矩阵键盘扫描程序
uchar getkey(void) //扫描取键值程序
{
uchar rcode,ccode;
P3=0xf0;
if((P3&0xf0)!=0xf0)
{
delayms(20); //为消除抖动,延时20ms
if((P3&0xf0)!=0xf0)
{
rcode=0xfe; //开始发行扫描信号
while((rcode&0x10)!=0)
{
P3=rcode;
if(
相关下载链接:
//download.csdn.net/download/zhaozaiyou/1701170?utm_source=bbsseo