KEYBUF EQU 40H ;键号存放单元
ORG 0000H
LJMP MAIN
ORG 0030H
MAIN: MOV KEYBUF,#0 ;初始键号设位0，也可以为任意值
;===============================================
;键盘扫描子程序
WAIT: MOV P1,#0FFH ;P1口送高电平
CLR P1.0 ;第一行清零
MOV A,P1 ;读P1口
ANL A,#0F0H ;低位屏蔽
XRL A,#0F0H ;判断低位是否有低电平 ,即判断是否有按键按下
JZ NOKEY1 ;地位有低电平继续扫描,否者跳到第而行去扫描
LCALL DELY10ms ;延时10ms去抖在进行判断是否有按键按下
MOV A,P1 ;继续读P1口
ANL A,#0F0H ;判断低位是否有低电平
CJNE A,#0E0H,NK1 ;如果扫描数据不为0E0H就转到NK1
MOV KEYBUF,#0 ;否者判断为0号键
AJMP DK ;转DK1查表程序
NK1: CJNE A,#0D0H,NK2 ;如果扫描数据不为0D0H就转到NK2
MOV KEYBUF,#1 ;否者判断为1号键
AJMP DK ;转DK2查表程序
NK2: CJNE A,#0B0H,NK3 ;如果扫描数据不为0B0H就转到NK3
MOV KEYBUF,#2 ;否者判断为2号键
AJMP DK ;转DK3查表程序
NK3: CJNE A,#70H,NK4 ;如果扫描数据不为70H就转到NK4
AJMP QI_OR_TING
NK4: NOP
NOKEY1: MOV P1,#0FFH ;和上面相同
CLR P1.1
MOV A,P1
ANL A,#0F0H
XRL A,#0F0H
JZ NOKEY2
LCALL DELY10MS
MOV A,p1
ANL A,#0F0H
XRL A,#0F0H
JZ NOKEY2
MOV A,P1
ANL A,#0F0H
CJNE A,#0E0H,NK5
MOV KEYBUF,#3
AJMP DK
NK5: CJNE A,#0D0H,NK6
MOV KEYBUF,#4
AJMP DK
NK6: CJNE A,#0B0H,NK7
MOV KEYBUF,#5
AJMP DK
NK7: CJNE A,#70H,NK8
MOV KEYBUF,#10 ;否者判断为3号键
AJMP DK ;转DK4查表程序
NK8: NOP
NOKEY2: MOV P1,#0FFH
CLR P1.2
MOV A,P1
ANL A,#0F0H
XRL A,#0F0H
JZ NOKEY3
LCALL DELY10MS
MOV A,P1
ANL A,#0F0H
XRL A,#0F0H
JZ NOKEY3
MOV A,P1
ANL A,#0F0H
CJNE A,#0E0H,NK9
MOV KEYBUF,#6
AJMP DK
NK9: CJNE A,#0D0H,NK10
MOV KEYBUF,#7
AJMP DK
NK10: CJNE A,#0B0H,NK11
MOV KEYBUF,#8
AJMP DK
NK11: CJNE A,#70H,NK12
AJMP SHE_DING
NK12: NOP
NOKEY3: MOV P1,#0FFH
CLR P1.3
MOV A,P1
ANL A,#0F0H
XRL A,#0F0H
JZ NOKEY4
LCALL DELY10MS
MOV A,P1
ANL A,#0F0H
XRL A,#0F0H
JZ NOKEY4
MOV A,P1
ANL A,#0F0H
CJNE A,#0E0H,NK13
AJMP JIA_SU
NK13: CJNE A,#0D0H,NK14
AJMP JIAN_SU
NK14: CJNE A,#0B0H,NK15
AJMP ZHENG_OR_FAN
NK15: CJNE A,#70H,NK16
AJMP QING_CHU
NK16: NOP
;=======================================================
;查表求键值程序
DK: MOV B,#00H
MOV A,KEYBUF ;查表程序 查对应的键号数据
MOV DPTR,#TABLE ;把表头地址放入DPTR
MOVC A,@A+DPTR ;A里面存放的为键号,利用A和表头地址找到对应的键号数据
MOV B,A ;把查到的数据送往显示单元
INC R1 ;取下一个显示单元
MOV A,R1
CJNE A,#36H,DKA1 ;判断显示单元是否已满
MOV R1,#35H ;35H,36H单元用于更好的控制五位显示
AJMP DKA
DKA1: MOV 34H,33H ;按键代码按左移显示，先按先显示
MOV 33H,32H
MOV 32H,31H
MOV 31H,30H
MOV 30H,B
DKA: MOV A,P1 ;读P1口
ANL A,#0F0H ;屏蔽高四位
XRL A,#0F0H ;地位是有低电平
JNZ DKA ;如果有低电平继续读P1口,否者向下执行,查找第二行
NOKEY4: LJMP DIS1
;===================================
;功能按键功能设定
QI_OR_TING:?????
SHE_DING:?????
JIA_SU:?????
JIAN_SU:?????
ZHENG_OR_FAN:?????
QING_CHU:?????
;=============================================
;延时程序和查表表格
DELY10ms:MOV R6,#20 ;延时10毫秒
D2: MOV R7,#1248
DJNZ R7,$
DJNZ R6,D2
RET
TABLE: DB 07H, 04H, 01H ;启/停 本表格是以键盘为参考 7 8 9 加速
DB 08H, 05H, 02H，00H ; 4 5 6 减速
DB 09H, 06H, 03H ;设定 1 2 3 正反转
DB;加速 减速 正反转 清除 启/停 0 设定 清除
END
