qiangdaqi.rar_qiangdaqi_单片机 抢答器_抢答器

#include <reg51.h> #include <intrins.h> #define uchar unsigned char #define uint unsigned int sbit K1 = P1^0; sbit K2 = P1^1; // K1对应SW19 K2对应Sw20 K3对应SW21 K4对应Sw22 sbit K3 = P1^2; sbit K4 = P1^3; sbit BEEP = P2^1; //蜂鸣器控制端口P21 uchar temp; void beep(); //蜂鸣器 void delay0(uchar x); //x*0.14MS //-------------------------------------------------- /* 延时子程序*/ void delay1(uchar x) { uchar j; while((x--)!=0) { for(j=0;j<125;j++) {;} } } //-------------------------------------------------- /**********************************************************/ void delay(uint ms) { uchar t; while(ms--) { for(t = 0; t < 120; t++); } } /*********************************************************/ void beep() { unsigned char i; for (i=0;i<100;i++) { delay0(4); BEEP=!BEEP; //BEEP取反 } BEEP=1; //关闭蜂鸣器 delay1(250); //延时 } //-------------------------------------------------- void delay0(uchar x) //x*0.14MS { unsigned char i; while(x--) { for (i = 0; i<13; i++) {} } } main() { P0 = 0xff; P3 = 0xff; while(1) { P0 = 0xc0; //显示“0” P3 = 0x7f; P1 = 0x0f; //置P1.0-P1.3为输入状态 _nop_(); temp = P1; while(temp==0x0f) { temp = P1; temp=temp&0x0f; } if(K1==0) { beep(); P0 = 0xf9; //显示”1“ delay(4000); } else if(K2==0) { beep(); P0 = 0xa4; //显示”2“ delay(4000); } else if(K3==0) { beep(); P0 = 0xb0; //显示“3” delay(4000); } else if(K4==0) { beep(); P0 = 0x99; //显示“4” delay(4000); } } } /*********************************************************/