量程自动切换数字电压表C语言原程序.doc

C语言原程序如下：#include #define uchar unsigned char;uchar code scan_con=0x03,0x02,0x01,0x00; /定义列扫描uchardispcode=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00;/定义09的显示段码uchar dispbuf8=0,0,0,0,0,0,0,0; /定义8个存储空间uchar dispcount=0; uchar getdata; unsigned int temp;/定义暂存空间uchar i,j,k,l,m;sbit s3=P27; /位定义，控制模拟开关sbit s2=P26;sbit s1=P25;sbit dp=P17; /定义小数点#define v20_on s3=1;s2=0;s1=0; /宏定义不同量程，不同的开关状态#define v2_on s3=0;s2=1;s1=0;#define v02_on s3=0;s2=0;s1=1;sbit ST=P20; /定义单片机和ADC的控制信号sbit OE=P21; sbit EOC=P22; main() while(1) _20v: /220V量程v20_on;ST=0; /启动A/D转换ST=1;ST=0; while(EOC=0);OE=0;getdata=P0;OE=1;if(getdata21) /量程不合适，切换goto _2v; l=3;temp=getdata; /量程合适，数据处理temp=temp*100;temp=(temp/51)*5;goto disp; /跳到数码管显示程序段_2v: /200MV2V量程v2_on;ST=0;ST=1;ST=0; while(EOC=0);OE=0;getdata=P0;OE=1;if(getdata204)goto _20v;l=2;temp=getdata;temp=(temp*100/51)*10;temp=temp/2;goto disp;_02v: /0200MV量程v02_on;ST=0;ST=1;ST=0; while(EOC=0);OE=0;getdata=P0;OE=1;if(getdata204)goto _2v;l=1;temp=getdata;temp=(temp*100/51)*100;temp=temp/20;disp:dispbuf0=0; dispbuf1=0; dispbuf2=0; dispbuf3=0; dispbuf4=0; dispbuf5=0; dispbuf6=0; dispbuf7=0;i=0;while(temp/10) /电压值的每个位计算 dispbufi=temp%10; temp=temp/10; i+; dispbufi=temp;for(k=0;k=3;k+) /数码管显示P1=dispcodedispbufk; P3=scan_conk;if(l=3)if(k=2) P1=P1 | 0x80; /小数点的确定else if(l=2) if(k=3) P1=P1 | 0x80; el