ir_remote.c

//https://github.com/mswietlicki/Lirc_remotes/blob/master/benq.config

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/rmt.h"
#include "driver/gpio.h"
#include "esp_system.h"
#include "esp_log.h"


#define RMT_IO              (GPIO_NUM_18)
#define ON_OFF_CONTROL      (GPIO_NUM_19)
#define PIN_INDICATOR       (GPIO_NUM_5)

static const char* TAG = "ir_transmitter";

#define ZERO_BIT {{{ 604, 1, 511, 0 }}}
#define ONE_BIT  {{{ 604, 1, 1622, 0 }}}
#define RMT_END  {{{ 0, 1, 0, 0 }}}

#define PACKET_HEADER  {{{ 9077, 1, 4504, 0 }}}
#define PACKET_TAIL  {{{ 604, 1, 108167, 0 }}}
#define PACKET_ZERO_NIBBLE  ZERO_BIT,ZERO_BIT,ZERO_BIT,ZERO_BIT

//0x000CF20D
static const rmt_item32_t on_key[] = {
    PACKET_HEADER,
    PACKET_ZERO_NIBBLE,
    PACKET_ZERO_NIBBLE,
    PACKET_ZERO_NIBBLE,
    //C
    ONE_BIT,
    ONE_BIT,
    ZERO_BIT,
    ZERO_BIT,
    //F
    ONE_BIT,
    ONE_BIT,
    ONE_BIT,
    ONE_BIT,
    //2
    ZERO_BIT,
    ZERO_BIT,
    ONE_BIT,
    ZERO_BIT,
    //0
    PACKET_ZERO_NIBBLE,
    //D
    ONE_BIT,
    ONE_BIT,
    ZERO_BIT,
    ONE_BIT,
    //End
    PACKET_TAIL,
    RMT_END
};

static const rmt_item32_t tail_key[] = {
    {{{ 9000, 1, 2273, 0 }}},
    {{{ 538, 1, 2254, 0 }}},
    RMT_END
};


//0x000C728D
static const rmt_item32_t off_key[] = {
    PACKET_HEADER,
    PACKET_ZERO_NIBBLE,
    PACKET_ZERO_NIBBLE,
    PACKET_ZERO_NIBBLE,
    //C
    ONE_BIT,
    ONE_BIT,
    ZERO_BIT,
    ZERO_BIT,
    //7
    ZERO_BIT,
    ONE_BIT,
    ONE_BIT,
    ONE_BIT,
    //2
    ZERO_BIT,
    ZERO_BIT,
    ONE_BIT,
    ZERO_BIT,
    //0
    PACKET_ZERO_NIBBLE,
    //D
    ONE_BIT,
    ONE_BIT,
    ZERO_BIT,
    ONE_BIT,
    //End
    PACKET_TAIL,
    RMT_END
};

static void send_on()
{
        ESP_ERROR_CHECK(rmt_write_items(RMT_CHANNEL_0, on_key, sizeof(on_key) / sizeof(on_key[0]), true));
        vTaskDelay(44/portTICK_RATE_MS);
        ESP_ERROR_CHECK(rmt_write_items(RMT_CHANNEL_0, tail_key, sizeof(tail_key) / sizeof(tail_key[0]), true));
}

static void send_off()
{
        //Off needs to be pressed twice
        ESP_ERROR_CHECK(rmt_write_items(RMT_CHANNEL_0, off_key, sizeof(off_key) / sizeof(off_key[0]), true));
        vTaskDelay(2000/portTICK_RATE_MS);
        ESP_ERROR_CHECK(rmt_write_items(RMT_CHANNEL_0, off_key, sizeof(off_key) / sizeof(off_key[0]), true));
}

void app_main(void)
{
    rmt_config_t config = RMT_DEFAULT_CONFIG_TX(RMT_IO, RMT_CHANNEL_0);
    // set count to 1us
    config.clk_div = 80;
    config.tx_config.carrier_en = true;
    config.tx_config.carrier_freq_hz = 38000;
    config.tx_config.carrier_duty_percent = 35;


    ESP_ERROR_CHECK(rmt_config(&config));
    ESP_ERROR_CHECK(rmt_driver_install(config.channel, 0, 0));


    gpio_set_direction(ON_OFF_CONTROL, GPIO_MODE_INPUT);
    gpio_set_pull_mode(ON_OFF_CONTROL, GPIO_PULLUP_ONLY);
    gpio_set_direction(PIN_INDICATOR, GPIO_MODE_OUTPUT);
    while (1) {
        gpio_set_level(PIN_INDICATOR, 1);
        if (gpio_get_level(ON_OFF_CONTROL) == 1) {
            send_on();
        } else {
            send_off();
        }
        
        vTaskDelay(1);
        gpio_set_level(PIN_INDICATOR, 0);
        vTaskDelay(2000/portTICK_RATE_MS);

    }
}