請問8051七段顯示器程式修改

Question

想請問各位大大修改程式的問題,我想把程式修改成顯示0~9 再從9~0 回來 不過不清楚修改的重點在哪 請問為大大幫忙解釋一下 程式如下:

;file name = 7seg.asm for port 1 flash (program 03-2)

;****************************************************************

ORG 0H ;reset start here

START: ;

MOV R2,#0 ;set 7-seg code index

MOV DPTR,#TABLE ;load table address

LOOP1: MOV A,R2 ;load A with index number

MOVC A,@A+DPTR ;translate number into 7seg code

MOV P1,A ;output 7seg code to port1

CALL DELAY ;delay some time for look slowly

CALL DELAY ;delay

INC R2 ;increase index number

CJNE R2,#10,LOOP1 ;if index not equal 10,jmp next

JMP START ;restart

DELAY: MOV R7,#0 ;delay parameter

$1: MOV R6,#0 ;

DJNZ R6,$ ;

DJNZ R7,$1 ;

RET ;

; 7 segment led display code [pabcdefg] for 0--9

TABLE DB 10000001B ;0's 7seg code

DB 11001111B ;1's 7seg code

DB 10010010B ;2's 7seg code

DB 10000110B ;3's 7seg code

DB 11001100B ;4's 7seg code

DB 10100100B ;5's 7seg code

DB 10100000B ;6's 7seg code

DB 10001111B ;7's 7seg code

DB 10000000B ;8's 7seg code

DB 10000100B ;9's 7seg code

END

這個程式是顯示0~9 就停止ㄌ 要從0~9~0 跑回來請問要怎麼修改! 感恩 幫忙解決一下一問 謝謝!

Answer 1

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最簡單的方法

程式大體不變

如下

;file name = 7seg.asm for port 1 flash (program 03-2)

;****************************************************************

ORG 0H ;reset start here

START: ;

MOV R2,#0 ;set 7-seg code index

MOV DPTR,#TABLE ;load table address

LOOP1: MOV A,R2 ;load A with index number

MOVC A,@A+DPTR ;translate number into 7seg code

MOV P1,A ;output 7seg code to port1

CALL DELAY ;delay some time for look slowly

CALL DELAY ;delay

INC R2 ;increase index number

CJNE R2,#20,LOOP1 ;if index not equal 10,jmp next

JMP START ;restart

DELAY: MOV R7,#0 ;delay parameter

$1: MOV R6,#0 ;

DJNZ R6,$ ;

DJNZ R7,$1 ;

RET ;

; 7 segment led display code [pabcdefg] for 0--9

TABLE DB 10000001B ;0's 7seg code

DB 11001111B ;1's 7seg code

DB 10010010B ;2's 7seg code

DB 10000110B ;3's 7seg code

DB 11001100B ;4's 7seg code

DB 10100100B ;5's 7seg code

DB 10100000B ;6's 7seg code

DB 10001111B ;7's 7seg code

DB 10000000B ;8's 7seg code

DB 10000100B ;9's 7seg code

DB 10000100B ;9's 7seg code

DB 10000000B ;8's 7seg code

DB 10001111B ;7's 7seg code

DB 10100000B ;6's 7seg code

DB 10100100B ;5's 7seg code

DB 11001100B ;4's 7seg code

DB 10000110B ;3's 7seg code

DB 10010010B ;2's 7seg code

DB 11001111B ;1's 7seg code

END

2009-06-11 11:53:54 補充：

此行改成#20喔

CJNE R2,#20,LOOP1 ;if index not equal 10,jmp next

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