中断控制51单片机产生方波、锯齿波、正弦波.docx

基于Proteus的仿真图：

程序代码：

#include<reg52.h>
#include<intrins.h>
#defineucharunsignedchar
#defineuintunsignedint
sbitcs_wr1=P2^7;
uintcounter=0;
ucharcodesin[]={
135,145,158,167,176,188,199,209,218,226,234,240,245,249,252,254,254,253,251,247,243,237,230,222,213,204,193,182,170,158,
146,133,121,108,96,84,72,61,50,41,32,24,17,11,7,3,1,0,0,2,5,9,14,20,28,36,45,55,66,78,90,102,114,128
};

voiddelay(uintx)
{
while(x--);
}
voidmain()
{
uinti,j;
IT0=1;
IE=0x81;
P1=0x00;
while(1)
{
if(counter==0)
{
P1=~P1;
cs_wr1=0;
_nop_();
_nop_();
cs_wr1=1;
delay(500);
}

if(counter==1)
{
for(i=0;i<255;i++)
{
P1=i;
cs_wr1=0;
_nop_();
_nop_();
cs_wr1=1;
delay(1);
}
}

if(counter==2)
{
for(i=0;i<255;i++)
{
P1=i;
cs_wr1=0;
_nop_();
_nop_();
cs_wr1=1;
delay(1);
}
for(j=255;j>0;j--)
{
P1=j;
cs_wr1=0;
_nop_();
_nop_();
cs_wr1=1;
delay(1);
}
}

if(counter==3)
{
for(i=0;i<64;i++)
{
P1=sin[i];
cs_wr1=0;
_nop_();
_nop_();
cs_wr1=1;
delay(1);
}
}

}
}

isr_it0()interrupt0
{
counter++;
if(counter==4)
counter=0;
}