单片机源程序如下:

#include

#include

#define uchar unsigned char

#define uint unsigned int

sbit cs=P1^2;

sbit clk=P1^0;

sbit di=P1^1;

uchar num,num1,i,a,b,c,e,f,g;

int wendu;

sbit we = P2^7; //位定义数码管位选锁存器接口

sbit du = P2^6; //位定义数码管段选锁存器接口

sbit pay_plus=P1^4;

sbit pay_minus=P1^3;

sbit confirm=P1^5;

sbit LED=P1^6;

int TimerCount=0,time_count=0;

int L_set_wendu=0;

int H_set_wendu=20;

bit confirm_scan=1;

bit pay_plus_scan=1;

bit pay_minus_scan=1;

//数码管段选表

uchar code leddata[]={

0x3F, //"0"

0x06, //"1"

0x5B, //"2"

0x4F, //"3"

0x66, //"4"

0x6D, //"5"

0x7D, //"6"

0x07, //"7"

0x7F, //"8"

0x6F, //"9"

0x40, //"-"

0x00, //熄灭

0x00 //自定义

};

void delay(unsigned long x)

{

uchar y;

for(;x>0;x--)

for(y=110;y>0;y--);

}

uchar ADC0832()

{

cs=1;

clk=0;

cs=0;

di=1;

clk=1;

clk=0;

di=1;

clk=1;

clk=0;

di=0;

clk=1;

clk=0;

di=1;

for(i=0;i<8;i++)

{

clk=1;

clk=0;

num=num<<1;

num|=(uchar)di;

}

cs=1;

return num;

}

int SG=0;

void Key()

{

if(confirm!=confirm_scan)

{

if(confirm==0) //下降沿

{ SG++;

// step++;

if(SG>=3)

SG=0;

}

confirm_scan=confirm;

}

}

void Timer0_Init(void)

{

TMOD |= 0x01;

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

EA = 1;

ET0 = 1;

TR0 = 1;

}

void main()

{

pay_plus=1;

pay_minus=1;

confirm=1;

Timer0_Init();

while(1)

{Key();

ADC0832();

if(num<=38)

wendu=num-69;

if(num>38&&num<=70)

wendu=num-70;

if(num>70)

wendu=num-71;

if(SG==0)

{

if(wendu>=0)

{

a=wendu/100;

b=wendu%100/10;

c=wendu%10;

if(a>0)

{

P0 = 0xfd;//1111 1101 只选通第二位数码管

we = 1; //打开位选

we = 0; //关闭位选

P0 = leddata[a]; //显示2

du = 1;//打开段选

du = 0; //关闭段选

delay(2);//延时

}

if(a!=0||b>0)

{

P0 = 0xfb;// 1111 1011只选通第三位数码管

we = 1; //打开位选

we = 0; //关闭位选

P0 = leddata[b]; //显示3

du = 1;//打开段选

du = 0; //关闭段选

delay(2);//延时

}

P0 = 0xf7;//1111 0111 只选通第四位数码管

we = 1; //打开位选

we = 0; //关闭位选

P0 = leddata[c]; //显示4

du = 1;//打开段选

du = 0; //关闭段选

delay(2);//延时

}

}

if(SG==1) //设定上限报警

{

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