51实验11:矩阵键盘16个按键分别代表0-9,a-f,用最后一位数码管显示
#include<reg52.h>
#include<intrins.h>
typedef unsigned int u16;
typedef unsigned char u8;
#define GPIO_DIG P0
#define GPIO_KEY P1
sbit LSA=P2^2;
sbit LSB=P2^3;
sbit LSC=P2^4;
u8 code smgduan[16]={0x3f,0x06,0x5b,0x4f,0x66,
0x6d,0x7d,0x07,0x7f,0x6f,
0x77,0x7c,0x39,0x5e,0x79,
0x71};
u8 KeyValue;
void delay(u16 i)
{
while(i--);
}
void KeyDown()
{
char a=0;
GPIO_KEY=0x0f;
if(GPIO_KEY!=0x0f)
{
switch(GPIO_KEY)
{
case(0x07):KeyValue=0;break;
case(0x0b):KeyValue=1;break;
case(0x0d):KeyValue=2;break;
case(0x0e):KeyValue=3;break;
}
GPIO_KEY=0xf0;
switch(GPIO_KEY)
{
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)&&(GPIO_KEY!=0xf0))
{
delay(1000);
a++;
}
}
}
void main()
{
while(1)
{
KeyDown();
LSA=0;LSB=0;LSC=0;
GPIO_DIG=smgduan[KeyValue];
}
}