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7、多路开关状态指示 #includereg51.h sbit s2=P3^4; sbit s3=P3^5; sbit s4=P3^6; sbit s5=P3^7; sbit led1=P1^0; sbit led2=P1^1; sbit led3=P1^2; sbit led4=P1^3; void main() { while(1) { if(s2==0) led1=0; else led1=1; if(s3==0) led2=0; else led2=1; if(s4==0) led3=0; else led3=1; if(s5==0) led4=0; else led4=1; } } 8、流水灯1 #includereg52.h #includeintrins.h void delay(unsigned char i) { unsigned char m,n; for(m=i;m0;m--) for(n=125;n0;n--); } void main() { unsigned char k; while(1) { P1=0xfe; for(k=0;k8;k++) { delay(2000); P1=_crol_(P1,1); } } } 9、流水灯2 #includereg52.h void delay(unsigned char i) { unsigned char m,n; for(m=i;m0;m--) for(n=125;n0;n--); } void main() { while(1) { P1=0x7e; delay(2000); P1=0xbd; delay(2000); P1=0xdb; delay(2000); P1=0xe7; delay(2000); P1=0xdb; delay(2000); P1=0xbd; delay(2000); P1=0x7e; delay(2000); } } 10流水灯3 #includereg51.h void delay(unsigned char i) { unsigned char m,n; for(m=i;m0;m--) for(n=125;n0;n--); } void main() { unsigned char m=255; while(1) { P1=m; delay(2000); m--; } } 11、独立按键操作 #includereg51.h sbit k1=P3^4; sbit led=P1^0; void main() { while(1) //通过大循环不断扫描按键状态 { if(k1==0) led=0; else led=1; } } 12、多功能按键识别 #includereg52.h #define uchar unsigned char uchar num; sbit beep=P2^3; sbit led=P1^0; sbit k1=P3^4; void delay(uchar i) { uchar j,k; for(j=i;j0;j--) for(k=125;k0;k--); } void main() { while(1) { if(k1==0) { delay(20); //消抖 if(k1==20) { while(!k1); //等待按键松开 num++; } switch(num) { case 1: led=0; beep=1; break; case 2: beep=0; led=1; num=0; break; } } } } 15、矩阵键盘扫描 #includereg51.h sbit beep=P2^3; sbit dula=P2^6; sbit wela=P2^7; unsigned char i=100; unsigned char j,k,temp,key; void delay(unsigned char i) { for(j=i;j0;j--) for(k=125;k0;k--); } unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; displa