/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2021 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdio.h> /* for printf */
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;
DMA_HandleTypeDef hdma_i2c1_tx;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_I2C1_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* Uncomment this line to use the board as master, if not it is used as slave */
#define MASTER_BOARD
/* I2C SPEEDCLOCK define to max value: 400 KHz on STM32F1xx*/
//#define I2C_SPEEDCLOCK   400000
//#define I2C_DUTYCYCLE    I2C_DUTYCYCLE_2

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_I2C1_Init();
  /* USER CODE BEGIN 2 */

  /* --------------------------------------------------------*/
  //extern I2C_HandleTypeDef hi2c1;  // change your handler here accordingly

  #define SLAVE_ADDRESS_LCD 0x4E // change this according to ur setup

    void lcd_send_cmd(char cmd) {
        char data_u, data_l;
        uint8_t data_t[4];
        data_u = (cmd & 0xf0);
        data_l = ((cmd << 4) & 0xf0);
        data_t[0] = data_u | 0x0C;  //en=1, rs=0
        data_t[1] = data_u | 0x08;  //en=0, rs=0
        data_t[2] = data_l | 0x0C;  //en=1, rs=0
        data_t[3] = data_l | 0x08;  //en=0, rs=0
        /*  Before starting a new communication transfer, you need to check the current
         state of the peripheral; if it�s busy you need to wait for the end of current
         transfer before starting a new one.
         For simplicity reasons, this example is just waiting till the end of the
         transfer, but application may perform other tasks while transfer operation
         is ongoing. */

        while (HAL_I2C_Master_Transmit_DMA(&hi2c1, SLAVE_ADDRESS_LCD,
                (uint8_t*) data_t, 4) != HAL_OK) {
            /* Error_Handler() function is called when Timeout error occurs.
             When Acknowledge failure occurs (Slave don't acknowledge its address)
             Master restarts communication */
            if (HAL_I2C_GetError(&hi2c1) != HAL_I2C_ERROR_AF) {
                Error_Handler();
            }
        }
        while (HAL_I2C_GetState(&hi2c1) != HAL_I2C_STATE_READY) {
            //HAL_I2C_Master_Transmit (&hi2c1, SLAVE_ADDRESS_LCD,(uint8_t *) data_t, 4, 100);

            /*##-2- Start the transmission process #####################################*/
            /* While the I2C in reception process, user can transmit data through
             "aTxBuffer" buffer */
        }
    }
  void lcd_send_data (char data)
  {
    char data_u, data_l;
    uint8_t data_t[4];
    data_u = (data&0xf0);
    data_l = ((data<<4)&0xf0);
    data_t[0] = data_u|0x0D;  //en=1, rs=0
    data_t[1] = data_u|0x09;  //en=0, rs=0
    data_t[2] = data_l|0x0D;  //en=1, rs=0
    data_t[3] = data_l|0x09;  //en=0, rs=0
    /*  Before starting a new communication transfer, you need to check the current
     state of the peripheral; if it�s busy you need to wait for the end of current
     transfer before starting a new one.
     For simplicity reasons, this example is just waiting till the end of the
     transfer, but application may perform other tasks while transfer operation
     is ongoing. */
    while (HAL_I2C_Master_Transmit_DMA(&hi2c1, SLAVE_ADDRESS_LCD,
            (uint8_t*) data_t, 4) != HAL_OK) {
        /* Error_Handler() function is called when Timeout error occurs.
         When Acknowledge failure occurs (Slave don't acknowledge its address)
         Master restarts communication */
        if (HAL_I2C_GetError(&hi2c1) != HAL_I2C_ERROR_AF) {
            Error_Handler();
        }
    }
    while (HAL_I2C_GetState(&hi2c1) != HAL_I2C_STATE_READY) {
        //HAL_I2C_Master_Transmit (&hi2c1, SLAVE_ADDRESS_LCD,(uint8_t *) data_t, 4, 100);

        /*##-2- Start the transmission process #####################################*/
        /* While the I2C in reception process, user can transmit data through
         "aTxBuffer" buffer */
    }
}

  void lcd_clear (void)
  {
    lcd_send_cmd (0x80);
    for (int i=0; i<70; i++)
    {
        lcd_send_data (' ');
    }
  }

  void lcd_put_cur(int row, int col)
  {
      switch (row)
      {
          case 0:
              col |= 0x80;
              break;
          case 1:
              col |= 0xC0;
              break;
      }

      lcd_send_cmd (col);
  }


  void lcd_init (void)
  {
    // 4 bit initialisation
    HAL_Delay(50);  // wait for >40ms
    lcd_send_cmd (0x30);
    HAL_Delay(5);  // wait for >4.1ms
    lcd_send_cmd (0x30);
    HAL_Delay(1);  // wait for >100us
    lcd_send_cmd (0x30);
    HAL_Delay(10);
    lcd_send_cmd (0x20);  // 4bit mode
    HAL_Delay(10);

    // dislay initialisation
    lcd_send_cmd (0x28); // Function set --> DL=0 (4 bit mode), N = 1 (2 line display) F = 0 (5x8 characters)
    HAL_Delay(1);
    lcd_send_cmd (0x08); //Display on/off control --> D=0,C=0, B=0  ---> display off
    HAL_Delay(1);
    lcd_send_cmd (0x01);  // clear display
    HAL_Delay(1);
    HAL_Delay(1);
    lcd_send_cmd (0x06); //Entry mode set --> I/D = 1 (increment cursor) & S = 0 (no shift)
    HAL_Delay(1);
    lcd_send_cmd (0x0C); //Display on/off control --> D = 1, C and B = 0. (Cursor and blink, last two bits)
  }

  void lcd_send_string (char *str)
  {
    while (*str) lcd_send_data (*str++);
  }

  /* --------------------------------------------------------*/
   lcd_init ();
   lcd_clear(); // clear LCD
   lcd_put_cur(0,0); // Put are cursor in the right place
   lcd_send_string ("Hello World!");
   HAL_Delay(5000);
   lcd_clear(); // clear LCD

   lcd_put_cur(1,0); // Put are cursor in the right place
   lcd_send_string ("Cool, It works!");

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
          HAL_Delay(1500);
          lcd_put_cur(0,6);
          lcd_send_string ("HELLO");
          lcd_put_cur(1,6);
          lcd_send_string ("WORLD!");
          HAL_Delay(1500);
          lcd_clear();
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** 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_DIV2;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL11;
  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_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

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

/**
  * @brief I2C1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_I2C1_Init(void)
{

  /* USER CODE BEGIN I2C1_Init 0 */

  /* USER CODE END I2C1_Init 0 */

  /* USER CODE BEGIN I2C1_Init 1 */

  /* USER CODE END I2C1_Init 1 */
  hi2c1.Instance = I2C1;
  hi2c1.Init.ClockSpeed = 100000;
  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;
  if (HAL_I2C_Init(&hi2c1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN I2C1_Init 2 */

  /* USER CODE END I2C1_Init 2 */

}

/**
  * Enable DMA controller clock
  */
static void MX_DMA_Init(void)
{

  /* DMA controller clock enable */
  __HAL_RCC_DMA1_CLK_ENABLE();

  /* DMA interrupt init */
  /* DMA1_Channel6_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Channel6_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Channel6_IRQn);

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{

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

}

/* USER CODE BEGIN 4 */
void HAL_I2C_MasterTxCpltCallback(I2C_HandleTypeDef *hi2c)
{
    printf("Dane TxCpltCallback \r\n");
}
/*
void HAL_I2C_MasterRxCpltCallback(I2C_HandleTypeDef *hi2c)
{
    printf("Dane RxCpltCallback \r\n");
}
*/
/* 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 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/