51单片机波形发生器程序

#include

sbit wr=P3^6; //P3.6为DAC0832输入寄存器的写信号WR1，低电平有效sbit cs=P3^0; //P3.0为DAC0832片选信号CS，低电平有效

unsigned char k,t;

sbit led1=P3^1; //波形指示灯

sbit led2=P3^3;

sbit led3=P3^4;

sbit led4=P3^5;

//正弦波数据

unsigned char code Table[]={ 0x7F,0x8A,0x96,0xA1,0xAC,0xB6,0xC0,0xCA,

0xD3,0xDB,0xE3,0xE9,0xEF,0xF4,0xF8,0xFB,

0xFD,0xFE,0xFE,0xFD,0xFB,0xF8,0xF4,0xEF,

0xE9,0xE3,0xDB,0xD3,0xCA,0xC0,0xB6,0xAC,

0xA1,0x96,0x8A,0x7F,0x74,0x68,0x5D,0x52,

0x48,0x3E,0x34,0x2B,0x23,0x1B,0x15,0x0F,

0x0A,0x06,0x03,0x01,0x00,0x00,0x01,0x03,

0x06,0x0A,0x0F,0x15,0x1B,0x23,0x2B,0x34,

0x3E,0x48,0x52,0x5D,0x68,0x74};

void Delay(int Time_ms);

void Int0();

void main()

{

unsigned char i;

k=0;

EX0=1;

IT0=1;

EA=1;

cs=0;

while(1)

{

if(k==0) //锯齿波

{

led1=0;led2=1;led3=1;led4=1;

t++;

wr=1;

P0=t;

wr=0;

Delay(1);

}

else if(k==1) //方波

{

led1=1;led2=0;led3=1;led4=1;

wr=1;

P0=0xff;

wr=0;

Delay(60);

wr=1;

P0=0x00;

wr=0;

Delay(60);

}

else if(k==2) //正弦波

{

led1=1;led2=1;led3=0;led4=1;

wr=1;

P0=Table[t+20];

wr=0;

Delay(2);

t++;

if(t==69) t=0;

else if(t==0xff) i=1;

}

else if(k==3) //三角波

{

led1=1;led2=1;led3=1;led4=0;

for(i=0;i<255;i++)

{

wr=1;

P0=i;

wr=0;---------------------

Delay(1);

}

while(i--)

{

wr=1;

P0=i;

wr=0;

Delay(1);

}

}

}

}

void Delay(int Time_ms)

{

int i;

unsigned char j;

for(i=0;i

{

for(j=0;j<150;j++)

{

}

}

}

void Int0() interrupt 1

{

k++;

t=0;

if(k==4)k=0;

return;

}