You can use the myRIO Project template as a starting point for creating myRIO applications with the myRIO default FPGA personality. With the myRIO Project template, you can easily access myRIO I/O channels and onboard devices without making major modifications to the structure of the application.
Understanding the Components of This Template
This template uses a Flat Sequence structure that executes frames from left to right.
The Flat Sequence structure in this template executes the following frames from left to right:
The following table summarizes the design decisions you must make when modifying this template.
| Design Decision | Design Example | Detailed Information |
|---|---|---|
| How do you want to control the order of execution in your application? | You want data to flow as desired without using the Flat Sequence structure. | Controlling the Order of Execution |
| What data does your application need to initialize? | You want your application to open a file for logging. | Adding Initialization Code |
| Which myRIO I/O channels does your application need to access? | You want your application to control the DIO channels on the myRIO. | Modifying the Data Acquisition and Processing Code |
| What executions does your application need to complete before exiting? | You want your application to close references to make memory resources available. | Adding Closing Code |
| How does your application handle errors? | You want your application to report errors at the end of the execution flow. | Modifying Error Handling |
This template uses the Flat Sequence structure to control data flow. The data leaves each frame as the frame finishes executing. This template uses the Flat Sequence structure to demonstrate the purpose of the code in each frame.
Note Do not overuse the Flat Sequence structure for controlling the execution order because the Flat Sequence structure prohibits parallel operations.
When you modify this template, you can remove the Flat Sequence structure and establish data dependency between nodes. For example, wiring the error in and error out clusters through nodes controls the data to flow from one node to another.
This template initializes the error in cluster to specific values. You can add code to initialize your user interface and the myRIO. For example, you may want to initialize the data to specific values or to open a file for logging.
This template uses the Accelerometer Express VI to read the acceleration values from the onboard accelerometer and uses a waveform chart to display the acceleration values.
You can add code to acquire data from the myRIO and process the data based on your application needs. The myRIO Toolkit provides Express VIs and Low Level VIs for you to access I/O channels and the onboard devices.
This template uses the Reset VI to reset the onboard accelerometer. You must use the Reset VI after the completion of all operations with the myRIO I/O channels. Otherwise, the Reset VI might return unexpected results.
You can add code that executes after the data acquisition and processing completes but before the application exits. Closing code commonly accomplishes the following tasks:
By default, if an error occurs in the Accelerometer Express VI, this template stops. If you do not want the error to stop your application, you can remove the OR function and wire the Stop control directly to the conditional terminal of the While Loop. The error in and error out clusters pass error information from the beginning of the VI to the end and report the error at the end of the execution flow.
Refer to the LabVIEW Help, available by selecting Help»LabVIEW Help from LabVIEW, for information about LabVIEW concepts or objects used in this sample project. You also can use the Context Help window to learn basic information about LabVIEW objects as you move the cursor over each object. To display the Context Help window in LabVIEW, select Help»Show Context Help.
Refer to the myRIO sample projects, available from the Create Project dialog box, for examples of adapting this template to more complex applications.
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