#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "esp_rom_sys.h"

int SQUARE_WAVE_GPIO = 25;
#define WAVE_FREQ_HZ     10

void app_main(void)
{
    gpio_config_t io_conf = {
        .pin_bit_mask = 1ULL << SQUARE_WAVE_GPIO,
        .mode = GPIO_MODE_OUTPUT,
        .pull_up_en = GPIO_PULLUP_DISABLE,
        .pull_down_en = GPIO_PULLDOWN_DISABLE,
        .intr_type = GPIO_INTR_DISABLE
    };
    gpio_config(&io_conf);

    int delay_us = 1000000 / (WAVE_FREQ_HZ * 2);  // Half-period in µs

    while (1) {
        gpio_set_level(SQUARE_WAVE_GPIO, 1);
        esp_rom_delay_us(delay_us);

        gpio_set_level(SQUARE_WAVE_GPIO, 0);
        esp_rom_delay_us(delay_us);
    }
}