独立按键控制LED
#include <reg52.h>
sbit led=P2^0;
sbit k1=P3^1;
void delay(int i)
{
while(i--);
}
void keypros()
{
if(k1==0)
{
delay(1000);
if(k1==0)
led=~led;
while(!k1);
}
}
void main()
{
while(1){
keypros();
}
}
矩阵按键
#include<reg51.h>
#include<instrins.h>
typedef unsigned char u8;
typedef unsigned int u16;
sbit LSA=P2^2;
sbit LSB=P2^3;
sbit LSC=P2^4;
#define GPIO_KEY P1
#define GPIO_DIG P0
u8 code smgduan[]={ 0x3f , 0x06 , 0x5b , 0x4f , 0x66 , 0x6d,
0x7d , 0x07 , 0x7f , 0x6f , 0x77 , 0x7c,
0x39 , 0x5e , 0x79 , 0x71 , 0x00};
void delay(int i)
{
while(i--);
}
u8 KeyValue;
void KeyDown()
{
u8 a;
P1=0x0f;
if(P1!=0x0f){
delay(1000);
if(P1!=0x0f)
{
P1=0x0f;
switch(P1)
{
case(0x07): KeyValue=0;break;
case(0x0b): KeyValue=1;break;
case(0x0d): KeyValue=2;break;
case(0x0e): KeyValue=3;break;
}
P1=0xf0;
switch(P1)
{
case(0x70): KeyValue=KeyValue;break;
case(0xb0): KeyValue=KeyValue+4;break;
case(0xd0): KeyValue=KeyValue+8;break;
case(0xe0): KeyValue=KeyValue+12;break;
}
//while((a<50) && (P1!=0xf0))
//{
//delay(1000);
//a++;
//}
}
}
}
int main()
{
int i;
LSA=0;
LSB=0;
LSC=0;
while(1){
KeyDown();
P0=smgduan[KeyValue];
}
}
马踏飞燕&lin_li
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