键盘扫描控制数码管显示程序

#include<reg51.h> #define uint unsigned int #define uchar unsigned char uchar code table[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0xff}; uchar num,temp,num1; void delay(uint z) { uint x,y; for(x=z;x>0;x--) for(y=110;y>0;y--); } uchar keyscan(); void main() { num=17; P2=0x0a; //P0=0xff; while(1) { num1=keyscan(); P0=table[num1-1]; } } /*void display(uchar aa) { P0=table[aa-1]; }*/ uchar keyscan() { P3=0x7f; temp=P3; temp=temp&0x0f; while(temp!=0x0f) { delay(5); temp=P3; temp=temp&0x0f; while(temp!=0x0f) { temp=P3; switch(temp) { case 0x77:num=4; break; case 0x7b:num=8; break; } while(temp!=0x0f) { temp=P3; temp=temp&0x0f; } } } P3=0xbf; temp=P3; temp=temp&0x0f; while(temp!=0x0f) { delay(5); temp=P3; temp=temp&0x0f; while(temp!=0x0f) { temp=P3; switch(temp) { case 0xb7:num=3; break; case 0xbb:num=7; break; } while(temp!=0x0f) { temp=P3; temp=temp&0x0f; } } } P3=0xdf; temp=P3; temp=temp&0x0f; while(temp!=0x0f) { delay(5); temp=P3; temp=temp&0x0f; while(temp!=0x0f) { temp=P3; switch(temp) { case 0xd7:num=2; break; case 0xdb:num=6; break; } while(temp!=0x0f) { temp=P3; temp=temp&0x0f; } } } P3=0xef; temp=P3; temp=temp&0x0f; while(temp!=0x0f)//修改了的地方******************************************************* { delay(5); temp=P3; temp=temp&0x0f; while(temp!=0x0f) { temp=P3; switch(temp) { case 0xe7:num=1; break; case 0xeb:num=5; break; } while(temp!=0x0f) { temp=P3; temp=temp&0x0f; } } } return num; }