Digital-to-Analog Converter ADC08009 Application

1 #include //header file

2 #define uchar unsigned char //macro definition of unsigned character type

3 #define uint unsigned int //macro definition unsigned integer

4 code uchar seg7code[10]={ 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; //Display segment code digital tube word and

5 uchar wei[4]={0XEf,0XDf,0XBf,0X7f}; //bit control end //bit control code

6 sbit ST=P3^0; //A/D start conversion signal

7 sbit OE=P3^1; //Data output enable signal

8 sbit EOC=P3^2; //A/D conversion end signal

9 sbit CLK=P3^3; //clock pulse

10 uint z,x,c,v,AD0809, date; //define data type

11 /************************************************ ******************

12 Delay function

13 ************************************************* *******************/

14 void delay(uchar t)

15 {

16 uchar i,j;

17 for(i=0;i

18 {

19 for(j=13;j>0;j--);

20 { ;

twenty one }

twenty two }

twenty three }

twenty four /************************************************ **********************

25 digital tube dynamic scanning

26 ************************************************* ************************/

27 void xianshi() //Display function

28 {

29 uint z,x,c,v;

30 z=date/1000; //Calculate the thousandth place

31 x=date%1000/100; //Calculate the hundreds place

32 c=date%100/10; //Find the tenth digit

33 v=date%10; //Find the unit digit

34

35 P2=0XFF;

36 P0=seg7code[z]&0x7f;

37 P2=wei[0];

38 delay(80);

39 P2=0XFF;

40 P0=seg7code[x];

41 P2=wei[1];

42 delay(80);

43 P2=0XFF;

44 P0=seg7code[c];

45 P2=wei[2];

46 delay(80);

47 P2=0XFF;

48 P0=seg7code[v];

49 P2=wei[3];

50 delay(80);

51 P2=0XFF;

52 }

53 /************************************************ *************************

54 CLK oscillation signal

55 ************************************************* *************************/

56 void timer0() interrupt 1 //Timer 0 working mode 1

57 {

58

59 TH0=(65536-2)/256; //Reload count initial value

60 TL0=(65536-2)%256; //Reload count initial value

61 CLK=!CLK; //Invert

62 }

63

64 /************************************************ *************************

65 Main function

66 ************************************************* *************************/

67 void main()

68 {

69 TMOD=0X01; //Timer interrupt 0

70

71 CLK=0; //The initial value of the pulse signal is 0

72 TH0=(65536-2)/256; //initial value of high 8 bits of timing time

73 TL0=(65536-2)%256; //initial value of the lower eight bits of the timing time

74 EA=1; //Open CPU interrupt

75 ET0=1; //Open T/C0 interrupt

76 TR0=1;

77 while(1) // infinite loop

78 {

79 ST=0; // Make the acquisition signal low

80 ST=1; //Start data conversion

81 ST=0; //Stop data conversion

82 while(!EOC); //Wait for data conversion to complete

83 OE=1; //Enable data output signal

84 AD0809=P1; //Read data

85 OE=0; //Turn off data output enable signal

86 if(AD0809>=251) //The voltage displayed cannot exceed 5V

87 AD0809=250;

88 date=AD0809*20; //The data value displayed by the digital tube, where 20 is the milliampere value of the collected data

89 xianshi(); //digital tube display function

90

91 }

92 }