Infrared remote control microcontroller coding program plus detailed explanation-EEWORLD

Collect

void IR_IN() interrupt 0 using 0 //Using 12MHz crystal

{

unsigned char j,k,N=0;

EX0 = 0; // Initialize, turn off external interrupt

delay(15);

if (IRIN==1) //no pulse arrives high level

{ EX0 =1; //Enable interrupt in default state, look for 9ms boot pulse

return;

}

//Confirm that the IR signal appears

while (!IRIN) //Wait for IR to become high level and skip the 9ms leading low level signal.

{delay(1);} //The MCU receiving level is completely opposite to the remote control level, delay(1) delay 0.14ms

for (j=0;j<4;j++) //Collect four sets of data

{

for (k=0;k<8;k++) //Each set of data has 8 bits

{

while (IRIN) //Wait for IR to become low level and skip the 4.5ms leading high level signal.

{delay(1);}

while (!IRIN) //Wait for IR to become high level (0.56ms)

{delay(1);}

while (IRIN) //Calculate the duration of IR high level

{

delay(1);

N++;

if (N>=14) //Greater than 1.685ms high level length, in order to ensure reliability N=14

{ EX0=1; //(2.25/0.14=16,1.685/0.14=12,0.565/0.14=4)

return;} //0.14ms count is too long, automatically exit, re-judge.

} //High level counting completed

IRCOM[j]=IRCOM[j] >> 1; //Fill the highest bit of data with "0"

if (N>=6) {IRCOM[j] = IRCOM[j] | 0x80;} //High level length greater than 0.565ms, N=6, 7, 8 (1.685/2) are all OK, judged as "1", the highest bit of the data is filled with "1"

N=0;

}//end for k

}//end for j

if (IRCOM[2]!=~IRCOM[3]) The data code is opposite to the data inverse code, continue to execute, otherwise, the data is wrong. Return and re-judge.

{ EX0=1;

return; }

IRCOM[5]=IRCOM[2] & 0x0F; //Get the lower four bits of the key code

IRCOM[6]=IRCOM[2] >> 4; // Shift right 4 times, the upper four bits become the lower four bits

if(IRCOM[5]>9)

{ IRCOM[5]=IRCOM[5]+0x37;} //Convert to the corresponding ASCII code and send to 1602 for display.

else

IRCOM[5]=IRCOM[5]+0x30;

if(IRCOM[6]>9)

{ IRCOM[6]=IRCOM[6]+0x37;}

else

IRCOM[6]=IRCOM[6]+0x30;

lcd_pos(0x4b);

lcd_wdat(IRCOM[6]); //First digit display

lcd_pos(0x4c);

lcd_wdat(IRCOM[5]); //The second digit is displayed

beep();

EX0 = 1; //Open interrupt and continue judging

}

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