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標(biāo)題: 51單片機(jī)匯編語(yǔ)言八路搶答器數(shù)組越界問(wèn)題 [打印本頁(yè)]

作者: 青銅左腳 時(shí)間: 2026-7-7 22:01
標(biāo)題: 51單片機(jī)匯編語(yǔ)言八路搶答器數(shù)組越界問(wèn)題
目的：使用51單片機(jī)P0口驅(qū)動(dòng)共陽(yáng)數(shù)碼管實(shí)現(xiàn)8路搶答器，上電默認(rèn)顯示0，然后1-8按鍵被按下就顯示該數(shù)值，且后續(xù)任何按鍵按下無(wú)效，按復(fù)位鍵從來(lái)。問(wèn)題：代碼1剛上電，數(shù)碼管無(wú)任何顯示！！！；1-8按鍵功能正常。
問(wèn)題分析：通過(guò)KEIL調(diào)試發(fā)現(xiàn)初始化A=00，1：LOOP行完后A是0XC0，P0是0XC0（顯示數(shù)字0）；2：第一輪結(jié)束然后跳轉(zhuǎn)到LOOP執(zhí)行完后A變成0X00(TABLE【192的偏移地址是多少？越界了所以是0X00】)，P0又變?yōu)?0（顯示數(shù)字0.），然后程序不斷循環(huán)1、2
解決方案：讓循環(huán)發(fā)生在P0賦值0之后、或者每次循環(huán)都重新賦值P0為0，代碼B就是讓循環(huán)發(fā)生在P0賦值之后，這樣P0端口在沒有按鍵按下的時(shí)間都是固定值（循環(huán)前被賦值MOV P0,A）
代碼A：
KEY2 BIT P2.1
KEY3 BIT P2.2
KEY4 BIT P2.3

KEY5 BIT P2.4
KEY6 BIT P2.5
KEY7 BIT P2.6
KEY8 BIT P2.7

ORG 00H
MAIN:
   MOV A,#00
   MOV DPTR,#TABLE
LOOP:
      MOVC A,@A+DPTR
   MOV P0,A

KEYA:JB KEY1,KEYB
      MOV A,#1
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYB:JB KEY2,KEYC
      MOV A,#2
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYC:JB KEY3,KEYD
   MOV A,#3
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYD:JB KEY4,KEYE
   MOV A,#4
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYE:JB KEY5,KEYF
   MOV A,#5
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYF:JB KEY6,KEYG
      MOV A,#6
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYG:JB KEY7,KEYH
      MOV A,#7
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYH:JB KEY8,LOOP
      MOV A,#8
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $


TABLE:DB 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8
   DB 0x80,0x90,0x88,0x83,0xC6,0xa1,0x86,0x8e
      END
/***********************/
代碼B：
KEY2 BIT P2.1
KEY3 BIT P2.2
KEY4 BIT P2.3

KEY5 BIT P2.4
KEY6 BIT P2.5
KEY7 BIT P2.6
KEY8 BIT P2.7

ORG 00H
MAIN:
   MOV A,#00
   MOV DPTR,#TABLE
LOOP:
      MOVC A,@A+DPTR
   MOV P0,A

KEYA:JB KEY1,KEYB
      MOV A,#1
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYB:JB KEY2,KEYC
      MOV A,#2
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYC:JB KEY3,KEYD
   MOV A,#3
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYD:JB KEY4,KEYE
   MOV A,#4
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYE:JB KEY5,KEYF
   MOV A,#5
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYF:JB KEY6,KEYG
      MOV A,#6
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYG:JB KEY7,KEYH
      MOV A,#7
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

KEYH:JB KEY8,KEYA
      MOV A,#8
      MOVC A,@A+DPTR
   MOV P0,A
      JMP $

TABLE:DB 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8
   DB 0x80,0x90,0x88,0x83,0xC6,0xa1,0x86,0x8e
      END

作者: 188610329 時(shí)間: 2026-7-8 22:37
匯編的目的，就是程序簡(jiǎn)單化，沒必要，把簡(jiǎn)單的應(yīng)用，搞到復(fù)雜化吧？

你的按鍵都在 P2, 數(shù)碼管在 P0, 這么寫不是更簡(jiǎn)單？

Start:
MOV P0,#0C0H
MOV DPTR,#TABLE
CLR A
MOV R2,A
Check_key:
CPL A
XOR A,P2
JZ Check_key
Key_Analysis:
RRC A
INC R2
JNC Key_Analysis
Key_Disp:
MOV A,R2
MOVC A,@A+DPTR
MOV P0,A
SJMP $

TABLE:DB 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8
DB 0x80,0x90,0x88,0x83,0xC6,0xa1,0x86,0x8e
END

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