51单片机计时器问题：我想设置计时器计时在数码管显示的同时pwm控制led灯亮，但是只有数码管显示，led灯不亮，请问应该怎么修改啊
#include<reg52.h>
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
sbit beep=P2^3;
sbit S2=P3^0;
sbit S3=P3^1;
sbit LED1 =P1^3;
uchar time = 0;
unsigned char halt,j,k,a1,a0,b1,b0,c1,c0,hour,minute,second,n=255;
unsigned int pp;
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void delay(unsigned char i)//延时函数
{
for(j=i;j>0;j--);
}
void display(uchar shi2,uchar shi1,uchar fen2,uchar fen1,uchar miao2,uchar miao1)//数码管显示
{
dula=0;
P0=table[shi2];
dula=1;
dula=0;
wela=0;
P0=0xfe;
wela=1;
wela=0;
delay(5);
P0=table[shi1]|0x80;
dula=1;
dula=0;
P0=0xfd;
wela=1;
wela=0;
delay(5);
P0=table[fen2];
dula=1;
dula=0;
P0=0xfb;
wela=1;
wela=0;
delay(5);
P0=table[fen1]|0x80;
dula=1;
dula=0;
P0=0xf7;
wela=1;
wela=0;
delay(5);
P0=table[miao2];
dula=1;
dula=0;
P0=0xef;
wela=1;
wela=0;
delay(5);
P0=table[miao1];
dula=1;
dula=0;
P0=0xdf;
wela=1;
wela=0;
delay(5);
}
void time0init()//定时器初始化
{
TMOD=0x01;
TR0=1;
TH0=(65536-46080)/256;
TL0=(65536-46080)%256;//46080=50000*11.0592/12
ET0=1;
EA=1;
}
void keyscan()//按键控制中断
{
if(S2==0)
delay(10);
if(S2==0)
{
halt=1;
while (!S2);
}
if(S3==0)
{
delay (10);
halt=0;
while (!S3);
}
}
void jishi ()//计时
{
while(1)
{
keyscan();
if(halt==0)
{
TR0=1;
if(pp==20)
{
pp=0;
second++;
if(second==60)
{
second=0;
minute++;
if(minute==60)
{
minute=0;
hour++;
if(hour==99)
{
hour=0;
}
}
}
}
a0=hour%10;
a1=hour/10;
b0=minute%10;
b1=minute/10;
c0=second%10;
c1=second/10;
display(a1,a0,b1,b0,c1,c0);
}
else
TR0=0;
display(a1,a0,b1,b0,c1,c0);
}
}
void main()
{
while (1)
{
uchar x,y;
time0init();
jishi ();
for (x=0;x<50;x++)//pwm控制led灯
{
for (y=15;y>0;y--)
{
LED1=0;
delay(x);
LED1=1;
delay(50-x);
}
}
for (x=50;x>0;x--)
{
for (y=15;y>0;y--)
{
LED1=0;
delay(x);
LED1=1;
delay(50-x);
}
}
}
}
void time0() interrupt 1//定时器中断
{
TH0=(65536-46080)/256;
TL0=(65536-46080)%256;
pp++;
}
