單片機源程序如下:
#include <REGX51.H>
#include <intrins.h>
char code led_scan[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x58,0x5e,0x79,0x71};
char keyvalue=0;
void delay(int time)
{
unsigned int j;
for(;time>0;time--)
{
for(j=0;j<125;j++)
{
}
}
}
void key()
{
void delay(int time);
char a=0;
while(1)
{
P2=0xf0;//2aêÔDD
if(P2!=0xf0)
{
delay(1000);
if(P2!=0xf0)
{
switch(P2)
{
case(0x70):keyvalue=keyvalue;break;
case(0xb0):keyvalue=keyvalue+4;break;
case(0xd0):keyvalue=keyvalue+8;break;
case(0xe0):keyvalue=keyvalue+12;break;
}
}
}
P2=0x0f;
if(P2!=0x0f)
{
delay(1000);
if(P2!=0x0f)
{
switch(P2)
{
case(0x07):keyvalue=0;break;
case(0x0b):keyvalue=1;break;
case(0x0d):keyvalue=2;break;
case(0x0e):keyvalue=3;break;
}
}
}
while((a<50)&&(P2=0X0F)
{
delay(1000);
a++;
}
}
}
void main()
{
while(1)
{
key();
P0=led_scan[keyvalue];
}
}
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