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rINSTCONTROL/@MyInstrument/MyInstrument.m
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MyInstrument.m
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classdef MyInstrument < dynamicprops
properties (SetAccess=protected, GetAccess=public)
name='';
interface='';
address='';
visa_brand='';
%Contains the device object. struct() is a dummy, as Device
%needs to always support properties for consistency.
Device=struct();
%Input parser for class constructor
ConstructionParser;
%Contains a list of the commands available for the instrument as
%well as the default values and input requirements
CommandList=struct();
%Parses commands using an inputParser object
CommandParser;
%Trace object for storing data
Trace=MyTrace();
end
properties (Constant=true)
% Default parameters for VISA connection
DEFAULT_INP_BUFF_SIZE = 1e7; % buffer size bytes
DEFAULT_OUT_BUFF_SIZE = 1e7; % buffer size bytes
DEFAULT_TIMEOUT = 10; % Timeout in s
DEFAULT_VISA_BRAND = 'ni';
end
properties (Dependent=true)
command_names;
command_no;
write_commands;
read_commands;
end
events
NewData;
end
methods (Access=private)
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.DEFAULT_VISA_BRAND,@ischar);
this.ConstructionParser=p;
end
end
methods (Access=public)
function this=MyInstrument(interface, address, varargin)
p = createConstructionParser(this);
parse(p,interface,address,varargin{:});
%Loads parsed variables into class properties
this.name=p.Results.name;
this.interface=p.Results.interface;
this.address=p.Results.address;
this.visa_brand=p.Results.visa_brand;
end
function delete(this)
%Closes the connection to the device
closeDevice(this);
%Deletes the device object
delete(this.Device);
clear('this.Device');
end
%% Read and write commands
%Writes properties to device. Can take multiple inputs. With the
%option all, the function writes default to all the
%available writeable parameters.
function writeProperty(this, varargin)
%Parses the inputs using the CommandParser
parse(this.CommandParser, varargin{:});
if this.CommandParser.Results.all
% If the 'all' is true, write all the commands
exec=this.write_commands;
else
% Check which commands were passed values
ind_val=cellfun(@(x)...
(~ismember(x, this.CommandParser.UsingDefaults)),...
this.write_commands);
exec=this.write_commands(ind_val);
end
for i=1:length(exec)
%Creates the write command using the right string spec
write_command=[this.CommandList.(exec{i}).command,...
' ',this.CommandList.(exec{i}).str_spec];
%Gets the value to write to the device
this.(exec{i})=this.CommandParser.Results.(exec{i});
command=sprintf(write_command, this.(exec{i}));
%Sends command to device
fprintf(this.Device, command);
end
end
% Wrapper for writeProperty that opens and closes the device
function writePropertyHedged(this, varargin)
openDevice(this);
try
writeProperty(this, varargin{:});
catch
warning('Error while writing the properties:');
disp(varargin);
end
readProperty(this, 'all');
closeDevice(this);
end
function result=readProperty(this, varargin)
result = struct();
read_all_flag = any(strcmp('all',varargin));
if read_all_flag
% Read all the commands with read access
exec=this.read_commands;
else
ind_r=ismember(varargin,this.read_commands);
exec=varargin(ind_r);
if any(~ind_r)
% Issue warnings for commands not in the command_names
warning('The following are not valid read commands:');
disp(varargin(~ind_r));
end
end
% concatenate all commands in one string
read_command=join(cellfun(...
@(cmd)this.CommandList.(cmd).command,exec,...
'UniformOutput',false),'?;:');
read_command=[read_command{1},'?;'];
res_str = query(this.Device,read_command);
% drop the end-of-the-string symbol and split
res_str = split(res_str(1:end-1),';');
if length(exec)==length(res_str)
for i=1:length(exec)
result.(exec{i})=sscanf(res_str{i},...
this.CommandList.(exec{i}).str_spec);
%Assign the values to the MyInstrument properties
this.(exec{i})=result.(exec{i});
end
else
warning(['Not all the properties could be read, ',...
'no instrument class values are not updated']);
end
end
% Wrapper for readProperty that opens and closes the device
function result=readPropertyHedged(this, varargin)
openDevice(this);
try
result = readProperty(this, varargin{:});
catch
warning('Error while reading the properties:');
disp(varargin);
end
closeDevice(this);
end
%Triggers event for acquired data
function triggerNewData(this)
notify(this,'NewData')
end
function HdrStruct=readHeader(this)
Values=readPropertyHedged(this,'all');
for i=1:length(this.read_commands)
HdrStruct.(this.read_commands{i}).value=...
Values.(this.read_commands{i});
HdrStruct.(this.read_commands{i}).str_spec=...
this.CommandList.(this.read_commands{i}).str_spec;
end
end
%% Processing of the class variable values
% Extend the property value based on val_list
function std_val = standardizeValue(this, cmd, varargin)
if ~ismember(cmd,this.command_names)
warning('%s is not a valid command',cmd);
std_val = '';
return
end
vlist = this.CommandList.(cmd).val_list;
% The value to normalize can be explicitly passed as
% varargin{1}, otherwise use this.cmd as value
if isempty(varargin)
val = this.(cmd);
else
val = varargin{1};
end
% find matching commands
ismatch = false(1,length(vlist));
for i=1:length(vlist)
n = min([length(val), length(vlist{i})]);
% compare first n symbols disregarding case
ismatch(i) = strncmpi(val, vlist{i},n);
end
% out of matching names pick the longest
if any(ismatch)
mvlist = vlist(ismatch);
%Finds the length of each element of mvlist
n_el=cellfun(@(x) length(x), mvlist);
%Sets std_val to the longest element
std_val=mvlist{n_el==max(n_el)};
% sets the property if value was not given explicitly
if isempty(varargin)
this.(cmd) = std_val;
end
else
warning(['The value %s is not in the val_list ',...
'of %s command'], val, cmd)
std_val = val;
end
end
% Return the list of long command values excluding abbreviations
function std_val_list = stdValueList(this, cmd)
if ~ismember(cmd,this.command_names)
warning('%s is not a valid command',cmd);
std_val_list = {};
return
end
vlist = this.CommandList.(cmd).val_list;
% Select the commands, which appear only once in the beginnings
% of the strings in val_list
long_val_ind = cellfun(...
@(x)(sum(startsWith(vlist,x,'IgnoreCase',true))==1),vlist);
std_val_list = vlist(long_val_ind);
end
%% Connect, open, configure and close the device
% Connects to the device
function connectDevice(this, interface, address)
try
% visa brand, DEFAULT_VISA_BRAND if not specified
vb = this.visa_brand;
switch lower(interface)
case '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
% A check to prevent hypothetical endless recursion
if isequal(InstrumentList.(instr_name).interface,'instr_list')
error('')
end
% Connect using the loaded parameters
connectDevice(this,...
InstrumentList.(instr_name).interface,...
InstrumentList.(instr_name).address);
% Assign name automatically, but not overwrite if
% already specified
if isempty(this.name)
this.name = instr_name;
end
case 'constructor'
% in this case the 'address' is a command
% (ObjectConstructorName) as returned by the
% instrhwinfo
this.Device=eval(address);
case 'visa'
this.Device=visa(vb, address);
case 'tcpip'
this.Device= visa(vb, sprintf(...
'TCPIP0::%s::inst0::INSTR',this.address));
case 'usb'
this.Device=visa(vb, sprintf(...
'USB0::%s::INSTR',address));
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
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 verify device Status property');
bool=false;
end
end
%% addCommand
%Adds a command to the CommandList
function addCommand(this, tag, command, varargin)
p=inputParser();
addRequired(p,'tag',@ischar);
addRequired(p,'command',@ischar);
addParameter(p,'default','placeholder');
addParameter(p,'classes',{},@iscell);
addParameter(p,'attributes',{},@iscell);
addParameter(p,'str_spec','%e',@ischar);
% list of the values the variable can take, {} means no
% restriction
addParameter(p,'val_list',{},@iscell);
addParameter(p,'access','rw',@ischar);
parse(p,tag,command,varargin{:});
%Adds the command to be sent to the device
this.CommandList.(tag).command=command;
this.CommandList.(tag).access=p.Results.access;
this.CommandList.(tag).write_flag=contains(p.Results.access,'w');
this.CommandList.(tag).read_flag=contains(p.Results.access,'r');
this.CommandList.(tag).default=p.Results.default;
this.CommandList.(tag).val_list=p.Results.val_list;
% Adds the string specifier to the list. if the format
% specifier is not given explicitly, try to infer
if ismember('str_spec', p.UsingDefaults)
this.CommandList.(tag).str_spec=...
formatSpecFromAttributes(this,p.Results.classes...
,p.Results.attributes);
elseif strcmp(p.Results.str_spec,'%b')
% b is a non-system specifier to represent the
% logical type
this.CommandList.(tag).str_spec='%i';
else
this.CommandList.(tag).str_spec=p.Results.str_spec;
end
% Adds the attributes for the input to the command. If not
% given explicitly, infer from the format specifier
if ismember('classes',p.UsingDefaults)
[this.CommandList.(tag).classes,...
this.CommandList.(tag).attributes]=...
attributesFromFormatSpec(this, p.Results.str_spec);
else
this.CommandList.(tag).classes=p.Results.classes;
this.CommandList.(tag).attributes=p.Results.attributes;
end
% Adds a property to the class corresponding to the tag
if ~isprop(this,tag)
addprop(this,tag);
end
this.(tag)=p.Results.default;
end
%Creates inputParser using the command list
function p = createCommandParser(this)
%Use input parser
%Requires input of the appropriate class
p=inputParser;
p.StructExpand=0;
%Flag for whether the command should initialize the device with
%defaults
addParameter(p, 'all',false,@islogical);
for i=1:length(this.write_commands)
%Adds optional inputs for each command, with the
%appropriate default value from the command list and the
%required attributes for the command input.
tag=this.write_commands{i};
% Create validation function based on properties:
% class, attributes and list of values
if ~isempty(this.CommandList.(tag).val_list)
if all(cellfun(@ischar, this.CommandList.(tag).val_list))
% for textual values use case insentice string comparison
v_func = @(x) any(cellfun(@(y) strcmpi(y, x),...
this.CommandList.(tag).val_list));
else
% for everything else compare as it is
v_func = @(x) any(cellfun(@(y) isequal(y, x),...
this.CommandList.(tag).val_list));
end
else
v_func = @(x) validateattributes(x,...
this.CommandList.(tag).classes,...
this.CommandList.(tag).attributes);
end
addParameter(p, tag,...
this.CommandList.(tag).default, v_func);
end
this.CommandParser=p;
end
%% Auxiliary functions for auto format assignment to commands
function str_spec=formatSpecFromAttributes(~,classes,attributes)
if ismember('char',classes)
str_spec='%s';
elseif ismember('logical',classes)||...
(ismember('numeric',classes)&&...
ismember('integer',attributes))
str_spec='%i';
else
%assign default value, i.e. double
str_spec='%e';
end
end
function [class,attribute]=attributesFromFormatSpec(~, str_spec)
% find index of the first letter after the % sign
ind_p=strfind(str_spec,'%');
ind=ind_p+find(isletter(str_spec(ind_p:end)),1)-1;
str_spec_letter=str_spec(ind);
switch str_spec_letter
case {'d','f','e','g'}
class={'numeric'};
attribute={};
case 'i'
class={'numeric'};
attribute={'integer'};
case 's'
class={'char'};
attribute={};
case 'b'
class={'logical'};
attribute={};
otherwise
% Any of the above classes will pass
class={'numeric','char','logical'};
attribute={};
end
end
end
%% Get functions
methods
function command_names=get.command_names(this)
command_names=fieldnames(this.CommandList);
end
function write_commands=get.write_commands(this)
ind_w=structfun(@(x) x.write_flag, this.CommandList);
write_commands=this.command_names(ind_w);
end
function read_commands=get.read_commands(this)
ind_r=structfun(@(x) x.read_flag, this.CommandList);
read_commands=this.command_names(ind_r);
end
function command_no=get.command_no(this)
command_no=length(this.command_names);
end
end
end
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