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166 FTXL LonTalk API
Lowest Assignable Task Priority
The μC/OS-II operating system uses the lowest task priority for the idle task, and
it uses the second lowest task priority for the statistics task (if the statistics task
is enabled).
The documentation for the μC/OS-II operating system recommends that the
application not use the highest four priorities (0 through 3) or the lowest four
priorities (OS_LOWEST_PRIO-3 through OS_LOWEST_PRIO). By default, the
definitions in the FtxlOsal.h file reserve priorities 0 through 3 for high-priority
operating system tasks, and thus the file sets OS_HIGH_PRIORITY_BASE to 4.
To determine the values for the low-priority tasks, use the following formula:
AppTasksStackTasksOSTasksLowTask
+
+
=
where:
•
LowTask
is the value for the lowest priority-task
•
OSTasks
is the number of tasks reserved for the operating system, which
by default is 8 tasks
•
StackTasks
is the number of tasks required for the FTXL LonTalk
protocol stack, which is 10 tasks
•
AppTasks
is the number of application tasks that your application
requires, which is always at least 1 task
Thus, the minimum value (counting from priority 0) for the lowest priority task is
18 (8+10+1, minus 1 to count from priority 0).
Figure 17 shows the default settings in the FtxlOsal.h file for the task-priority
macros described in
Specifying Task Priorities
on page 161. The figure shows the
four reserved high-priority tasks, the four reserved low-priority tasks, the 10
tasks reserved for the FTXL LonTalk protocol stack, and the one task reserved
for the application.
Figure 17. Default Task Priority Settings within the FTXL OSAL
If you have no application tasks running in the low priority class, make sure that
the lowest assignable task priority is greater than or equal to the value of the
OS_LOW_APPLICATION_PRIORITY_BASE macro. If your application runs
any tasks in the low priority class, you need to set the lowest assignable task
priority to the lowest priority that your application uses.
- FTXL User’s Guide 1
- Welcome 3
- Audience 3
- Related Documentation 3
- ONWORKS System 4
- Table of Contents 7
- Introduction to FTXL 13
- Neuron-hosted 15
- ONWORKS Device 16
- Servers 17
- ShortStack Device 18
- ONWORKS 19
- ONWORKS network 19
- ONWORKS networking to a high 19
- FTXL Device 20
- Devices 20
- ONWORKS Devices 21
- Using Direct 22
- Memory Files 22
- Development Tools for FTXL 23
- FTXL Architecture 23
- The FTXL Developer’s Kit 25
- Getting 26
- Started with 26
- ONWORKS events 28
- ONWORKS network by 28
- ONWORKS network tool 28
- Getting Started with FTXL 29
- ONWORKS network connector 30
- Hardware Requirements 31
- Software Requirements 31
- DBC2C20 Software 32
- FTXL API Files 32
- 22 Getting Started with FTXL 34
- Model File Overview 36
- Choosing the Data Type 38
- Defining a Functional Block 39
- Declaring a Functional Block 40
- Defining a Network Variable 40
- Defining a Resource File 41
- Variable 42
- ONMARK Standard Program ID 43
- Using Direct Memory 45
- Value Changes 46
- static nciOffset 47
- Declaring a Message Tag 52
- NodeBuilder User’s Guide 54
- LonMaker User's Guide 54
- Anonymous Top-Level Types 55
- Legacy Neuron C Constructs 56
- How Authentication Works 57
- Address Table 59
- Alias Table 59
- Domain Table 60
- Example Model files 60
- Using Types 61
- SFPTnodeObject 62
- UFPTenergyMeter 62
- SNVT_address 65
- Using the LonTalk Interface 67
- Developer Utility 67
- Specifying the Project File 68
- Configuring the Buffers 70
- Configuring the Application 70
- ONMARK Standard Program 71
- Specifying the Model File 72
- Developer Files 73
- NodeBuilder Errors Guide 73
- Copied Files 74
- FtxlDev.h 75
- FtxlDev.c 75
- Bit Field Members 77
- Enumerations 78
- Floating Point Variables 78
- Declarations 80
- The Network Variable Table 83
- Network Variable Attributes 83
- The Message Tag Table 84
- FTXL User’s Guide 73 85
- Using the FTXL LonTalk API 86
- Host Application 87
- Application Framework 87
- Transceiver 87
- Callbacks and Events 88
- The FTXL Operating 89
- System Abstraction Layer 89
- Restoring Non-Volatile Data 90
- Writing Non-Volatile Data 91
- Initializing the FTXL Device 93
- MaxPacketRate 94
- InputBufferCount 94
- ONWORKS devices by 95
- FTXL Application 96
- FTXL LonTalk Protocol 96
- Stack and API 96
- LonEventPump() 98
- LonNvUpdateOccurred() 98
- Network 100
- Variables 100
- Validating a Type Change 101
- Processing a Type Change 102
- Processing a Size Change 103
- Rejecting a Type Change 104
- Messages 105
- Handling Management Commands 106
- Handling Reset Events 107
- Querying the Error Log 107
- Working with ECS Devices 107
- Using Direct Memory Files 108
- The DMF Memory Window 109
- LON_DMF_WINDOW_START 110
- LON_DMF_WINDOW_USAGE 110
- File Directory 111
- Working with the Nios II 113
- Development Environment 113
- Development Tools 114
- Setting up the Nios II IDE 115
- Example FTXL Applications 116
- II Operating System 118
- Running the 119
- Application 119
- Running the Application 120
- Debugging the Application 121
- FTXL Hardware Guide 122
- LonTalk Interface Developer 123
- Command Line Usage 123
- Overview 124
- Command Usage 124
- Command Switches 125
- Specifying Buffers 127
- Creating a Model File 131
- C-string-const 134
- Functional Block Syntax 138
- Keywords 138
- Examples 140
- Network Variable Syntax 144
- The Network Variable Type 146
- Information 147
- Authentication 149
- FTXL LonTalk API 159
- Introduction 160
- FTXL LonTalk API Functions 161
- Functions 161
- Extended API Functions 163
- FTXL Event Handler Functions 164
- Managing Critical Sections 170
- Managing Binary Semaphores 170
- Managing System Timing 171
- Operating System 172
- Specifying Task Priorities 173
- Maximum Number of Tasks 177
- StackTasks 178
- AppTasks 178
- Other µC/OS-II Settings 179
- Event Flags 181
- Semaphores 183
- Mailboxes 184
- Memory Management 185
- Miscellaneous 185
- Maximum Number of Event 186
- Control Blocks 186
- Task Management 187
- Time Management 188
- Timer Management 189
- Managing the Service Pin 191
- Managing Interrupts 191
- Determining Memory Usage for 193
- FTXL Applications 193
- Total Memory Use 194
- Memory Use for Transactions 195
- Memory Use for Buffers 195
- ONWORKS Resources 196
- Memory for Non-Volatile Data 197
- Node_SD_length 198
- NV_SD_length 198
- Memory Usage Examples 199
- Over the Network 203
- Application Download Utility 205
- Example Application Files 208
- Main Function 210
- Application Task Function 210
- Event Handler Function 211
- Model File 212
- Callback Handler Function 213
- Creating a Model 214
- Application-Specific 214
- Utility Functions 214
- Event Handler Functions 217
- Applications 227
- Using a Device 233
- Running the Simple Example 234
- Virtual Functional Block 238
- The Micrium Software License 239
- Error and Warning Messages 241
- Error Messages 242
- Neuron C Reference Guide 246
- [LID#50] 248
- Warning codes 249
- Hint codes 251
- Glossary 253
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