#include <reg52.h>
#define TRUE 1
/********************************************
晶振：12MHZ
KEY : P1.0
********************************************/
//typedef unsigned char uchar;
//typedef unsigned int uint;
sbit IO = P1^0;
sbit K = P1^1;
uchar state = 10;
uchar on_time = 0;
uchar off_time = 0;
bit key_flag = 0;
uchar onoff = 0;
void Timer0_init(void)
{
TMOD = 0X01;
ET0 = 1;
EA = 1;
TR0 = 1;
}
uchar Key_scan(void)
{
static uchar old_key = 0;
static uchar new_key = 0;
static uchar key_buf = 0;
uchar key = 0;
new_key = (uchar)K;
if(new_key == old_key)
{
if(new_key != 0)
{
key_buf = 1;
}
}
else
{
if(key_buf)
{
key = TRUE;
key_buf = 0;
}
}
old_key = new_key ;
return key;
}
void main(void)
{
Timer0_init();
while(1)
{
if(key_flag)
{
key_flag = 0;
if(Key_scan() == 1)
{
state ++;
if(state == 4 || state == 11)state = 0;
switch(state)
{
case 0:on_time = 7; off_time = 7; break;
case 1:on_time = 3; off_time = 3; break;
case 2:on_time = 20;off_time = 80;break;
case 3:break;
default:break;
}
}
}
}
}
void Timer0_isovf(void)interrupt 1
{
static uchar cnt = 0;
static bit flag = 0;
TH0 = 0X3c; //50ms
TL0 = 0xb0;
key_flag = 1;
if(state == 3)
{
IO = 1;
cnt = 0;
}
if(cnt >= onoff && state < 10)
{
cnt = 0;
if(flag)
{
flag = 0;
onoff = off_time;
IO = 0;
}
else
{
flag = 1;
onoff = on_time;
IO = 1;
}
}
cnt ++;
}