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Chapter 13. Implementation Parameters
The implementation parameters provide detailed information concerning the functionality, performance
and memory demand. From the implementation parameters you can obtain valuable information about
the impact of the RTOS on your application.
13.1. Introduction
From the implementation parameters you can obtain valuable information regarding the impact of the
RTOS on your application. There are three kinds of implementation parameters:
• Functionality Implementation Parameters. They relate to the configuration of the system. You should
always take them into account when writing your application.
• Hardware Resources Implementation Parameters. They evaluate the impact of having a RTOS on the
hardware resources of the system (RAM, ROM, interrupts, times, etc).
• Performance Implementation Parameters. They measure the real time response of the RTOS. The
basic conditions to reproduce the measurement of those parameters are mentioned.
13.2. Functionality Implementation Parameters
Parameter
Description
Implementation
MAX_NO_TASK
Maximum number of tasks. Limits
the total number of TASK OIL
objects in the OIL file.
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One task is reserved for the system
idle task
MAX_NO_ACTIVE_TASK
Maximum number of active tasks
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(i.e. not suspended) in the system. The most general scenario is when
all tasks can be 'active' at any given
time, thus all having a stack of their
own.
MAX_NO_PRIO_LEVEL
Maximum number of physical priority
levels. Limits the total number of
TASK OIL objects with different
PRIORITY value.
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The total number of physical priority
levels is calculated by the TOC tool
after processing the application OIL
file.
MAX_TASK_PER_LEVEL
Maximum number of tasks per
priority level.
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The implementation supports the
general case, thus allowing many
ready task in the same priority level.
However, better performance is
achieved when no more than one
task is assigned statically to the
same priority level (smaller context
switch latency times).
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