单片机抢答器设计
;=====正常抢答处理程序=====
TRUE1: ACALL BARK ;按键发声
MOV A,R2
MOV R6,A ;抢答时间R2送R6
MOV R3,#01H
CLR OK ;因为答题的计时不再查询抢答,所以就锁了抢答
AJMP COUNT
TRUE2: ACALL BARK;
MOV A,R2
MOV R6,A
MOV R3,#02H
CLR OK
AJMP COUNT
TRUE3: ACALL BARK;
MOV A,R2
MOV R6,A
MOV R3,#03H
CLR OK
AJMP COUNT
TRUE4: ACALL BARK;
MOV A,R2
MOV R6,A
MOV R3,#04H
CLR OK
AJMP COUNT
TRUE5: ACALL BARK;
MOV A,R2
MOV R6,A
MOV R3,#05H
CLR OK
AJMP COUNT
TRUE6: ACALL BARK;
MOV A,R2
MOV R6,A
MOV R3,#06H
CLR OK
AJMP COUNT
;=====犯规抢答程序=====
ERROR: MOV R0,#00H
MOV TH1,#3CH
MOV TL1,#0B0H
MOV 34H,R3 ;犯规号数暂存与(34H)
HERE: MOV A,R0
CJNE A,#0AH,FLASH ;0.5s向下运行->灭并停响
CLR RING
MOV R3,#0AH
MOV R4,#0AH
MOV R5,#0AH ;三灯全灭
AJMP CHECK1
FLASH: CJNE A,#14H,CHECK1 ;下面系1s的情况,响并显示号数并清R0,重新计
SETB RING
MOV R0,#00H
MOV R3,34H ;取回号数
MOV R5,#0BH
MOV R4,#0BH ;显示FF和号数
AJMP CHECK1
CHECK1:JNB P1.7,QUIT1
ACALL DISPLAY
AJMP HERE
QUIT1: CLR RING
CLR OK
AJMP START
;=====单片机抢答器显示程序=====
DISPLAY:
MOV DPTR,#DAT1 ;查表显示程序,利用P0口做段选码口输出/P2低三位做位选码输出,
MOV A,R5
MOVC A,@A+DPTR
MOV P2,#01H
MOV P0,A
ACALL DELAY
MOV DPTR,#DAT2
MOV A,R4
MOVC A,@A+DPTR
MOV P2,#02H
MOV P0,A
ACALL DELAY
MOV A,R3
MOVC A,@A+DPTR
MOV P2,#04H
MOV P0,A
ACALL DELAY
RET
DAT1:DB 00H,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fh,00H,71H
;"灭","1","2","3","4","5","6","7","8","9","灭","F"
DAT2:DB 3fh,06h,5bh,4fh,66h,6dh,7dh,07h,7fh,6fh,00H,71H
;第一个为零,其他与上相同,因为十位如果为零显示熄灭
;====加减时间延时(起到不会按下就加N个数)======
DELAY1: MOV 35H,#08H
LOOP0: ACALL DISPLAY
DJNZ 35H,LOOP0
RET
;=====延时(显示和去抖动用到)=====
DELAY: MOV 32H,#12H
LOOP: MOV 33H,#0AFH
LOOP1: DJNZ 33H,LOOP1
DJNZ 32H,LOOP
RET
;=====发声程序=====
BARK: SETB RING
ACALL DELAY1
ACALL DELAY1
CLR RING ;按键发声
RET
;=====TO溢出中断(响铃程序)=====
T0INT: MOV TH0,#0ECH
MOV TL0,#0FFH
JNB RING,OUT;
CPL P3.6 ;RING标志位为1时候P3.6口不短取反使喇叭发出一定频率的声音
OUT: RETI
;=====T1溢出中断(计时程序)=====
T1INT: MOV TH1,#3CH
MOV TL1,#0B0H
INC R0
RETI
END
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