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The statistic task is optional in a µC/OS-III application and its presence is controlled by a compile-time configuration constant OS_CFG_STAT_TASK_EN defined in os_cfg.h. Specifically, the code is included in the build when OS_CFG_STAT_TASK_EN is set to 1 DEF_ENABLED.
Also, the priority of this task and the location and size of the statistic task’s stack is configurable via OS_CFG_STAT_TASK_PRIO declared in os_cfg_app.h ().
If the application uses the statistic task, it should call OSStatTaskCPUUsageInit() from the first, and only application task created in the main() function as shown in Listing 5-5the listing below. The startup code should create only one task before calling OSStart(). The single task created is, of course, allowed to create other tasks, but only after calling OSStatTaskCPUUsageInit().