（一）非常感谢：89C51与ad0832 输出正弦波，三角波，矩形波，锯齿波
（二）在上面的情况下进行程序的修改，实现50HZ的输出
（三）电路图
（三）输出方波
（四）输出锯齿波
（五）输出三角波
（六）输出正玄波
（七）程序
1 #include <absacc.h> 2 #include <reg52.h> 3 4 #define DA0832 P2 5 #define DATA 57 //定时器延时 6 7 #define uchar unsigned char 8 #define uint unsigned int 9 10 sbit S1 = P1^0; 11 sbit S2 = P1^1; 12 //00锯齿波；01方波；10三角波；11正弦波 13 14 uchar code sin_tab[] = //正弦波输出表 15 { 16 0x80,0x83,0x86,0x89,0x8D,0x90,0x93,0x96,0x99,0x9C,0x9F,0xA2,0xA5,0xA8,0xAB,0xAE, 17 0xB1,0xB4,0xB7,0xBA,0xBC,0xBF,0xC2,0xC5,0xC7,0xCA,0xCC,0xCF,0xD1,0xD4,0xD6,0xD8, 18 0xDA,0xDD,0xDF,0xE1,0xE3,0xE5,0xE7,0xE9,0xEA,0xEC,0xEE,0xEF,0xF1,0xF2,0xF4,0xF5, 19 0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFD,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, 20 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFD,0xFD,0xFC,0xFB,0xFA,0xF9,0xF8,0xF7,0xF6, 21 0xF5,0xF4,0xF2,0xF1,0xEF,0xEE,0xEC,0xEA,0xE9,0xE7,0xE5,0xE3,0xE1,0xDF,0xDD,0xDA, 22 0xD8,0xD6,0xD4,0xD1,0xCF,0xCC,0xCA,0xC7,0xC5,0xC2,0xBF,0xBC,0xBA,0xB7,0xB4,0xB1, 23 0xAE,0xAB,0xA8,0xA5,0xA2,0x9F,0x9C,0x99,0x96,0x93,0x90,0x8D,0x89,0x86,0x83,0x80, 24 0x80,0x7C,0x79,0x76,0x72,0x6F,0x6C,0x69,0x66,0x63,0x60,0x5D,0x5A,0x57,0x55,0x51, 25 0x4E,0x4C,0x48,0x45,0x43,0x40,0x3D,0x3A,0x38,0x35,0x33,0x30,0x2E,0x2B,0x29,0x27, 26 0x25,0x22,0x20,0x1E,0x1C,0x1A,0x18,0x16,0x15,0x13,0x11,0x10,0x0E,0x0D,0x0B,0x0A, 27 0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00, 28 0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09, 29 0x0A,0x0B,0x0D,0x0E,0x10,0x11,0x13,0x15,0x16,0x18,0x1A,0x1C,0x1E,0x20,0x22,0x25, 30 0x27,0x29,0x2B,0x2E,0x30,0x33,0x35,0x38,0x3A,0x3D,0x40,0x43,0x45,0x48,0x4C,0x4E, 31 0x51,0x55,0x57,0x5A,0x5D,0x60,0x63,0x66,0x69,0x6C,0x6F,0x72,0x76,0x79,0x7C,0x7E 32 }; 33 34 void stair(void);//锯齿波 35 void square(void);//方波 36 void trian();//三角波 37 void sin();//正弦波 38 void scan();//扫描函数 39 void Timer0Init(void); //75微秒@11.0592MHz 40 uchar flag = 0; 41 42 43 void main() 44 { 45 P2 = 0xff; 46 Timer0Init(); 47 while(1) 48 { 49 //逐个测试 50 //stair(); /*锯齿波*/ 51 // square(); /*方波*/ 52 // trian(); /*三角波*/ 53 // sin(); /*正弦波*/ 54 scan(); 55 } 56 } 57 58 void Timer0Init(void) //75微秒@11.0592MHz 59 { 60 61 TMOD = 0x01; //设置定时器模式 62 TH0 = (65536 - DATA) / 256; //设置定时初值 63 TL0 = (65536 - DATA) % 256; //设置定时初值 64 ET0 = 1; //TF0标志 65 TR0 = 1; //定时器0开始计时 66 EA = 1; 67 } 68 void timer0_ISR(void) interrupt 1 69 { 70 TH0 = (65536 - DATA) / 256; //设置定时初值 71 TL0 = (65536 - DATA) % 256; //设置定时初值 72 TR0 = 0; 73 flag = 1; 74 } 75 76 77 void scan() 78 { 79 if((0 == S1) &&(0 == S2)) 80 stair(); 81 else if((1 == S1) && (0 == S2)) 82 square(); 83 else if((0 == S1) && (1 == S2)) 84 trian(); 85 else 86 sin(); 87 88 } 89 90 91 void stair(void) 92 { 93 uchar i; 94 for(i = 0 ;i < 255; i++) 95 { 96 DA0832 = i; 97 TR0 = 1; 98 while(flag == 0); 99 flag = 0; 100 } 101 102 } 103 104 void square(void) 105 { 106 int i; 107 DA0832 = 0xff; 108 for(i = 0;i < 125;i++) 109 { 110 TR0 = 1; 111 while(flag == 0); 112 flag = 0; 113 } 114 DA0832 = 0x00; 115 for(i = 0;i < 125;i++) 116 { 117 TR0 = 1; 118 while(flag == 0); 119 flag = 0; 120 } 121 } 122 123 void trian(void) 124 { 125 uchar i; 126 for(i = 0 ;i < 125; i++) 127 { 128 DA0832 = i; 129 TR0 = 1; 130 while(flag == 0); 131 flag = 0; 132 } 133 134 for(i=125 ;i > 0; i--) 135 { 136 DA0832 = i; 137 TR0 = 1; 138 while(flag == 0); 139 flag = 0; 140 } 141 } 142 143 void sin() 144 { 145 uchar i; 146 for(i = 0; i < 255; i++) 147 { 148 DA0832 = sin_tab[i]; 149 TR0 = 1; 150 while(flag == 0); 151 flag = 0; 152 } 153 }