8路紅外遙控開關控制器
(SAA3010T電視遙控器)



#include <AT89x51.h>

static unsigned char data IRCode[3],IRCON,IRCON2;
static unsigned char data DT;

void main(void)
{
unsigned int de;

TMOD = 0x01; //定時器0方式1
EA = 1; //允許CPU中斷
IT0 = 1; //INT0下降沿有效
EX0 = 1; //開INT0中斷;
do
{ 
for (de=0; de<10000; de++)
P3_6 = 1;
for (de=0; de<10000; de++)
P3_6 = 0;
if (DT) 
{
for (de=0; de<30000; de++) //這里起到按鍵值正確后會有一個延時，防止重復按鍵
P3_6 = 1;
for (de=0; de<30000; de++)
P3_6 = 0;
DT = 0;
}
EX0 = 1;
}
while(1);
}

//定時器0中斷處理
void timeint(void) interrupt 1 using 2
{
TH0=0xFD;
TL0=0x1E; //設定時值為800us

if (IRCON<3)
{
if (IRCON2<8) //每中斷一次讀一次遙控接收頭的狀態,每二次為遙控編碼中的一個位
{
IRCON2++;
IRCode[IRCON]=IRCode[IRCON]<<1; //每讀一次放入變量中的二進制的一個位，每次左移一位
IRCode[IRCON]=IRCode[IRCON] | P3_2; //每八次填滿一個字節，一個字節存放遙控編碼4個位
}
else
{
IRCON++; //填滿一個字節，指向下一個變量
IRCON2=0; //計數清零
}
}
else
{
TR0 = 0; //關閉定時器
ET0 = 0; //定時器0中斷關閉
if ((IRCode[1]!=0xFF) && (IRCode[2]!=0xFF))
{
if (IRCode[1] == 0x55)
{
switch (IRCode[2])
{
case 0xAB: //1-8鍵控制
P1_0 = ~P1_0;
DT = 1;
break;
case 0xAC:
P1_1 = ~P1_1;
DT = 1;
break;
case 0xAD: 
P1_2 = ~P1_2;
DT = 1;
break;
case 0xB2: 
P1_3 = ~P1_3;
DT = 1;
break;
case 0xB3: 
P1_4 = ~P1_4;
DT = 1;
break;
case 0xB4: 
P1_5 = ~P1_5;
DT = 1;
break;
case 0xB5: 
P1_6 = ~P1_6;
DT = 1;
break;
case 0xCA: 
P1_7 = ~P1_7;
DT = 1;
break;
case 0xD2: //按關閉電源鍵，關閉所有繼電器
P1 = 0xFF;
DT = 1;
break;
}
}
}
} 
}

//INT0中斷
void INT0Fun(void) interrupt 0 using 2
{
EX0 = 0; //外部中斷0關閉
ET0 = 1; //定時器0中斷打開
TH0=0xFD;
TL0=0x1E; //設定時值為800us

for (IRCON=0; IRCON<3; IRCON++)
IRCode[IRCON] = 0;
IRCON = 0;
IRCON2 = 0; //計數清零

TR0 = 1;//開始計數
}