/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    I2C/I2C_TwoBoards_ComPolling/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
  *          Polling transfer.
  *          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 */
/* Private variables ---------------------------------------------------------*/
/* Buffer used for transmission */
uint8_t aTxBuffer[] = " ****I2C_TwoBoards communication based on Polling****  ****I2C_TwoBoards communication based on Polling****  ****I2C_TwoBoards communication based on Polling**** ";

/* Buffer used for reception */
uint8_t aRxBuffer[RXBUFFERSIZE];
/* 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 and LED3 */
  BSP_LED_Init(LED2);
  BSP_LED_Init(LED3);


#ifdef MASTER_BOARD

  /* Configure User push-button (B1) */
  BSP_PB_Init(BUTTON_SW1, BUTTON_MODE_GPIO);
  /* USER CODE END 2 */

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

  /* Delay to avoid that possible signal rebound is taken as button release */
  HAL_Delay(50);

  /* 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 */
  /* Timeout is set to 10S */
  while (HAL_I2C_Master_Transmit(&hi2c1, (uint16_t)I2C_ADDRESS, (uint8_t *)aTxBuffer, TXBUFFERSIZE, 10000) != 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();
    }
  }

  /* Turn LED2 on: Transfer in Transmission process is correct */
  BSP_LED_On(LED2);

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

  /* Delay to avoid that possible signal rebound is taken as button release */
  HAL_Delay(50);

  /* 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 ############################*/
  /* Timeout is set to 10S */
  while (HAL_I2C_Master_Receive(&hi2c1, (uint16_t)I2C_ADDRESS, (uint8_t *)aRxBuffer, RXBUFFERSIZE, 10000) != HAL_OK)
  {
    /* Error_Handler() function is called when Timeout error occurs.
       When Acknowledge failure occurs (Slave don't acknowledge it's address)
       Master restarts communication */
    if (HAL_I2C_GetError(&hi2c1) != HAL_I2C_ERROR_AF)
    {
      Error_Handler();
    }
  }

  /* Turn LED2 off: Transfer in reception process is correct */
  BSP_LED_Off(LED2);

#else

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

  /*##- Put I2C peripheral in reception process ###########################*/
  /* Timeout is set to 10S  */
  if (HAL_I2C_Slave_Receive(&hi2c1, (uint8_t *)aRxBuffer, RXBUFFERSIZE, 10000) != HAL_OK)
  {
    /* Transfer error in reception process */
    Error_Handler();
  }

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

  /*##- Start the transmission process #####################################*/
  /* While the I2C in reception process, user can transmit data through
     "aTxBuffer" buffer */
  /* Timeout is set to 10S */
  if (HAL_I2C_Slave_Transmit(&hi2c1, (uint8_t *)aTxBuffer, TXBUFFERSIZE, 10000) != HAL_OK)
  {
    /* Transfer error in transmission process */
    Error_Handler();
  }

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

#endif /* MASTER_BOARD */

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

  /* Infinite loop */
  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  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 */
  /* 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 */
