基于51单片机的AD转换设计

#include<reg51.h> #define uchar unsigned char #define uint unsigned int sbit OE=P3^0; sbit OPEN=P3^1; sbit EOC=P3^2; sbit A_da=P3^3; sbit B_da=P3^4; sbit C_da=P3^5; void PC(); uint in=0; uchar r[4]; uchar a[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; uchar duan[]={0x01,0x02,0x04,0x08}; void delay1ms(uint m){ uint i,j; for(i=0;i<m;i++) for(j=0;j<110;j++); } void main(){ EA=1; IT0=1; EX0=1; while(1){ OPEN=0; A_da=0; B_da=0; C_da=0; OPEN=1; OPEN=0; delay1ms(5);} } void InT0(void) interrupt 0{ uchar m; OE=1; in=P1; in=in*1.96; //将数据转换为十进制(5V/256约等于1.96） OE=0; r[0]=a[in%10]; r[1]=a[in/10%10]; r[2]=a[in/100%10]; r[3]=a[in/1000]; for(m=0;m<200;m++){ PC();} } void PC(){ P2=duan[0]; P0=r[3]; delay1ms(1); P2=0x00; P2=duan[1]; P0=r[2]+128; delay1ms(1); P2=0x00; P2=duan[2]; P0=r[1]; delay1ms(1); P2=0x00; P2=duan[3]; P0=r[0]; delay1ms(1); P2=0x00; }