量程自動(dòng)切換數(shù)字電壓表C語言原程序.doc

C語言原程序如下：#include #define uchar unsigned char;uchar code scan_con=0x03,0x02,0x01,0x00; /定義列掃描uchardispcode=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00;/定義09的顯示段碼uchar dispbuf8=0,0,0,0,0,0,0,0; /定義8個(gè)存儲(chǔ)空間uchar dispcount=0; uchar getdata; unsigned int temp;/定義暫存空間uchar i,j,k,l,m;sbit s3=P27; /位定義，控制模擬開關(guān)sbit s2=P26;sbit s1=P25;sbit dp=P17; /定義小數(shù)點(diǎn)#define v20_on s3=1;s2=0;s1=0; /宏定義不同量程，不同的開關(guān)狀態(tài)#define v2_on s3=0;s2=1;s1=0;#define v02_on s3=0;s2=0;s1=1;sbit ST=P20; /定義單片機(jī)和ADC的控制信號(hào)sbit OE=P21; sbit EOC=P22; main() while(1) _20v: /220V量程v20_on;ST=0; /啟動(dòng)A/D轉(zhuǎn)換ST=1;ST=0; while(EOC=0);OE=0;getdata=P0;OE=1;if(getdata21) /量程不合適，切換goto _2v; l=3;temp=getdata; /量程合適，數(shù)據(jù)處理temp=temp*100;temp=(temp/51)*5;goto disp; /跳到數(shù)碼管顯示程序段_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) /電壓值的每個(gè)位計(jì)算 dispbufi=temp%10; temp=temp/10; i+; dispbufi=temp;for(k=0;k=3;k+) /數(shù)碼管顯示P1=dispcodedispbufk; P3=scan_conk;if(l=3)if(k=2) P1=P1 | 0x80; /小數(shù)點(diǎn)的確定else if(l=2) if(k=3) P1=P1 | 0x80; el