求教制作的呼吸燈但是沒有達到預期漸亮漸滅的效果請各位大神看看哪兒出錯了感謝

ID:809988 · 發表于 2020-8-7 11:20

#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
#define TIME_1MS 65536-1000
long timer_ms=0;
void delay(uchar a1);
uchar a4;
void main()
{
uchar a=5,bb=0;
int aaa=0;
TMOD = 0x01;                   //set timer0 as mode1 (16-bit)
TL0 = TIME_1MS%256;                   //initial timer0 low byte
TH0 = TIME_1MS/256;             //initial timer0 high byte
TR0 = 1;                      //timer0 start running
ET0 = 1;                      //enable timer0 interrupt
EA = 1;
a4=0;
while(1)
{
      if(bb==0)
      {
         if(timer_ms==a)
         {
            P1=0XFF;
         }
         else if(timer_ms==20-a)
         {
               P1=0;
         }
      }
      else
      {
         if(timer_ms==a)
         {
            P1=0;
         }
         else if(timer_ms==20-a)
         {
               P1=0xff;
         }
      }
if(timer_ms>=21)timer_ms=0;

      aaa++;
      if(aaa == 3000)
      {
a++;
if(a==20)
{
bb=~bb;
a=5;
}
         aaa=0;
      }
}
}

void timero() interrupt 1
{
TL0 = (65536-1000)%256;                   //initial timer0 low byte
TH0 = (65536-1000)/256;             //initial timer0 high byte
timer_ms++;
}
void delay(uchar a1)
{
char a2,a3;
for(a2=0;a2<a1;a2++)
for(a3=0;a3<250;a3++);

}