os_cpu_c.c

UCOS在我的MIPS CPU上的移植 1. 这是UCOS在我的MIPS CPU上的移植代码, 编译工具使用标准的MIPS GCC. 2. 所有CPU相关的代码全在start.S中,相关函数说明如

void OSTickISR(unsigned int a,unsigned int b,unsigned long c,unsigned long d,unsigned long e)
{
//	if(!FlagEn)
//		return;	//如果当前中断被屏蔽则返回

	SuspendThread(mainhandle);		//中止主线程的运行，模拟中断产生.但没有保存寄存器
	GetThreadContext(mainhandle, &Context);	//得到主线程上下文，为切换任务做准备

	OSIntNesting++;
	if (OSIntNesting == 1) {
		OSTCBCur->OSTCBStkPtr = (OS_STK *)Context.Esp;	//保存当前esp
	}	
	OSTimeTick();		//ucos内部定时
	OSIntExit();		//由于不能使用中断返回指令，所以此函数是要返回的

	ResumeThread(mainhandle);	//模拟中断返回，主线程得以继续执行
}
#endif

/*$PAGE*/
#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.打印定时信息
				changed by 文佳 Email：[e-mail]
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
void OSTimeTickHook (void)
{

//	_log("   tasktick\n");

}


/*
*********************************************************************************************************
*                                             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.changed by 文佳 Email：[e-mail]
*
* Arguments  : none 
*
* Note(s)    : 1) Interrupts are enabled during this call.
*********************************************************************************************************
*/
#if OS_VERSION >= 251
void OSTaskIdleHook (void)
{
	//Sleep(1);		//这里一定要加上一个短短的延迟，要不会出现错误，
					//具体原因我也不太清楚，不过加上这个的好处是多的，
					//使得整个程序占有很少的cpu
}
#endif

/*
*********************************************************************************************************
*
* 安装中断服务程序
*
*
*********************************************************************************************************
*/
void install_isr_service(void (*isr)(void))
{
	unsigned int	count;
	int				tip;


	//注册入口函数
	install_isr(isr);

	//设置时钟中断
	get_cp0_count(count);
	tip = TIME_PERIC - (0xffffffff - count);
	if(tip < 0)//no wrap
	{
		set_cp0_compare(count + TIME_PERIC);
	}
	else //wrap
	{
		set_cp0_compare(tip);
	}
}

/*
*********************************************************************************************************
*
* 中断服务程序
*
* 进入此处,应该使得 ra 指向被中断的任务处
*********************************************************************************************************
*/
void isr_service_wrap(void)
{
	unsigned int	cause; //避免使用堆栈变量
	unsigned int	count;
	int				tip;

	//中断原因
	get_cp0_cause(cause);
	//clear interrupt
	set_cp0_cause(cause);

	//告诉OS,进入了中断处理程序
	//OSIntEnter();
	OSIntNesting++;

printf("into isr\n");
	if(cause & CAUSE_TIMER)
	{
		//重新设置时钟中断
		get_cp0_count(count);
		tip = TIME_PERIC - (0xffffffff - count);
		if(tip < 0)//no wrap
		{
			set_cp0_compare(count + TIME_PERIC);
		}
		else //wrap
		{
			set_cp0_compare(tip);
		}

		OSTimeTick();
	}

	OSIntExit();

printf("out isr\n");
}

#endif