Using the Pattern Generator

1.1

Plug in your Test & Measurement Device, then start WaveForms and make sure your device is connected.

If no device is connected to the host computer when WaveForms launches, the Device Manager will launch automatically.

Make sure that the device is plugged in and turned on, at which point it will appear in the Device Manager's device list (1). Click on the device in the list (“DEMO” devices are also listed, which allow the user to use WaveForms and create projects without a physical device) to select it, then click the Select button (2) to close the Device Manager.

Note: The Device Manager can be reopened by clicking on the “Connected Device” button in the bottom right corner of the screen (3), or by selecting “Device Manager” from the “Settings” menu at the top of the screen.

1.2

Once the Welcome page loads, in the instrument panel at the left side of the window, click on the Patterns button to open the Pattern Generator instrument.

1.3

Once the Pattern Generator instrument opens, the window contains the output plot (1), the configuration panel (2) to left of the plot, and the control toolbar (3) at the top of the window.

2.1 Software Setup

On the left panel, select the “Click to Add channels” (1 in image at right) or the green plus button (). The menu that pops up allows signals to be added as individual lines, a bus, a standard protocol, or a custom protocol. To add individual lines, select “Signal” (2) and use CTRL and/or SHIFT to select multiple lines. For now, select DIO 0 and click “Ok”. Under the Type column, choose “Clock” from the dropdown menu and leave the other settings in their default state.

Return to WaveForms' Welcome page by clicking on its tab at the top left of the screen and select Logic. Alternatively, press the green plus button next to “Welcome” in the tab to add the instrument (3). On the left panel, select the “Click to Add channels” button or the green plus button (). From “Signals” select DIO 0 and click “Ok”. For a detailed tutorial on using the Logic Analyzer instrument, click here ().

2.2 Generate Data

In the Pattern Generator instrument, click the Run button () button in the control bar, and then click the Run button in the Logic Analyzer instrument (1 & 2, respectively, in the image to the right). The signal being generated by the Patterns instruments should appear in the Logic Analyzer instrument.

3.1 Control Interface

The bar near the top contains several options for controlling the pattern generator.

The Run/Stop button starts and stops the pattern generator.

The Trigger dropdown allows for selection of trigger sources from other instruments. For more information, please see the Cross-Triggering Guide link.

Wait allows for configuration of a delay after pressing Run (or the trigger event occurs). The value can be selected from the dropdown or typed in. If typing, be sure to enter a unit (ns, us, s, ms, ks, Ms) to avoid defaulting to the wrong order of magnitude.

Run determines the period of time the pattern generator will generate a pattern for. It also automatically changes the horizontal time axis in the plot (unless manually overridden as shown in section 3.2), making it so the Pattern Generator plot always shows a single period of the pattern (if “continuous” is selected) or the the entire pattern that will be generated (if a time period is selected).

Repeat is available if the Pattern Generator is set to run for a finite amount of time, and will cause the instrument to generate the pattern the set number of times. In “continuous” mode this option is greyed out and set to “infinite”.

3.2 Pattern Signal Controls

Starting from the left, the plus () and minus ({[learn:instrumentation:tutorials:analog-discovery-studio-pattern-generator:minus.png?nolink}} buttons can be used to add or remove channels.

The Show icon () selects which parameters are shown for each channel. The first four parameters (Output, Idle, Type, and Parameter1) are available for every type of signal, while the last 2 parameters are type-dependent.

The selections available in Parameter1 through Parameter3 menus will change depending on the selection in Type.

Output changes between four output behaviors:

• PP (Push-Pull): possible output values are 0 and 1.
• OD (Open Drain): possible output values are 0 and Z. Bus values are computed by treating Z as 1. Requires a pull-up resistor
• OS (Open Source): possible output values are Z and 1. Bus values are computed by treating Z as 0. Requires a pull-down resistor
• TS (Tri-State): possible output values are 0, 1, and Z. Bus values containing Z will be displayed as a question mark.

Idle determines if the line is set high, low, or hi-Z when no signal is being driven through

Type determines the output types. Since the Parameter columns are Type-dependant, they will be described alongside the signal type:

(NOTE: Parameter2 and Parameter 3 are not available for all signal types.)

• Constant: holds signal as a constant, set by Parameter 1. Allowable states are determined by the Output parameter described above.
• Clock: generates a clock signal. The frequency is set by Parameter1, the duty cycle percentage is set by Parameter2, and the phase in degrees is set by Parameter3
• Pulse: generates a pulse signal. Parameter1 determines if the signal is active high or low, the number of data points to hold the signal low is set by Parameter2, and number of data points to hold the signal high is set by Parameter3. By default data point lasts 10ns, so use the following formula to determine the pulse frequency:
• Random: generates a random pattern of outputs at a frequency determined by Parameter1.
• Custom: generates a custom pattern with frequency determined by Parameter1.

Each signal can be further modified by clicking the Parameter Editor button (), located to the left of the Output column. Each Type selection will generate a different menu type.

Use the Properties button () to change the name or DIO pin of each signal line. It is located to the right of the signal name.

3.3 Plot Controls

If the plot needs to be set to show a specific point in the pattern, this can be achieved using the dropdown menus directly below the control bar. The menu with “Auto” it it by default needs to be set to “Manual” to change the other two menus.

The Show dropdown will determine how much time per division to display.

The From dropdown will determine what the start point will be on the plot.