代码： #include<reg51.h> char led_mod[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,0x58,0x5e,0x79,0x71}; //显示字模
char key_buf[]={0xee,0xde,0xbe,0x7e,0xed,0xdd,0xbd,0x7d,
0xeb,0xdb,0xbb,0x7b,0xe7,0xd7,0xb7,0x77}; //键模
char getkey(void){
char key_scan[]={0xef,0xdf,0xbf,0x7f}; //键扫描码
char i=1,j=0;
for(i=0;i<4;i++){
P2=key_scan[i] ; //P2送出键扫描码
if((P2&0x0f)!=0x0f){ //判断有无键按下
for(j=0;j<16;j++){
if(key_buf[j]==P2) return j; //查找按键键键值
}
}
}
return-1;
}
void main(void){
char key=0;
P0=0x00; //显示黑屏
while(1){
key=getkey(); //获取键值
if (key!=-1) P0=led_mod[key]; //显示键值
}}
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