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VirtualBench: Master I2C With the DIO

by: Community Team
‎03-10-2015 06:14 AM
Last Edited by: Member Content Cleaner ‎06-16-2025 02:46 PM

Products and Environment

This section reflects the products and operating system used to create the example.

To download NI software, including the products shown below, visit ni.com/downloads.

    Hardware

  • VirtualBench All-in-One Instrument

Code and Documents

Attachment

Description

Overview
This example automates the digital input output (DIO) channels to master I2C commands and performs a read.


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Steps to Run Program

    1. Download the example program on the right under downloads.
    2. In LabVIEW software, open the program by going to File » Open… and navigating to the file.
    3. Connect the VirtualBench device.
    4. Select the correct VirtualBench bus channel from the pull-down menu of the VirtualBench Bus Channel control. Set the clock rate, address, and address size as desired; specify whether to enable pull-up resistors. Specify the data to write and number of bytes to read.
    5. Click the Run button to write and read data.
    6. The data acquired will display in the Results indicator.

 

Program Explained

 


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    • Initialize Session
      • The VirtualBench bus channel is passed into the I2C Initialize VI to initialize a new session on the I2C engine for the device.
      • A Boolean true constant is also passed into the VI to reset the device to default values.
    • Configure Instrument
      • Instrument and error information are passed into the I2C Configure Bus VI along with the clock rate, address, and address size.
      • The Boolean control will pass a true or false value to the VI depending on the front panel settings in order to specify if pull-up resistors should be enabled.
    • Perform Operation
      • Instrument and error information are passed to the I2C Write Read VI.
      • The data to write and the number of bytes to read are passed into the VI, and then the VI performs a write followed by a read.
      • The VI outputs the data read to the indicator on the front panel.
    • Close Session
      • The instrument and error information are passed to the I2C Close VI. This closes the session and deallocates any resources for the next time a session is created with the instrument.
    • Handle Errors
      • Finally, the error information is passed into the Simple Error Handler VI. If an error has occurred, a dialog box will open to notify the user.

 

Additional Resources

 

VirtualBench Examples

Example code from the Example Code Exchange in the NI Community is licensed with the MIT license.

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