#include "driver/ledc.h"
#include "pins.h"

#define LEDC_TIMER      LEDC_TIMER_0
#define LEDC_MODE       LEDC_LOW_SPEED_MODE
#define LEDC_CHANNEL    LEDC_CHANNEL_0
#define LEDC_DUTY_RES   LEDC_TIMER_8_BIT

void ir_pwm_init() {
    ledc_timer_config_t timer = {
        .speed_mode = LEDC_MODE,
        .timer_num = LEDC_TIMER,
        .duty_resolution = LEDC_DUTY_RES,
        .freq_hz = 38000,
        .clk_cfg = LEDC_AUTO_CLK
    };
    ledc_timer_config(&timer);

    ledc_channel_config_t channel = {
        .speed_mode = LEDC_MODE,
        .channel = LEDC_CHANNEL,
        .timer_sel = LEDC_TIMER,
        .gpio_num = IR_LED,
        .duty = 0,
        .hpoint = 0
    };
    ledc_channel_config(&channel);
}

void ir_carrier_on() {
    // ~50% duty cycle (strong IR signal)
    ledc_set_duty(LEDC_MODE, LEDC_CHANNEL, 128);
    ledc_update_duty(LEDC_MODE, LEDC_CHANNEL);
}

void ir_carrier_off() {
    ledc_set_duty(LEDC_MODE, LEDC_CHANNEL, 0);
    ledc_update_duty(LEDC_MODE, LEDC_CHANNEL);
}