/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    gpio.c
  * @brief   This file provides code for the configuration
  *          of all used GPIO pins.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2026 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.
  *
  ******************************************************************************
  */
/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/
#include "gpio.h"

/* USER CODE BEGIN 0 */
#include "stm32f1xx_hal.h"



/* USER CODE END 0 */

/*----------------------------------------------------------------------------*/
/* Configure GPIO                                                             */
/*----------------------------------------------------------------------------*/
/* USER CODE BEGIN 1 */

volatile uint32_t last_interrupt_time=0;
volatile uint8_t first_time_state=1;
volatile GPIO_PinState original_pin_state = GPIO_PIN_RESET, last_original_pin = GPIO_PIN_SET;
volatile int8_t edge_state = NO_EDGE;

/* USER CODE END 1 */

/** Configure pins as
        * Analog
        * Input
        * Output
        * EVENT_OUT
        * EXTI
        * Free pins are configured automatically as Analog (this feature is enabled through
        * the Code Generation settings)
*/
void MX_GPIO_Init(void)
{

  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOC, DIGI_OUT5_Pin|DIGI_OUT6_Pin|DIGI_OUT7_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, DIGI_OUT0_Pin|DIGI_OUT1_Pin|DIGI_OUT2_Pin|LED_Red_Pin
                          |LED_Green_Pin|DIGI_OUT3_Pin|DIGI_OUT4_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(TX_EN_RS485_GPIO_Port, TX_EN_RS485_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pins : DIGI_OUT5_Pin DIGI_OUT6_Pin DIGI_OUT7_Pin */
  GPIO_InitStruct.Pin = DIGI_OUT5_Pin|DIGI_OUT6_Pin|DIGI_OUT7_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /*Configure GPIO pins : RS485_Addr0_Pin RS485_Addr1_Pin RS485_Addr2_Pin RS485_Addr3_Pin
                           SYS_CFG0_Pin SYS_CFG1_Pin PG_RS485_Pin PG_CE_Pin
                           PG_PH_Pin */
  GPIO_InitStruct.Pin = RS485_Addr0_Pin|RS485_Addr1_Pin|RS485_Addr2_Pin|RS485_Addr3_Pin
                          |SYS_CFG0_Pin|SYS_CFG1_Pin|PG_RS485_Pin|PG_CE_Pin
                          |PG_PH_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pins : DIGI_OUT0_Pin DIGI_OUT1_Pin DIGI_OUT2_Pin LED_Red_Pin
                           LED_Green_Pin DIGI_OUT3_Pin DIGI_OUT4_Pin */
  GPIO_InitStruct.Pin = DIGI_OUT0_Pin|DIGI_OUT1_Pin|DIGI_OUT2_Pin|LED_Red_Pin
                          |LED_Green_Pin|DIGI_OUT3_Pin|DIGI_OUT4_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pins : RS485_Addr4_Pin RS485_Addr5_Pin RS485_Addr6_Pin RS485_Addr7_Pin */
  GPIO_InitStruct.Pin = RS485_Addr4_Pin|RS485_Addr5_Pin|RS485_Addr6_Pin|RS485_Addr7_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pin : TX_EN_RS485_Pin */
  GPIO_InitStruct.Pin = TX_EN_RS485_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(TX_EN_RS485_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : Calib_PH_Pin */
  GPIO_InitStruct.Pin = Calib_PH_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING_FALLING;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(Calib_PH_GPIO_Port, &GPIO_InitStruct);

  /* EXTI interrupt init*/
  HAL_NVIC_SetPriority(EXTI3_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI3_IRQn);

}

/* USER CODE BEGIN 2 */

/**
 * @brief  EXTI line3 interrupt callback.
 * @details This function is called by the HAL EXTI IRQ Handler.
 *          It distinguishes between rising and falling edges by reading the pin state.
 * @param  GPIO_Pin: Specifies the pins connected to the EXTI line.
 * @retval None
 */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
    if ((GPIO_Pin == Calib_PH_Pin) && (main_state == STATE_RUNNING_OK))
    {
    	uint32_t current_time = HAL_GetTick();
    	GPIO_PinState pin_state = HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_3);

    	if(pin_state != last_original_pin)
    	{
			if(first_time_state == 1)
			{
				original_pin_state = pin_state;
				first_time_state = 0;
			}
			else if(((current_time - last_interrupt_time) > 70U) && (pin_state == original_pin_state))
			{
				if(pin_state == GPIO_PIN_RESET)
				{
					/* --- LOGIC FOR FALLING EDGE HERE --- */
					//HAL_GPIO_WritePin(GPIOB, GPIO_PIN_4, GPIO_PIN_SET);
					//HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_RESET);
					edge_state = FALLING_EDGE;
				}
				else
				{
					/* --- LOGIC FOR RISING EDGE HERE --- */
					//HAL_GPIO_WritePin(GPIOB, GPIO_PIN_4, GPIO_PIN_RESET);
					//HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_SET);
					edge_state = RISING_EDGE;
				}
				last_interrupt_time = current_time;
				last_original_pin = original_pin_state;
				first_time_state = 1;
			}
    	}
    }
}


/* USER CODE END 2 */