 C166 User's Guide | |
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C166 User's Guide
C166 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming Sections, Classes, and Groups
Special Sections Locating Sections Customization Files Startup Code STARTUP.A66 START167.A66 Basic I/O Memory Allocation TRAPS.C Optimizer Optimizer Options General Optimizations 80C166-Specific Optimizations Global Register Coloring DPP Registers Stacks System Stack User Stack Stack Sizes System Stack Size User Stack Size XBUS Memory and Peripherals On-chip XRAM XBUS Peripherals Interfacing C to Assembler Function Parameters Function Return Values Using the SRC Directive Register Usage Example Routines TINY Model SMALL Model COMPACT Model MEDIUM Model LARGE Model Data Storage Formats Bit Variables 1-byte Scalars 2-byte Scalars 4-byte Scalars float Scalars float Errors double Scalars double Errors near Pointers far Pointers huge Pointers xhuge Pointers Absolute Memory Access Absolute Access Macros Linker Location Controls Debugging Error Messages Library Reference AppendixUser Stack Size
To determine the required size of the user stack, you may:
- Halt program execution at the entery to the main C function and fill the memory area allocated to the user stack with a constant value (such as 0xA5). The address range of the user stack (the ?C_USERSTACK section) is listed in the linker map file (*.M66) under MEMORY MAP OF MODULE heading.
- Execute all functions and interrupts in your application. Try to be as complete as possible. You may use the code coverage analysis in the µVision Debugger to make sure you have executed all functions.
- Calculate the number of bytes that were changed (from your constant value). This indicates the number of bytes of the user stack that were used.
- Calculate the number of bytes of the stack that were changed (from your constant value). This indicates the number of bytes that were used. We recommend that you have at least 100 bytes (50 words) of additional stack space.
Note
- We recommend that you have at least 100 bytes (50 words) of user stack space beyond the maximum calculated requirements.
- If your application behaves strangely, try increasing the size of the user stack.
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