键盘扫描程序

#include<reg51.h> #include<absacc.h> #define unchar unsigned char #define unit unsigned int void delays(void) { uchar i; for(i=0;i<300;i++) } uchar kbscan(void) { uchar sccode,recode; p2=0xF0; if((p2&0xF0)!=0xF0;) { delays(); if((p2&0xF0)!=0xF0) { scode=0xFE; while((sccode0x10)!=0) { p2=sccode; if((p2&0xF0)!=0xF0) { recode=(p2&0xF0)|0Xf0; return((~sccode)+(~recode)); }