求大佬帮忙啊!要求设计3个led灯模拟红黄绿,并以20,15,10s进行倒计时,红20s到黄15s到绿10s,然后进行循环,自己写了程序,但是不对,只有红灯是正确的。恳求大佬们帮助!!!!!!!(最好可以讲一下原理)
代码:
#include
#define uchar unsigned char
#define uint unsigned int
sbit dula=P2^6;
sbit wela=P2^7;
sbit led1=P1^0;
sbit led2=P1^1;
sbit led3=P1^2;
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void delayms(uint);
void display(uchar,uchar);
uchar count,shi,ge;
uchar num=20,num1=15,num2=10;
void display(uchar shi,uchar ge)
{
dula=1;
P0=table[shi];
dula=0;
P0=0xff;
wela=1;
P0=0xfe;
wela=0;
delayms(5);
dula=1;
P0=table[ge];
dula=0;
P0=0xff;
wela=1;
P0=0xfd;
wela=0;
delayms(5);
}
void delayms(uint xms)
{
uint i,j;
for(i=xms;i>0;i--)
for(j=110;j>0;j--);
}
void init()
{
TMOD=0x01; //0000 0001
TH0=(65536-45872)/256;
TL0=(65536-45872)%256;
EA=1;
ET0=1;
TR0=1;
}
void main()
{
init();
while(1)
{
display(shi,ge);
}
}
void T0_time() interrupt 1
{
TH1=(65536-45872)/256;
TL1=(65536-45872)%256;
count++;
if(count==5) //20
{
count=0;
led1=0;
if(num==0)
{
led1=1;
led2=0;
delayms(20);
if(num1==0)
{
led2=1;
led3=0;
delayms(20);
if(num2==0)
{
led3=1;
led1=0;
delayms(20);
}
shi=num2/10;
ge=num2%10;
num2--;
}
shi=num1/10;
ge=num1%10;
num1--;
}
shi=num/10;
ge=num%10;
num--;
}
}