?? conf_tny.a51
字號:
MOV A,saveacc
MOV PSW,savepsw
USING 0 ; Registerbank 0 for following code
IF (TIMESHARING == 0)
; Round Robin Task Switching not required. System Interrupt ends here
?RTX?SET_ISR:
IF (CPU_IDLE_CODE)
SETB ?RTX_ISR_SIG
ENDIF
RET
ENDIF
IF (TIMESHARING)
; Round Robin Task Switching required. Check if task generates timeout
; Check for Round Robin Timeout on the current task
JNB ?RTX_TS_DELAY,CheckRobinTime
NoRobinTimeout:
?RTX?SET_ISR:
IF (CPU_IDLE_CODE)
SETB ?RTX_ISR_SIG
ENDIF
RET
CheckRobinTime: DJNZ ?RTX_ROBINTIME,NoRobinTimeout
?RTX_TASKSWITCHING:
PUSH ACC
PUSH PSW
PUSH B
PUSH DPH
PUSH DPL
PUSH AR0
PUSH AR1
PUSH AR2
PUSH AR3
PUSH AR4
PUSH AR5
PUSH AR6
PUSH AR7
IF (CODE_BANKING <> 0)
PUSH ?B_CURRENTBANK
ENDIF
MOV A,?RTX_CURRENTTASK
RL A
ADD A,#?RTX?TASKSTATE?S+1
MOV R0,A
MOV A,#K_ROBIN
CLR EA
ORL A,@R0
MOV @R0,A
SETB EA
IF (CODE_BANKING <> 0)
SJMP os_switch_task1
ENDIF
ENDIF
;------------------------------------------------
; Perform a Task-Switch
; void os_switch_task (void)
; uchar i;
; uchar limit;
;---- Variable 'current' assigned to Register 'R6' ----
;---- Variable 'next' assigned to Register 'R7' ----
;---- Variable 'i' assigned to Register 'R0' ----
;---- Variable 'limit' assigned to Register 'R5' ----
;
;------------------------------------------------
os_switch_task:
IF (CODE_BANKING <> 0)
PUSH ?B_CURRENTBANK
ENDIF
os_switch_task1:
; next = current;
IF (TIMESHARING <> 0)
SETB ?RTX_TS_DELAY ; Delay Task Switching
ENDIF
MOV A,?RTX_CURRENTTASK
MOV R7,A
; while (1) {
RL A
ADD A,#?RTX?TASKSTATE?S+1
MOV R0,A
?C0001:
; if (++next == MAXTASKN+1) next = 0;
INC R7
INC R0
INC R0
IF (CPU_IDLE_CODE)
MOV A,R7
CJNE A,?RTX_CURRENTTASK,NoIDLE
JBC ?RTX_ISR_SIG,NoIDLE
CPU_IDLE ; CPU sleep
NoIDLE:
ENDIF
CJNE R7,#?RTX_MAXTASKN+1,?C0003
MOV R7,#0
MOV R0,#?RTX?TASKSTATE?S+1
?C0003:
; if (STATE[next].st & K_READY) break;
MOV A,@R0
JNB ACC.B_READY,?C0001
; }
;
PUBLIC ?RTX_NEXTID
PUBLIC ?RTX_NEXTTASK
?RTX_NEXTID EQU AR7
?RTX_NEXTTASK: NOP ; for Debugging
; while (current < next) {
?C0005:
MOV A,?RTX_CURRENTTASK
CLR C
SUBB A,R7
JNC ?C0011
; current++;
INC ?RTX_CURRENTTASK
; i = STKP[current];
MOV A,#?RTX?TASKSP?S
ADD A,?RTX_CURRENTTASK
MOV R0,A
MOV A,@R0
MOV R5,A
; STKP[current] = SP;
MOV @R0,SP
; if (current == MAXTASKN) limit = RAMTOP;
INC R0
MOV A,@R0
MOV R6,?RTX_CURRENTTASK
CJNE R6,#?RTX_MAXTASKN,?C0007
MOV A,#RAMTOP
?C0007:
XCH A,R5
MOV R0,A
; else limit = STKP[current+1];
;
; while (i != limit) {
?C0009:
MOV A,R0
XRL A,R5
JZ ?C0005
; SP++;
; i++;
; STACK[SP] = STACK[i];
INC R0
MOV A,@R0
PUSH ACC
SJMP ?C0009
; }
; }
?C0011:
;
; while (current > next) {
MOV A,?RTX_CURRENTTASK
SETB C
SUBB A,R7
JC ?C0012
MOV A,?RTX_CURRENTTASK
ADD A,#?RTX?TASKSP?S+1
MOV R0,A
MOV A,@R0
; if (current == (MAXTASKN)) i = RAMTOP;
; else i = STKP[current+1];
MOV R6,?RTX_CURRENTTASK
CJNE R6,#?RTX_MAXTASKN,?C0013
MOV A,#RAMTOP
?C0013:
MOV R5,A
; limit = STKP[current];
DEC R0
MOV A,@R0
XCH A,R5
MOV R0,A
;
; while (SP != limit) {
?C0015:
MOV A,SP
XRL A,R5
JZ ?C0016
; STACK[i] = STACK[SP];
; i--;
; SP--;
POP ACC
MOV @R0,A
DEC R0
SJMP ?C0015
?C0016:
; }
; STKP[current] = i;
MOV A,?RTX_CURRENTTASK
ADD A,#?RTX?TASKSP?S
XCH A,R0
MOV @R0,A
; current--;
DEC ?RTX_CURRENTTASK
SJMP ?C0011
?C0012:
; }
; RoundRobinTime = ?RTX_TIMESHARING
IF (TIMESHARING)
MOV ?RTX_ROBINTIME,#TIMESHARING
ENDIF
; if (STATE[current].st & K_ROBIN) goto RobinOn;
MOV A,?RTX_CURRENTTASK
RL A
ADD A,#?RTX?TASKSTATE?S+1
MOV R0,A
MOV R7,#SIG_EVENT
CLR EA
MOV A,@R0
IF (TIMESHARING)
JBC ACC.B_ROBIN,RobinOn
ENDIF
; if ((STATE[current].st & K_SIG) && (STATE[current].st & SIG_EVENT)
; goto SignalOn;
JNB ACC.B_WAITSIG,SignalOff
JBC ACC.B_SIGNAL,SignalOn
SignalOff:
; if ((STATE[current].st & K_TMO) && (STATE[current].st & TMO_EVENT)
; goto TimeOutOn;
MOV R7,#0 ; No Event
JNB ACC.B_WAITTIM,NoEvent
JNB ACC.B_TIMEOUT,NoEvent
TimeOutOn:
MOV R7,#TMO_EVENT
ANL A,#0F4H
SignalOn:
NoEvent: CLR ACC.B_RDY ; Clear RDY bit
XCH A,@R0
SETB EA
ANL A,#K_RDY
ORL AR7,A
IF (TIMESHARING <> 0)
IF (CODE_BANKING)
POP ACC
CALL ?B_RESTORE_BANK
ENDIF
CLR ?RTX_TS_DELAY
RET
ELSE
IF (CODE_BANKING)
POP ACC
JMP ?B_RESTORE_BANK
ENDIF
RET
ENDIF
;------------------------------------------------
IF (TIMESHARING <> 0)
RobinOn: MOV @R0,A
SETB EA
IF (CODE_BANKING)
POP ACC
CALL ?B_RESTORE_BANK
ENDIF
POP AR7
POP AR6
POP AR5
POP AR4
POP AR3
POP AR2
POP AR1
POP AR0
POP DPL
POP DPH
POP B
POP PSW
POP ACC
CLR ?RTX_TS_DELAY
RET ; Restart Task
ENDIF
; }
; }
;------------------------------------------------
; Start RTX-51 Tiny Kernel
;------------------------------------------------
EXTRN CODE (?C_STARTUP)
PUBLIC main
main: MOV R0,#?RTX?TASKSP?S
MOV @R0,SP
MOV A,#?RTX_MAXTASKN
JZ main2
MOV R7,A
main1: INC R0
MOV @R0,#RAMTOP
DJNZ R7,main1
main2: MOV R7,#?RTX_MAXTASKN+1
CLR A
MOV R0,#?RTX?TASKSTATE?S
main1x: MOV @R0,A
INC R0
MOV @R0,A
INC R0
DJNZ R7,main1x
MOV R0,#?RTX?TASKSTATE?S+1
MOV @R0,#K_ACTIVE+K_READY
MOV DPTR,#?RTX?TASKENT?S
MOV A,#1
MOVC A,@A+DPTR
PUSH ACC
CLR A
MOVC A,@A+DPTR
PUSH ACC
IF (TIMESHARING <> 0)
MOV ?RTX_ROBINTIME,#TIMESHARING
ENDIF
ORL TMOD,#01H ; Timer 0 Mode 1
MOV TL0,#LOW (?RTX_CLOCK)
MOV TH0,#HIGH (?RTX_CLOCK)
SETB TR0
SETB EA
SETB ET0
RET ; Start Task 0
;------------------------------------------------
PUBLIC ?RTX_TASKIDX
?RTX_TASKIDX: DB ?RTX_MAXTASKN ; for Debugging
END
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