os_tickisr.asm

DSP_UCOS_run_in_flash_nonBIOS

.page
.text
_OSTickISR:
	.ref _OSTimeTick
	.ref _OSIntEnter
    .ref _OSTCBCur
    .ref _OSIntExit
    .ref _OSIntCtxFlag
    .ref _OSIntCtxSwExe
	.ref _PieCtrlRegs
  	.global _OSTickISR	
    
	PUSH RPC
;	 PUSH	XAR7
;	 PUSH	XAR6
;	 PUSH	XAR5
;	 PUSH	XAR4
;	 PUSH	XAR3
;	 PUSH	XAR2
;	 PUSH	AR1H:AR0H
;	 PUSH  	XT 

    CLRC      PAGE0,OVM
	
    ;MOV       AL,  #0X01
	;MOV       *(0:0xce1), @AL       ;手动清除中断应答寄存器中标志位
    MOVW      DP,#_PieCtrlRegs+1
    MOV       @_PieCtrlRegs+1,#1;PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
	
	;MOVW      DP,#_OSIntNesting     ;提示uc/OS-II 进入中断
    ;INC       @_OSIntNesting        ;     
    
    LCR _OSIntEnter
    LCR _OSTimeTick    
    LCR _OSIntExit	
     
                                         ;判断是否有抢占发生，有则进行任务切换
    CMP @_OSIntCtxFlag, #1		     ;并保存本次任务的现场
    SB  BACK, NEQ
    
    MOVW     DP,#_OSTCBCur	          ; OSTCBCur->OSTCBStkPtr = SP
    MOVL     XAR4,@_OSTCBCur          ; 
    MOV      AL,SP     
    MOV      *+XAR4[0],AL             ; SAVE the context
    
    SUB @_OSIntCtxFlag, #1            ;CLEAR THE _OSIntCtxFlag
    LC       _OSIntCtxSwExe
 ;  NASP

    
BACK:  
 	POP  RPC
  ;  POP AR1H:AR0H
  ;  POP	XAR2
  ;  POP	XAR3
 ;   POP	XAR4
 ;   POP	XAR5
;    POP	XAR6
;    POP	XAR7
    IRET
	.end