Using the NicheStack TCP/IP Stack - Nios II Edition Tutorial

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ID 683574
Date 10/04/2021
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Document Table of Contents
Document Table of Contents x
1. Using the NicheStack TCP/IP Stack - Nios II Edition Tutorial
1. Using the NicheStack TCP/IP Stack - Nios II Edition Tutorial x
1.1. Introduction 1.2. Nichestack Support and Licensing 1.3. Hardware and Software Requirements 1.4. Tutorial Files 1.5. Software Development Flow 1.6. Nios II Simple Socket Server Overview 1.7. Important NicheStack TCP/IP Stack Concepts 1.8. Where to Go Next 1.9. Hardware Setup Details 1.10. Document Revision History for the Using the NicheStack TCP/IP Stack - Nios II Edition Tutorial
1.4. Tutorial Files x
1.4.1. Hardware Design Files 1.4.2. Software Files
1.5. Software Development Flow x
1.5.1. Creating a New Nios II Project 1.5.2. Configuring the BSP 1.5.3. Examining the Nios II Simple Socket Server Project Files 1.5.4. Building and Running the Nios II Simple Socket Server Project 1.5.5. Interacting with the Nios II Simple Socket Server
1.6. Nios II Simple Socket Server Overview x
1.6.1. Software Naming Conventions 1.6.2. Software Architecture 1.6.3. MicroC-OS/II Resources
1.6.3. MicroC-OS/II Resources x
1.6.3.1. Tasks 1.6.3.2. Inter-Task Communication Resources
1.7. Important NicheStack TCP/IP Stack Concepts x
1.7.1. Error Handling 1.7.2. NicheStack TCP/IP Stack Default Task Creation 1.7.3. Creating Tasks that Use the NicheStack TCP/IP Stack Sockets Interface 1.7.4. Task Priorities in the Nios II Simple Socket Server Design 1.7.5. Task Stack Size
1.7.4. Task Priorities in the Nios II Simple Socket Server Design x
1.7.4.1. MicroC/OS-II Internal Tasks 1.7.4.2. NicheStack TCP/IP Stack Internal Tasks 1.7.4.3. Networking Initialization Task 1.7.4.4. User Networking Tasks 1.7.4.5. User Non-Networking Tasks
1.9. Hardware Setup Details x
1.9.1. Network Connection
1. Using the NicheStack TCP/IP Stack - Nios II Edition Tutorial

1.7.5. Task Stack Size

Task stack space requirements depend on how the Nios II processor, HAL, RTOS, and individual software components are configured. A quick empirical check of the Stk[] array values at runtime, through the Nios II SBT for Eclipse memory window, is an easy way to examine the top of a task stack. Examination of a task’s Stk[] array reveals differing values representing the used portion of the stack followed by multiple zeros where the stack has not yet reached. The number of zeros until the beginning of the next adjacent task stack shows how deep the stack has grown since the last system reset.

All tasks that make run-time library calls have space allocated from the top of the stack for the approximately 900-byte _reent structure. Each task has its own copy of the structure positioned on the task’s stack. The size of this structure alone reduces the amount of available stack space.

For more information about the _reent structure, refer to the “The Newlib ANSI C Standard Library” and the “Implementing MicroC/OS-II Projects for the Nios II Processor” sections of the MicroC/OS-II Real-Time Operating System chapter of the Nios II Software Developer’s Handbook.

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