8-bit MCUs Can Also Run RTOS
The 8051 from forty years ago can also run RTOS, but look at its performance and RAM resources. The RTOS running on 8051 has very few implemented functions, and after running RTOS, the application code (or the number of tasks) will be limited.
RTOS Supports Trimming
What is system trimming?
-
FreeRTOS’s FreeRTOSConfig.h file -
ucos’s os_cfg.h file -
……
#ifndef OS_CFG_H#define OS_CFG_H
/* --------------------------- MISCELLANEOUS --------------------------- */
#define OS_CFG_APP_HOOKS_EN 1u /* Enable (1) or Disable (0) application specific hooks */
#define OS_CFG_ARG_CHK_EN 1u /* Enable (1) or Disable (0) argument checking */
#define OS_CFG_CALLED_FROM_ISR_CHK_EN 1u /* Enable (1) or Disable (0) check for called from ISR */
#define OS_CFG_DBG_EN 0u /* Enable (1) or Disable (0) debug code/variables */
#define OS_CFG_TICK_EN 1u /* Enable (1) or Disable (0) the kernel tick */
#define OS_CFG_DYN_TICK_EN 0u /* Enable (1) or Disable (0) the Dynamic Tick */
#define OS_CFG_INVALID_OS_CALLS_CHK_EN 1u /* Enable (1) or Disable (0) checks for invalid kernel calls */
#define OS_CFG_OBJ_TYPE_CHK_EN 1u /* Enable (1) or Disable (0) object type checking */
#define OS_CFG_OBJ_CREATED_CHK_EN 1u /* Enable (1) or Disable (0) object created checks */
#define OS_CFG_TS_EN 0u /* Enable (1) or Disable (0) time stamping */
#define OS_CFG_PRIO_MAX 64u /* Defines the maximum number of task priorities (see OS_PRIO data type) */
#define OS_CFG_SCHED_LOCK_TIME_MEAS_EN 0u /* Include code to measure scheduler lock time */
#define OS_CFG_SCHED_ROUND_ROBIN_EN 1u /* Include code for Round-Robin scheduling */
#define OS_CFG_STK_SIZE_MIN 64u /* Minimum allowable task stack size */
/* --------------------------- EVENT FLAGS ----------------------------- */
#define OS_CFG_FLAG_EN 1u /* Enable (1) or Disable (0) code generation for EVENT FLAGS */
#define OS_CFG_FLAG_DEL_EN 1u /* Include code for OSFlagDel() */
#define OS_CFG_FLAG_MODE_CLR_EN 1u /* Include code for Wait on Clear EVENT FLAGS */
#define OS_CFG_FLAG_PEND_ABORT_EN 1u /* Include code for OSFlagPendAbort() */
/* ------------------------ MEMORY MANAGEMENT ------------------------- */
#define OS_CFG_MEM_EN 1u /* Enable (1) or Disable (0) code generation for the MEMORY MANAGER */
/* ------------------- MUTUAL EXCLUSION SEMAPHORES -------------------- */
#define OS_CFG_MUTEX_EN 1u /* Enable (1) or Disable (0) code generation for MUTEX */
#define OS_CFG_MUTEX_DEL_EN 1u /* Include code for OSMutexDel() */
#define OS_CFG_MUTEX_PEND_ABORT_EN 1u /* Include code for OSMutexPendAbort() */
/* -------------------------- MESSAGE QUEUES -------------------------- */
#define OS_CFG_Q_EN 1u /* Enable (1) or Disable (0) code generation for QUEUES */
#define OS_CFG_Q_DEL_EN 1u /* Include code for OSQDel() */
#define OS_CFG_Q_FLUSH_EN 1u /* Include code for OSQFlush() */
#define OS_CFG_Q_PEND_ABORT_EN 1u /* Include code for OSQPendAbort() */
/* ---------------------------- SEMAPHORES ----------------------------- */
#define OS_CFG_SEM_EN 1u /* Enable (1) or Disable (0) code generation for SEMAPHORES */
#define OS_CFG_SEM_DEL_EN 1u /* Include code for OSSemDel() */
#define OS_CFG_SEM_PEND_ABORT_EN 1u /* Include code for OSSemPendAbort() */
#define OS_CFG_SEM_SET_EN 1u /* Include code for OSSemSet() */
/* -------------------------- TASK MANAGEMENT -------------------------- */
#define OS_CFG_STAT_TASK_EN 1u /* Enable (1) or Disable (0) the statistics task */
#define OS_CFG_STAT_TASK_STK_CHK_EN 1u /* Check task stacks from the statistic task */
#define OS_CFG_TASK_CHANGE_PRIO_EN 1u /* Include code for OSTaskChangePrio() */
#define OS_CFG_TASK_DEL_EN 1u /* Include code for OSTaskDel() */
#define OS_CFG_TASK_IDLE_EN 1u /* Include the idle task */
#define OS_CFG_TASK_PROFILE_EN 1u /* Include variables in OS_TCB for profiling */
#define OS_CFG_TASK_Q_EN 1u /* Include code for OSTaskQXXXX() */
#define OS_CFG_TASK_Q_PEND_ABORT_EN 1u /* Include code for OSTaskQPendAbort() */
#define OS_CFG_TASK_REG_TBL_SIZE 1u /* Number of task specific registers */
#define OS_CFG_TASK_STK_REDZONE_EN 0u /* Enable (1) or Disable (0) stack redzone */
#define OS_CFG_TASK_STK_REDZONE_DEPTH 8u /* Depth of the stack redzone */
#define OS_CFG_TASK_SEM_PEND_ABORT_EN 1u /* Include code for OSTaskSemPendAbort() */
#define OS_CFG_TASK_SUSPEND_EN 1u /* Include code for OSTaskSuspend() and OSTaskResume() */
/* ------------------ TASK LOCAL STORAGE MANAGEMENT ------------------- */
#define OS_CFG_TLS_TBL_SIZE 0u /* Include code for Task Local Storage (TLS) registers */
/* ------------------------- TIME MANAGEMENT -------------------------- */
#define OS_CFG_TIME_DLY_HMSM_EN 1u /* Include code for OSTimeDlyHMSM() */
#define OS_CFG_TIME_DLY_RESUME_EN 1u /* Include code for OSTimeDlyResume() */
/* ------------------------- TIMER MANAGEMENT -------------------------- */
#define OS_CFG_TMR_EN 1u /* Enable (1) or Disable (0) code generation for TIMERS */
#define OS_CFG_TMR_DEL_EN 1u /* Enable (1) or Disable (0) code generation for OSTmrDel() */
/* ------------------------- TRACE RECORDER ---------------------------- */
#define OS_CFG_TRACE_EN 0u /* Enable (1) or Disable (0) uC/OS-III Trace instrumentation */
#define OS_CFG_TRACE_API_ENTER_EN 0u /* Enable (1) or Disable (0) uC/OS-III Trace API enter instrumentation */
#define OS_CFG_TRACE_API_EXIT_EN 0u /* Enable (1) or Disable (0) uC/OS-III Trace API exit instrumentation */
#endif
What Are the Requirements for Running RTOS on MCU?
Looking back, what do you think are the requirements for running RTOS on MCU?
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