/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2023 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include <stdio.h>
/* Private includes ----------------------------------------------------------*/

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/* Private macro -------------------------------------------------------------*/
#define BIT(n)  (1 << (n))

/* Private variables ---------------------------------------------------------*/

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);

/* Private user code ---------------------------------------------------------*/

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* MCU Configuration--------------------------------------------------------*/
  /* Configure the system clock */
  SystemClock_Config();

  /* Initialize all configured peripherals */
  MX_GPIO_Init();

	/* Loop forever */
	while (1)
	{
		// PB0 has external pull-up, so default value is High (1)
		if(GPIOB->IDR & BIT(0))
		{
			// PA5 reset
			GPIOA->ODR &= ~BIT(5);
		}
		else
		{
			// PA5 set
			GPIOA->ODR |= BIT(5);
		}

		// Software delay
		//delay_ms(1000);
	}
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  
}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  // Enable clock for GPIOA & GPIOC peripheral
	RCC->APB2ENR |= BIT(2) | BIT(3) |  BIT(4);

	//PB0 - Input & pull-up
	GPIOB->CRL &= ~(0x0F);
	GPIOB->CRL |= BIT(3);
  GPIOB->ODR |= BIT(0);

	// PA5 as push-pull output (2 MHz)
	GPIOA->CRL &= ~(0x0F << 20); // Clear MODE5 & CNF5
	GPIOA->CRL |= BIT(21);

	// PC13 as input floating
	GPIOC->CRH &= ~(0x0F << 20); // Clear MODE13 & CNF13
	GPIOC->CRH |= BIT(22);
}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */