www.pudn.com > ucosii_for_m128_template.rar > os_cpu_c.c, change:2004-12-06,size:13678b


/* 
********************************************************************************************************* 
*                                              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 *p_arg, OS_STK *ptos, INT16U opt) 
{ 
    INT8U  *psoft_stk; 
    INT8U  *phard_stk;                      /* Temp. variable used for setting up AVR hardware stack    */ 
    INT16U  tmp; 
 
 
    opt          = opt;                     /* 'opt' is not used, prevent warning                       */ 
    psoft_stk    = (INT8U *)ptos; 
    phard_stk    = (INT8U *)ptos 
                 - OSTaskStkSize            /* Task stack size                                          */ 
                 + OSTaskHardStkSize;       /* AVR return stack ("hardware stack")                      */ 
 
    tmp          = *(INT16U const *)task;   /* (1) ICC compiler handles function pointers indirectly!   */ 
 
    *phard_stk-- = (INT8U)tmp;              /* Put task start address on top of "hardware stack"        */ 
    *phard_stk-- = (INT8U)(tmp >> 8); 
 
    *psoft_stk-- = (INT8U)0x00;             /* R0    = 0x00                                             */ 
    *psoft_stk-- = (INT8U)0x01;             /* R1    = 0x01                                             */ 
    *psoft_stk-- = (INT8U)0x02;             /* R2    = 0x02                                             */ 
    *psoft_stk-- = (INT8U)0x03;             /* R3    = 0x03                                             */ 
    *psoft_stk-- = (INT8U)0x04;             /* R4    = 0x04                                             */ 
    *psoft_stk-- = (INT8U)0x05;             /* R5    = 0x05                                             */ 
    *psoft_stk-- = (INT8U)0x06;             /* R6    = 0x06                                             */ 
    *psoft_stk-- = (INT8U)0x07;             /* R7    = 0x07                                             */ 
    *psoft_stk-- = (INT8U)0x08;             /* R8    = 0x08                                             */ 
    *psoft_stk-- = (INT8U)0x09;             /* R9    = 0x09                                             */ 
    *psoft_stk-- = (INT8U)0x10;             /* R10   = 0x10                                             */ 
    *psoft_stk-- = (INT8U)0x11;             /* R11   = 0x11                                             */ 
    *psoft_stk-- = (INT8U)0x12;             /* R12   = 0x12                                             */ 
    *psoft_stk-- = (INT8U)0x13;             /* R13   = 0x13                                             */ 
    *psoft_stk-- = (INT8U)0x14;             /* R14   = 0x14                                             */ 
    *psoft_stk-- = (INT8U)0x15;             /* R15   = 0x15                                             */ 
    tmp          = (INT16U)p_arg; 
    *psoft_stk-- = (INT8U)tmp;              /* 'p_arg' passed in R17:R16                                */ 
    *psoft_stk-- = (INT8U)(tmp >> 8); 
    *psoft_stk-- = (INT8U)0x18;             /* R18   = 0x18                                             */ 
    *psoft_stk-- = (INT8U)0x19;             /* R19   = 0x19                                             */ 
    *psoft_stk-- = (INT8U)0x20;             /* R20   = 0x20                                             */ 
    *psoft_stk-- = (INT8U)0x21;             /* R21   = 0x21                                             */ 
    *psoft_stk-- = (INT8U)0x22;             /* R22   = 0x22                                             */ 
    *psoft_stk-- = (INT8U)0x23;             /* R23   = 0x23                                             */ 
    *psoft_stk-- = (INT8U)0x24;             /* R24   = 0x24                                             */ 
    *psoft_stk-- = (INT8U)0x25;             /* R25   = 0x25                                             */ 
    *psoft_stk-- = (INT8U)0x26;             /* R26   = 0x26                                             */ 
    *psoft_stk-- = (INT8U)0x27;             /* R27   = 0x27                                             */ 
                                            /* R28     R29:R28 is the software stack which gets ...     */ 
                                            /* R29     ... stored in the task's OS_TCB.                 */ 
    *psoft_stk-- = (INT8U)0x30;             /* R30   = 0x30                                             */ 
    *psoft_stk-- = (INT8U)0x31;             /* R31   = 0x31                                             */ 
    *psoft_stk-- = (INT8U)0x00;             /* RAMPZ = 0x00                                             */ 
    *psoft_stk-- = (INT8U)0x80;             /* SREG  = Interrupts enabled                               */ 
    tmp          = (INT16U)phard_stk; 
    *psoft_stk-- = (INT8U)(tmp >> 8);       /* SPH                                                      */ 
    *psoft_stk   = (INT8U) tmp;             /* SPL                                                      */ 
    return ((void *)psoft_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