#include "stm32f1xx_hal.h"
#include <LiquidCrystal_I2C.h>  // Include the correct library

#define LED_PIN                                GPIO_PIN_9
#define LED_GPIO_PORT                          GPIOB
#define LED_GPIO_CLK_ENABLE()                  __HAL_RCC_GPIOB_CLK_ENABLE()

LiquidCrystal_I2C lcd(0x27, 16, 2); // Initialize LCD (I2C address 0x27, 16 columns, 2 rows)

void SystemClock_Config(void);
void I2C_Init(void);

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

  // Initialize GPIO for LED
  GPIO_InitTypeDef GPIO_InitStruct;
  GPIO_InitStruct.Pin = LED_PIN;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  HAL_GPIO_Init(LED_GPIO_PORT, &GPIO_InitStruct);

  // Initialize I2C for LCD
  I2C_Init();
  lcd.begin();  // Initialize LCD
  lcd.clear();  // Clear any previous data
  lcd.setCursor(0, 0);  // Set cursor to the first row, first column
  lcd.print("STM32 Blue Pill");

  while (1)
  {
    // Toggle LED
    HAL_GPIO_TogglePin(LED_GPIO_PORT, LED_PIN);
    HAL_Delay(500);

    // Update the message on the LCD
    lcd.setCursor(0, 1);  // Move cursor to the second row
    lcd.print("LED Blinking...");
    HAL_Delay(500);
  }
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL9;
  HAL_RCC_OscConfig(&RCC_OscInitStruct);

  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2);
}

void I2C_Init(void)
{
  // Enable the I2C peripheral clock
  __HAL_RCC_I2C1_CLK_ENABLE();
  
  I2C_HandleTypeDef hi2c1;
  hi2c1.Instance = I2C1;
  hi2c1.Init.ClockSpeed = 100000;  // Standard mode 100kHz
  hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
  hi2c1.Init.OwnAddress1 = 0;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  HAL_I2C_Init(&hi2c1);
}