Diffusion Instrument Control (FreqRINCal) Browse

MyCommCont.m
4a20848a1684FreqRINCal

MyCommCont.m
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			% Communicator container.
			% This class provides extended functionality for communication using VISA,
			% tcpip and serial objects or any other objects that have a similar usage.

			classdef MyCommCont < handle

			properties (Access = public)
			interface = 'serial'
			address = 'placeholder'

			% Communication object
			Comm
			end

			methods (Access = public)
			function this = MyCommCont(varargin)
			P = MyClassParser(this);
			processInputs(P, this, varargin{:});
			end

			function delete(this)

			% Close the connection to the device
			try
			closeComm(this);
			catch ME
			warning(['Connection could not be closed. Error: ' ...
			ME.message]);
			end

			% Delete the device object
			try
			delete(this.Comm);
			catch ME
			warning(['Communication object could not be deleted. ' ...
			'Error: ' ME.message]);
			end
			end

			%% Set up communication

			% Create an interface object
			function connect(this)
			if ~isempty(this.Comm)

			% Delete the existing object before creating a new one.
			delete(this.Comm);
			end

			try
			switch lower(this.interface)

			% Use 'constructor' interface to create an object with
			% more that one parameter passed to the constructor
			case 'constructor'

			% In this case 'address' is a MATLAB command that
			% creates communication object when executed.
			% Such commands, for example, are returned by
			% instrhwinfo as ObjectConstructorName.
			this.Comm = eval(this.address);
			case 'visa'

			% visa brand is 'ni' by default
			this.Comm = visa('ni', this.address);
			case 'tcpip'

			% Works only with default socket. Use 'constructor'
			% if socket or other options need to be specified
			this.Comm = tcpip(this.address);
			case 'serial'
			this.Comm = serial(this.address);
			otherwise
			error(['Unknown interface ''' this.interface ...
			''', a communication object is not created.'...
			' Valid interfaces are ''constructor'', ' ...
			'''visa'', ''tcpip'' and ''serial'''])
			end

			configureCommDefault(this);
			catch ME
			warning(ME.message);

			% Create a dummy
			this.Comm = serial('placeholder');
			end
			end

			% Set larger buffer sizes and longer timeout than the MATLAB default
			function configureCommDefault(this)
			comm_props = properties(this.Comm);
			if ismember('OutputBufferSize',comm_props)
			this.Comm.OutputBufferSize = 1e7; % bytes
			end
			if ismember('InputBufferSize',comm_props)
			this.Comm.InputBufferSize = 1e7; % bytes
			end
			if ismember('Timeout',comm_props)
			this.Comm.Timeout = 10; % s
			end
			end

			function bool = isopen(this)
			try
			bool = strcmp(this.Comm.Status, 'open');
			catch
			warning('Cannot access the communicator Status property');
			bool = false;
			end
			end

			% Opens the device if it is not open. Does not throw error if
			% device is already open for communication with another object, but
			% tries to close existing connections instead.
			function openComm(this)
			try
			fopen(this.Comm);
			catch
			if isa(this.Comm, 'serial')

			% Try to find and close all the serial objects
			% connected to the same port
			instr_list = instrfind('Port', this.Comm.Port);
			else

			% Try to find and close all the devices with the same
			% VISA resource name
			instr_list = instrfind('RsrcName', this.Comm.RsrcName);
			end

			fclose(instr_list);
			fopen(this.Comm);

			warning(['Multiple instrument objects of ' ...
			'address %s exist'], this.address);
			end
			end

			function closeComm(this)
			fclose(this.Comm);
			end

			%% Communication

			% Write textual command
			function writeString(this, str)
			try
			fprintf(this.Comm, str);
			catch ME
			try
			% Attempt re-opening communication
			openComm(this);
			fprintf(this.Comm, str);
			catch
			rethrow(ME);
			end
			end
			end

			% Query textual command
			function result = queryString(this, str)
			try
			result = query(this.Comm, str);
			catch ME
			try
			% Attempt re-opening communication
			openComm(this);
			result = query(this.Comm, str);
			catch
			rethrow(ME);
			end
			end
			end
			end
			end

rINSTCONTROL/@MyCommCont/MyCommCont.m4a20848a1684FreqRINCal

MyCommCont.mView Options

rINSTCONTROL/@MyCommCont/MyCommCont.m
4a20848a1684FreqRINCal

MyCommCont.m
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