📄 os_cpu_a.asm
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;//----------------------------------------------------------------
$NOMOD51
NAME OS_CPU_A
;//----------------------------------------------------------------
P0 DATA 080H
P1 DATA 090H
P2 DATA 0A0H
P3 DATA 0B0H
T0 BIT 0B0H.4
AC BIT 0D0H.6
T1 BIT 0B0H.5
T2 BIT 090H.0
EA BIT 0A8H.7
IE DATA 0A8H
EXF2 BIT 0C8H.6
RD BIT 0B0H.7
ES BIT 0A8H.4
IP DATA 0B8H
RI BIT 098H.0
INT0 BIT 0B0H.2
CY BIT 0D0H.7
TI BIT 098H.1
INT1 BIT 0B0H.3
RCAP2H DATA 0CBH
PS BIT 0B8H.4
SP DATA 081H
T2EX BIT 090H.1
OV BIT 0D0H.2
RCAP2L DATA 0CAH
C_T2 BIT 0C8H.1
WR BIT 0B0H.6
RCLK BIT 0C8H.5
TCLK BIT 0C8H.4
SBUF DATA 099H
PCON DATA 087H
SCON DATA 098H
TMOD DATA 089H
TCON DATA 088H
IE0 BIT 088H.1
IE1 BIT 088H.3
B DATA 0F0H
CP_RL2 BIT 0C8H.0
ACC DATA 0E0H
ET0 BIT 0A8H.1
ET1 BIT 0A8H.3
TF0 BIT 088H.5
ET2 BIT 0A8H.5
TF1 BIT 088H.7
TF2 BIT 0C8H.7
RB8 BIT 098H.2
TH0 DATA 08CH
EX0 BIT 0A8H.0
IT0 BIT 088H.0
TH1 DATA 08DH
TB8 BIT 098H.3
EX1 BIT 0A8H.2
IT1 BIT 088H.2
TH2 DATA 0CDH
P BIT 0D0H.0
SM0 BIT 098H.7
TL0 DATA 08AH
SM1 BIT 098H.6
TL1 DATA 08BH
SM2 BIT 098H.5
TL2 DATA 0CCH
PT0 BIT 0B8H.1
PT1 BIT 0B8H.3
RS0 BIT 0D0H.3
PT2 BIT 0B8H.5
TR0 BIT 088H.4
RS1 BIT 0D0H.4
TR1 BIT 088H.6
TR2 BIT 0C8H.2
PX0 BIT 0B8H.0
PX1 BIT 0B8H.2
DPH DATA 083H
DPL DATA 082H
EXEN2 BIT 0C8H.3
REN BIT 098H.4
T2CON DATA 0C8H
RXD BIT 0B0H.0
TXD BIT 0B0H.1
F0 BIT 0D0H.5
PSW DATA 0D0H
;//----------------------------------------------------------------
?PR?OSStartHighRdy?OS_CPU_A SEGMENT CODE
?PR?OSCtxSw?OS_CPU_A SEGMENT CODE
?PR?OSIntCtxSw?OS_CPU_A SEGMENT CODE
?PR?OSTickISR?OS_CPU_A SEGMENT CODE
;//----------------------------------------------------------------
?PR?_EXTERN_0_ISR_?OS_CPU_A SEGMENT CODE
?PR?_EXTERN_1_ISR_?OS_CPU_A SEGMENT CODE
?PR?_TIME_1_ISR_?OS_CPU_A SEGMENT CODE
?PR?_SERY_ISR_?OS_CPU_A SEGMENT CODE
;//----------------------------------------------------------------
;//----------------------------------------------------------------
;//--------------------------------------------------------
EXTRN DATA (STKStart)
EXTRN DATA (OSIntNesting)
EXTRN DATA (User_SP)
EXTRN DATA (TickTimeInit)
;//--------------------------------------------------------
EXTRN IDATA (OSTCBCur)
EXTRN IDATA (OSTCBHighRdy)
EXTRN IDATA (OSRunning)
EXTRN IDATA (OSPrioCur)
EXTRN IDATA (OSPrioHighRdy)
;//--------------------------------------------------------
EXTRN CODE (OSTimeTick)
EXTRN CODE (OSTaskSwHook)
EXTRN CODE (OSIntExit)
EXTRN CODE (OSTCBSWHook)
EXTRN CODE (OSIntEnter)
EXTRN CODE (TickTime)
;//--------------------------------------------------------
EXTRN CODE (ExternInt0)
EXTRN CODE (ExternInt1)
EXTRN CODE (Time1Int)
EXTRN CODE (SeryInt)
;//--------------------------------------------------------
PUBLIC Extern_0_ISR
PUBLIC Extern_1_ISR
PUBLIC Time_1_ISR
PUBLIC Sery_ISR
;//--------------------------------------------------------
EXTRN CODE (OSTickISRHook)
;//--------------------------------------------------------
PUBLIC OSTickISR
PUBLIC OSIntCtxSw
PUBLIC OSCtxSw
PUBLIC OSStartHighRdy
;//--------------------------------------------------------
;//----------------------------------------------------------------
PushAll MACRO
USING 0
PUSH PSW
PUSH ACC
PUSH B
PUSH DPL
PUSH DPH
MOV A,R0
PUSH ACC
MOV A,R1
PUSH ACC
MOV A,R2
PUSH ACC
MOV A,R3
PUSH ACC
MOV A,R4
PUSH ACC
MOV A,R5
PUSH ACC
MOV A,R6
PUSH ACC
MOV A,R7
PUSH ACC
PUSH User_SP+1
PUSH User_SP
PUSH SP
ENDM
;//----------------------------------------------------------------
;//----------------------------------------------------------------
PopAll MACRO
POP ACC
POP User_SP ;// high byte
POP User_SP+1 ;// low byte
POP ACC
MOV R7,A
POP ACC
MOV R6,A
POP ACC
MOV R5,A
POP ACC
MOV R4,A
POP ACC
MOV R3,A
POP ACC
MOV R2,A
POP ACC
MOV R1,A
POP ACC
MOV R0,A
POP DPL
POP DPH
POP B
POP ACC
POP PSW
ENDM
;//----------------------------------------------------------------
RSEG ?PR?OSStartHighRdy?OS_CPU_A
OSStartHighRdy:
USING 0
CLR EA
LCALL OSTaskSwHook
MOV STKStart,SP
_OSStartHighRdyGet:
;//------------------------------------------
;// load the low byte of address of (name)
;// and load the TCB of OSTCBHighRdy to DPTR
MOV R0,#LOW (OSTCBCur)
INC R0
MOV DPH,@R0
INC R0
MOV DPL,@R0
;//------------------------------------------
;// get the STK of OSTCBCur task TCB
INC DPTR
MOVX A, @DPTR
MOV R1,A
INC DPTR
MOVX A, @DPTR
MOV R0,A
MOV DPH, R1
MOV DPL, R0
;//------------------------------------------
;// DPTR --> STK of task
INC DPTR
MOVX A, @DPTR
MOV R5,A
;//------------------------------------------
;// copy user to system
MOV R1, STKStart
DEC R1
MOV A, R5
MOV R4, A
COPY_STK:
INC DPTR
INC R1
MOVX A, @DPTR
MOV @R1, A
DJNZ R4, COPY_STK
;//------------------------------------------
;// OSRunning = 1; multitask start
MOV R0, #LOW(OSRunning)
MOV @R0,#01
;//------------------------------------------
;// Now R1 is the new task SP
MOV SP, R1
PopAll
SETB EA
RETI
;//----------------------------------------------------------------
;//----------------------------------------------------------------
RSEG ?PR?OSCtxSw?OS_CPU_A
OSCtxSw:
CLR EA
PushAll
OSCtxSw2:
;//------------------------------------------
;// SP - STKStart ===> R5
MOV A, SP
CLR C
SUBB A, STKStart
MOV R5,A
MOV R1,STKStart
MOV A, R5
ADD A, #01
MOV R5,A
;//------------------------------------------
MOV DPH, User_SP
MOV DPL, User_SP+1
;//------------------------------------------
;// DPTR - R5
MOV A, DPL ; Adjust the xstack pointer
CLR C
SUBB A, R5
MOV DPL,A
MOV A, DPH
SUBB A, #00H
MOV DPH,A
;//------------------------------------------
;// User_SP ===> DPTR
MOV User_SP, DPH
MOV User_SP+1, DPL
INC DPTR
;//------------------------------------------
;// Save the number of bytes saved
MOV A, R5
MOVX @DPTR,A
;//------------------------------------------
;// Save to user stk
MOV A, R5
MOV R4,A
DEC R1
SAVE_STK:
INC DPTR
INC R1
MOV A, @R1
MOVX @DPTR, A
DJNZ R4, SAVE_STK
;//------------------------------------------
MOV R0,#LOW(OSTCBCur)
INC R0
MOV DPH,@R0
INC R0
MOV DPL,@R0
INC DPTR
MOV A,User_SP
MOVX @DPTR,A
INC DPTR
MOV A,User_SP+1
MOVX @DPTR,A
;//------------------------------------------
LCALL OSTaskSwHook
LCALL OSTCBSWHook
LJMP _OSStartHighRdyGet
;//------------------------------------------
;//----------------------------------------------------------------
;//----------------------------------------------------------------
RSEG ?PR?OSIntCtxSw?OS_CPU_A
OSIntCtxSw:
;//------------------------------------------
;// Adjust the stack pointer to remove call to:
;// - call to OSIntExit (2 bytes)
;// - call to OSIntCtxSw (2 bytes)
;// - locals (0 bytes)
CLR EA
MOV A, SP
CLR C
SUBB A, #4
MOV SP,A
LJMP OSCtxSw2
;//----------------------------------------------------------------
;//----------------------------------------------------------------
CSEG AT 0000BH
LJMP OSTickISR
RSEG ?PR?OSTickISR?OS_CPU_A
OSTickISR:
USING 0
PushAll
CLR EA
CLR TR0
MOV TH0,#3CH
MOV TL0,#0B0H
SETB TR0
DJNZ TickTimeInit,OSTI_1
LCALL TickTime
LCALL OSTickISRHook
LCALL OSIntEnter
LCALL OSTimeTick
LCALL OSIntExit
OSTI_1:
PopAll
SETB EA
RETI
;//----------------------------------------------------------------
;//----------------------------------------------------------------
CSEG AT 00003H
LJMP Extern_0_ISR
RSEG ?PR?_EXTERN_0_ISR_?OS_CPU_A
Extern_0_ISR:
USING 0
CLR EA
PushAll
LCALL OSIntEnter
LCALL ExternInt0
PopAll
SETB EA
RETI
;//----------------------------------------------------------------
;//----------------------------------------------------------------
CSEG AT 00013H
LJMP Extern_1_ISR
RSEG ?PR?_EXTERN_1_ISR_?OS_CPU_A
Extern_1_ISR:
USING 0
CLR EA
PushAll
LCALL OSIntEnter
LCALL ExternInt1
LCALL OSIntExit
PopAll
SETB EA
RETI
;//----------------------------------------------------------------
;//----------------------------------------------------------------
CSEG AT 0001BH
LJMP Time_1_ISR
RSEG ?PR?_TIME_1_ISR_?OS_CPU_A
Time_1_ISR:
USING 0
CLR EA
PushAll
LCALL OSIntEnter
LCALL Time1Int
LCALL OSIntExit
PopAll
SETB EA
RETI
;//----------------------------------------------------------------
;//----------------------------------------------------------------
CSEG AT 00023H
LJMP Sery_ISR
RSEG ?PR?_SERY_ISR_?OS_CPU_A
Sery_ISR:
USING 0
CLR EA
PushAll
LCALL OSIntEnter
LCALL SeryInt
LCALL OSIntExit
PopAll
SETB EA
RETI
;//----------------------------------------------------------------
;//----------------------------------------------------------------
END
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