51单片机控制adc0832的5v直流电压表

#include <reg51.h> #define uchar unsigned char #define uint unsigned int sbit lcden=P2^2; sbit lcdrs=P2^0; sbit lcdrw=P2^1; sbit cs=P3^4; sbit clk=P1^0; sbit dio=P1^1; uchar code table[]=" volt="; uchar num; //延时函数 void delay(uint z) { uint x,y; for(x=z;x>0;x--) for(y=110;y>0;y--); } //lcd写指令函数和写数据函数 void write_com(uchar com) { lcdrs=0; lcden=0; P0=com; delay(5); lcden=1; delay(5); lcden=0; } void write_data(uchar date) { lcdrs=1; lcden=0; P0=date; delay(5); lcden=1; delay(5); lcden=0; } //lcd初始化函数 void init() { lcdrw=0; lcden=0; write_com(0x38); write_com(0x0c); write_com(0x06); write_com(0x01); write_com(0x80); } //读adc0832数据 uchar dac0832() { uchar i,dat; cs=1; clk=0; cs=0; clk=1; dio=1; clk=0;//第一个脉冲下降沿 clk=1; dio=1; clk=0;//第二个脉冲下降沿 clk=1; dio=0; clk=0;//第三个脉冲下降沿 dio=1; clk=1;//第四个脉冲上升沿 for(i=0;i<8;i++) { clk=1; clk=0; dat<<=1; dat|=(uchar)dio; } cs=1; return dat; } void main() { uint AD_val;//读出转换数据 uchar Int,Dec;//Int存整数，Dec存小数 init(); while(1) { AD_val=dac0832(); Int=(AD_val)/51; Dec=(AD_val%51)*100/51; for(num=0;num<9;num++) { write_data(table[num]); delay(4); } write_data(0x30+Int); write_data(0x2e); write_data(0x30+Dec/10); write_data(0x30+Dec%10); write_data(0x56); write_com(0x02); } }