os_cpu_c.c

基于TI的2407移植的ucos程序范例

/*
*********************************************************************************************************
*                                               uC/OS-II
*                                         The Real-Time Kernel
*
*                        (c) Copyright 1992-1998, Jean J. Labrosse, Plantation, FL
*                                          All Rights Reserved
*
*                                            TMS320LF24x DSP 专用代码
*                                           TI CCS Ver4.10.36仿真软件编译
*
* 文件名 : OS_CPU_C.C
* 作者   : Jean J. Labrosse
* 改编   : 尹叶丹(yinyedan),Postgraduate, [e-mail],2003,8,19
*					Automation School,Wuhan University of Technology   
*********************************************************************************************************
*/

#define  OS_CPU_GLOBALS
#include "includes.h"  
extern void c_int0();

/*
*********************************************************************************************************
*                                        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
*
*              pdata         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_???).
*
* 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
*              PSW to 0x0002 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!
*********************************************************************************************************
*/

void *OSTaskStkInit (void (*task)(void *pd), void *pdata, void *ptos, INT16U opt)
{
    
         
    UWORD *stk;
    opt    = opt;                           /* 'opt' is not used, prevent warning                      */
    stk    = (UWORD *)ptos;                /* Load stack pointer                                      */
    *stk++ = (UWORD)pdata;         		   /* 将数据区地址传递到堆栈中*/
    *stk++ = (UWORD)pdata; 
     stk++ ;                         	   /*留出一个字，任务的汇编代码将把返回地址弹出到这里*/
    *stk++ = (UWORD)0x2000;                /*ST1*/
    *stk++ = (UWORD)0x2200;               	/*ST0*/
    *stk++ = (UWORD)0x0000;                /* 累加器高16位                                 */
    *stk++ = (UWORD)0x0000;         		/* 累加器低16位                   */
    *stk++ = (UWORD)0x0000;                /*乘法寄存器高16位*/ 
    *stk++ = (UWORD)0x0000;                /* 临时寄存器TREG                                            */
    *stk++ = (UWORD)0x0000;                /* 乘法寄存器低16位 */
    //ptos=stk;                                           
    *stk++ = (UWORD)0x0000;                /* AR0 = 0xDDDD                                             */
    *stk++ = (UWORD)0x0000;                /* AR2 = 0xBBBB                                             */
    *stk++ = (UWORD)0x0000;                /* AR3 = 0x0000                                             */
    *stk++ = (UWORD)0x0000;                /* AR4 = 0x1111                                             */
    *stk++ = (UWORD)0x0000;                /* AR5 = 0x2222                                             */
    *stk++ = (UWORD)0x0000;                /* AR6 = 0x3333                                             */
    *stk++ = (UWORD)0x0000;                /* AR7 = 0x4444                                             */
    *stk++ = (UWORD)task;                  /* 中断返回地址=任务其始地址                          */
	*stk++ = (UWORD)c_int0;                  
	*stk++=(UWORD)c_int0;						 
	*stk++=(UWORD)c_int0;
	*stk++=(UWORD)c_int0;
	*stk++=(UWORD)c_int0;
	*stk++=(UWORD)c_int0;   
    *(UWORD*)ptos=(UWORD)ptos;      /*设置帧指针*/
    return (stk);
}

/*$PAGE*/
#if OS_CPU_HOOKS_EN
/*
*********************************************************************************************************
*                                          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.
*********************************************************************************************************
*/
void OSTaskCreateHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                       /* Prevent compiler warning                                     */
}


/*
*********************************************************************************************************
*                                           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.
*********************************************************************************************************
*/
void OSTaskDelHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                       /* Prevent compiler warning                                     */
}

/*
*********************************************************************************************************
*                                           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).
*********************************************************************************************************
*/
void OSTaskSwHook (void)
{
}

/*
*********************************************************************************************************
*                                           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
*********************************************************************************************************
*/
void OSTaskStatHook (void)
{
}

/*
*********************************************************************************************************
*                                               TICK HOOK
*
* Description: This function is called every tick.
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
void OSTimeTickHook (void)
{
}
#endif