// IR Remote Control for Philips TV using RC5 protocol
//--------------------------------------------------------------------
//AKENAFAB
//http://www.todopic.com.ar/foros/
//--------------------------------------------------------------------
// 14bits wide ->|START|START|TOGGLE|5BIT ADDRESS|6BIT COMMAND|<-
// 38KHz Carrier Frequency
//--------------------------------------------------------------------
#include <12F1822.h>
//--------------------------------------------------------------------
#FUSES INTRC_IO,NOCLKOUT,NOWDT,PUT,NOMCLR,BROWNOUT,BORV25,PROTECT,CPD,NOIESO,NOFCMEN,NOLVP
#use delay(clock=32M)
#use fast_io(A)
#zero_ram
//--------------------------------------------------------------------
#byte IOCAP = 0x391 //ON rising-edge interrupt
#byte IOCAN = 0x392 //ON falling-edge interrupt
#byte IOCAF = 0x393 //IOC FLAG register
#byte INTCON = 0x0B //Interrupt Control Register
//--------------------------------------------------------------------
//--------- --------------------------------------------------
#define IR_LED PIN_A2
#define ON 1
#define OFF 0
//--------------------------------------------------------------------
long pwm_duty_cycle=416; //PWM MAX = 832 , PWM DUTY SET to 50%
char button_pressed;
char new_button_pressed;
char RA_FLAG;
//--------------------------------------------------------------------
long commands[5]={ 0b11000000001100,0b11000000010000,0b11000000010001,
0b11000000100000,0b11000000100001};
char command_index;
/*
long TV_STAND_BY =0b11000000001100; // ON-OFF
long TV_VOL_UP =0b11000000010000; // Volumen +
long TV_VOL_DOWN =0b11000000010001; // Volumen -
long TV_CH_UP =0b11000000100000; // Channel +
long TV_CH_DOWN =0b11000000100001; // Channel -
*/
//--------------------------------------------------------------------
void ir_transmit(char command); // Transmits the COMMAND
void PWM_pulse(char state); // Controls the PWM output
void main(){
//-------------------------------------------------------------------
setup_comparator(NC_NC); // COMPARATOR OFF
SETUP_ADC(ADC_OFF); // ADC OFF
SETUP_ADC_PORTS(NO_ANALOGS); // NO ANALOG PINS
output_A(0x00); // OutputLatch
set_tris_A(0B111011); //
// RA0=INPUT
// RA1=INTPUT
// RA2=IR_LED OUTPUT
// RA3=INPUT
// RA4=INPUT
// RA5=INPUT
PORT_A_PULLUPS(0b111011); // Internal pull-ups resistor enabled
//--------------------------------------------------------------------
enable_interrupts(INT_RA); //Interrupt On-Change on PORT
IOCAN=0b111011; //Interrupt On-Change RA High to Low
IOCAP=0b000000;
bit_clear(INTCON,0); //Clearing IOCF flag bit
IOCAF=0; //Clearing IOC flags
enable_interrupts(GLOBAL); //Global interrupts enabled
//--------------------------------------------------------------------
//--------- MAIN PROGRAM -----------------------------\\\\
while(1){
sleep();
if(RA_FLAG==TRUE){ //If any button was pressed
RA_FLAG=FALSE; //Resefting the RA FLAG for the new incoming data detection
button_pressed=~button_pressed; //Masking buttons
button_pressed&=0b111011; //getting the pressed button
switch(button_pressed){
case 0x01: command_index=0; //Button 0
break;
case 0x02: command_index=1; //Button 1
break;
case 0x08: command_index=2; //Button 2
break;
case 0x10: command_index=3; //Button 3
break;
case 0x20: command_index=4; //Button 4
break;
}//switch button-command
ir_transmit(command_index); //Transmiting selected code
IOCAF=0; //Clearing IOC flags
bit_clear(INTCON,0); //Clearing IOCF Global flag big
bit_set(INTCON,3); //Enabling IOC interrupt
}//IF-RA FLAG
}////end while
}// main
//-------- INTERRUPTS -------------------------------------
#INT_RA
void port_change(){
IOCAF=0; //Clearing IOC flags
bit_clear(INTCON,0); //Clearing IOCF Global flag bit
bit_clear(INTCON,3); //Disabling IOC interrupt to avoid reentrance
button_pressed=input_A(); //Reading PORT
RA_FLAG=TRUE; //Botton pressed Flag
}//Interrupt On Change
//--------------------------------------------------------------------
//-------- FUNCTIONS --------------------------------------
void ir_transmit(char index){ //Transmits the IR command
char x;
char rc5_bit;
do{ //At Least once transmitted
rc5_bit=13; //MSB firts
for(x=0;x<14;x++){ //Transmiting 14 bits
if(bit_test(commands[index],rc5_bit)==1){ //Transmiting _01_
PWM_pulse(OFF);
delay_us(880);
PWM_pulse(ON);
delay_us(880);
}
else {
PWM_pulse(ON); //Transmiting _10_
delay_us(880);
PWM_pulse(OFF);
delay_us(880);
}
rc5_bit--;
}//for x address
PWM_pulse(OFF);
delay_ms(114); //Delay between same command
new_button_pressed=input_A();
new_button_pressed=~new_button_pressed;
new_button_pressed&=0b111011;
}while(new_button_pressed==button_pressed); //While the same button stays pressed
//Updating Toggle-bit
if(bit_test(commands[index],11)==0)bit_set(commands[index],11);
else bit_clear(commands[index],11);
}//ir-transmit function
//--------------------------------------------------------------------
void PWM_pulse(char state){ //Controls the PWM output
if(state==ON){
SETUP_CCP1(CCP_PWM); // PWM
SETUP_TIMER_2(T2_DIV_BY_1, 207,1); // Frequency = 38KHz -
SET_PWM1_DUTY(pwm_duty_cycle); // Duty cycle = 50% -
}
else{
SETUP_CCP1(CCP_OFF); // PWM OFF
SETUP_TIMER_2(T2_DISABLED, 207,1); // Timer2 disabled
SET_PWM1_DUTY(pwm_duty_cycle); // Duty cycle = 50% - JUST FOR MATCHING TIME
output_low(pin_A2); // Ensures the output is on LOW state
}//else
}//function PWM PULSE
//--------------------------------------------------------------------
