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MyInstrument.m
53f9385c910cTekRSA-Freq-vs-Time

MyInstrument.m
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			% Generic instrument superclass
			%
			% Undefined/dummy methods:
			% queryString(this, cmd)
			%
			% These methods are intentionally not introduced as abstract as under
			% some conditions they are not necessary

			classdef MyInstrument < dynamicprops & matlab.mixin.CustomDisplay

			properties (Access = public)

			% Synchronize all properties after setting new value to one
			auto_sync = true
			end

			properties (SetAccess = protected, GetAccess = public)
			CommandList = struct()

			% Identification string
			idn_str = ''
			end

			properties (Dependent = true)
			command_names
			end

			properties (Access = protected)

			% Copying existing metadata is much faster than creating a new one
			Metadata = MyMetadata.empty()

			% Logical variables that determine if writing to the instrument
			% takes place when property is assigned new value
			CommandWriteEnabled = struct()
			end

			methods (Access = public)

			% Read all parameters of the physical device
			function sync(this)
			read_ind = structfun(@(x) ~isempty(x.readFcn), ...
			this.CommandList);
			read_cns = this.command_names(read_ind);

			for i=1:length(read_cns)
			tag = read_cns{i};
			read_value = this.CommandList.(tag).readFcn();

			% Compare to the previous value and update if different.
			% Comparison prevents overhead for objects that listen to
			% the changes of property values.
			if ~isequal(this.CommandList.(tag).last_value, read_value)

			% Assign value without writing to the instrument
			this.CommandWriteEnabled.(tag) = false;
			this.(tag) = read_value;
			this.CommandWriteEnabled.(tag) = true;
			end
			end
			end

			function addCommand(this, tag, varargin)
			p = inputParser();

			% Name of the command
			addRequired(p,'tag', @(x)isvarname(x));

			% Functions for reading and writing the property value to the
			% instrument
			addParameter(p, 'readFcn', function_handle.empty(), ...
			@(x)isa(x, 'function_handle'));
			addParameter(p, 'writeFcn', function_handle.empty(), ...
			@(x)isa(x, 'function_handle'));

			% Function applied before writeFcn
			addParameter(p, 'validationFcn', function_handle.empty(), ...
			@(x)isa(x, 'function_handle'));

			% Function or list of functions executed after updating the
			% class property value
			addParameter(p, 'postSetFcn', function_handle.empty(), ...
			@(x)isa(x, 'function_handle'));

			addParameter(p, 'value_list', {}, @iscell);
			addParameter(p, 'default', 0);
			addParameter(p, 'info', '', @ischar);

			parse(p,tag,varargin{:});

			assert(~isprop(this, tag), ['Property named ' tag ...
			' already exists in the class.']);

			for fn = fieldnames(p.Results)'
			this.CommandList.(tag).(fn{1}) = p.Results.(fn{1});
			end

			this.CommandList.(tag).info = ...
			toSingleLine(this.CommandList.(tag).info);

			vl = this.CommandList.(tag).value_list;
			if ~isempty(vl) && isempty(p.Results.validationFcn)
			this.CommandList.(tag).validationFcn = ...
			createListValidationFcn(this, vl);
			end

			% Assign default value from the list if not given explicitly
			if ~isempty(vl) && ismember('default', p.UsingDefaults)
			default = vl{1};
			else
			default = p.Results.default;
			end

			% Create and configure a dynamic property
			H = addprop(this, tag);
			H.GetAccess = 'public';
			H.SetObservable = true;
			H.SetMethod = createCommandSetFcn(this, tag);

			% Assign the default value with post processing but without
			% writing to the instrument
			this.CommandWriteEnabled.(tag) = false;
			this.(tag) = default;
			this.CommandWriteEnabled.(tag) = true;

			if ~isempty(this.CommandList.(tag).writeFcn)
			H.SetAccess = 'public';
			else
			H.SetAccess = {'MyInstrument'};
			end
			end

			% Identification
			function str = idn(this)
			assert(ismethod(this, 'queryString'), ['The instrument ' ...
			'class must define queryString method in order to ' ...
			'attempt identification.'])

			str = queryString(this, '*IDN?');

			this.idn_str = str;
			end

			% Measurement header
			function Mdt = readSettings(this)
			if isempty(this.Metadata)
			createMetadata(this);
			end

			% Ensure that instrument parameters are up to data
			sync(this);

			% Exclude idn from parameter names
			param_names = setdiff(fieldnames(this.Metadata.ParamList), ...
			{'idn'});

			for i = 1:length(param_names)
			tag = param_names{i};
			this.Metadata.ParamList.(tag) = this.(tag);
			end

			Mdt = copy(this.Metadata);
			end

			% Write new settings to the physical instrument
			function writeSettings(this, Mdt)
			assert(isa(Mdt, 'MyMetadata'), ...
			'Settings must be provided as MyMetadata object.');

			% Synchronize the instrument object and write only the settings
			% which new values are different from present
			sync(this);

			param_names = setdiff(fieldnames(Mdt.ParamList), {'idn'});

			for i = 1:length(param_names)
			tag = param_names{i};
			new_val = Mdt.ParamList.(tag);

			if ismember(tag, this.command_names)

			% Set command value under the condition that it is
			% write accessible and that that the new value is
			% different from present
			if ~isempty(this.CommandList.(tag).writeFcn) && ...
			~isequal(this.(tag), new_val)

			this.(tag) = new_val;
			end

			continue
			end

			if isprop(this, tag) && ~isequal(this.(tag), new_val)
			this.(tag) = new_val;
			end
			end
			end
			end

			methods (Access = protected)
			function createMetadata(this)
			this.Metadata = MyMetadata('title', class(this));

			% Add identification string
			addParam(this.Metadata, 'idn', this.idn_str);

			for i = 1:length(this.command_names)
			cmd = this.command_names{i};
			addObjProp(this.Metadata, this, cmd, ...
			'comment', this.CommandList.(cmd).info);
			end
			end

			% Create set methods for dynamic properties
			function f = createCommandSetFcn(~, tag)
			function commandSetFcn(this, val)

			% Validate new value
			vFcn = this.CommandList.(tag).validationFcn;
			if ~isempty(vFcn)
			vFcn(val);
			end

			% Store the unprocessed value for quick reference in
			% the future and value change tracking
			this.CommandList.(tag).last_value = val;

			% Assign the value after post processing to the property
			pFcn = this.CommandList.(tag).postSetFcn;
			if ~isempty(pFcn)
			val = pFcn(val);
			end

			this.(tag) = val;

			if this.CommandWriteEnabled.(tag)

			% Write the new value to the instrument
			this.CommandList.(tag).writeFcn(this.(tag));

			if this.auto_sync

			% Confirm the changes by reading the state
			sync(this);
			end
			end
			end

			f = @commandSetFcn;
			end

			function f = createListValidationFcn(~, value_list)
			function listValidationFcn(val)
			assert( ...
			any(cellfun(@(y) isequal(val, y), value_list)), ...
			['Value must be one from the following list:', ...
			newline, var2str(value_list)]);
			end

			f = @listValidationFcn;
			end

			% Overload a method of matlab.mixin.CustomDisplay in order to
			% modify the display of object. This serves two purposes
			% a) separate commands from other properties
			% b) order commands in a systematic way
			function PrGroups = getPropertyGroups(this)
			cmds = this.command_names;

			% We separate the display of non-command properties from the
			% rest
			props = setdiff(properties(this), cmds);

			PrGroups = [matlab.mixin.util.PropertyGroup(props), ...
			matlab.mixin.util.PropertyGroup(cmds)];
			end
			end

			%% Set and Get methods
			methods
			function val = get.command_names(this)
			val = fieldnames(this.CommandList);
			end

			function set.idn_str(this, str)
			this.idn_str = toSingleLine(str);
			end
			end
			end

rINSTCONTROL/@MyInstrument/MyInstrument.m53f9385c910cTekRSA-Freq-vs-Time

MyInstrument.mView Options

rINSTCONTROL/@MyInstrument/MyInstrument.m
53f9385c910cTekRSA-Freq-vs-Time

MyInstrument.m
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