矩阵键盘的按键值显示到1602液晶上用汇编语言编写
时间: 2024-03-24 12:41:00 浏览: 235
好的,下面是一个简单的汇编语言程序,可以读取4x4矩阵键盘的按键值,并将其显示在LCD1602上。
```
.MODEL SMALL
.STACK 100H
.DATA
KEYPAD PORTB
LCD PORTC
.CODE
MAIN PROC
MOV AX, @DATA
MOV DS, AX
MOV AL, 11110000B
OUT KEYPAD, AL
MOV AL, 00111100B
CALL SEND_COMMAND
MOV AL, 00001111B
OUT KEYPAD, AL
MOV AL, 00001100B
CALL SEND_COMMAND
READ_KEY:
CALL DELAY
CALL READ_KEYPAD
CMP AL, 0FFH
JE READ_KEY
MOV AH, AL
MOV AL, AH
CALL SEND_COMMAND
MOV AL, AH
AND AL, 0FH
ADD AL, 30H
CALL SEND_DATA
JMP READ_KEY
SEND_COMMAND PROC
MOV BL, AL
MOV AL, AL AND 0F0H
OUT LCD, AL
CALL DELAY
MOV AL, BL
AND AL, 00001111B
SHL AL, 4
OUT LCD, AL
CALL DELAY
RET
SEND_COMMAND ENDP
SEND_DATA PROC
MOV BL, AL
MOV AL, AL AND 0F0H
OR AL, 00000001B
OUT LCD, AL
CALL DELAY
MOV AL, BL
AND AL, 00001111B
SHL AL, 4
OR AL, 00000001B
OUT LCD, AL
CALL DELAY
RET
SEND_DATA ENDP
READ_KEYPAD PROC
MOV AL, 0FFH
OUT KEYPAD, AL
IN AL, KEYPAD
MOV BL, AL
MOV AL, 11110000B
OUT KEYPAD, AL
MOV AL, 0F0H
AND AL, BL
SHR AL, 4
CMP AL, 0FH
JBE ROW1
MOV AL, 0FFH
JMP FINISH
ROW1:
MOV AL, 0EFH
AND AL, BL
SHR AL, 0
CMP AL, 0BH
JBE ROW2
MOV AL, 0FFH
JMP FINISH
ROW2:
MOV AL, 0DFH
AND AL, BL
SHR AL, 4
CMP AL, 07H
JBE ROW3
MOV AL, 0FFH
JMP FINISH
ROW3:
MOV AL, 0BFH
AND AL, BL
SHR AL, 0
CMP AL, 03H
JBE ROW4
MOV AL, 0FFH
JMP FINISH
ROW4:
MOV AL, 07H
AND AL, BL
SHR AL, 4
FINISH:
RET
READ_KEYPAD ENDP
DELAY PROC
MOV CX, 0FFFFH
D1: DEC CX
JNE D1
RET
DELAY ENDP
MAIN ENDP
END MAIN
```
在这个程序中,读取4x4矩阵键盘的代码在READ_KEYPAD过程中实现,使用SEND_COMMAND和SEND_DATA过程来向LCD1602发送命令和数据。程序将通过DELAY过程来实现简单的延迟,以确保LCD1602有足够的时间来响应命令和数据。
请注意,这只是一个基本的示例程序,并且可能需要根据你的硬件配置进行修改。如果你遇到任何问题,请随时问我。
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