Question

c语言单片机里的中断嵌套问题，下面的程序执行不了优先级高的中断，帮我看看出了什么问题

#include<reg51.h>
#define uint unsigned int
#define uchar unsigned char
uchar code shu[31]={ 0x30,0x29,0x28,0x27,
0x26,0x25,0x24,0x23,0x22,0x21,0x20,0x19,
0x18,0x17,0x16,0x15,0x14,0x13,0x12,0x11,0x10, 0x09,
0x08,0x07, 0x06,0x05,0x04,0x03,0x02,0x01,0x00
};
uchar code shu1[]={ 0x05,0x04,0x03,0x02,0x01,0x00};
uchar code shu2[]={ 0x10, 0x09,0x08,0x07, 0x06,0x05,0x04,0x03,0x02,0x01,0x00};
sbit nbred=P0^3;
sbit nbgreen=P0^4;
sbit nbyellow=P0^5;
sbit dxred=P0^0;
sbit dxgreen=P0^1;
sbit dxyellow=P0^2;
uint time=0;
uchar flash=0;
uchar type=1;
uint i;
void delay ()
{uint a;
TH1=-50000/256;
TL1=-50000%256;
TR1=1;
for(a=0;a<20;)
{if(TF1==1)
{a++;
TF1=0 ;
TH1=-50000/256;
TL1=-50000%256;
}
return;
}

}
void abc ( ) interrupt 1 //内部中断T0
{ TH0=-50000/256;
TL0=-50000%256;
switch(type)
{case 1:
{

dxgreen=1;nbred=1;nbgreen=0;
nbyellow=0;dxred=0;dxyellow=0;
P1=shu[time/20];
if(time++!=600) return;
time=0;
type=2;break;
}
case 2:
{
if(++time!=10) return;

time=0;
dxgreen=0;nbred=0;dxyellow=!dxyellow;nbyellow=!nbyellow;
P1=shu1[flash/2] ;
if(flash++!=10) return;
flash=0;
type=3;
break;
}
case 3:
{
dxgreen=0;nbred=0;nbgreen=1;
nbyellow=0;dxred=1;dxyellow=0;
P1=shu[time/20];
if(time++!=600) return;
time=0;
type=4;break;
}
case 4:
{
if(++time!=10) return;
time=0;
dxred=0;nbgreen=0;dxyellow=!dxyellow;nbyellow=!nbyellow;
P1=shu1[flash/2] ;
if(flash++!=10) return;
flash=0;
type=1;
break;
}
}
}
void def ( ) interrupt 0
{ uint b,a=0;
dxgreen=0;nbred=1;nbgreen=0;
nbyellow=0;dxred=1;dxyellow=0;
for(b=0;b<11;b++)
{
P1=shu2[a++];
delay();
}
return;
}
main()
{ TMOD=0x11;
TH0=-50000/256;
TL0=-50000%256;
IP=0x01;
EA=1;
ET0=1; //开启第一个T0内部中断的分开关
TR0=1; //第一个中断的计数开始
EX0=1; //第二个INT0开启分开关
IT0=1;//下降沿触发
while(1);
}

Answer 1

你在interrupt 0 执行delay()函数干什么？你知道这中断多长时间执行一次，一次delay有多长时间吗？

追问

我已经找到问题了

有delay的原因也有，一开始设置tmod的问题，，

Answer 2

哪里显示出
优先级高的中断