#include "driver/gpio.h"            // For GPIO driver-level macros
#include "soc/io_mux_reg.h"         // For configuring the MUX (multiplexer)
#include "soc/gpio_reg.h"           // For direct GPIO register access
#include "soc/gpio_periph.h"        // For GPIO pin definitions

// --- Constants --- //
#define GPIO_PIN 5    // GPIO pin connected to the LED

void setup() {
  // --- TODO: Set the pin function to GPIO using the appropriate macro --- //
  // Hint: Use a macro to select the GPIO function for GPIO_PIN
  // PIN_FUNC_SELECT(...)

  // set the GPIO function for pin 5
  // configure pin 5 to function as GPIO
  PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO5_U, FUNC_GPIO5_GPIO5);
  
  // --- TODO: Enable the GPIO pin as an output --- //
  // Hint: Use GPIO_ENABLE_REG and a bitwise OR operation
  // *((volatile uint32_t *)...) |= ...

  // set GPIO5 as an output
  // U for unsigned
  *(volatile uint32_t *)(GPIO_ENABLE_REG) |= (1U << GPIO_PIN);
}

void loop() {
  // --- TODO: Turn the LED ON --- //
  // Hint: Set the output register bit corresponding to GPIO_PIN to 1
  // *((volatile uint32_t *)...) |= ...
  
  //turn on LED
  // U for unsigned
 *(volatile uint32_t *)(GPIO_OUT_REG) |= (1U << GPIO_PIN);
  // Wait for 1 second
  delay(1000);

  // --- TODO: Turn the LED OFF --- //
  // Hint: Clear the output register bit corresponding to GPIO_PIN
  // *((volatile uint32_t *)...) &= ...

  // turn off LED
  // U for unsigned
  *(volatile uint32_t *)(GPIO_OUT_REG) &= ~(1U << GPIO_PIN); 

  // Wait again
  delay(1000);
}