#include <stdio.h>
#include "driver/uart.h"
#include "driver/gpio.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"  // Include the ESP-IDF logging system
#define UART_NUM UART_NUM_2  // Use UART2
#define TXD_PIN 17           // UART TX pin
#define RXD_PIN 16           // UART RX pin
#define LED_PIN 38           // GPIO pin connected to the LED
void app_main() {
    // Disable ESP32 system logs from interfering with UART
    esp_log_level_set("*", ESP_LOG_NONE);
    // UART configuration
    uart_config_t uart_config = {
        .baud_rate = 115200,              // Standard baud rate
        .data_bits = UART_DATA_8_BITS,    // 8 data bits
        .parity = UART_PARITY_DISABLE,    // No parity
        .stop_bits = UART_STOP_BITS_1,    // 1 stop bit
        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE // Disable flow control
    };
    // Apply UART configuration to UART2
    uart_param_config(UART_NUM, &uart_config);
    // Set TX and RX pins, leaving RTS and CTS as unused
    uart_set_pin(UART_NUM, TXD_PIN, RXD_PIN, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
    // Install UART driver
    esp_err_t uart_driver_status = uart_driver_install(UART_NUM, 1024, 0, 0, NULL, 0);
    if (uart_driver_status != ESP_OK) {
        printf("Failed to install UART driver: %s\n", esp_err_to_name(uart_driver_status));
        return;
    }
    // Configure LED GPIO pin as output
    gpio_set_direction(LED_PIN, GPIO_MODE_OUTPUT);
    // Main loop: send '1' and '0' alternately, toggling the LED
    while (1) {
        // Send '1' to indicate LED ON
        char data = '1';
        uart_write_bytes(UART_NUM, &data, 1);
        printf("Master sent: %c\n", data);
        // Turn LED ON
        gpio_set_level(LED_PIN, 1);
        vTaskDelay(pdMS_TO_TICKS(5000));  // 5-second delay
        // Send '0' to indicate LED OFF
        data = '0';
        uart_write_bytes(UART_NUM, &data, 1);
        printf("Master sent: %c\n", data);
        // Turn LED OFF
        gpio_set_level(LED_PIN, 0);
        vTaskDelay(pdMS_TO_TICKS(5000));  // 5-second delay
    }
}