Create a new project based on the RTOS SDK example titled "gpio". This example is setup to use 4 pins, 2 inputs, and 2 outputs. Adjust the example, using appropriate coding standards, so that:
(a) Only a single input and a single output are specified, and the input and output pins selected are consistent with available pins on the ESP-01S
(b) A single handler is installed and used for the input on the falling edge.

#include
	#include
	#include
	#include "freertos/FreeRTOS.h"
	#include "freertos/task.h"
	#include "freertos/queue.h"
	#include "driver/gpio.h"
	#include "esp_log.h"
	#include "esp_system.h"
	static const char *TAG = "main";
	/**
	* Brief:
	* This test code shows how to configure gpio and how to use gpio interrupt.
	*
	* GPIO status:
	* GPIO15: output
	* GPIO16: output
	* GPIO4:  input, pulled up, interrupt from the rising edge and falling edge
	* GPIO5:  input, pulled up, interrupt from the rising edge.
	*
	* Test:
	* Connect GPIO15 with GPIO4
	* Connect GPIO16 with GPIO5
	* Generate pulses on GPIO15/16, that triggers interrupt on GPIO4/5
	*
	*/
	#define GPIO_OUTPUT_IO_0    15
	#define GPIO_OUTPUT_IO_1    16
	#define GPIO_OUTPUT_PIN_SEL  ((1ULL<
	#define GPIO_INPUT_IO_0     4
	#define GPIO_INPUT_IO_1     5
	#define GPIO_INPUT_PIN_SEL  ((1ULL<
	static xQueueHandle gpio_evt_queue = NULL;
	static void gpio_isr_handler(void *arg)
	{
	uint32_t gpio_num = (uint32_t) arg;
	xQueueSendFromISR(gpio_evt_queue, &gpio_num, NULL);
	}
	static void gpio_task_example(void *arg)
	{
	uint32_t io_num;
	for (;;) {
	if (xQueueReceive(gpio_evt_queue, &io_num, portMAX_DELAY)) {
	ESP_LOGI(TAG, "GPIO[%d] intr, val: %d", io_num, gpio_get_level(io_num));
	}
	}
	}
	void app_main(void)
	{
	gpio_config_t io_conf;
	//disable interrupt
	io_conf.intr_type = GPIO_INTR_DISABLE;
	//set as output mode
	io_conf.mode = GPIO_MODE_OUTPUT;
	//bit mask of the pins that you want to set,e.g.GPIO15/16
	io_conf.pin_bit_mask = GPIO_OUTPUT_PIN_SEL;
	//disable pull-down mode
	io_conf.pull_down_en = 0;
	//disable pull-up mode
	io_conf.pull_up_en = 0;
	//configure GPIO with the given settings
	gpio_config(&io_conf);
	//interrupt of rising edge
	io_conf.intr_type = GPIO_INTR_POSEDGE;
	//bit mask of the pins, use GPIO4/5 here
	io_conf.pin_bit_mask = GPIO_INPUT_PIN_SEL;
	//set as input mode
	io_conf.mode = GPIO_MODE_INPUT;
	//enable pull-up mode
	io_conf.pull_up_en = 1;
	gpio_config(&io_conf);
	//change gpio intrrupt type for one pin
	gpio_set_intr_type(GPIO_INPUT_IO_0, GPIO_INTR_ANYEDGE);
	//create a queue to handle gpio event from isr
	gpio_evt_queue = xQueueCreate(10, sizeof(uint32_t));
	//start gpio task
	xTaskCreate(gpio_task_example, "gpio_task_example", 2048, NULL, 10, NULL);
	//install gpio isr service
	gpio_install_isr_service(0);
	//hook isr handler for specific gpio pin
	gpio_isr_handler_add(GPIO_INPUT_IO_0, gpio_isr_handler, (void *) GPIO_INPUT_IO_0);
	//hook isr handler for specific gpio pin
	gpio_isr_handler_add(GPIO_INPUT_IO_1, gpio_isr_handler, (void *) GPIO_INPUT_IO_1);
	//remove isr handler for gpio number.
	gpio_isr_handler_remove(GPIO_INPUT_IO_0);
	//hook isr handler for specific gpio pin again
	gpio_isr_handler_add(GPIO_INPUT_IO_0, gpio_isr_handler, (void *) GPIO_INPUT_IO_0);
	int cnt = 0;
	while (1) {
	ESP_LOGI(TAG, "cnt: %d", cnt++);
	vTaskDelay(1000 / portTICK_RATE_MS);
	gpio_set_level(GPIO_OUTPUT_IO_0, cnt % 2);
	gpio_set_level(GPIO_OUTPUT_IO_1, cnt % 2);
	}
	}