1 /*电压表 精确到小数点后面三位*/ 2 /*连线：电位器接IN0，AD_CS接CS0,CS1接KEY/LED_CS*/ 3 #include<reg52.h> 4 typedef unsigned char uchar; 5 xdata uchar LED_CS _at_ 0x9000; 6 xdata uchar LED_OUTSEG _at_ 0x9004; 7 xdata uchar LED_OUTBIT _at_ 0x9002; 8 9 xdata uchar AD_CS _at_ 0x8000; 10 xdata uchar AD_MODE _at_ 0x8003; 11 12 code unsigned char LEDMAP[] = { // 八段管显示码 13 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 14 0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71 15 }; 16 code unsigned char LEDWED[] = {0x20,0x10,0x08,0x04,0x02,0x01}; 17 int num[6]; 18 void delay(int ms) 19 { 20 int i,j; 21 for(i=0;i<ms;i++) 22 for(j=0;j<14;j++) 23 ; 24 } 25 void adf() 26 { 27 AD_CS = 0; 28 delay(10); 29 } 30 void main() 31 { 32 int led_c=0; 33 unsigned char temp; 34 AD_MODE = 0x82; 35 AD_CS = 0; 36 while(1) 37 { 38 adf(); 39 delay(10); 40 num[0] = AD_CS*5/256; 41 num[1] = AD_CS*5%256*10/256; 42 num[2] = AD_CS*5%256*10%256*10/256; 43 num[3] = AD_CS*5%256*10%256*10%256*10/256; 44 temp = LEDMAP[num[led_c]]; 45 if(led_c == 0) 46 temp = temp|0x80; 47 LED_OUTBIT = LEDWED[led_c]; 48 LED_OUTSEG = temp; 49 led_c = (led_c+1)%4; 50 delay(10); 51 } 52 }