/*频率1k恒定,双波互补输出,占空比按照5%变化*/
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit k1=P3^4;
sbit k2=P3^5;
sbit pwm1=P2^0;
sbit pwm2=P2^1;
sbit dula=P2^6;
sbit wela=P2^7;
void init();
void disp(uchar num);
void keyscan();
void delay(uint x);
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,
0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};
uchar num,p1,num1,num2,D;
main()
{
init();
while(1)
{
keyscan();
if(num!=0&&num!=20)
{
if(p1<=num)
{
pwm1=1;
pwm2=0;
}
else
{
pwm1=0;
pwm2=1;
}
}
if(num==0)
{
pwm1=0;
pwm2=0;
}
if(num==20)
{
pwm1=1;
pwm2=1;
}
disp(D);
}
}
void init()
{
TMOD=0x01;
EA=1;
ET0=1;
TH0=0xff;
TL0=0xce;
TR0=1;
}
void delay(uint x)
{
uint i,j;
for(i=0;i<x;i++)
for(j=0;j<110;j++);
}
void keyscan()
{
if(k1==0)
{
delay(10);
if(k1==0)
{
num++;
D=D+5;
if(num==21)
num=0;
while(!k1);
}
}
if(k2==0)
{
delay(10);
if(k2==0)
{
num--;
D=D-5;
if(num==-1)
num=20;
while(!k2);
}
}
}
void disp(uchar a)
{
num1=a/10;
num2=a%10;
wela=1;
P0=0xfe;
wela=0;
dula=1;
P0=table[num1];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
dula=1;
P0=table[num2];
dula=0;
P0=0xff;
}
void timer0() interrupt 1
{
TH0=0xff;
TL0=0xce;
p1++;
if(p1==20)
p1=0;
}
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