基于STC89C51的数字电压表

#include "reg52.h" sbit duan = P2^6; sbit wei = P2^7; sbit ADC_RD = P3^7; sbit ADC_WR = P3^6; sbit ADC_CS = P0^7; sbit led = P2^5; int code table1[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; int code table2[] = {0x5F,0x6F,0x77}; int table[3]={1,2,3}; void delayms(int xms);/*延时程序*/ void ADC_date();/*ADC获取数据*/ void disply(); int valu,s=0; void main() { led = 1; ADC_date(); while(1) { disply(); ADC_date(); } } void ADC_date() /*ADC获取数据*/ { wei = 1; ADC_CS = 0; ADC_WR = 0; ADC_WR = 1; ADC_RD = 0; ADC_RD = 1; valu = P1; wei = 0; } void disply()/*数码管显示电压*/ { int i,ge,shi,bai,v; v = ((valu*100)/255)*5; ge = v%10; shi = v%100/10; bai = v/100; table[0] = ge; table[1] = shi; table[2] = bai; for(i=0;i<3;i++) { if(i!=2) /*添加小数点*/ { wei = 1; P0 = table2[i]; wei = 0; P0=0xff; duan = 1; P0 = table1[table[i]]; duan = 0; delayms(1); P0=0xff; } else { wei = 1; P0 = table2[i]; wei = 0; P0=0xff; duan = 1; P0 = table1[table[i]]|0x80; duan = 0; delayms(3); P0=0xff; } } } void delayms(int xms)/*延时函数*/ { int i,j; for(i=xms;i>0;i--) for(j=110;j>0;j--); }