89C51与ad0832 输出正弦波，三角波，矩形波，锯齿波

#include <absacc.h>
#include <reg52.h>

#define DA0832 XBYTE[0xfffe]

#define uchar unsigned char
#define uint unsigned int

sbit S1 = P1^0;
sbit S2 = P1^1;
//00锯齿波；01方波；10三角波；11正弦波

uchar code sin_tab[] =        //正弦波输出表
{
0x80,0x83,0x86,0x89,0x8D,0x90,0x93,0x96,0x99,0x9C,0x9F,0xA2,0xA5,0xA8,0xAB,0xAE,
0xB1,0xB4,0xB7,0xBA,0xBC,0xBF,0xC2,0xC5,0xC7,0xCA,0xCC,0xCF,0xD1,0xD4,0xD6,0xD8,
0xDA,0xDD,0xDF,0xE1,0xE3,0xE5,0xE7,0xE9,0xEA,0xEC,0xEE,0xEF,0xF1,0xF2,0xF4,0xF5,
0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFD,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFD,0xFD,0xFC,0xFB,0xFA,0xF9,0xF8,0xF7,0xF6,
0xF5,0xF4,0xF2,0xF1,0xEF,0xEE,0xEC,0xEA,0xE9,0xE7,0xE5,0xE3,0xE1,0xDF,0xDD,0xDA,
0xD8,0xD6,0xD4,0xD1,0xCF,0xCC,0xCA,0xC7,0xC5,0xC2,0xBF,0xBC,0xBA,0xB7,0xB4,0xB1,
0xAE,0xAB,0xA8,0xA5,0xA2,0x9F,0x9C,0x99,0x96,0x93,0x90,0x8D,0x89,0x86,0x83,0x80,
0x80,0x7C,0x79,0x76,0x72,0x6F,0x6C,0x69,0x66,0x63,0x60,0x5D,0x5A,0x57,0x55,0x51,
0x4E,0x4C,0x48,0x45,0x43,0x40,0x3D,0x3A,0x38,0x35,0x33,0x30,0x2E,0x2B,0x29,0x27,
0x25,0x22,0x20,0x1E,0x1C,0x1A,0x18,0x16,0x15,0x13,0x11,0x10,0x0E,0x0D,0x0B,0x0A,
0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,
0x0A,0x0B,0x0D,0x0E,0x10,0x11,0x13,0x15,0x16,0x18,0x1A,0x1C,0x1E,0x20,0x22,0x25,
0x27,0x29,0x2B,0x2E,0x30,0x33,0x35,0x38,0x3A,0x3D,0x40,0x43,0x45,0x48,0x4C,0x4E,
0x51,0x55,0x57,0x5A,0x5D,0x60,0x63,0x66,0x69,0x6C,0x6F,0x72,0x76,0x79,0x7C,0x7E
};

void Delay_MS(uint);// delay
void stair(uchar AMP);//锯齿波
void square(uchar AMP, uchar THL,uchar TLL);//方波
void trian(uchar AMP);//三角波
void sin();//正弦波
void scan();//扫描函数

void main()
{
while(1)
{
//逐个测试
//stair(200);
//square(200,10,10);
//trian(200);
//sin();
scan();
}
}

void scan()
{
if((0 == S1) &&(0 == S2))
stair(200);
else if((1 == S1) && (0 == S2))
square(200,10,10);
else if((0 == S1) && (1 == S2))
trian(200);
else
sin();

}
void Delay_MS(uint n)
{
uint k;
for(n; n  >0 ;n--)
for(k = 10; k > 0 ;k--);
}

void stair(uchar AMP)
{
uchar i;
for(i = 0 ;i < 255; i++)
{
DA0832 = i;
}

}

void square(uchar AMP, uchar THL, uchar TLL)
{
DA0832 = 255 - AMP;
Delay_MS(THL);
DA0832 = 255;
Delay_MS(TLL);
}

void trian(uchar AMP)
{
uchar i;
for(i = 255 - AMP ;i < 255; i++)
{
DA0832 = i;
}

for(i-1 ;i > 255 - AMP; i--)
{
DA0832 = i;
}
}

void sin()
{
uchar i;
for(i = 0; i < 255; i++)
{
DA0832 = sin_tab[i];
}
}