C语言初学者基础练习代码.zip_c语言练习代码_基础教程_流水灯

//4*4键盘检测程序,按下键后相应的代码显示在数码管上 #include<reg51.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;j>0;j--) for(k=125;k>0;k--); } unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; display(unsigned char num) { P0=table[num]; // P0=0xff; dula=1; dula=0; P0=0xc0; wela=1; wela=0; } void main() { dula=0; wela=0; while(1) { P3=0xfe; temp=P3; temp=temp&0xf0; if(temp!=0xf0) { delay(10); if(temp!=0xf0) { temp=P3; switch(temp) { case 0xee: key=0; break; case 0xde: key=1; break; case 0xbe: key=2; break; case 0x7e: key=3; break; } while(temp!=0xf0) { temp=P3; temp=temp&0xf0; beep=0; } beep=1; display(key); // P0=table[key]; /* P0=0xff; dula=1; while(i--); dula=0; P0=0xc0; wela=1; wela=0; dula=0; wela=0; P0=0xff; dula=1; dula=0; P0=0xc5; wela=1; wela=0; */ P1=0xfe; } } P3=0xfd; temp=P3; temp=temp&0xf0; if(temp!=0xf0) { delay(10); if(temp!=0xf0) { temp=P3; switch(temp) { case 0xed: key=4; break; case 0xdd: key=5; break; case 0xbd: key=6; break; case 0x7d: key=7; break; } while(temp!=0xf0) { temp=P3; temp=temp&0xf0; beep=0; } beep=1; display(key); /* P0=table[key]; dula=1; // while(100--); dula=0; P0=0xc0; wela=1; wela=0; */ P1=0xfc; } } P3=0xfb; temp=P3; temp=temp&0xf0; if(temp!=0xf0) { delay(10); if(temp!=0xf0) { temp=P3; switch(temp) { case 0xeb: key=8; break; case 0xdb: key=9; break; case 0xbb: key=10; break; case 0x7b: key=11; break; } while(temp!=0xf0) { temp=P3; temp=temp&0xf0; beep=0; } beep=1; display(key); /* P0=table[key]; dula=1; // while(100--); dula=0; P0=0xc0; wela=1; wela=0; */ P1=0xf8; } } P3=0xf7; temp=P3; temp=temp&0xf0; if(temp!=0xf0) { delay(10); if(temp!=0xf0) { temp=P3; switch(temp) { case 0xe7: key=12; break; case 0xd7: key=13; break; case 0xb7: key=14; break; case 0x77: key=15; break; } while(temp!=0xf0) { temp=P3; temp=temp&0xf0; beep=0; } beep=1; display(key); /* P0=table[key]; dula=1; // while(100--); dula=0; P0=0xc0; wela=1; wela=0; */ P1=0xf0; } } } }