Labview Serial Number Generator
Table of Contents • • • • • • • • • • • • Here are some building blocks to interface an mbed with LabVIEW, allowing LabVIEW programs to interact with the real world. This could be used for things like: • data acquisition in LabVIEW via sensors connected to mbed • controlling actuators connected to mbed from LabVIEW • LabVIEW programs with hardware-in-the-loop, where sensors and actuators are interfaced with mbed but calculations and control are in LabVIEW We've created two ways for you to interface between LabVIEW and mbed.
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• LabVIEW RPC This allows you to directly control the mbed using the RPC. For many applications it wouldn't be necessary to write any custom code for the mbed. • Serial Communication These examples show how data can be transfered between the program running on mbed and your LabVIEW application. LabVIEW Setup To use mbed with LabVIEW, you need to have the NI-VISA drivers installed to give access to the USB serial port. • - LabVIEW trial version • - NI-VISA drivers for the serial port With LabVIEW and NI-VISA installed, you should be ready to go. American pie 2 full movie in hindi free download hd. LabVIEW RPC We've created a set of vi's that expose a lot of the mbed interface using RPC.
The vi's we've created allow you to create and control new objects or control objects that are created in the mbed code. The LabVIEW vi's Here are the vi's that allow you to interface with the RPC and some examples of their use. • LabVIEW vi's: - NB: For consistency the name of mbedSerial has been changed to SerialRPC • Examples: • LabVIEW Libraries for versions 8.5 and 8.6. Relinking Files When you download the files (especially the demos) they may not be in the same locations relative to the files they depend on as they were on the computer they were developed on. LabVIEW is very good at relinking files so just okay error messages or reconnect the files according to the locations in which you have saved them. Using the LabVIEW RPC vi's The LabVIEW vi's have been created to mirror the mbed api as closely as possible.
They therefore take a similar object oriented approach. We create an mbed object and then using this create objects for each of the inputs and outputs. The vi's are contained in two folders: • The 'mbed Interface' folder includes all the vi's for creating and controlling inputs and outputs on mbed. • The 'Transport Mechanisms' folder contains the vi's for creating a connection to an mbed and then closing it. We've provided the vi's as a zipped file which you can extract to any where on your computer.
To make it a bit easier to access them we've also created a Library which might be a bit easier to develop with as you can drag vi's in from it. Just open the file mbed_LVlibrary from within LabVIEW. Using the API. Information To use these vi's your mbed needs to be running code which can receive and execute RPC commands.
Information and examples of this, can be found on the page. Compile and run the program for RPC over serial to use the vi's on this page. • First create an mbed interface by using a transport mechanism. This can be either SerialRPC or HTTPRPC. • You can now create objects on mbed such as DigitalOut or AnalogIn. Wire up the input of a DigitalOut to the output from mbedSerial • To create an object connect controls or constants to the pin number.
Pins are passed as a string eg 'p21' or 'LED1' • If you have an object created on mbed then you can tie to it by passings its name as a string into the existing object name. • You can now execute the methods that are defined in the mbed api. For example you can execute a write block on a DigitalOut to set the value of the pin. Wire the write block to the object you want to act on and then add a control to set the value of the pin. • Finally wire up the SerialRPC_delete method to the mbed wire so that the serial port is closed and is avaliable to other programs.
This is demonstrated in the LED flash example the block diagrams for which are displayed above. Note that only the write method is contained within the while loop as the object only needs to be created once at the start. Using this approach you can connect multiple mbeds on different ports and control them from LabVIEW. The vi's have been designed to align as closely as possible with the api so looking in the Handbook should help explain what each method does. As its using the RPC the vi is directly calling the methods in the api. Using RPC with Custom Code The provides a mechanism for quickly adding RPC functionality to your own code.