51单片机矩阵键盘与左右流水灯控制C程序
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//第二次矩阵按键检测
P3 = 0xfd; //给P3口赋初值，使得矩阵按键的第二行置0，其余行为高电平；
temp = P3;//将用于检测的值赋给变量temp
temp &= 0xf0;
if(temp != 0xf0)
{
delay(5);//消抖
//重新装入待于检测的初值；
temp = P3;
temp &= 0xf0;
if(temp != 0xf0)
{
//确定矩阵按键有键被按下
//将此时的P3口的值赋给temp
FM = 0;
temp = P3;
//开始检测
switch(temp)
{
case 0xed: key1 = 5 * 5;
break;
case 0xdd: key1 = 6 * 6;
break;
case 0xbd: key1 = 7 * 7;
break;
case 0x7d: key1 = 8 * 8;
break;
default:
break;
}
//检测按下释放
while(temp != 0xf0)
{
//重新装入初值
temp = P3;
temp &= 0xf0;
}
delay(5);//释放去抖
while(temp != 0xf0)
{
//重新装入初值
temp = P3;
temp &= 0xf0;
}
//按键释放关闭蜂鸣器
FM = 1;
}
}
//第三次矩阵按键检测
P3 = 0xfb;
temp = P3;
temp &= 0xf0;
if(temp != 0xf0)
{
delay(5);//消抖
//重新装入检测初值
temp = P3;
temp &= 0xf0;
if(temp != 0xf0)
{
//将此时P3口的值赋给temp
temp = P3;
FM = 0;//蜂鸣器发声
//检测按下的是哪一个按键，行列检测
switch(temp)
{
case 0xeb: key1 = 9 * 9;
break;
case 0xdb: key1 = 10 * 10;
break;
case 0xbb: key1 = 11 * 11;
break;
case 0x7b: key1 = 12 * 12;
break;
default:
break;
}
//检测按键释放
while(temp != 0xf0)
{
temp = P3;
temp &= 0xf0;
}
delay(5);
while(temp != 0xf0)
{
temp = P3;
temp &= 0xf0;
}
//按键释放关闭蜂鸣器
FM = 1;
}
}
//第四次检测矩阵按键
P3 = 0xf7;//第四行为低电平，其余行为高电平；
temp = P3;//将待检测的值赋给temp；
temp &= 0xf0;
if(temp != 0xf0)
{
delay(5); //消抖
//重新装入检测初值
temp = P3;
temp &= 0xf0;
if(temp != 0xf0)
{
//确认有按键按下
//将此时的P3口的实际值赋给temp；
temp = P3;
FM = 0;
//开始检测
switch(temp)
{
case 0xe7: key1 = 13 * 13;
break;
case 0xd7: key1 = 14 * 14;
break;
case 0xb7: key1 = 15 * 15;
break;
case 0x77: key1 = 16 * 16;
break;
default:
break;
}
//检测按键释放
while(temp != 0xf0)
{ //重新装入初值
temp = P3;
temp &= 0xf0;
}
delay(5);
while(temp != 0xf0)
{
temp = P3;
temp &= 0xf0;
}
//关闭蜂鸣器
FM = 1;
}
}
}
//定时器0中断服务子程序
void int_time0() interrupt 1
{
TH0 = 0xB8;
TL0 = 0X00;
counter++;
if(flag== 0)
{ //流水灯左移流动
if(counter % 1 == 0)
{
P1 = ~(1 << x++);
if(x == 8)
{
x = 0;
}
}
}
else
{ //流水灯右移流动
if(counter % 1 == 0)
{
P1 = ~(0x80 >> x++);
if(x == 8)
{
x = 0;
}
}
}
}本文引用地址：https://www.eepw.com.cn/article/201612/324623.htm
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