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The method used by the Neuron firmware to change the size of a network variable uses an NV length
override system image extension that is managed by the application. Whenever the firmware needs the
length of a network variable, it calls the network variable length override system image extension to
get it. This method provides reliable updates to network variable sizes.
For more information about changeable-type network variables and the NV length override system
image extension, as well as a commented source code example that illustrates all aspects of creating an
application that uses changeable-type network variables, see Chapter 3 of the Neuron C Programmer’s
Guide.
To implement a changeable-type network variable in your device application, follow these steps (see
Chapter 3 of the Neuron C Programmer’s Guide for a more detailed discussion of step 4):
1. Create a device template that has a changeable interface. See Specifying the Program ID in
Chapter 5 for more information on how to do this.
2. In the Code Wizard, create a new network variable or edit an existing one and select the
Changeable Type checkbox in the dialog for creating or editing the network variable. See
Editing Mandatory Network Variables, Implementing Optional Network Variables, or Adding
Implementation-specific Network Variables in Chapter 6 for more information on how to do this.
3. Generate Neuron C code for your device interface. See Generating Code with the Code Wizard in
Chapter 6 for more information on how to do this
1. In the Neuron C code generated by the Code Wizard, do the following:
a. Complete the implementation of the get_nv_length_override function. The Code Wizard
provides an empty implementation of this function in the device template’s main source file.
This function should return the length of any changeable-type network variable in the device.
b. The Code Wizard uses the #pragma unknown_system_image_extension_isa_warning
directive to generate Neuron C source code that will compile. The Code Wizard enables this
directive in the device template’s main header file. If you use a combination of Code Wizard
generated code and your own code, you can edit the relevant portion of the main header file.
You should only use the older nv_len() function to support debugging of an application
containing changeable-type network variables on platforms that do not support the system
image extension. For production release, the more robust system image extension method
should be used, and both methods should not coexist in a production device.
You can use the get_current_nv_length() function to determine the current length of a
network variable at any time (see the Neuron C Reference Guide for more information about
this method).
c. Define the behavior of the application when a request to change the network variable type is
received. The application must validate that the requested type change is supported. If it is
not, it must reject the request (either by setting invalid_request or by setting an
application-specific error and putting the device offline) and set the network variable type
back to the last valid type. If the type change is valid, it must implement the type and size
change.
The Code Wizard does not provide framework code for this task, but a commented source
code example is provided in the Neuron C Programmer’s Guide.
d. Define how the functional block behaves when sending or receiving values on
changeable-type network variables. For each valid type, the functional block must perform
any necessary conversion before operating on the value.
The Code Wizard does not provide framework code for this task, but a commented source
code example is provided in the Neuron C Programmer’s Guide.
182 Developing Device Applications
- NodeBuilder 1
- User’s Guide 1
- Chips or LonPoint Modules 2
- CONTENTS 3
- Preface 9
- Purpose 10
- Audience 10
- Hardware Requirements 10
- Content 10
- Related Manuals 11
- ONWORKS networks 12
- ONMARK SNVT and SCPT Guide 12
- Introduction 15
- LonTalk/IP Support 16
- BACnet/IP Support 17
- Series 6000 Chip Support 17
- FT 6000 EVB Evaluation Board 18
- Extended Address Table 18
- ONWORKS free 20
- IzoT Commissioning Tool 22
- IzoT Network Services Server 22
- IzoT Router 22
- IzoT Plug-in for Wireshark 22
- Network Integration 23
- Program IDs 24
- Functional Blocks 27
- Functional Profiles 27
- Device Interface Files 28
- Resource Files 28
- Hardware Templates 28
- Neuron C 28
- Device Templates 28
- Targets 29
- 16 Introduction 30
- Development Tool 31
- ONMARK International 32
- ONMARK products 35
- ONWORKS device with the 40
- ONWORKS networks. You can 40
- Application Framework 47
- FT 6000 Evaluation Boards 53
- Creating an IzoT CT Stencil 74
- Developing an HMI 79
- Windows\NxeSearchPath 80
- Windows\XifSearchPath 80
- ONMARK Certification 81
- Creating and Opening IzoT 83
- NodeBuilder Projects 83
- Using the Project Pane 85
- Manager 87
- Copying NodeBuilder Projects 95
- ONWORKS Network Design 98
- Creating Device Templates 103
- Specifying the Program ID 105
- Specifying Target Platforms 110
- Managing Device Templates 112
- Using Hardware Templates 128
- Creating Hardware Templates 129
- Editing Hardware Templates 131
- Setting Memory Properties 134
- 5000 Series Chips 135
- 6000 Series Chips 136
- 3150 Neuron Core 136
- 3120 and 3170 Neuron Core 136
- Framework 138
- Starting the Code Wizard 139
- Using the Resource Pane 140
- Introduction to Resources 142
- ONMARK 145
- ONWORKS File 145
- ONMARK Web site at 147
- ONMARK certification 148
- Adding Functional Blocks 149
- Using Code Wizard Templates 184
- Version 1 Templates 185
- Introduction to Neuron C 188
- Neuron C Variables 190
- Variable Initialization 191
- Neuron C Declarations 191
- Code Commands 193
- Code Guidelines 194
- Message Tags 197
- I/O Models 197
- Network Variables 197
- Configuration Properties 197
- Using the NodeBuilder Editor 198
- Using Syntax Highlighting 199
- Searching Source Files 199
- Replacing Text 200
- Using Bookmarks 203
- Setting Editor Options 203
- Applications 205
- Cleaning Build Output Files 211
- Viewing Build Status 212
- Setting Build Options 214
- C Interface 218
- Aardvark 219
- EEPROM or Flash 221
- Managing Target Devices 231
- Using the Data Point Shape 236
- Using the LonMaker Browser 238
- Neuron C application 247
- Introduction to Debugging 248
- Using the Debugger Toolbar 250
- Stopping an Application 251
- Halting an Application 252
- Running to the Cursor 252
- Using Statement Expansion 253
- Using the Watch List Pane 253
- Using the Call Stack Pane 257
- Peeking and Poking Memory 258
- Setting Debugger Options 259
- Appendix A 263
- Make Facility 263
- Facility 264
- Appendix B 267
- Using Source Control With a 267
- NodeBuilder Project 267
- Appendix C 271
- Glossary 271
- ONWORKS 274
- ONWORKS device applications 279
- ONMARK-compliant device 279
- ONWORKS installation 280
- ONWORKS network 280
- 270 Appendix C: Glossary 284
- Appendix D 285
- NodeBuilder Software License 285
- Agreement 285
- IzoT™ NodeBuilder 286
- Development Tool 286
- You may: 287
- TERMINATION 288
- TRADEMARKS 288
- LIMITATION OF LIABILITY 289
- SAFE OPERATION 289
- LANGUAGE 289
- SUPPORT 289
- GENERAL 290
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