自己写的关于ucos－2在arm7上的移植代码.txt

压缩包内是ucos在ARM上的移植的一套比较完整的代码

/*
*********************************************************************************************************
*                                               uC/OS-II
*                                         The Real-Time Kernel
*                        
*                                          ARM Specific code
*                                
*                                               ADS1.2
*
*********************************************************************************************************
*/
 
#include "includes.h"

OS_STK *OSTaskStkInit (void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
{   
	OS_STK	 *stk;
    opt   =opt;                                  /* 'opt' is not used, prevent warning  */
    stk   =ptos;                                 /* Load stack pointer（获取堆栈指针）  */
    *stk  =(OS_STK)task;                         /* pc  */
    *--stk=(OS_STK)task;                         /* lr  */
    *--stk=(unsigned int)0;                      /* r12 */
    *--stk=(unsigned int)0;                      /* r11 */
    *--stk=(unsigned int)0;                      /* r10 */
    *--stk=(unsigned int)0;                      /* r9  */
    *--stk=(unsigned int)0;                      /* r8  */
    *--stk=(unsigned int)0;                      /* r7  */
    *--stk=(unsigned int)0;                      /* r6  */
    *--stk=(unsigned int)0;                      /* r5  */
    *--stk=(unsigned int)0;                      /* r4  */ 
    *--stk=(unsigned int)0;                      /* r3  */
    *--stk=(unsigned int)0;                      /* r2  */
    *--stk=(unsigned int)0;                      /* r1  */
    *--stk=(unsigned int)pdata;                  /* r0,第一个参数使用r0传递 */
    *--stk=(unsigned int)USR32Mode;              /* spsr，任务运行在用户模式下  */  
    return (stk);                      
}


void SWI_Exception(int SWI_Num)
{
	switch(SWI_Num)
	{		/*  OS_ENTER_CRITICAL()的代码段  */
		case 0x02:
			__asm
			{
				MRS		R0,SPSR
				ORR		R0,R0,#NoInt
				MSR		SPSR_c,R0
			}			
			break;
			/*  宏 OS_EXIT_CRITICAL()的代码段  */
		case 0x03:								
			__asm
			{
				MRS		R0,SPSR
				BIC		R0,R0,#NoInt
				MSR		SPSR_c,R0
			}			
			break;
			/*  函数ChangeToSYSMode()的代码段  */
		case 0x80:
			__asm
			{
				MRS		R0,SPSR
				BIC		R0,R0,#0X1F
				ORR		R0,R0,#USR32Mode
				MSR		SPSR_c,R0
			}
			break;
			/*  函数ChangeToUSRMode  */
		case 0x81:
			__asm
			{
				MRS		R0,SPSR
				BIC		R0,R0,#0x1F
				ORR		R0,R0,#USR32Mode
				MSR		SPSR_c,R0
			}
			break;
		default:
			break;
	}

}

/* 以下为一些钩子函数，全部为空函数。具体说明请看相关资料 */

#if OS_CPU_HOOKS_EN
/*
*********************************************************************************************************
*                                       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_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_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.
*********************************************************************************************************
*/
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)
{
}

/*
*********************************************************************************************************
*                                           OSTCBInit() HOOK
*
* Description: This function is called by OSTCBInit() 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_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.
*********************************************************************************************************
*/
void OSTimeTickHook (void)
{
}


/*
*********************************************************************************************************
*                                             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_VERSION >= 251
void OSTaskIdleHook (void)
{
}
#endif
#endif
/*********************************************************************************************************
**                            End Of File
*/