#include "main.h"

void SystemClock_Config(void);
static void MX_GPIO_Init(void);

void lcd_cmd(uint8_t cmd);
void lcd_data(uint8_t data);
void lcd_init(void);

// int command[] = { 0x33, 0x32, 0x28, 0x0C, 0x06, 0x01 };  // Init, 4-bit, 2-line, display on, entry mode, clearint data_val[] = { 0x30, 0x31, 0x032, 0x033,0x34, 0x35, 0x36, 0x37, 0x38, 0x39 };
// int data_val[] = { 0x30, 0x31, 0x032, 0x033,0x34, 0x35, 0x36, 0x37, 0x38, 0x39 };
//char mgs[]= "anscer robotics";

int main(void)
{
  HAL_Init();

  SystemClock_Config();

  MX_GPIO_Init();

  lcd_init();

  char data[] = "0123456789:";
  for (int i = 0; data[i] != '\0'; i++) 
  {
    lcd_data(data[i]);
    HAL_Delay(200);
  }

  lcd_cmd(0xC0);

  char mgs[]= "ANSCER ROBOTICS";
  for(int i=0; mgs[i] != '\0'; i++)
  {
    lcd_data(mgs[i]);
    HAL_Delay(300);
  }

  while (1)
  {
    
  }

}

void lcd_cmd(uint8_t cmd)
{
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_RESET); // RS = 0
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_1, GPIO_PIN_RESET); // RW = 0

    // Send high nibble (PA4–PA7)
    GPIOA->ODR = (GPIOA->ODR & 0x0F) | (cmd & 0xF0);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_2, GPIO_PIN_SET);  // EN = 1
    HAL_Delay(1);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_2, GPIO_PIN_RESET); // EN = 0
    HAL_Delay(1);

    // Send low nibble (PA4–PA7)
    GPIOA->ODR = (GPIOA->ODR & 0x0F) | ((cmd << 4) & 0xF0);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_2, GPIO_PIN_SET);
    HAL_Delay(1);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_2, GPIO_PIN_RESET);

    HAL_Delay(2);
}

void lcd_data(uint8_t data)
{
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0, GPIO_PIN_SET);   // RS = 1
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_1, GPIO_PIN_RESET); // RW = 0

    // Send high nibble (PA4–PA7)
    GPIOA->ODR = (GPIOA->ODR & 0x0F) | (data & 0xF0);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_2, GPIO_PIN_SET);
    HAL_Delay(1);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_2, GPIO_PIN_RESET);

    HAL_Delay(1);

    // Send low nibble (PA4–PA7)
    GPIOA->ODR = (GPIOA->ODR & 0x0F) | ((data << 4) & 0xF0);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_2, GPIO_PIN_SET);
    HAL_Delay(1);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_2, GPIO_PIN_RESET);

    HAL_Delay(2);
}

void lcd_init(void)
{
  lcd_cmd(0x02); // 4-bit mode init
  lcd_cmd(0x28); // 2-line, 5x8 font
  lcd_cmd(0x0C); // Display ON, Cursor OFF
  lcd_cmd(0x06); // Entry mode
  lcd_cmd(0x01); // Clear display
  HAL_Delay(2);
}



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

  __HAL_FLASH_SET_LATENCY(FLASH_LATENCY_1);

  /** 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.HSIDiv = RCC_HSI_DIV1;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  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_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    Error_Handler();
  }
}


static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  /* USER CODE BEGIN MX_GPIO_Init_1 */

  /* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_4
                          |GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7, GPIO_PIN_RESET);

  /*Configure GPIO pins : PA0 PA1 PA2 PA4
                           PA5 PA6 PA7 */
  GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_4
                          |GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* USER CODE BEGIN MX_GPIO_Init_2 */

  /* USER CODE END MX_GPIO_Init_2 */
}

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 */