os_cpu_c.c

来自「uCOS-II工程文件,使用ICC编译。」· C语言 代码 · 共 290 行

/*
*********************************************************************************************************
*                                              uC/OS-II
*                                        The Real-Time Kernel
* 
*                                       ATmega128 Specific code
*
* File     : OS_CPU_C.C
* By       : Ole Saether
*            Jean J. Labrosse
*********************************************************************************************************
*/

#define  OS_CPU_GLOBALS
#include <includes.h>

/*
*********************************************************************************************************
*                                       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)
{
}
#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

/*$PAGE*/
/*
*********************************************************************************************************
*                                          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)
{
#ifdef OS_VIEW_MODULE
    OSView_TaskCreateHook(ptcb);
#else
    ptcb = 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)
{
    ptcb = ptcb;                       /* Prevent compiler warning                                     */
}
#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)
{
}
#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)
{
}
#endif

/*$PAGE*/
/*
**********************************************************************************************************
*                                       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 the
*                            highest valid address on the stack.
*
*              opt           specifies options that can be used to alter the behavior of OSTaskStkInit().
*                            (see uCOS_II.H for OS_TASK_OPT_???).
*
* 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)    : Interrupts are enabled when your task starts executing. You can change this by setting the
*              SREG to 0x00 instead. In this case, interrupts would be disabled upon task startup. The
*              application code would be responsible for enabling interrupts at the beginning of the task
*              code. You will need to modify OSTaskIdle() and OSTaskStat() so that they enable interrupts.
*              Failure to do this will make your system crash!
*
*              The AVR return stack is placed OS_TASK_HARD_STK_SIZE bytes before the bottom of the task's
*              stack.
*
*              (1) IMPORTANT: The ICC compiler handles function pointers by actually passing the pointer
*                             to a location in Flash that actually contains the pointer to the function.
**********************************************************************************************************
*/

OS_STK *OSTaskStkInit (void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt){
    
	INT8U  *stk;
    INT8U  *stks;		// Temp. variable used for setting up AVR hardware stack
    INT16U tmp;


    opt     = opt;			// 'opt' is not used, prevent warning
    stk     = (INT8U *)ptos;		// Wandlung von ptos in Bytezeiger
	// AVR return stack ("hardware stack")
    stks    = (INT8U *)(ptos)-(OS_TASK_STK_SIZE-32);

	// the function address has an extra level of indirection. Fetch the
    // actual address.
    //    
    tmp = *(INT16U const *)task;
   
	// 36 Bytes
    *stks-- = (INT8U)tmp;	//Put task start address on top of hardware stack
    *stks-- = (INT8U)(tmp >> 8);

    *stk-- = (INT8U)0x00;		// R0  = 0x00
    *stk-- = (INT8U)0x01; 
    *stk-- = (INT8U)0x02;
    *stk-- = (INT8U)0x03;
    *stk-- = (INT8U)0x04;
    *stk-- = (INT8U)0x05;
    *stk-- = (INT8U)0x06;
    *stk-- = (INT8U)0x07;
    *stk-- = (INT8U)0x08;
    *stk-- = (INT8U)0x09;
    *stk-- = (INT8U)0x10;
    *stk-- = (INT8U)0x11;
    *stk-- = (INT8U)0x12;
    *stk-- = (INT8U)0x13;
    *stk-- = (INT8U)0x14;
    *stk-- = (INT8U)0x15;
    tmp    = (INT16U)pdata;
    *stk-- = (INT8U)tmp;	//Simulate call to function with argument
    *stk-- = (INT8U)(tmp >> 8);
    *stk-- = (INT8U)0x18;
    *stk-- = (INT8U)0x19;
    *stk-- = (INT8U)0x20;
    *stk-- = (INT8U)0x21;
    *stk-- = (INT8U)0x22;
    *stk-- = (INT8U)0x23;
    *stk-- = (INT8U)0x24;
    *stk-- = (INT8U)0x25;
    *stk-- = (INT8U)0x26;
    *stk-- = (INT8U)0x27;
	// the heap pointer Y=R29:R28 will not be stored
    *stk-- = (INT8U)0x30;
    *stk-- = (INT8U)0x31;
//    *stk-- = (INT8U)0x3B;
    *stk-- = (INT8U)0x80;	//SREG = Interrupts enabled

    tmp    = (INT16U)(stks);
    *stk-- = (INT8U)(tmp >> 8);
    *stk   = (INT8U)(tmp);
    return ((void *)stk);
}
/*$PAGE*/
/*
*********************************************************************************************************
*                                           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)
{
#ifdef OS_VIEW_MODULE
    OSView_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)
{
    ptcb = ptcb;                                           /* Prevent Compiler warning                 */
}
#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)
{
#ifdef OS_VIEW_MODULE
    OSView_TickHook();
#endif
}
#endif