os_cpu_c.c

ucos-IIv2.52在TMS320c6416上的移植

/*********************************************************************
*File:		OS_CPU_C.c -  V2.52 port for C6416
*Author: 	Jean J. Labrosse 
*Data:		
*modification history:
*	2006.04.20 rongjie revised OSTaskStkInit() for porting to C6416 
*DESCRIPTION:
	little endian, C code in relation to processor.
*********************************************************************/

/* includes */

#define  OS_CPU_GLOBALS
#include "..\includes.h"

int intCount = 0;
/*
*********************************************************************************************************
*                                        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. 
*********************************************************************************************************
*/
OS_STK	* OSTaskStkInit(void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
{
	int *stk;
	opt = opt;                 /* 'opt' is not used, prevent warning    */
    /*	THE SP MUST BE ALIGNED ON AN 8-BYTE BOUNDARY.*/   
    stk = (int *)( (int)ptos & ~7 );
    *stk-- = (int)task;   /* Put pointer to task */ 
    stk--;	
	*stk-- = 0xA0; 
	*stk-- = 0xA1; 
	*stk-- = 0xA2;
	*stk-- = 0xA3; 
	*stk-- = (int)pdata; /* the first argument of C function here*/
	*stk-- = 0xA5; 
	*stk-- = 0xA6; 
	*stk-- = 0xA7; 
	*stk-- = 0xA8; 
	*stk-- = 0xA9; 
	*stk-- = 0xA10; 
	*stk-- = 0xA11;  
	*stk-- = 0xA12; 
	*stk-- = 0xA13; 
	*stk-- = 0xA14;
	*stk-- = 0xA15; 
	*stk-- = 0xA16; 
	*stk-- = 0xA17; 
	*stk-- = 0xA18; 
	*stk-- = 0xA19; 
	*stk-- = 0xA20; 
	*stk-- = 0xA21; 
	*stk-- = 0xA22; 
	*stk-- = 0xA23;
	*stk-- = 0xA24; 
	*stk-- = 0xA25; 
	*stk-- = 0xA26;
	*stk-- = 0xA27; 
	*stk-- = 0xA28; 
	*stk-- = 0xA29; 
	*stk-- = 0xA30; 
	*stk-- = 0xA31; 
	*stk-- = 0xB0; 
	*stk-- = 0xB1; 
	*stk-- = 0xB2;
//B3 has been saved at the beginning
	*stk-- = 0xB4; 
	*stk-- = 0xB5; 
	*stk-- = 0xB6; 
	*stk-- = 0xB7; 
	*stk-- = 0xB8; 
	*stk-- = 0xB9; 
	*stk-- = 0xB10; 
	*stk-- = 0xB11;  
	*stk-- = 0xB12; 
	*stk-- = 0xB13; 
	*stk-- = DSP_C6x_GetCurrentDP(); /* Save current data pointer */
//b15 is saved in TCB
	*stk-- = 0xB16; 
	*stk-- = 0xB17; 
	*stk-- = 0xB18; 
	*stk-- = 0xB19; 
	*stk-- = 0xB20; 
	*stk-- = 0xB21; 
	*stk-- = 0xB22; 
	*stk-- = 0xB23;
	*stk-- = 0xB24; 
	*stk-- = 0xB25; 
	*stk-- = 0xB26;
	*stk-- = 0xB27; 
	*stk-- = 0xB28; 
	*stk-- = 0xB29; 
	*stk-- = 0xB30; 
	*stk-- = 0xB31; 
	*stk-- = 0x0;		/* AMR  default value as it was after reset*/
	*stk-- = 0x0102;	/* CSR  Little Endian(bit8 = 1); PGIE set 1; 
  	GIE set 0 to prevent interrupt when call OSStartHighRdy in OS_Start*/
	      
	//*stk-- = 0x02;        /* IER  Just set the NMIF bit */   
	*stk-- = (int)task;   	/* IRP  Put pointer to task */ 
	*stk-- = 0xAA;			/* make SP on an 8-bytes boundary */
    //stk--;	make SP on an 8-bytes boundary    
	return ( (OS_STK *)stk );
}

/*
*********************************************************************************************************
*                                       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)
{
    ptcb = ptcb;                       /* Prevent compiler warning                                     */
}
#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
/*
*********************************************************************************************************
*                                           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 
void  OSTaskSwHook (void)
{
}
#endif

/*
*********************************************************************************************************
*                                           OSTCBInit() 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 
void  OSTimeTickHook (void)
{	
}
#endif


/*********************************************************************************************************
*                                           HANDLE TIMER TICK ISR
*										   - void OSTickISR(void) -
*
* Description: This function is the C6x-DSP Timer0 ISR. And the timer tick should be 10~100 /sec.
*				It also offers the time tick to uC/OS-II.
**********************************************************************************************************
*/
void OSTickISR(void)
{
	intCount++;
	ctwSave();
	OSIntEnter();
	if (OSIntNesting == 1)
		{
			OSTCBCur->OSTCBStkPtr = (OS_STK *) DSP_C6x_GetCurrentSP();
		}
			
	/* You can enable Interrupt again here, 
		if want to use nested interrupt..... */
	
	OSTimeTick();
	OSIntExit();
	ctwRest();
	//asm ("	nop	5"); //important! 
			// this can avoid a stack error when compile with the optimization!
}