrap.dll');
			if isempty(dll_path)
			error(['UsbDllWrap.dll is not found. This library ',...
			'is a part of Newport USB driver and needs ',...
			'to be present on Matlab path.'])
			end
			NetAsm = NET.addAssembly(dll_path);

			% Create an instance of Newport.USBComm.USB class
			Type = GetType(NetAsm.AssemblyHandle,'Newport.USBComm.USB');
			this.Usb = System.Activator.CreateInstance(Type);
			end

			function str = query(this, addr, cmd)
			try
			waitfor(this, 'isbusy', false);
			catch ME
			warning(ME.message)
			end

			% Check if the driver is already being used by another process.
			% A race condition with various strange consequences is
			% potentially possible if it is.
			if this.isbusy
			warning('NewportUsbComm is already in use')
			end

			this.isbusy = true;

			% Send query using QueryData buffer. A new buffer needs to be
			% created every time to ensure the absence of interference
			% between different queries.
			QueryData = System.Text.StringBuilder(64);

			stat = Query(this.Usb, addr, cmd, QueryData);

			if stat ~= 0
			warning(['Query to Newport usb driver was unsuccessful.'...
			errorCodeToMessage(this, stat)]);
			end

			str = char(ToString(QueryData));

			this.isbusy = false;
			end
			end

			methods (Access = private)

			% Convert the code returned by read/write/query functions to
			% a message
			function str = errorCodeToMessage(~, stat)
			switch stat
			case 0

			% No error
			str = '';
			case -2
			str = 'Error: Device timeout';
			case 1
			str = 'Error: Duplicate USB address';
			otherwise
			str = sprintf('Error Code = %i', stat);
			end
			end
			end

			methods (Static)

			% Concrete implementation of the singleton constructor.
			function this = instance()
			persistent UniqueInstance

			if isempty(UniqueInstance) \|\| ~isvalid(UniqueInstance)
			this = MyNewportUsbComm();
			UniqueInstance = this;
			else
			this = UniqueInstance;
			end
			end
			end
			end

rINSTCONTROL/@MyNewportUsbComm/MyNewportUsbComm.m2e5bbade8d15confint-fix

MyNewportUsbComm.mView Options

rINSTCONTROL/@MyNewportUsbComm/MyNewportUsbComm.m
2e5bbade8d15confint-fix

MyNewportUsbComm.m
View Options