程序流程图

代码

#include<reg52.h>

#define uchar unsigned char

sbit dula=P2^6;

sbit wela=P2^7;

sbit jia_key=P3^6;

sbit jian_key=P3^7;

sbit zf_key=P3^5;

bit flag=0;

uchar num = 0,show_num=2,maichong=4,table_begin=0;

uchar code table1[]={0x01,0x02,0x04,0x08,0x08,0x04,0x02,0x01};

uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void delay(uchar i)

{

uchar j,k;

for(j=i;j>0;j--)

for(k=125;k>0;k--);

}

void display()

{

dula=0;

P0=table[show_num];

dula=1;

dula=0;

wela=0;

P0=0xfe;

wela=1;

wela=0;

delay(5);

P0=table[0];

dula=1;

dula=0;

P0=0xfd;

wela=1;

wela=0;

delay(5);

}

void key()

{

if(jia_key==0)

{

delay(5);

if(jia_key==0)

{

num++;

if(num==4)

num=3;

while(jia_key==0);

}

}

if(jian_key==0)

{

delay(5);

if(jian_key==0)

{

if(num!=0)

num--;

else

num=0;

while(jian_key==0);

}

}

if(zf_key==0)

{

delay(5);

if(zf_key==0)

{

flag=~flag;

while(zf_key==0);

}

}

}

void dispose()

{

switch(num)

{

case 0:

show_num=2;

maichong=5;

break;

case 1:

show_num=4;

maichong=4;

break;

case 2:

show_num=6;

maichong=6;

break;

case 3:

show_num=8;

maichong=2;

break;

}

if(flag==0)

{

table_begin=0;

}

else

table_begin=4;

}

void qudong()

{

uchar i,j;

for(j=0+table_begin;j<4+table_begin;j++)

{

P1=table1[j];

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

{

display();

}

}

}

void main()

{

while(1)

{

key();

dispose();

qudong();

}

}

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