单片机实用8人抢答器

#include <AT89X51.H> #define uchar unsigned char #define uint unsigned int sbit key0=P1^0; sbit key1=P1^1; sbit key2=P1^2; sbit key3=P1^3; sbit key4=P1^4; sbit key5=P1^5; sbit key6=P1^6; sbit key7=P1^7; uchar code table1[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92, 0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e, 0xcf,0xff,0x76,0x79,0x38,0x3f,0}; uchar code table2[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; void delay(uint x) { uint i,j; for(i=x;i>0;i--) for(j=100;j>0;j--); } main() { while(1) { if(key0==0) { P0=table2[0]; delay(10); P3=table1[1]; delay(10); while(1); } if(key1==0) { P0=table2[1]; delay(10); P3=table1[2]; delay(10); while(1); } if(key2==0) { P0=table2[2]; delay(10); P3=table1[3]; delay(10); while(1); } if(key3==0) { P0=table2[3]; delay(10); P3=table1[4]; delay(10); while(1); } if(key4==0) { P0=table2[4]; delay(10); P3=table1[5]; delay(10); while(1); } if(key5==0) { P0=table2[5]; delay(10); P3=table1[6]; delay(10); while(1); } if(key6==0) { P0=table2[6]; delay(10); P3=table1[7]; delay(10); while(1); } if(key7==0) { P0=table2[7]; delay(10); P3=table1[8]; delay(10); while(1); } } }