51单片机自学手记之直流电压表.doc

*电路如下*程序如下*#include #include #define uchar unsigned char#define uint unsigned int#define ulong unsigned long#define ADC_REF 5 /这里宏定义是方便修改5这个数值，不需要一处一处去修改。uchar code shu_dian=0x40,0x79,0x24,0x30,0x19,/0,1,2,3,4, 0x92,0x82,0xf8,0x80,0x90,/5,6,7,8,9, 0x00,0xff; /带小数点uchar code shu=0xc0,0xf9,0xa4,0xb0,0x99,/0,1,2,3,4, 0x92,0x82,0xf8,0x80,0x90,/5,6,7,8,9, 0x00,0xff;/不带小数点sbit wei1 = P13;sbit wei2 = P12;sbit wei3 = P11;sbit wei4 = P10;void display(uint ADC_DATA);void delay(uchar i);uint AD_PROCESS(void);sbit CS=P35;sbit DATA=P34;sbit CLK=P33;/*系统初始化程序*/void sysint()CS = 1; /当需要转换时需先将其置低电平并一直保持直到转换结束。DATA = 1;CLK = 1; /*ADC处理程序*/uchar ADC0832()uchar ii,adcdata;adcdata=0x00;CS=0; /ADC启用CLK=0;/根据时序图时钟脉冲先低后高CLK=1;_nop_();DATA = 1; /启始信号CLK=1;CLK=0;CLK=1;DATA = 0;/通道选择CH0CLK=0;CLK=1;DATA=1;/通道选择CH0CLK=0;CLK=1;for(ii=0;ii8;ii+) CLK=0; /每一个时钟下降沿送出一位数据 adcdata=adcdata*2; /？WSMYCY2 adcdata=adcdata|DATA; /？ 从端口上读取转换的数据 CLK=1;CS=1; /转换、数据处理结束禁用ADC芯片return adcdata;/*主程序*/void main()uint ADC_VALUE_1;sysint();while(1)ADC_VALUE_1 = AD_PROCESS(); /读取AD函数display(ADC_VALUE_1); /把读取到的数据送到数码管显示void display(uint ADC_DATA)P0 = shu_dian(ADC_DATA*10)/1000;/这里*10是为了能够分到4位数码管上面，如果不*10那么得出来的数只有2位数的话，显示就不正常了wei2 = 1; /千位显示（带小数点）wei3 = 1;wei4 = 0;delay(1); wei4 = 1;P0 = shu(ADC_DATA*10)%1000/100;wei3 = 0; /百位显示wei1 = 1;wei2 = 1;delay(1);wei3 = 1;P0 = shuADC_DATA%100/10; wei2 = 0;wei1 = 1;/十位显示wei4 = 1;delay(1);wei2 = 1;P0 = shuADC_DATA%10;wei1 = 0;wei3 = 1;wei4 = 1; /个位显示delay(1);wei1 = 1; void delay(uchar i)/延时子函数uint k,r;for(k=0;ki;k+)for(r=0;r50;r+);uint AD_PROCESS(void) /ADC处理程序uint i,y,ADC_VALUE;i = ADC0832();/进来以后首先第一次读取8位ADADC_VALUE = (i*100/255)*ADC_REF; /把读取的数值转换成电压for(y=0;y4;y+) /1 /2i = ADC0832(); /3ADC_VALUE = ADC_VALUE+(i*100/