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mạch PCB (vẽ hơi xấu)
mạch PCB (vẽ hơi xấu)
Code:
#include <regx51.h>
//su dung thach anh 12mhz
//Ngo Hung Cuong
//kidteam@gmail.com
//0989696971 - 0915696971
#define signal P3_2
#define led P2_7
unsigned char newkey;
//============================================
void delay(void);//chuong trinh con delay 750
void EX0_ISR(void);
void init(void);//chuong trinh con khoi tao
//============================================
void main(void)
{
init();
//TMOD=1;
while(1)
{
//if(!signal)
//EX0_ISR();
}
}
//cac chuong trinh con duoc cai dat o day
//============================================
void delay(void)
{
//su dung timer 0 luon
TH0=0xfd;//-740
TL0=0x1c;//-740
TR0=1;
while(!TF0);
TR0=0;
TF0=0;
//tre khoang 750us
}
//============================================
void init(void)
{
//khoi tao cho timer va ngat ngoai
//cac che do can thiet
TMOD=1;//timer 0 che do 1
EX0=1;
IT0=1;
EA=1;
}
//============================================
void EX0_ISR(void) interrupt 0
{
unsigned char i,j;
unsigned char cmd;
cmd=0;
for(i=0;i<3;++i)
{
//kiem tra xem co phai la nhieu hay khong
delay();
if(signal)
return;
}
//doi tiep cho tin hieu len cao
while(!signal);
//sau 3 lan delay ma van o muc thap chung to khong phai la nhieu
//bat dau thu tin hieu thoi nao
//thong nhat la chi thu 7 bit ma lenh thoi
//khong thu 5 bit dia chi
//cho cho tin hieu len cao
//phai cho vao vong lap
//tin hieu dang o muc cao
for(i=0;i<7;++i)
{
cmd>>=1;
while(signal);
delay();
//kiem tra bit
if(!signal)//bit 0
{
//bit 1
cmd|=0x80;
while(!signal);
}
}
cmd>>=1;
if(cmd==21)
led=!led;
for(i=0;i<100;++i)
for(j=0;j<10;++j)
delay();
}
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