89C51 and ad0832 output sine wave, triangle wave, rectangular wave, sawtooth wave

Proteus simulation circuit diagram

C language program

1. #include   

2. #include   

3.   

4. #define DA0832 XBYTE[0xfffe]  

5.   

6. #define uchar unsigned char  

7. #define uint unsigned int  

8.   

9. sbit S1 = P1^0;  

10. sbit S2 = P1^1;  

11. //00 sawtooth wave; 01 square wave; 10 triangle wave; 11 sine wave  

12.   

13. uchar code sin_tab[] = //sine wave output table  

14. {  

15.      0x80,0x83,0x86,0x89,0x8D,0x90,0x93,0x96,0x99,0x9C,0x9F,0xA2,0xA5,0xA8,0xAB,0xAE,  

16.      0xB1,0xB4,0xB7,0xBA,0xBC,0xBF,0xC2,0xC5,0xC7,0xCA,0xCC,0xCF,0xD1,0xD4,0xD6,0xD8,  

17.      0xDA,0xDD,0xDF,0xE1,0xE3,0xE5,0xE7,0xE9,0xEA,0xEC,0xEE,0xEF,0xF1,0xF2,0xF4,0xF5,  

18.      0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFD,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,  

19.      0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFD,0xFD,0xFC,0xFB,0xFA,0xF9,0xF8,0xF7,0xF6,  

20.      0xF5,0xF4,0xF2,0xF1,0xEF,0xEE,0xEC,0xEA,0xE9,0xE7,0xE5,0xE3,0xE1,0xDF,0xDD,0xDA,  

21.      0xD8,0xD6,0xD4,0xD1,0xCF,0xCC,0xCA,0xC7,0xC5,0xC2,0xBF,0xBC,0xBA,0xB7,0xB4,0xB1,  

22.      0xAE,0xAB,0xA8,0xA5,0xA2,0x9F,0x9C,0x99,0x96,0x93,0x90,0x8D,0x89,0x86,0x83,0x80,  

23.      0x80,0x7C,0x79,0x76,0x72,0x6F,0x6C,0x69,0x66,0x63,0x60,0x5D,0x5A,0x57,0x55,0x51,  

24.      0x4E,0x4C,0x48,0x45,0x43,0x40,0x3D,0x3A,0x38,0x35,0x33,0x30,0x2E,0x2B,0x29,0x27,  

25.      0x25,0x22,0x20,0x1E,0x1C,0x1A,0x18,0x16,0x15,0x13,0x11,0x10,0x0E,0x0D,0x0B,0x0A,  

26.      0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00,  

27.      0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,  

28.      0x0A,0x0B,0x0D,0x0E,0x10,0x11,0x13,0x15,0x16,0x18,0x1A,0x1C,0x1E,0x20,0x22,0x25,  

29.      0x27,0x29,0x2B,0x2E,0x30,0x33,0x35,0x38,0x3A,0x3D,0x40,0x43,0x45,0x48,0x4C,0x4E,  

30.      0x51,0x55,0x57,0x5A,0x5D,0x60,0x63,0x66,0x69,0x6C,0x6F,0x72,0x76,0x79,0x7C,0x7E  

31. };  

32.   

33. void Delay_MS(uint);// delay   

34. void stair(uchar AMP);//sawtooth wave   

35. void square(uchar AMP, uchar THL,uchar TLL);//方波   

36. void trian(uchar AMP); //triangle wave   

37. void sin(); //sine wave   

38. void scan(); //scan function   

39.   

40.   

41. void main()  

42. {     

43.     while(1)  

44.     {  

45.         //Test one by one   

46.         //stair(200);  

47.         //square(200,10,10);  

48.         //trian(200);  

49.         //sin();  

50.         scan();  

51.     }  

52. }  

53.   

54. void scan()  

55. {  

56.     if((0 == S1) &&(0 == S2))  

57.         stair(200);  

58.     else if((1 == S1) && (0 == S2))  

59.         square(200,10,10);  

60.     else if((0 == S1) && (1 == S2))  

61.         trian(200);  

62.     else  

63.         sin();  

64.           

65.           

66.       

67. }  

68. void Delay_MS(uint n)  

69. {  

70.     uint k;  

71.     for(n; n  >0 ;n--)  

72.         for(k = 10; k > 0 ;k--);  

73. }  

74.   

75. void stair(uchar AMP)  

76. {  

77.     flying i;  

78.     for(i = 0 ;i < 255; i++)  

79.     {  

80.         DA0832 = i;  

81.     }  

82.        

83. }  

84.   

85. void square(uchar AMP, uchar THL, uchar TLL)  

86. {  

87.     DA0832 = 255 - AMP;  

88.     Delay_MS(THL);  

89.     DA0832 = 255;  

90.     Delay_MS(TLL);  

91. }  

92.   

93. void trian(uchar AMP)  

94. {  

95.     flying i;  

96.     for(i = 255 - AMP ;i < 255; i++)  

97.     {  

98.         DA0832 = i;  

99.     }  

100.       

101.     for(i-1 ;i > 255 - AMP; i--)  

102.     {  

103.         DA0832 = i;  

104.     }  

105. }  

106.   

107. void sin()  

108. {  

109.     flying i;  

110.     for(i = 0; i < 255; i++)  

111.     {  

112.         DA0832 = sin_tab[i];  

113.     }  

114. }   

Output waveform