单片机定时器编程问题
时间:10-02
整理:3721RD
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#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
sbit wela=P2^7;
sbit dula=P2^6;
sbit d1=P1^0;
uint i;
uint num;
void main()
{
i=0;
num=-1;
TMOD=0x01;
TH0=(65535-50000)/256;
TL0=(65535-50000)%256;
EA=1;
ET0=1;
TR0=1;
while(1)
{if(i==20)
{
num=num+1;
i=0;
wela=1;
P0=0x66;
wela=0;
dula=1;
P0=table[num];
dula=0;
if(num==15)
num=-1;
}
}
}
void external() interrupt 1
{
TH0=(65535-50000)/256;
TL0=(65535-50000)%256;
i++;
}
#define uint unsigned int
#define uchar unsigned char
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
sbit wela=P2^7;
sbit dula=P2^6;
sbit d1=P1^0;
uint i;
uint num;
void main()
{
i=0;
num=-1;
TMOD=0x01;
TH0=(65535-50000)/256;
TL0=(65535-50000)%256;
EA=1;
ET0=1;
TR0=1;
while(1)
{if(i==20)
{
num=num+1;
i=0;
wela=1;
P0=0x66;
wela=0;
dula=1;
P0=table[num];
dula=0;
if(num==15)
num=-1;
}
}
}
void external() interrupt 1
{
TH0=(65535-50000)/256;
TL0=(65535-50000)%256;
i++;
}
一个简单的控制数码管循环的程序
为什么我把
while(1){
移到
TMOD=0x01;
TH0=(65535-50000)/256;
TL0=(65535-50000)%256;
EA=1;
ET0=1;
TR0=1;
之前,数码管就不会亮了
你看懂你到底怎么移动的
我刚开始想的,因为要中断好多次嘛,需要循环,就把定时器的启动程序,T0的中断程序都移到while(1)里面了,相当于把while(1)提到了最前面
中断的循环不需要你控制
这样啊……谢谢了!