1 回答

TA貢獻(xiàn)1790條經(jīng)驗(yàn) 獲得超9個(gè)贊
通過單步調(diào)試,基本已經(jīng)能確定是死在下面這段匯編代碼里了,但是不知道為何,誰能解釋一下?
代碼:
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
; }
添加回答
舉報(bào)