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LonTalk Stack Developer’s Guide 189
Function Description
LonNvdDeserializeSegment() Indicates a request to update the LonTalk
Stack device’s control structures from the
serialized application’s data segment.
LonNvdEnterTransaction() Indicates a request to begin a transaction for
the non-volatile data segment.
LonNvdExitTransaction() Indicates a request to complete a transaction
for the non-volatile data segment.
LonNvdGetApplicationSegmentSize()
Indicates a request to determine the number of
bytes required to store the application’s
non-volatile data segment.
LonNvdIsInTransaction() Indicates a request to determine if a
transaction for the non-volatile data segment
was in progress during the device’s previous
shutdown.
LonNvdOpenForRead() Indicates a request to open a non-volatile data
segment for reading.
LonNvdOpenForWrite() Indicates a request to open a non-volatile data
segment for writing.
LonNvdRead() Indicates a request to read a section of a
non-volatile data segment.
LonNvdWrite() Indicates a request to write a section of a
non-volatile data segment.
LonNvdSerializeSegment() Indicates a request to create a serialized image
of the application’s non-volatile data segment.
The Operating System Abstraction Layer
The LonTalk Stack includes an operating system abstraction layer (OSAL),
which allows the LonTalk host stack and LonTalk Stack applications to be ported
to any operating system that is supported for the embedded processor.
Example OSAL implementations are included for Linux and Windows. The
OSAL is provided as source code so that you can modify either of the
implementations to support other operating systems.
For detailed information about the OSAL, see the HTML API documentation and
the API source code:
• HTML API documentation: Start → Programs → Echelon LonTalk
Stack → Documentation → API Reference
• API source code for the example applications: Start → Programs →
Echelon LonTalk Stack → Source Code
- Developer's Guide 1
- Table of Contents 3
- Welcome 9
- Audience 9
- Related Documentation 9
- ONWORKS device 13
- Overview 14
- ShortStack Developer’s Kit 16
- Smart Transceiver 17
- Communications Channel 17
- Stack Devices 19
- LonTalk Stack Architecture 22
- Process 24
- ONWORKS events 27
- ONWORKS network 28
- Getting Started with the 31
- LonTalk Stack Overview 32
- Hardware Requirements 32
- Software Requirements 32
- LonTalk Stack Files 33
- ONWORKS network interface 34
- ONWORKS channel 34
- See Appendix G 35
- Loading the Echelon Smart 37
- Transceiver or Neuron Chip 37
- Loading Overview 38
- Designing the Serial I/O 43
- Hardware Interface 43
- Reliability 44
- Serial Communication Lines 44
- The RESET~ Pin 45
- **5 PPSBPTPEAPMinBitRate 46
- Interface 47
- Host Latency Considerations 48
- SCI Interface 48
- Health Check 49
- Echelon Smart 50
- Transceiver 50
- MIP Driver 51
- Code Packet Layout 52
- Type Code Values 54
- Acknowledgment Rules 56
- Detection 57
- Supported MIP Command Set 57
- Layer 2 / Layer 5 Modes 58
- Serial MIP Driver Example 59
- Serial MIP Driver API 59
- Structures 59
- Creating a Model File 63
- Model File Overview 64
- Choosing the Data Type 66
- Defining a Functional Block 67
- Declaring a Functional Block 68
- Defining a Network Variable 68
- Variable 70
- Value Changes 74
- Linearization 76
- Declaring a Message Tag 79
- Defining a Resource File 80
- Anonymous Top-Level Types 83
- Legacy Neuron C Constructs 83
- How Authentication Works 85
- Managing Memory 86
- Address Table 86
- Alias Table 87
- Domain Table 87
- Example Model files 88
- Using the LonTalk Interface 93
- Developer Utility 93
- Specifying the Project File 94
- Chip Configuration 95
- Configuring the Buffers 97
- Configuring the Application 98
- ONMARK Standard Program 100
- Specifying the Model File 101
- Copied Files 106
- FtxlDev.h 107
- FtxlDev.c 107
- Using Types 107
- Bit Field Members 109
- Floating Point Variables 110
- Enumerations 110
- Declarations 112
- The Network Variable Table 115
- Network Variable Attributes 115
- The Message Tag Table 116
- Developing a LonTalk Stack 117
- Device Application 117
- Using the LonTalk API 118
- LonTalk Protocol Stack 119
- Callbacks and Events 120
- Restoring Non-Volatile Data 122
- Writing Non-Volatile Data 123
- ONWORKS 127
- Host Processor 128
- Application 128
- Network 129
- Variables 132
- Validating a Type Change 133
- Processing a Type Change 134
- Processing a Size Change 135
- Rejecting a Type Change 136
- Messages 137
- Handling Management Commands 138
- Handling Reset Events 139
- Querying the Error Log 139
- Working with ECS Devices 139
- Using Direct Memory Files 140
- The DMF Memory Window 141
- File Directory 142
- Developing an IP-852 Router 145
- LtLogicalChannel 146
- LtIp852Router 146
- . The application 147
- . The unique ID of the 147
- . The 32-bit 147
- Porting a LonTalk Stack 149
- Porting Overview 150
- LonLink Driver 150
- Service LED 151
- Socket Interfaces 151
- LonTalkStack Source Files 151
- Selecting the Device Type 153
- File System Requirements 154
- Appendix A 155
- LonTalk Interface Developer 155
- Command Line Usage 155
- Command Usage 156
- Command Switches 157
- Specifying Buffers 159
- Appendix B 163
- Appendix C 169
- Functional Block Syntax 170
- Keywords 170
- Examples 172
- Network Variable Syntax 176
- The Network Variable Type 178
- Information 179
- Message Tag Syntax 189
- Appendix D 191
- LonTalk API 191
- Introduction 192
- Callback Handler Functions 192
- LonTalk API Functions 192
- Other LonTalk API Functions 193
- ONWORKS device. The 194
- Extended API Functions 195
- Event Handler Functions 196
- Functions 197
- Managing Critical Sections 202
- Managing Binary Semaphores 202
- Managing System Timing 203
- 192 Appendix D: LonTalk API 204
- Appendix E 205
- Determining Memory Usage for 205
- LonTalk Stack Applications 205
- Memory Use for Code 206
- Memory Use for Transactions 206
- Memory Use for Buffers 207
- Memory for Non-Volatile Data 208
- CPNVlen 210
- Appendix F 213
- Downloading a LonTalk Stack 213
- Application Over the Network 213
- Application Download Utility 215
- Appendix G 217
- Example LonTalk Stack 217
- Applications 217
- Running the Examples 219
- Application Details 220
- Main Function 221
- 210 Appendix G: Appendix G 222
- Example LonTalk 222
- Application Task Function 223
- Event Handler Function 224
- Callback Handler Function 225
- Model File 226
- Appendix H 231
- Error and Warning Messages 231
- Error Messages 232
- ONWORKS Bin folder 234
- Warning Codes 238
- Hint Codes 240
- Appendix I 243
- Glossary 243
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