三、 功能说明
此实验实现的功能是当第n号按键被按下时，连接在P3的显示器显示n，同时连接在P0，P2上的灯会从第0个开始，逐一亮到第n个。实现了矩阵按键与显示的功能。
四、 实验代码
#include<reg51.h>
#define uchar unsigned char #define uint unsigned int uchar key;
unsigned char code
key_code[]={0xee,0xde,0xbe,0x7e,0xed,0xdd,0xbd,0x7d,0xeb,0xdb,0xbb,0x7b,0xe7,0xd7,0xb7,0x77}; uchar
tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
uchar led[]={0xff,0xfe,0xfc,0xf8,0xf0,0xe0,0xc0,0x80,0x00}; void delayms(uint ms) {
uchar t; while(ms--) {
for(t=0;t<120;t++); } }
uchar i;
void k(uchar n) {
P3=tab[n]; if(n>=8) {
for(i=0;i<=8;i++) {
P0=led[i];P2=0xff;delayms(100);} for(i=0;i<n-7;i++) {
P2=led[i]; P0=0x00; delayms(100); } } else {
for(i=0;i<=n;i++) {