ORG 0000H
AJMP MAIN
ORG 0003H
AJMP INT0SUB
ORG 000BH
AJMP T0INT
ORG 001BH
AJMP T1INT
OK EQU 20H ; 抢答开始标志位
RING EQU 22H ; 响铃标志位
ORG 0040H
MAIN: MOV R1,#0FH; 初设抢答时间为15s
MOV R2,#0AH; 初设答题时间为10s
MOV TMOD,#11H; 设置未定时器/模式1
MOV TH0,#0F0H
MOV TL0,#0FFH; 越高发声频率越高,越尖
MOV TH1,#3CH
MOV TL1,#0B0H; 50ms为一次溢出中断
SETB EA
SETB ET0
SETB ET1
SETB EX0
SETB EX1; 允许四个中断,T0/T1/INT0/INT1
CLR OK
CLR RING
SETB TR1
SETB TR0; 一开始就运行定时器,以开始显示FFF.如果想重新计数,重置TH1/TL1就可以了
//查询程序:
START: MOV R5,#0BH
MOV R4,#0BH
MOV R3,#0BH
ACALL DISPLAY; 未开始抢答时候显示FFF
JB P3.0,NEXT
ACALL DELAY
JB P3.0,NEXT;去抖动,如果"开始键"按下就向下执行,否者跳到非法抢答查询
ACALL BARK;按键发声
MOV A,R1
MOV R6,A; 送R1->R6,因为R1中保存了抢答时间
SETB OK; 抢答标志位,用于COUNT只程序中判断是否查询抢答
MOV R3,#0AH; 抢答只显示计时,灭号数
AJMP COUNT;进入倒计时程序,"查询有效抢答的程序"在COUNT里面
NEXT: JNB P1.0,FALSE1
JNB P1.1,FALSE2
JNB P1.2,FALSE3
JNB P1.3,FALSE4
JNB P1.4,FALSE5
JNB P1.5,FALSE6
JNB P1.6,FALSE7
JNB P1.7,FALSE8
AJMP START
//非法抢答处理程序:
FALSE1: ACALL BARK; 按键发声
MOV R3,#01H
AJMP ERROR
FALSE2: ACALL BARK
MOV R3,#02H
AJMP ERROR
FALSE3: ACALL BARK
MOV R3,#03H
AJMP ERROR
FALSE4: ACALL BARK
MOV R3,#04H
AJMP ERROR
FALSE5: ACALL BARK
MOV R3,#05H
AJMP ERROR
FALSE6: ACALL BARK
MOV R3,#06H
AJMP ERROR
FALSE7: ACALL BARK
MOV R3,#07H
AJMP ERROR
FALSE8: ACALL BARK
MOV R3,#08H
AJMP ERROR
//倒计时程序(包括有效抢答程序):
COUNT: MOV R0,#00H; 重置定时器中断次数
MOV TH1,#3CH
MOV TL1,#0B0H; 重置定时器
RECOUNT: MOV A,R6; R6保存了倒计时的时间
MOV B,#0AH
DIV AB; 除十分出个位/十位
MOV 30H,A; 十位存于(30H)
MOV 31H,B; 个位存于(31H)
MOV R5,30H ; 取十位
MOV R4,31H ; 取个位
MOV A,R6
CLR C
SUBB A,#07H
JNC LARGER ;大于5s跳到LARGER,小于等于5s会提醒
MOV A,R0
CJNE A,#0AH,FULL;1s中0.5s向下运行
CLR RING
AJMP CHECK
FULL: CJNE A,#14H,CHECK ; 1s时,响并显示号数并清R0,重新计时
SETB RING
MOV A,R6
JZ QUIT ; 计时完毕
MOV R0,#00H
DEC R6 ; 一秒标志减1
AJMP CHECK
LARGER: MOV A,R0
CJNE A,#14H,CHECK ; 如果1s向下运行,否者跳到查"停/显示"
DEC R6; 计时一秒R6自动减1
MOV R0,#00H
CHECK: JNB P3.1,QUIT; 如按下停止键退出
ACALL DISPLAY
JNB P1.0,TRUE1
JNB P1.1,TRUE2
JNB P1.2,TRUE3
JNB P1.3,TRUE4
JNB P1.4,TRUE5
JNB P1.5,TRUE6
JNB P1.6,TRUE7
JNB P1.7,TRUE8
AJMP RECOUNT
QUIT: CLR OK ; 如果按下了"停止键"重新回到开始
CLR RING
ACALL BARK
AJMP START
//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;
AJMP LOOP2
TRUE2:ACALL BARK;
MOV A,R2
MOV R6,A
MOV R3,#02H
CLR OK
AJMP LOOP2
TRUE3:ACALL BARK;
MOV A,R2
MOV R6,A
MOV R3,#03H
CLR OK
AJMP LOOP2
TRUE4:ACALL BARK;
MOV A,R2
MOV R6,A
MOV R3,#04H
CLR OK
AJMP LOOP2
TRUE5: ACALL BARK;
MOV A,R2
MOV R6,A
MOV R3,#05H
CLR OK
AJMP LOOP2
TRUE6: ACALL BARK;
MOV A,R2
MOV R6,A
MOV R3,#06H
CLR OK
AJMP LOOP2
TRUE7: ACALL BARK;
MOV A,R2
MOV R6,A
MOV R3,#07H
CLR OK
AJMP LOOP2
TRUE8: ACALL BARK;
MOV A,R2
MOV R6,A
MOV R3,#08H
CLR OK
AJMP LOOP2
LOOP2: AJMP DISPLAY ;抢答后停止计时，等待返回
SETB RING
JNB P3.1 , QUIT
AJMP LOOP2
//犯规抢答程序:
ERROR: SETB RING ;犯规响铃
MOV R5,#0BH
MOV R4,#0BH; 显示FF和犯规号数
LOOP3: ACALL DISPLAY
JNB P3.1 , QUIT1; 等待"停止"键按下
AJMP LOOP3
QUIT1: CLR RING
CLR OK
AJMP START
//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
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
ACALL DELAY1
ACALL DELAY1
CLR RING; 按键发声
RET
//INT0(抢答时间R1调整程序):
INT0SUB:MOV A,R1
MOV B,#0AH
DIV AB
MOV R5,A
MOV R4,B
MOV R3,#0AH
ACALL DISPLAY;先在两个时间LED上显示R1
JNB P3.2,INC0; P3.2为+1s键,如按下跳到INCO
JNB P3.3,DEC0; P3.3为-1s键,如按下跳到DECO
JNB P3.4,BACK0; P3.4为确定键,如按下跳到BACKO
AJMP INT0SUB
INC0: MOV A,R1
CJNE A,#63H,ADD0; 如果不是99,R2加1,如果加到99了,R1就置0，重新加起
MOV R1,#00H
ACALL DELAY1
AJMP INT0SUB
ADD0: INC R1
ACALL DELAY1
AJMP INT0SUB
DEC0: MOV A,R1
JZ SETR1;如果R1为0, R1就置99，
DEC R1
ACALL DELAY1
AJMP INT0SUB
SETR1: MOV R1,#63H
ACALL DELAY1
AJMP INT0SUB
BACK0: RETI
//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
