单片机实验 八段数码管显示 c语言 汇编

八段数码管显示汇编

OUTBIT equ 08002h ; 位控制口

OUTSEG equ 08004h ; 段控制口

LEDBuf equ 60h ; 显示缓冲

Num equ 70h ; 显示的数据

DelayT equ 75h ;

ljmp Start

LEDMAP: ; 八段管显示码

db 3fh, 06h, 5bh, 4fh, 66h, 6dh, 7dh, 07h

db 7fh, 6fh, 77h, 7ch, 39h, 5eh, 79h, 71h

Delay: ;

mov r7, #0

DelayLoop:

djnz r7, DelayLoop

djnz r6, DelayLoop

ret

DisplayLED:

mov r0, #LEDBuf

mov r1, #6 ;

mov r2, #00100000b ;

Loop:

mov dptr, #OUTBIT

mov a, #0

movx @dptr, a ;

mov a, @r0

mov dptr, #OUTSEG

movx @dptr,a

mov dptr, #OUTBIT

mov a, r2

movx @dptr, a ;

mov r6, #01

call Delay

mov a, r2 ;

rr a

mov r2, a

inc r0

djnz r1, Loop

mov dptr, #OUTBIT

mov a, #0

movx @dptr, a ;

ret

Start:

mov sp, #40h

mov Num, #0

MLoop:

mov Num, #0

inc Num

mov a, Num

mov b, a

mov r0, #LEDBuf FillBuf:

mov a, b

anl a, #0fh

mov dptr, #LEDMap

movc a, @a+dptr ;

mov @r0,a ;

inc r0

inc b

cjne r0, #LEDBuf+6, FillBuf

mov DelayT,#0 DispAgain:

call DisplayLED ;

djnz DelayT,DispAgain

ljmp MLoop

end

c语言

#include

#define LEDLen 6

xdata unsigned char OUTBIT _at_ 0x8002; // 位控制口xdata unsigned char OUTSEG _at_ 0x8004; // 段控制口

unsigned char LEDBuf[LEDLen]; // 显示缓冲code unsigned char LEDMAP[] = { // 八段管显示码0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d

};

void Delay(unsigned char CNT)

{ unsigned char i;

while (CNT-- !=0)

for (i=100; i !=0; i--);

}

void DisplayLED()

{ unsigned char i;

unsigned char Pos;

unsigned char LED;

Pos = 0x20; // 从左边开始显示

for (i = 0; i < LEDLen; i++)

{ OUTBIT = 0; // 关所有八段管LED = LEDBuf[i];

OUTSEG = LED;

OUTBIT = Pos; // 显示一位八段管

Delay(1);

Pos >>= 1; // 显示下一位}

OUTBIT = 0; // 关所有八段管

}

void main()

{ unsigned char i = 0;

unsigned char j;

while(1)

{ LEDBuf[0] = LEDMAP[i%6];

LEDBuf[1] = LEDMAP[(i+1)%6];

LEDBuf[2] = LEDMAP[(i+2)%6];

LEDBuf[3] = LEDMAP[(i+3)%6];

LEDBuf[4] = LEDMAP[(i+4)%6];

LEDBuf[5] = LEDMAP[(i+5)%6];

i++;

for(j=0; j<100; j++)

DisplayLED(); // 显示}

}