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This version (07 Apr 2021 22:14) was approved by Brandon Bushey.The Previously approved version (10 Mar 2021 08:15) is available.Diff

Table of Contents

Scopy Pattern Generator

Video

General Description

The pattern generator instrument can be used to generate output from the M2K with user configurable parameters. It consists of 3 parts:

  • Channel handles
  • Signals Plot
  • Control Panel

The buttons on top of the pattern generator are:

  • The Run button starts the pattern generation.
  • The Single button starts a single shot generation.
  • The gearwheel button activates the general settings menu in the control panel.
  • The sliders button activates the pattern settings menu in the control panel.

The plot shows a preview of the generated signals by the pattern generator. For the enabled channels, the generated waveform is shown. For channel groups (groups of one or more channels) a “decoder” is displayed and has the purpose to graphically represent the binary value of the channel group. The channel enumerator panel lists all available channels on the device, and allows the user to enable them.

The user can enable channels by clicking the blue checkbox button, setting the channel as an output. By double clicking the channel the channel settings for it will be shown In the channel settings the name, trace height are displayed. If the channel is part of a group, then the channels in the group are shown and can be removed by clicking the red X button or changed in order using the drag widget. The pattern for this channel/ channel group can be changed and the corresponding pattern settings are displayed. To group a set of channel the same mechanism as in the Logic Analyzer is used. Click the group button (it becomes “done”) select all the channels you want to have in a group, then click the done button. The currently implemented patterns are:

  • Clock – generates a clock signal having user selectable frequency, phase and duty cycle.
  • Number - generates a user selectable number
  • Random – generates random values at a user selectable frequency.
  • Binary Counter – generates a binary counter on the channels in the channel group.
  • UART – generates a UART message
  • SPI - generates a SPI message
  • I2C - generates an I2C message
  • Gray Counter - generates a gray counter on the channels in the channel group
  • Import - imports a CSV file and outputs it's content




Use cases

Enable & run one channel

Click to display ⇲

Click to hide ⇱

1. Enable channel 0 - select it and enable the clock pattern


2. Start pattern generator

3. Connect channel 0 to the oscilloscope

4. Stop pattern generator

5. Modify parameters - set frequency to 1MHz, 70% duty cycle


6. Run pattern generator

Create a 4 channel binary counter

Click to display ⇲

Click to hide ⇱

3.1 Select multiple channels (Selecting a channel is done by double clicking the handle of the channel on the left side of the plot). Enable multiple channels from the channel enumerator

3.2 Create group Group this 4 channels together

3.3 Select Binary Counter pattern

3.4 The plot should resemble a binary counter

3.5 Start pattern generation

3.6 Using the scope verify channels 0 and 1

3.8 Using the Scopy's logic analyzer (or an external tool) verify channels 0,1,2,3

 

 

Change settings while running

Click to display ⇲

Click to hide ⇱

1. Channels can be modified/enabled/disabled while running. The pattern generator will reconfigure and resume running the patterns. While reconfiguring, all pins of the M2K will be taken high impedance in the meantime.

 

Single-shot generation

Click to display ⇲

Click to hide ⇱

1. Select single

Clicking single shot will generate a single buffer and then switch all pins to high impedance.

 

Special patterns

Click to display ⇲

Click to hide ⇱

1. Enable a channel and set UART pattern

2. Set parameters 9600, 8 bits, 1 stop bit, no parity, text “HELLO”

3. Select channel 15 only and group with selected ( this will create a one-channel group with decoder) The UART decoder should pop up over channel 15

4. Monitor the channel in the logic analyzer. Use UART decoder. Alternatively use a serial terminal connected to the channel.

5. Create a 3-channel group and select SPI pattern. Set SPI parameters at will, but make sure you send some data.

6. Monitor the channels and use a SPI decoder

7. The channels should resemble the SPI pattern.

Return to Scopy Main Page

university/tools/m2k/scopy/pattgen.txt · Last modified: 07 Apr 2021 22:14 by Brandon Bushey

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