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MyInstrument.m
35021d4f5960MyFit-edits

MyInstrument.m
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			classdef MyInstrument < dynamicprops & MyInputHandler

			properties (Access=public)
			name='';
			interface='';
			address='';
			visa_brand='ni';

			%Contains the device object. struct() is a dummy, as Device
			%needs to always support properties for consistency.
			Device=struct();

			%Trace object for storing data
			Trace=MyTrace();
			end

			properties (Constant=true)
			% Default parameters for device connection
			DEFAULT_INP_BUFF_SIZE = 1e7; % buffer size bytes
			DEFAULT_OUT_BUFF_SIZE = 1e7; % buffer size bytes
			DEFAULT_TIMEOUT = 10; % Timeout in s
			end

			events
			NewData;
			end

			methods (Access=protected)
			% This function is overloaded to add more parameters to the parser
			function p = createConstructionParser(this)
			p=inputParser();
			% Ignore unmatched parameters
			p.KeepUnmatched = true;
			addRequired(p,'interface',@ischar);
			addRequired(p,'address',@ischar);
			addParameter(p,'name','',@ischar);
			addParameter(p,'visa_brand',this.visa_brand,@ischar);
			this.ConstructionParser=p;
			end
			end

			methods (Access=public)
			function this=MyInstrument(interface, address, varargin)
			createConstructionParser(this);
			%Loads parsed variables into class properties
			parseClassInputs(this,interface,address,varargin{:});

			% Interface and address can correspond to an entry in the list
			% of local instruments. Read this entry in such case.
			if strcmpi(interface, 'instr_list')
			% load the InstrumentList structure
			InstrumentList = getLocalSettings('InstrumentList');
			% In this case 'address' is the instrument name in
			% the list
			instr_name = address;
			if ~isfield(InstrumentList, instr_name)
			error('%s is not a field of InstrumentList',...
			instr_name);
			end
			if ~isfield(InstrumentList.(instr_name), 'interface')
			error(['InstrumentList entry ', instr_name,...
			' has no ''interface'' field']);
			else
			this.interface = InstrumentList.(instr_name).interface;
			end
			if ~isfield(InstrumentList.(instr_name), 'address')
			error(['InstrumentList entry ', instr_name,...
			' has no ''address'' field']);
			else
			this.address = InstrumentList.(instr_name).address;
			end
			% Assign name automatically, but not overwrite if
			% already specified
			if isempty(this.name)
			this.name = instr_name;
			end
			end

			% Connecting device creates a communication object,
			% but does not attempt communication
			connectDevice(this);
			end

			function delete(this)
			%Closes the connection to the device
			closeDevice(this);
			%Deletes the device object
			try
			delete(this.Device);
			catch
			warning('Device object cannot be deleted')
			end
			end

			%Triggers event for acquired data
			function triggerNewData(this)
			notify(this,'NewData')
			end

			% Read all the relevant instrument properties and return as a
			% file header structure.
			% Dummy method that needs to be re-defined by a parent class
			function HdrStruct=readHeader(this)
			HdrStruct.name.value = this.name;
			HdrStruct.name.str_spec = '%s';

			HdrStruct.interface.value = this.interface;
			HdrStruct.interface.str_spec = '%s';

			HdrStruct.address.value = this.address;
			HdrStruct.address.str_spec = '%s';
			end


			%% Connect, open, configure and close the device
			% Connects to the device, explicit indication of interface and
			% address is for ability to handle instr_list as interface
			function connectDevice(this)
			try
			% visa brand, 'ni' by default
			vb = this.visa_brand;
			switch lower(this.interface)
			case 'constructor'
			% in this case the 'address' is a command
			% (ObjectConstructorName) as returned by the
			% instrhwinfo
			this.Device=eval(this.address);
			case 'visa'
			this.Device=visa(vb, this.address);
			case 'tcpip'
			% Works only with default socket. Use 'visa' or
			% 'constructor' if socket needs to be specified
			this.Device=visa(vb, sprintf(...
			'TCPIP0::%s::inst0::INSTR',this.address));
			case 'usb'
			this.Device=visa(vb, sprintf(...
			'USB0::%s::INSTR',this.address));
			case 'serial'
			com_no = sscanf(this.address,'COM%i');
			this.Device = visa(vb, sprintf(...
			'ASRL%i::INSTR',com_no));
			otherwise
			warning('Device is not connected: unknown interface');
			end
			configureDeviceDefault(this);
			catch
			warning('Device is not connected');
			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 openDevice(this)
			if ~isopen(this)
			try
			fopen(this.Device);
			catch
			% try to find and close all the devices with the same
			% VISA resource name
			try
			instr_list=instrfind('RsrcName',this.Device.RsrcName);
			fclose(instr_list);
			fopen(this.Device);
			warning('Multiple instrument objects of address %s exist',...
			this.address);
			catch
			error('Could not open device')
			end
			end
			end
			end

			% Closes the connection to the device
			function closeDevice(this)
			if isopen(this)
			fclose(this.Device);
			end
			end

			function configureDeviceDefault(this)
			dev_prop_list = properties(this.Device);
			if ismember('OutputBufferSize',dev_prop_list)
			this.Device.OutputBufferSize = this.DEFAULT_OUT_BUFF_SIZE;
			end
			if ismember('InputBufferSize',dev_prop_list)
			this.Device.InputBufferSize = this.DEFAULT_INP_BUFF_SIZE;
			end
			if ismember('Timeout',dev_prop_list)
			this.Device.Timeout = this.DEFAULT_TIMEOUT;
			end
			end

			%Checks if the connection to the device is open
			function bool=isopen(this)
			try
			bool=strcmp(this.Device.Status, 'open');
			catch
			warning('Cannot access device Status property');
			bool=false;
			end
			end
			end
			end

rINSTCONTROL/@MyInstrument/MyInstrument.m35021d4f5960MyFit-edits

MyInstrument.mView Options

rINSTCONTROL/@MyInstrument/MyInstrument.m
35021d4f5960MyFit-edits

MyInstrument.m
View Options