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SCIOPTA - Real-Time Kernel

5-12 Manual Version 4.1 User’s Manual

SCIOPTA - Real-Time Kernel

5 Processes

5.12 Process Stacks

When creating processes either statically in the SCONF configuration tool or dynamically with the

sc_procPrioCreate, sc_procIntCreate or sc_procTimCreate system calls you always need to give a stack size.

All process types (init, interrupt, timer, prioritized and daemon need a stack).

The stack size given must be big enough to hold the call stack and the maximum used local data in the process.

When you start designing a system it is good design practice to define a the stack as big as possible. In a later stage

you can measure the used stack with the SCIOPTA DRUID system level debugger and reduce the stacks if needed.

5.12.1 Unified Interrupt Stack for ARM Architecture

For the ARM architecture a unified interrupt stack can be used in interrupt and timer processes. In this case all in-

terrupt and timer processes share the same stack.

The “unified IRQ stack” checkbox must be selected in the system configuration window of the SCONF utility to

enable this feature. See chapter

16.9 “Configuring Target Systems” on page 16-8.

The stack size given must be big enough to hold the stacks of the interrupt processes with the biggest stack needs

taken in account the interrupt nesting.

5.12.2 Interrupt Nesting for ARM Architecture

If interrupt process nesting is used in the ARM architecture, the maximum nesting level of interrupt processes must

be declared in the system configutation (SCONF). See chapter

16.9 “Configuring Target Systems” on page 16-8.

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CompuLab SBC-X270 Manual de usuario Pagina 52