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#include<reg51.h> #define uchar unsigned char #define uint unsigned int sbit wr=P3^6; sbit rd=P3^7; sbit cs=P3^5; uchar code tab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};//共陰數(shù)碼管碼表 uchar s,g,f,l,x;//數(shù)碼管顯示變量 float A;
uint K; void delay(uint); void adc(); void adc() { //啟動(dòng)ADC0804采樣// cs=0;wr=0;rd=1; delay(50); cs=1;wr=1;rd=1; //WR由低到高時(shí)，AD開(kāi)始轉(zhuǎn)換 delay(100); //讀AD數(shù)值// cs=0;wr=1;rd=0;//讀取轉(zhuǎn)換數(shù)據(jù)結(jié)果 delay(50); A=P1;//P1的新數(shù)據(jù)賦值給adval，用于數(shù)碼管顯示的s g f的分離 A=A*144/256; K=P1*144/256; cs=1;wr=1;rd=1;//停止AD讀取 } void main() { uint s,g,f,l,x; while(1) { adc();
s=K/10; l=s/10; x=s%10; g=K%10; f=(A-K)*10; P2=0XFE; //11111110 選中十位數(shù)碼管 P0=tab[l]; //顯示 delay(50); P2=0XFD; //11111110 選中十位數(shù)碼管 P0=tab[x]; //顯示 delay(50); P2=0XFB; //11111101 選中個(gè)位數(shù)碼管 P0=tab[g]+0x80; //顯示 delay(50);
P2=0XF7;//11111011 選中小數(shù)點(diǎn)后數(shù)碼管 P0=tab[f]; //顯示 delay(50); } } void delay(uint m)//延時(shí)子程序，約500個(gè)機(jī)器周期 { while(m--);｝
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