Echelon FTXL Manual do Utilizador descarregar pdf (Página 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.

1 2 ... 170 171 172 173 174 175 176 177 178 179 180 ... 260 261

Sem comentários

Echelon FTXL Manual do Utilizador Página 175