//51單片機
//p3.5口接燈的陰極端，按鍵分別接p2.0 p2.1
#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
#define LED_ON 0
#define LED_OFF 1
sbit led = P3^5;
sbit key_up = P2^0;
sbit key_down = P2^1;
void main(void)
{
key_up = 1;
key_down = 1;
led = 1;
while(1)
{
if(key_down)
{
if(key_up)
{
led = LED_OFF;
}
else
{
led = LED_ON;
}
}
else
{
if(key_up)
{
led = LED_ON;
}
else
{
led = LED_OFF;
}
}
}
}