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https://github.com/jrcutler/Tiny_IR_Repeater
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Initial functional implementation
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main.c
82
main.c
@ -4,13 +4,89 @@
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* License: GPL
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*/
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#include <avr/sleep.h>
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/* IR modulation frequency (in Hz) */
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#define IR_MODULATION 38000
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/* IR receive pin (demodulated, negative logic) */
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#define IR_RX PINB0
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/* IR transmit pin */
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#define IR_TX PINB1
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/* enable modulated IR transmit (via Timer1) */
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#define IR_TX_ON() do { TCCR1 |= _BV(COM1A1); } while (0)
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/* disable modulated IR transmit (via Timer1) */
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#define IR_TX_OFF() do { TCCR1 &= ~_BV(COM1A1); } while (0)
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/* IR receiver pin change interrupt */
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ISR(PCINT0_vect)
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{
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/* test IR_RX pin (negative logic) */
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if (PINB & _BV(IR_RX))
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{
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IR_TX_OFF();
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}
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else
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{
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IR_TX_ON();
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}
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}
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void setup(void)
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{
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/*
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* IR receiver setup
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*/
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/* set IR_RX as input */
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DDRB &= _BV(IR_RX);
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/* enable interrupt on change of IR_RX */
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PCMSK |= _BV(PCINT0);
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GIMSK |= _BV(PCIE);
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/*
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* IR transmitter setup
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*/
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/* enable IR modulation (50% duty cycle) via Timer1 */
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TCCR1 = _BV(PWM1A) | _BV(CS12);
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OCR1C = (((F_CPU / 8 / IR_MODULATION)) - 1);
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OCR1A = OCR1C / 2;
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/* set IR_TX as output */
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DDRB |= _BV(IR_TX);
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/* turn IR_TX off when not enabled */
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PORTB &= ~_BV(IR_TX);
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/*
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* Power saving
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*/
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/* disable unnecessary hardware */
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PRR |= _BV(PRADC) | _BV(PRUSI);
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/* enable idle sleep mode */
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set_sleep_mode(SLEEP_MODE_IDLE);
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}
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int main(void)
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{
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/* insert your hardware initialization here */
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for(;;){
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/* insert your main loop code here */
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/* initialize hardware */
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setup();
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/* enable interrupts */
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sei();
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for (;;)
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{
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/* go to sleep (all work done in PCINT0 ISR) */
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sleep_mode();
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}
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return 0; /* never reached */
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}
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