/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    I2C/I2C_TwoBoards_RestartComIT/Src/main.c
  * @author  MCD Application Team
  * @brief   This sample code shows how to use STM32WLxx I2C HAL API to transmit
  *          and receive a data buffer with a communication process based on
  *          IT transfer and with a repeated start condition between the transmit
  *          and receive process.
  *          The communication is done using 2 Boards.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2020 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 "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */

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

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* Uncomment this line to use the board as master, if not it is used as slave */
//#define MASTER_BOARD
/* USER CODE END PD */

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

/* USER CODE END PM */

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

/* USER CODE BEGIN PV */
/* Buffer used for transmission */
uint8_t aTxBuffer[] = " ****I2C_TwoBoards advanced communication based on IT****  ****I2C_TwoBoards advanced communication based on IT****  ****I2C_TwoBoards advanced communication based on IT**** ";

/* Buffer used for reception */
uint8_t aRxBuffer[RXBUFFERSIZE];

#ifndef MASTER_BOARD
/* Variable used to trig an address match code event */
__IO uint32_t     uwTransferRequested = 0;
#endif
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/
static uint16_t Buffercmp(uint8_t *pBuffer1, uint8_t *pBuffer2, uint16_t BufferLength);

/* USER CODE END PFP */

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

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */
  /* STM32WLxx HAL library initialization:
       - Configure the Flash prefetch
       - Systick timer is configured by default as source of time base, but user 
         can eventually implement his proper time base source (a general purpose 
         timer for example or other time source), keeping in mind that Time base 
         duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and 
         handled in milliseconds basis.
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  /* 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_I2C1_Init();
  /* USER CODE BEGIN 2 */
  /* Configure LED2 */
  BSP_LED_Init(LED2);

#ifdef MASTER_BOARD

  /* Configure User push-button (B1) */
  BSP_PB_Init(BUTTON_SW1,BUTTON_MODE_GPIO);

  /* Wait for User push-button (B1) press before starting the Communication */
  while (BSP_PB_GetState(BUTTON_SW1) != GPIO_PIN_RESET)
  {
  }

  /* Wait for User push-button (B1) release before starting the Communication */
  while (BSP_PB_GetState(BUTTON_SW1) != GPIO_PIN_SET)
  {
  }

  /* The board sends the message and expects to receive it back */

  /*##- Start the transmission process #####################################*/
  /* While the I2C in reception process, user can transmit data through
     "aTxBuffer" buffer */
  do
  {
    if(HAL_I2C_Master_Seq_Transmit_IT(&hi2c1, (uint16_t)I2C_ADDRESS, (uint8_t*)aTxBuffer, TXBUFFERSIZE, I2C_FIRST_FRAME)!= HAL_OK)
    {
      /* Error_Handler() function is called when error occurs. */
      Error_Handler();
    }

    /*##- Wait for the end of the transfer #################################*/
    /*  Before starting a new communication transfer, you need to check the current
        state of the peripheral; if it is 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_GetState(&hi2c1) != HAL_I2C_STATE_READY)
    {
    }

    /* When Acknowledge failure occurs (Slave don't acknowledge it's address)
       Master restarts communication */
  }
  while(HAL_I2C_GetError(&hi2c1) == HAL_I2C_ERROR_AF);

  /* Wait for User push-button (B1) press before starting the Communication */
  while (BSP_PB_GetState(BUTTON_SW1) != GPIO_PIN_RESET)
  {
  }

  /* Wait for User push-button (B1) release before starting the Communication */
  while (BSP_PB_GetState(BUTTON_SW1) != GPIO_PIN_SET)
  {
  }

  /*##- Put I2C peripheral in reception process ############################*/
  do
  {
    if(HAL_I2C_Master_Seq_Receive_IT(&hi2c1, (uint16_t)I2C_ADDRESS, (uint8_t *)aRxBuffer, RXBUFFERSIZE, I2C_LAST_FRAME) != HAL_OK)
    {
      /* Error_Handler() function is called when error occurs. */
      Error_Handler();
    }

    /*##- Wait for the end of the transfer #################################*/
    /*  Before starting a new communication transfer, you need to check the current
        state of the peripheral; if it is 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_GetState(&hi2c1) != HAL_I2C_STATE_READY)
    {
    }

    /* When Acknowledge failure occurs (Slave don't acknowledge it's address)
       Master restarts communication */
  }
  while(HAL_I2C_GetError(&hi2c1) == HAL_I2C_ERROR_AF);

#else

  /* The board receives the message and sends it back */

  /*##- Put I2C peripheral in listen mode process ###########################*/
  if(HAL_I2C_EnableListen_IT(&hi2c1) != HAL_OK)
  {
    /* Transfer error in reception process */
    Error_Handler();
  }

  /*##- Wait Address Match Code event ######################################*/
  /*  Before starting a transfer, you need to wait a Master request event.
      For simplicity reasons, this example is just waiting till an Address callback event,
      but application may perform other tasks while transfer operation is ongoing. */
  while(uwTransferRequested != 1)
  {
  }

  /*##- Put I2C peripheral in reception process ############################*/
  if(HAL_I2C_Slave_Seq_Receive_IT(&hi2c1, (uint8_t *)aRxBuffer, RXBUFFERSIZE, I2C_FIRST_FRAME) != HAL_OK)
  {
    /* Transfer error in reception process */
    Error_Handler();
  }

  /*##- Wait for the end of the transfer ###################################*/
  /*  Before starting a new communication transfer, you need to check the current
      state of the peripheral; if it is 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_GetState(&hi2c1) != HAL_I2C_STATE_LISTEN)
  {
  }

  /*##- Wait Address Match Code event ######################################*/
  /*  Before starting a transfer, you need to wait a Master request event.
      For simplicity reasons, this example is just waiting till an Address callback event,
      but application may perform other tasks while transfer operation is ongoing. */
  while(uwTransferRequested != 1)
  {
  }

  /*##- Start the transmission process #####################################*/
  /* While the I2C in reception process, user can transmit data through
     "aTxBuffer" buffer */
  if(HAL_I2C_Slave_Seq_Transmit_IT(&hi2c1, (uint8_t*)aTxBuffer, TXBUFFERSIZE, I2C_LAST_FRAME)!= HAL_OK)
  {
    /* Transfer error in transmission process */
    Error_Handler();
  }

#endif /* MASTER_BOARD */

  /*##- Wait for the end of the transfer ###################################*/
  /*  Before starting a new communication transfer, you need to check the current
      state of the peripheral; if it is 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_GetState(&hi2c1) != HAL_I2C_STATE_READY)
  {
  }

  /*##- Compare the sent and received buffers ##############################*/
  if(Buffercmp((uint8_t*)aTxBuffer,(uint8_t*)aRxBuffer,RXBUFFERSIZE))
  {
    /* Processing Error */
    Error_Handler();
  }
  /* USER CODE END 2 */

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

    /* USER CODE BEGIN 3 */

  }
  /* USER CODE END 3 */
}

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

  /** Configure the main internal regulator output voltage
  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure the SYSCLKSource, HCLK, PCLK1 and PCLK2 clocks dividers
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK3|RCC_CLOCKTYPE_HCLK
                              |RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1
                              |RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.AHBCLK3Divider = RCC_SYSCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != 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.Timing = 0x0030081C;
  hi2c1.Init.OwnAddress1 = I2C_ADDRESS;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_10BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c1) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure Analogue filter
  */
  if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure Digital filter
  */
  if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
  {
    Error_Handler();
  }
  /** I2C Fast mode Plus enable
  */
  HAL_I2CEx_EnableFastModePlus(I2C_FASTMODEPLUS_I2C1);
  /* USER CODE BEGIN I2C1_Init 2 */

  /* USER CODE END I2C1_Init 2 */

}

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

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

}

/* USER CODE BEGIN 4 */
/**
  * @brief  Tx Transfer completed callback.
  * @param  I2cHandle: I2C handle
  * @note   This example shows a simple way to report end of IT Tx transfer, and
  *         you can add your own implementation.
  * @retval None
  */
#ifdef MASTER_BOARD
void HAL_I2C_MasterTxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
  /* Turn LED2 on: Transfer in transmission process is correct */
  BSP_LED_On(LED2);
}
#else
void HAL_I2C_SlaveTxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
  /* Reset address match code event */
  uwTransferRequested = 0;

  /* Turn LED2 off: Transfer in transmission process is correct */
  BSP_LED_Off(LED2);
}
#endif /* MASTER_BOARD */

/**
  * @brief  Rx Transfer completed callback.
  * @param  I2cHandle: I2C handle
  * @note   This example shows a simple way to report end of IT Rx transfer, and
  *         you can add your own implementation.
  * @retval None
  */
#ifdef MASTER_BOARD
void HAL_I2C_MasterRxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
  /* Turn LED2 off: Transfer in reception process is correct */
  BSP_LED_Off(LED2);
}
#else
void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *I2cHandle)
{
  /* Reset address match code event */
  uwTransferRequested = 0;

  /* Turn LED2 on: Transfer in reception process is correct */
  BSP_LED_On(LED2);
}
#endif /* MASTER_BOARD */

#ifndef MASTER_BOARD
/**
  * @brief  Slave Address Match callback.
  * @param  hi2c Pointer to a I2C_HandleTypeDef structure that contains
  *                the configuration information for the specified I2C.
  * @param  TransferDirection: Master request Transfer Direction (Write/Read), value of @ref I2C_XferOptions_definition
  * @param  AddrMatchCode: Address Match Code
  * @retval None
  */
void HAL_I2C_AddrCallback(I2C_HandleTypeDef *hi2c, uint8_t TransferDirection, uint16_t AddrMatchCode)
{
  uwTransferRequested = 1;
}

/**
  * @brief  Listen Complete callback.
  * @param  hi2c Pointer to a I2C_HandleTypeDef structure that contains
  *                the configuration information for the specified I2C.
  * @retval None
  */
void HAL_I2C_ListenCpltCallback(I2C_HandleTypeDef *hi2c)
{
}
#endif

/**
  * @brief  I2C error callbacks.
  * @param  I2cHandle: I2C handle
  * @note   This example shows a simple way to report transfer error, and you can
  *         add your own implementation.
  * @retval None
  */
void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *I2cHandle)
{
  /** Error_Handler() function is called when error occurs.
    * 1- When Slave doesn't acknowledge its address, Master restarts communication.
    * 2- When Master doesn't acknowledge the last data transferred, Slave doesn't care in this example.
    */
  if (HAL_I2C_GetError(I2cHandle) != HAL_I2C_ERROR_AF)
  {
    /* Turn Off LED2 */
    BSP_LED_Off(LED2);

    Error_Handler();
  }
}

/**
  * @brief  Compares two buffers.
  * @param  pBuffer1, pBuffer2: buffers to be compared.
  * @param  BufferLength: buffer's length
  * @retval 0  : pBuffer1 identical to pBuffer2
  *         >0 : pBuffer1 differs from pBuffer2
  */
static uint16_t Buffercmp(uint8_t* pBuffer1, uint8_t* pBuffer2, uint16_t BufferLength)
{
  while (BufferLength--)
  {
    if ((*pBuffer1) != *pBuffer2)
    {
      return BufferLength;
    }
    pBuffer1++;
    pBuffer2++;
  }

  return 0;
}
/* 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 */
  /* Turn LED3 on */
  BSP_LED_On(LED3);
  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) */
  Error_Handler();
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
