Echelon FTXL - Manual (Page 175)

FTXL User’s Guide 163
OS_LOW_APPLICATION_PRIORITY_BASE Defines the highest OS priority used for
application tasks running at a lower priority
than any FTXL LonTalk protocol stack
tasks.
Figure 14. Relationships among the Macros for Operating System Task Priorities
The number of reserved priorities is controlled by the following macros:
• NUM_RESERVED_HIGH_PRIORITY_APPLICATION_TASKS (defines
the number of high priority application tasks, and defaults to 0)
• NUM_RESERVED_APPLICATION_PRIORITIES (defines the number of
normal application tasks, and defaults to 1)
The number of application tasks that can run at lower priority than any of the
FTXL tasks is limited only by the number of priorities supported by the operating
system (or for some some operating systems, such as the Micrium μC/OS-II
operating system, the lowest assignable priority).
You must define at least one application task, typically with priority
OS_APPLICATION_PRIORITY_BASE. To support more than one application
task of medium priority, you must override the definition of
NUM_RESERVED_APPLICATION_PRIORITIES. Modify this definition by
performing either of the following tasks:
• Modify the definition of the
NUM_RESERVED_APPLICATION_PRIORITIES macro in the
FtxlOsal.h file
• Define the NUM_RESERVED_APPLICATION_PRIORITIES macro in
the defined symbols section of your application project’s preprocessor
definitions, as shown in Figure 15 on page 164.