uCOS51移植心得[社区]

  MOV  A,@R1
        MOV  @R0,A
       
        LJMP OSCtxSw_in
;-------------------------------------------------------------------------
        RSEG ?PR?OSIntCtxSw?OS_CPU_A
       
OSIntCtxSw:

        ;调整SP指针去掉在调用OSIntExit(),OSIntCtxSw()过程中压入堆栈的多余内容
        ;SP=SP-4

        MOV  A,SP
        CLR  C
        SUBB A,#4
        MOV  SP,A
       
        LJMP OSIntCtxSw_in
;-------------------------------------------------------------------------
        CSEG AT 000BH    ;OSTickISR
        LJMP OSTickISR   ;使用定时器0
        RSEG ?PR?OSTickISR?OS_CPU_A

OSTickISR:       
       
        USING 0       
        PUSHALL
       
        CLR  TR0
        MOV  TH0,#70H    ;定义Tick=50次/秒(即0.02秒/次)
        MOV  TL0,#00H    ;OS_CPU_C.C  和  OS_TICKS_PER_SEC
        SETB TR0
       
        LCALL _?OSIntEnter
        LCALL _?OSTimeTick
        LCALL _?OSIntExit
        POPALL       
        RETI
;-------------------------------------------------------------------------
        CSEG AT 0023H    ;串口中断
      

《uCOS51移植心得[社区](第12页)》