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給個(gè)參考：
void Getch ( ) //取鍵值函數(shù)
{
unsigned char X,Y,Z;
P0=0x0f; //先對(duì)P0 置數(shù) 行掃描
if(P0!=0x0f) //判斷是否有鍵按下
{
delay10ms(); //延時(shí),軟件去干擾
if(P0!=0x0f) //確認(rèn)按鍵按下
{
X=P0; //保存行掃描時(shí)有鍵按下時(shí)狀態(tài)
P0=0xf0; //列掃描
Y=P0; //保存列掃描時(shí)有鍵按下時(shí)狀態(tài)
Z=X|Y; //取出鍵值
switch ( Z ) //判斷鍵值（那一個(gè)鍵按下）
{
case 0xee: k=0; break; //對(duì)鍵值賦值
case 0xed: k=1; break;
case 0xeb: k=2; break;
case 0xe7: k=3; break;
case 0xde: k=4; break;
case 0xdd: k=5; break;
case 0xdb: k=6; break;
case 0xd7: k=7; break;
case 0xbe: k=8; break;
case 0xbd: k=9; break;
case 0xbb: k=10;break;
case 0xb7: k=11;break;
case 0x7e: k=12;break;
case 0x7d: k=13;break;
case 0x7b: k=14;break;
case 0x77: k=15;break;
}
}
}
} |
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