dsp.LogicAnalyzer
Visualize, measure, and analyze transitions and states over time
Description
The Logic Analyzer System object™ displays the transitions in time-domain signals. Using dsp.LogicAnalyzer, you can:
Debug and analyze models
Trace and correlate 96 signals simultaneously
Detect and analyze timing violations
Trace system execution
Detect signal changes using triggers
To display the transitions of signals in the Logic Analyzer:
Create the
dsp.LogicAnalyzerobject and set its properties.Call the object with arguments, as if it were a function.
To learn more about how System objects work, see What Are System Objects?.
For more information about how to configure and customize the Logic Analyzer, see Logic Analyzer.
Creation
Description
scope = dsp.LogicAnalyzer creates a Logic Analyzer System object, scope.
scope = dsp.LogicAnalyzer(Name,Value) sets properties using one
or more name-value pairs. Enclose each property name in single quotes. For example,
scope =
dsp.LogicAnalyzer('BackgroundColor','White','NumInputPorts',4).
Properties
Usage
Description
Input Arguments
Object Functions
To use an object function, specify the
System object as the first input argument. For
example, to release system resources of a System object named obj, use
this syntax:
release(obj)
Examples
Display Simple Ramp Signals
Create a dsp.LogicAnalyzer object. Call the scope in a loop to display the signals.
scope = dsp.LogicAnalyzer('NumInputPorts',3); for ii = 1:20 scope(ii,10*ii,20*ii); end
Display Fixed-Point Signals
Create a dsp.LogicAnalyzer object with four channels. Call modifyDisplayChannel to set the radix of each of the channels. Run the scope in a loop to display the waves.
scope = dsp.LogicAnalyzer('NumInputPorts',4,'DisplayChannelFormat','Digital'); scope.TimeSpan = 12; modifyDisplayChannel(scope,1,'Name','Index','Radix','Unsigned decimal'); modifyDisplayChannel(scope,2,'Name','Fi_hex','Radix','Hexadecimal'); modifyDisplayChannel(scope,3,'Name','Fi_bin','Radix','Binary'); modifyDisplayChannel(scope,4,'Name','Fi_actual','Radix','Signed decimal'); for ii = 1:20 fival = fi((ii-1)/16,0,4,4); scope(ii,fival,fival,fival); end
Display Vector, Complex, and Enumerated Signals
Define a WeekDaysInt class to hold an enumerated list of weekday values. Create and save the following class definition file.
classdef WeekDaysInt < int32 enumeration Monday(1), Tuesday(2), Wednesday(3), Thursday(4), Friday(5) end end
Create a dsp.LogicAnalyzer object and configure the vector, complex, and enumerated data signals.
scope = dsp.LogicAnalyzer('NumInputPorts',6); waves = getDisplayChannelTags(scope); modifyDisplayChannel(scope,waves{1},'InputChannel',1,'Name','Vector Digital'); modifyDisplayChannel(scope,waves{2},'InputChannel',2,'Name','Vector Analog',... 'Format','Analog','Height',80); modifyDisplayChannel(scope,waves{3},'InputChannel',3,'Name','Complex Digital'); modifyDisplayChannel(scope,waves{4},'InputChannel',4,'Name','Complex Analog',... 'Format','Analog','Height',80,'Color','Green'); modifyDisplayChannel(scope,waves{5},'InputChannel',5,'Name','Enum Digital'); modifyDisplayChannel(scope,waves{6},'InputChannel',6,'Name','Enum Analog',... 'Format','Analog','Height',80);
Call the scope object in a loop to display the signals.
stop = 30; for count = 1:stop sinValVec = sin(count/stop*2*pi); cosValVec = cos(count/stop*2*pi); cosValVecOffset = cos((count+10)/stop*2*pi); sinValReal = sin((count+2)/stop*2*pi); cosValImag = cos((count+2)/stop*2*pi); % Create a weekday enumerated value by wrapping the index day = WeekDaysInt(1+mod(count-1,5)); scope(... [count (count-(stop/2))],... % digital vector [sinValVec cosValVec cosValVecOffset],... % analog vector complex((count-(stop/2)),count),... % digital complex complex(sinValReal, cosValImag),... % analog complex day,... % digital enum day... % analog enum ) end
Tips
To close the logic analyzer window and clear its associated data, use the MATLAB®
clear function.