// STM32 Nucleo-L031K6 HAL Blink example
// Simulation: https://wokwi.com/projects/367244067477216257 (original)

#include <stdint.h>
#include <stm32l0xx_hal.h>

// ST Nucleo Green user LED (PB3)
#define LED_PORT                 GPIOB
#define LED_PIN                  GPIO_PIN_3
#define LED_PORT_CLK_ENABLE      __HAL_RCC_GPIOB_CLK_ENABLE

void SystemClock_Config(void);

void osSystickHandler(void)
{
  // 1 Hz blinking:
  if ((HAL_GetTick() % 500) == 0)
  {
    HAL_GPIO_TogglePin(LED_PORT, LED_PIN);
  }
}

void initGPIO()
{
  GPIO_InitTypeDef GPIO_Config;

  GPIO_Config.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_Config.Pull = GPIO_NOPULL;
  GPIO_Config.Speed = GPIO_SPEED_FREQ_HIGH;

  GPIO_Config.Pin = LED_PIN;

  LED_PORT_CLK_ENABLE();
  HAL_GPIO_Init(LED_PORT, &GPIO_Config);

  // Esta linha ja foi habilitada por LED_PORT_CLK_ENABLE(); poderia ser removida
  // __HAL_RCC_GPIOB_CLK_ENABLE(); 
}

int main(void)
{
  HAL_Init();
  SystemClock_Config();

  initGPIO();

  HAL_GPIO_TogglePin(LED_PORT, LED_PIN); // Liga o LED na inicialização

  while (1); // Loop infinito para o programa continuar rodando

  return 0;
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  // RCC_PeriphCLKInitTypeDef PeriphClkInit = {0}; // Removido, pois não há periféricos específicos de clock agora.

  /** Configure the main internal regulator output voltage
  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  /** Initializes the RCC Oscillators according to the specified parameters
    in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL_4;
  RCC_OscInitStruct.PLL.PLLDIV = RCC_PLLDIV_2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
                                | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    Error_Handler();
  }
  // PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2; // Removido
  // PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1; // Removido
  // if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) // Removido
  // {
  //   Error_Handler();
  // }
}

void Error_Handler(void)
{
  /* User can add his own implementation to report the HAL error return state */
  while(1); // Em caso de erro, o programa trava aqui
}

// Funções de UART e _write() foram removidas