text: /*
  *********************************************************************************************************
  *                                               uC/OS-II
  *                                         The Real-Time Kernel
  *
  *
  *                                (c) Copyright 2006, Micrium, Weston, FL
  *                                          All Rights Reserved
  *
  *                                           ARM Cortex-M3 Port
  *
  * File      : OS_CPU_C.C
  * Version   : V2.86
  * By        : Jean J. Labrosse
  *
  * For       : ARMv7M Cortex-M3
  * Mode      : Thumb2
  * Toolchain : RealView Development Suite
  *             RealView Microcontroller Development Kit (MDK)
  *             ARM Developer Suite (ADS)
  *             Keil uVision
  *********************************************************************************************************
  */
  
  #define  OS_CPU_GLOBALS
  
  #include "includes.h"
  /*
  *********************************************************************************************************
  *                                          LOCAL VARIABLES
  *********************************************************************************************************
  */
  
  #if OS_TMR_EN > 0
  static  INT16U  OSTmrCtr;
  #endif
  
  
  /*
  *********************************************************************************************************
  *                                       OS INITIALIZATION HOOK
  *                                            (BEGINNING)
  *
  * Description: This function is called by OSInit() at the beginning of OSInit().
  *
  * Arguments  : none
  *
  * Note(s)    : 1) Interrupts should be disabled during this call.
  *********************************************************************************************************
  */
  #if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203
  void  OSInitHookBegin (void)
  {
  #if OS_TMR_EN > 0
      OSTmrCtr = 0;
  #endif
  }
  #endif
  
  /*
  *********************************************************************************************************
  *                                       OS INITIALIZATION HOOK
  *                                               (END)
  *
  * Description: This function is called by OSInit() at the end of OSInit().
  *
  * Arguments  : none
  *
  * Note(s)    : 1) Interrupts should be disabled during this call.
  *********************************************************************************************************
  */
  #if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203
  void  OSInitHookEnd (void)
  {
  }
  #endif
  
  /*
  *********************************************************************************************************
  *                                          TASK CREATION HOOK
  *
  * Description: This function is called when a task is created.
  *
  * Arguments  : ptcb   is a pointer to the task control block of the task being created.
  *
  * Note(s)    : 1) Interrupts are disabled during this call.
  *********************************************************************************************************
  */
  #if OS_CPU_HOOKS_EN > 0
  void  OSTaskCreateHook (OS_TCB *ptcb)
  {
  #if OS_APP_HOOKS_EN > 0
      App_TaskCreateHook(ptcb);
  #else
      (void)ptcb;                                  /* Prevent compiler warning                           */
  #endif
  }
  #endif
  
  
  /*
  *********************************************************************************************************
  *                                           TASK DELETION HOOK
  *
  * Description: This function is called when a task is deleted.
  *
  * Arguments  : ptcb   is a pointer to the task control block of the task being deleted.
  *
  * Note(s)    : 1) Interrupts are disabled during this call.
  *********************************************************************************************************
  */
  #if OS_CPU_HOOKS_EN > 0
  void  OSTaskDelHook (OS_TCB *ptcb)
  {
  #if OS_APP_HOOKS_EN > 0
      App_TaskDelHook(ptcb);
  #else
      (void)ptcb;                                  /* Prevent compiler warning                           */
  #endif
  }
  #endif
  
  /*
  *********************************************************************************************************
  *                                             IDLE TASK HOOK
  *
  * Description: This function is called by the idle task.  This hook has been added to allow you to do
  *              such things as STOP the CPU to conserve power.
  *
  * Arguments  : none
  *
  * Note(s)    : 1) Interrupts are enabled during this call.
  *********************************************************************************************************
  */
  #if OS_CPU_HOOKS_EN > 0 && OS_VERSION >= 251
  void  OSTaskIdleHook (void)
  {
  #if OS_APP_HOOKS_EN > 0
      App_TaskIdleHook();
  #endif
  }
  #endif
  
  /*
  *********************************************************************************************************
  *                                           STATISTIC TASK HOOK
  *
  * Description: This function is called every second by uC/OS-II's statistics task.  This allows your
  *              application to add functionality to the statistics task.
  *
  * Arguments  : none
  *********************************************************************************************************
  */
  
  #if OS_CPU_HOOKS_EN > 0
  void  OSTaskStatHook (void)
  {
  #if OS_APP_HOOKS_EN > 0
      App_TaskStatHook();
  #endif
  }
  #endif
  
  /*
  *********************************************************************************************************
  *                                        INITIALIZE A TASK'S STACK
  *
  * Description: This function is called by either OSTaskCreate() or OSTaskCreateExt() to initialize the
  *              stack frame of the task being created.  This function is highly processor specific.
  *
  * Arguments  : task          is a pointer to the task code
  *
  *              p_arg         is a pointer to a user supplied data area that will be passed to the task
  *                            when the task first executes.
  *
  *              ptos          is a pointer to the top of stack.  It is assumed that 'ptos' points to
  *                            a 'free' entry on the task stack.  If OS_STK_GROWTH is set to 1 then
  *                            'ptos' will contain the HIGHEST valid address of the stack.  Similarly, if
  *                            OS_STK_GROWTH is set to 0, the 'ptos' will contains the LOWEST valid address
  *                            of the stack.
  *
  *              opt           specifies options that can be used to alter the behavior of OSTaskStkInit().
  *                            (see uCOS_II.H for OS_TASK_OPT_xxx).
  *
  * Returns    : Always returns the location of the new top-of-stack once the processor registers have
  *              been placed on the stack in the proper order.
  *
  * Note(s)    : 1) Interrupts are enabled when your task starts executing.
  *              2) All tasks run in Thread mode, using process stack.
  *********************************************************************************************************
  */
  OS_STK *OSTaskStkInit (void (*task)(void *p_arg), void *p_arg, OS_STK *ptos, INT16U opt)
  {
      OS_STK *stk;
  
  
      (void)opt;                                   /* 'opt' is not used, prevent warning                 */
      stk       = ptos;                            /* Load stack pointer                                 */
  
                                                   /* Registers stacked as if auto-saved on exception    */
      *(stk)    = (INT32U)0x01000000L;             /* xPSR                                               */
      *(--stk)  = (INT32U)task;                    /* Entry Point                                        */
      *(--stk)  = (INT32U)0xFFFFFFFEL;             /* R14 (LR) (init value will cause fault if ever used)*/
      *(--stk)  = (INT32U)0x12121212L;             /* R12                                                */
      *(--stk)  = (INT32U)0x03030303L;             /* R3                                                 */
      *(--stk)  = (INT32U)0x02020202L;             /* R2                                                 */
      *(--stk)  = (INT32U)0x01010101L;             /* R1                                                 */
      *(--stk)  = (INT32U)p_arg;                   /* R0 : argument                                      */
  
                                                   /* Remaining registers saved on process stack         */
      *(--stk)  = (INT32U)0x11111111L;             /* R11                                                */
      *(--stk)  = (INT32U)0x10101010L;             /* R10                                                */
      *(--stk)  = (INT32U)0x09090909L;             /* R9                                                 */
      *(--stk)  = (INT32U)0x08080808L;             /* R8                                                 */
      *(--stk)  = (INT32U)0x07070707L;             /* R7                                                 */
      *(--stk)  = (INT32U)0x06060606L;             /* R6                                                 */
      *(--stk)  = (INT32U)0x05050505L;             /* R5                                                 */
      *(--stk)  = (INT32U)0x04040404L;             /* R4                                                 */
  
      return (stk);
  }
  
  /*
  *********************************************************************************************************
  *                                           TASK SWITCH HOOK
  *
  * Description: This function is called when a task switch is performed.  This allows you to perform other
  *              operations during a context switch.
  *
  * Arguments  : none
  *
  * Note(s)    : 1) Interrupts are disabled during this call.
  *              2) It is assumed that the global pointer 'OSTCBHighRdy' points to the TCB of the task that
  *                 will be 'switched in' (i.e. the highest priority task) and, 'OSTCBCur' points to the
  *                 task being switched out (i.e. the preempted task).
  *********************************************************************************************************
  */
  #if (OS_CPU_HOOKS_EN > 0) && (OS_TASK_SW_HOOK_EN > 0)
  void  OSTaskSwHook (void)
  {
  #if OS_APP_HOOKS_EN > 0
      App_TaskSwHook();
  #endif
  }
  #endif
  
  /*
  *********************************************************************************************************
  *                                           OS_TCBInit() HOOK
  *
  * Description: This function is called by OS_TCBInit() after setting up most of the TCB.
  *
  * Arguments  : ptcb    is a pointer to the TCB of the task being created.
  *
  * Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
  *********************************************************************************************************
  */
  #if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203
  void  OSTCBInitHook (OS_TCB *ptcb)
  {
  #if OS_APP_HOOKS_EN > 0
      App_TCBInitHook(ptcb);
  #else
      (void)ptcb;                                  /* Prevent compiler warning                           */
  #endif
  }
  #endif
  
  
  /*
  *********************************************************************************************************
  *                                               TICK HOOK
  *
  * Description: This function is called every tick.
  *
  * Arguments  : none
  *
  * Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
  *********************************************************************************************************
  */
  #if (OS_CPU_HOOKS_EN > 0) && (OS_TIME_TICK_HOOK_EN > 0)
  void  OSTimeTickHook (void)
  {
  #if OS_APP_HOOKS_EN > 0
      App_TimeTickHook();
  #endif
  
  #if OS_TMR_EN > 0
      OSTmrCtr++;
      if (OSTmrCtr >= (OS_TICKS_PER_SEC / OS_TMR_CFG_TICKS_PER_SEC)) {
          OSTmrCtr = 0;
          OSTmrSignal();
      }
  #endif
  }
  #endif
  
  #if OS_CPU_HOOKS_EN > 0u && OS_VERSION > 290u 
  
  void OSTaskReturnHook(OS_TCB *ptcb)
  { 
  	(void)ptcb; 
  } 
  
  #endif
  
  
  
  
  
  
  /*----------------------- (C) COPYRIGHT @ 2012 liycobl -----------------  end of file -----------------*/
  