path: root/Projects/P-NUCLEO-WB55.Nucleo/Examples_LL/I2C/I2C_OneBoard_AdvCommunication_DMAAndIT_Init/Src/main.c

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    Examples_LL/I2C/I2C_OneBoard_AdvCommunication_DMAAndIT_Init/Src/main.c
  * @author  MCD Application Team
  * @brief   This example describes how to send/receive bytes over I2C IP using
  *          the STM32WBxx I2C LL API.
  *          Peripheral initialization done using LL unitary services functions.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2019-2021 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 */
/**
  * @brief Timeout value
  */
#if (USE_TIMEOUT == 1)
#define DMA_SEND_TIMEOUT_TC_MS          5
#define I2C_SEND_TIMEOUT_TC_MS          2
#define I2C_SEND_TIMEOUT_STOP_MS        5
#endif /* USE_TIMEOUT */

/**
  * @brief I2C devices settings
  */
/* Timing register value is computed with the STM32CubeMX Tool,
  * Fast Mode @400kHz with I2CCLK = 64 MHz,
  * rise time = 100ns, fall time = 10ns
  * Timing Value = (uint32_t)0x00C0216C
  */
#define I2C_TIMING                      0x00C0216C

#define SLAVE_CHIP_NAME                 0
#define SLAVE_CHIP_REVISION             1

/* USER CODE END PD */

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

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */
#if (USE_TIMEOUT == 1)
uint32_t Timeout                        = 0; /* Variable used for Timeout management */
#endif /* USE_TIMEOUT */
__IO uint8_t  ubButtonPress             = 0;

/**
  * @brief Variables related to Master process
  */
/* aCommandCode declaration array    */
/* [CommandCode][RequestSlaveAnswer] */
/* {CODE, YES/NO}                    */
const char*  aCommandCode[4][4]         = {
                                           {"CHIP NAME", "YES"},
                                           {"CHIP REVISION", "YES"},
                                           {"LOW POWER", "NO"},
                                           {"WAKE UP", "NO"}
                                          };

uint32_t*     pMasterTransmitBuffer     = (uint32_t*)(&aCommandCode[0][0]);
uint8_t       ubMasterNbCommandCode     = sizeof(aCommandCode[0][0]);
uint8_t       aMasterReceiveBuffer[0xF] = {0};
__IO uint8_t  ubMasterNbDataToReceive   = sizeof(aMasterReceiveBuffer);
__IO uint8_t  ubMasterNbDataToTransmit  = 0;
uint8_t       ubMasterCommandIndex      = 0;
__IO uint8_t  ubMasterReceiveIndex      = 0;
__IO uint8_t  ubMasterTransferComplete  = 0;

/**
  * @brief Variables related to Slave process
  */
const char*   aSlaveInfo[]              = {
                                          "STM32WB55RG",
                                          "1.2.3"};

uint8_t       aSlaveReceiveBuffer[0xF]  = {0};
uint8_t*      pSlaveTransmitBuffer      = 0;
uint8_t       ubSlaveInfoIndex          = 0xFF;
__IO uint8_t  ubSlaveReceiveIndex       = 0;
__IO uint8_t  ubSlaveReceiveComplete    = 0;

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void PeriphCommonClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_I2C1_Init(void);
static void MX_I2C3_Init(void);
/* USER CODE BEGIN PFP */
uint8_t  Buffercmp8(uint8_t* pBuffer1, uint8_t* pBuffer2, uint8_t BufferLength);
void     FlushBuffer8(uint8_t* pBuffer1);
void     LED_On(void);
void     LED_Off(void);
void     LED_Blinking(uint32_t Period);
void     WaitForUserButtonPress(void);
void     Handle_I2C_Master_Transmit(void);
void     Handle_I2C_Master_TransmitReceive(void);
#if defined(__GNUC__)
extern void initialise_monitor_handles(void);	/*rtt*/
#endif

/* 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 */

  /* USER CODE END 1 */

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

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */

  NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);

  /* System interrupt init*/

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

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

/* Configure the peripherals common clocks */
  PeriphCommonClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_I2C1_Init();
  MX_I2C3_Init();
  /* USER CODE BEGIN 2 */
#if defined(__GNUC__)
  initialise_monitor_handles();	/*rtt*/
#endif

  /* Set LED2 Off */
  LED_Off();


  /* USER CODE END 2 */

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

    /* USER CODE BEGIN 3 */

    /* Wait for User push-button (SW1) press to start transfer */
    WaitForUserButtonPress();

    /* Clear User push-button (SW1) related variable */
    ubButtonPress = 0;

    if(strncmp(aCommandCode[ubMasterCommandIndex][1], "NO", 2) == 0)
    {
      /* Handle I2C3 events (Master Transmit only) */
      Handle_I2C_Master_Transmit();
    }
    else
    {
      /* Handle I2C3 events (Master Transmit then Receive) */
      Handle_I2C_Master_TransmitReceive();
    }
    
    /* Prepare Index to send next command code */
    ubMasterCommandIndex++;
    if(ubMasterCommandIndex >= ubMasterNbCommandCode)
    {
      ubMasterCommandIndex = 0;
    }
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);

  /* MSI configuration and activation */
  LL_RCC_MSI_Enable();
  while(LL_RCC_MSI_IsReady() != 1)
  {
  }

  /* Main PLL configuration and activation */
  LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_MSI, LL_RCC_PLLM_DIV_1, 32, LL_RCC_PLLR_DIV_2);
  LL_RCC_PLL_Enable();
  LL_RCC_PLL_EnableDomain_SYS();
  while(LL_RCC_PLL_IsReady() != 1)
  {
  }

  /* Sysclk activation on the main PLL */
  /* Set CPU1 prescaler*/
  LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);

  /* Set CPU2 prescaler*/
  LL_C2_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_2);

  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
  while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
  {
  }

  /* Set AHB SHARED prescaler*/
  LL_RCC_SetAHB4Prescaler(LL_RCC_SYSCLK_DIV_1);

  /* Set APB1 prescaler*/
  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);

  /* Set APB2 prescaler*/
  LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);

  LL_Init1msTick(64000000);

  /* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
  LL_SetSystemCoreClock(64000000);
}

/**
  * @brief Peripherals Common Clock Configuration
  * @retval None
  */
void PeriphCommonClock_Config(void)
{
  /* USER CODE BEGIN Smps */

  /* USER CODE END Smps */
}

/**
  * @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 */

  LL_I2C_InitTypeDef I2C_InitStruct = {0};

  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);
  /**I2C1 GPIO Configuration
  PB8   ------> I2C1_SCL
  PB9   ------> I2C1_SDA
  */
  GPIO_InitStruct.Pin = LL_GPIO_PIN_8|LL_GPIO_PIN_9;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_OPENDRAIN;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_UP;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_4;
  LL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  LL_SYSCFG_EnableFastModePlus(LL_SYSCFG_I2C_FASTMODEPLUS_PB8);

  LL_SYSCFG_EnableFastModePlus(LL_SYSCFG_I2C_FASTMODEPLUS_PB9);

  /* Peripheral clock enable */
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_I2C1);

  /* USER CODE BEGIN I2C1_Init 1 */
  /* Configure Event IT:
   *  - Set priority for I2C1_EV_IRQn
   *  - Enable I2C1_EV_IRQn
   */
  NVIC_SetPriority(I2C1_EV_IRQn, 0xF);  
  NVIC_EnableIRQ(I2C1_EV_IRQn);

  /* Configure Error IT:
   *  - Set priority for I2C1_ER_IRQn
   *  - Enable I2C1_ER_IRQn
   */
  NVIC_SetPriority(I2C1_ER_IRQn, 0xF);  
  NVIC_EnableIRQ(I2C1_ER_IRQn);
  /* USER CODE END I2C1_Init 1 */
  /** I2C Initialization
  */
  I2C_InitStruct.PeripheralMode = LL_I2C_MODE_I2C;
  I2C_InitStruct.Timing = 0x00000102;
  I2C_InitStruct.AnalogFilter = LL_I2C_ANALOGFILTER_ENABLE;
  I2C_InitStruct.DigitalFilter = 0;
  I2C_InitStruct.OwnAddress1 = 180;
  I2C_InitStruct.TypeAcknowledge = LL_I2C_ACK;
  I2C_InitStruct.OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT;
  LL_I2C_Init(I2C1, &I2C_InitStruct);
  LL_I2C_EnableAutoEndMode(I2C1);
  LL_I2C_SetOwnAddress2(I2C1, 0, LL_I2C_OWNADDRESS2_NOMASK);
  LL_I2C_DisableOwnAddress2(I2C1);
  LL_I2C_DisableGeneralCall(I2C1);
  LL_I2C_EnableClockStretching(I2C1);
  /* USER CODE BEGIN I2C1_Init 2 */
  LL_I2C_EnableIT_ADDR(I2C1);
  LL_I2C_EnableIT_NACK(I2C1);
  LL_I2C_EnableIT_ERR(I2C1);
  LL_I2C_EnableIT_STOP(I2C1);
  /* USER CODE END I2C1_Init 2 */

}

/**
  * @brief I2C3 Initialization Function
  * @param None
  * @retval None
  */
static void MX_I2C3_Init(void)
{

  /* USER CODE BEGIN I2C3_Init 0 */

  /* USER CODE END I2C3_Init 0 */

  LL_I2C_InitTypeDef I2C_InitStruct = {0};

  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOC);
  /**I2C3 GPIO Configuration
  PC0   ------> I2C3_SCL
  PC1   ------> I2C3_SDA
  */
  GPIO_InitStruct.Pin = LL_GPIO_PIN_0|LL_GPIO_PIN_1;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_OPENDRAIN;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_UP;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_4;
  LL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /* Peripheral clock enable */
  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_I2C3);

  /* I2C3 DMA Init */

  /* I2C3_TX Init */
  LL_DMA_SetPeriphRequest(DMA1, LL_DMA_CHANNEL_2, LL_DMAMUX_REQ_I2C3_TX);

  LL_DMA_SetDataTransferDirection(DMA1, LL_DMA_CHANNEL_2, LL_DMA_DIRECTION_MEMORY_TO_PERIPH);

  LL_DMA_SetChannelPriorityLevel(DMA1, LL_DMA_CHANNEL_2, LL_DMA_PRIORITY_HIGH);

  LL_DMA_SetMode(DMA1, LL_DMA_CHANNEL_2, LL_DMA_MODE_NORMAL);

  LL_DMA_SetPeriphIncMode(DMA1, LL_DMA_CHANNEL_2, LL_DMA_PERIPH_NOINCREMENT);

  LL_DMA_SetMemoryIncMode(DMA1, LL_DMA_CHANNEL_2, LL_DMA_MEMORY_INCREMENT);

  LL_DMA_SetPeriphSize(DMA1, LL_DMA_CHANNEL_2, LL_DMA_PDATAALIGN_BYTE);

  LL_DMA_SetMemorySize(DMA1, LL_DMA_CHANNEL_2, LL_DMA_MDATAALIGN_BYTE);

  /* I2C3_RX Init */
  LL_DMA_SetPeriphRequest(DMA1, LL_DMA_CHANNEL_3, LL_DMAMUX_REQ_I2C3_RX);

  LL_DMA_SetDataTransferDirection(DMA1, LL_DMA_CHANNEL_3, LL_DMA_DIRECTION_PERIPH_TO_MEMORY);

  LL_DMA_SetChannelPriorityLevel(DMA1, LL_DMA_CHANNEL_3, LL_DMA_PRIORITY_HIGH);

  LL_DMA_SetMode(DMA1, LL_DMA_CHANNEL_3, LL_DMA_MODE_NORMAL);

  LL_DMA_SetPeriphIncMode(DMA1, LL_DMA_CHANNEL_3, LL_DMA_PERIPH_NOINCREMENT);

  LL_DMA_SetMemoryIncMode(DMA1, LL_DMA_CHANNEL_3, LL_DMA_MEMORY_INCREMENT);

  LL_DMA_SetPeriphSize(DMA1, LL_DMA_CHANNEL_3, LL_DMA_PDATAALIGN_BYTE);

  LL_DMA_SetMemorySize(DMA1, LL_DMA_CHANNEL_3, LL_DMA_MDATAALIGN_BYTE);

  /* USER CODE BEGIN I2C3_Init 1 */
  LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_2, (uint32_t)(*pMasterTransmitBuffer), (uint32_t)LL_I2C_DMA_GetRegAddr(I2C3, LL_I2C_DMA_REG_DATA_TRANSMIT), LL_DMA_GetDataTransferDirection(DMA1, LL_DMA_CHANNEL_2));
  LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_3, (uint32_t)LL_I2C_DMA_GetRegAddr(I2C3, LL_I2C_DMA_REG_DATA_RECEIVE), (uint32_t)&(aMasterReceiveBuffer), LL_DMA_GetDataTransferDirection(DMA1, LL_DMA_CHANNEL_3));
  LL_DMA_EnableIT_TC(DMA1, LL_DMA_CHANNEL_2);
  LL_DMA_EnableIT_TE(DMA1, LL_DMA_CHANNEL_2);
  LL_DMA_EnableIT_TC(DMA1, LL_DMA_CHANNEL_3);
  LL_DMA_EnableIT_TE(DMA1, LL_DMA_CHANNEL_3);

  /* USER CODE END I2C3_Init 1 */
  /** I2C Initialization
  */
  I2C_InitStruct.PeripheralMode = LL_I2C_MODE_I2C;
  I2C_InitStruct.Timing = 0x00000102;
  I2C_InitStruct.AnalogFilter = LL_I2C_ANALOGFILTER_ENABLE;
  I2C_InitStruct.DigitalFilter = 0;
  I2C_InitStruct.OwnAddress1 = 0;
  I2C_InitStruct.TypeAcknowledge = LL_I2C_ACK;
  I2C_InitStruct.OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT;
  LL_I2C_Init(I2C3, &I2C_InitStruct);
  LL_I2C_EnableAutoEndMode(I2C3);
  LL_I2C_SetOwnAddress2(I2C3, 0, LL_I2C_OWNADDRESS2_NOMASK);
  LL_I2C_DisableOwnAddress2(I2C3);
  LL_I2C_DisableGeneralCall(I2C3);
  LL_I2C_EnableClockStretching(I2C3);
  /* USER CODE BEGIN I2C3_Init 2 */
  LL_I2C_EnableDMAReq_RX(I2C3);
  LL_I2C_EnableDMAReq_TX(I2C3);
  LL_I2C_Enable(I2C3);
  /* USER CODE END I2C3_Init 2 */

}

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

  /* Init with LL driver */
  /* DMA controller clock enable */
  LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_DMAMUX1);
  LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_DMA1);

  /* DMA interrupt init */
  /* DMA1_Channel2_IRQn interrupt configuration */
  NVIC_SetPriority(DMA1_Channel2_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0));
  NVIC_EnableIRQ(DMA1_Channel2_IRQn);
  /* DMA1_Channel3_IRQn interrupt configuration */
  NVIC_SetPriority(DMA1_Channel3_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0));
  NVIC_EnableIRQ(DMA1_Channel3_IRQn);

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  LL_EXTI_InitTypeDef EXTI_InitStruct = {0};
  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);
  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOC);

  /**/
  LL_GPIO_ResetOutputPin(LED2_GPIO_Port, LED2_Pin);

  /**/
  LL_SYSCFG_SetEXTISource(LL_SYSCFG_EXTI_PORTC, LL_SYSCFG_EXTI_LINE4);

  /**/
  EXTI_InitStruct.Line_0_31 = LL_EXTI_LINE_4;
  EXTI_InitStruct.Line_32_63 = LL_EXTI_LINE_NONE;
  EXTI_InitStruct.LineCommand = ENABLE;
  EXTI_InitStruct.Mode = LL_EXTI_MODE_IT;
  EXTI_InitStruct.Trigger = LL_EXTI_TRIGGER_FALLING;
  LL_EXTI_Init(&EXTI_InitStruct);

  /**/
  LL_GPIO_SetPinPull(User_button_GPIO_Port, User_button_Pin, LL_GPIO_PULL_UP);

  /**/
  LL_GPIO_SetPinMode(User_button_GPIO_Port, User_button_Pin, LL_GPIO_MODE_INPUT);

  /**/
  GPIO_InitStruct.Pin = LED2_Pin;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_OUTPUT;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
  LL_GPIO_Init(LED2_GPIO_Port, &GPIO_InitStruct);

  /* EXTI interrupt init*/
  NVIC_SetPriority(EXTI4_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0));
  NVIC_EnableIRQ(EXTI4_IRQn);

}

/* USER CODE BEGIN 4 */

/**
  * @brief  Flush 8-bit buffer.
  * @param  pBuffer1: pointer to the buffer to be flushed.
  * @retval None
  */
void FlushBuffer8(uint8_t* pBuffer1)
{
  uint8_t Index = 0;

  for (Index = 0; Index < sizeof(pBuffer1); Index++)
  {
    pBuffer1[Index] = 0;
  }
}

/**
  * @brief  Compares two 8-bit buffers and returns the comparison result.
  * @param  pBuffer1: pointer to the source buffer to be compared to.
  * @param  pBuffer2: pointer to the second source buffer to be compared to the first.
  * @param  BufferLength: buffer's length.
  * @retval 0: Comparison is OK (the two Buffers are identical)
  *         Value different from 0: Comparison is NOK (Buffers are different)
  */
uint8_t Buffercmp8(uint8_t* pBuffer1, uint8_t* pBuffer2, uint8_t BufferLength)
{
  while (BufferLength--)
  {
    if (*pBuffer1 != *pBuffer2)
    {
      return 1;
    }

    pBuffer1++;
    pBuffer2++;
  }

  return 0;
}
/**
  * @brief  Turn-on LED2.
  * @param  None
  * @retval None
  */
void LED_On(void)
{
  /* Turn LED2 on */
  LL_GPIO_SetOutputPin(LED2_GPIO_Port, LED2_Pin);
}

/**
  * @brief  Turn-off LED2.
  * @param  None
  * @retval None
  */
void LED_Off(void)
{
  /* Turn LED2 off */
  LL_GPIO_ResetOutputPin(LED2_GPIO_Port, LED2_Pin);
}

/**
  * @brief  Set LED2 to Blinking mode for an infinite loop (toggle period based on value provided as input parameter).
  * @param  Period : Period of time (in ms) between each toggling of LED
  *   This parameter can be user defined values. Pre-defined values used in that example are :   
  *     @arg LED_BLINK_FAST : Fast Blinking
  *     @arg LED_BLINK_SLOW : Slow Blinking
  *     @arg LED_BLINK_ERROR : Error specific Blinking
  * @retval None
  */
void LED_Blinking(uint32_t Period)
{
  /* Turn LED2 on */
  LL_GPIO_SetOutputPin(LED2_GPIO_Port, LED2_Pin);

  /* Toggle IO in an infinite loop */
  while (1)
  {
    LL_GPIO_TogglePin(LED2_GPIO_Port, LED2_Pin);  
    LL_mDelay(Period);
  }
}


/**
  * @brief  Wait for User push-button (SW1) press to start transfer.
  * @param  None 
  * @retval None
  */
  /*  */
void WaitForUserButtonPress(void)
{
  while (ubButtonPress == 0)
  {
    LL_GPIO_TogglePin(LED2_GPIO_Port, LED2_Pin);
    LL_mDelay(LED_BLINK_FAST);
  }
  /* Turn LED2 off */
  LL_GPIO_ResetOutputPin(LED2_GPIO_Port, LED2_Pin);
}

/**
  * @brief  This Function handle Master events to perform a transmission process
  * @note  This function is composed in different steps :
  *        -1- Configure DMA parameters for Command Code transfer.
  *        -2- Enable DMA transfer.
  *        -3- Initiate a Start condition to the Slave device.
  *        -4- Loop until end of DMA transfer completed (DMA TC raised).
  *        -5- Loop until end of master transfer completed (STOP flag raised).
  *        -6- Clear pending flags, Data Command Code are checking into Slave process.
  * @param  None
  * @retval None
  */
void Handle_I2C_Master_Transmit(void)
{
  /* (1) Configure DMA parameters for Command Code transfer *******************/
  pMasterTransmitBuffer    = (uint32_t*)(&aCommandCode[ubMasterCommandIndex][0]);
  ubMasterNbDataToTransmit = strlen((char *)pMasterTransmitBuffer[0]);
  
  LL_DMA_SetMemoryAddress(DMA1, LL_DMA_CHANNEL_2, (uint32_t)(*pMasterTransmitBuffer));
  LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_2, ubMasterNbDataToTransmit);

  /* (2) Enable DMA transfer **************************************************/
  LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_2);
  /* (3) Initiate a Start condition to the Slave device ***********************/

  /* Master Generate Start condition for a write request:
   *  - to the Slave with a 7-Bit SLAVE_OWN_ADDRESS
   *  - with a auto stop condition generation when transmit all bytes
   *  - No specific answer is needed from Slave Device, configure auto-stop condition
   */
  LL_I2C_HandleTransfer(I2C3, SLAVE_OWN_ADDRESS, LL_I2C_ADDRSLAVE_7BIT, ubMasterNbDataToTransmit, LL_I2C_MODE_AUTOEND, LL_I2C_GENERATE_START_WRITE);

  /* (4) Loop until end of transfer completed (DMA TC raised) *****************/

#if (USE_TIMEOUT == 1)
  Timeout = DMA_SEND_TIMEOUT_TC_MS;
#endif /* USE_TIMEOUT */

  /* Loop until DMA transfer complete event */
  while(!ubMasterTransferComplete)
  {
#if (USE_TIMEOUT == 1)
    /* Check Systick counter flag to decrement the time-out value */
    if (LL_SYSTICK_IsActiveCounterFlag()) 
    {
      if(Timeout-- == 0)
      {
        /* Time-out occurred. Set LED to blinking mode */
        LED_Blinking(LED_BLINK_SLOW);
      }
    }
#endif /* USE_TIMEOUT */
  }

  /* (5) Loop until end of master process completed (STOP flag raised) ********/
#if (USE_TIMEOUT == 1)
  Timeout = I2C_SEND_TIMEOUT_STOP_MS;
#endif /* USE_TIMEOUT */

  /* Loop until STOP flag is raised  */
  while(!LL_I2C_IsActiveFlag_STOP(I2C3))
  {
#if (USE_TIMEOUT == 1)
    /* Check Systick counter flag to decrement the time-out value */
    if (LL_SYSTICK_IsActiveCounterFlag()) 
    {
      if(Timeout-- == 0)
      {
        /* Time-out occurred. Set LED2 to blinking mode */
        LED_Blinking(LED_BLINK_SLOW);
      }
    }
#endif /* USE_TIMEOUT */
  }

  /* (6) Clear pending flags, Data Command Code are checking into Slave process */
  /* End of Master Process */
  LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_2);
  LL_I2C_ClearFlag_STOP(I2C3);

  /* Display through external Terminal IO the Slave Answer received */
  printf("%s : %s\n\r", (char*)(aCommandCode[ubMasterCommandIndex][0]), (char*)aMasterReceiveBuffer);

  /* Turn LED2 On */
  /* Master sequence completed successfully*/
  LED_On();
  /* Keep LED2 On, 500 MilliSeconds */
  LL_mDelay(500);
  LED_Off();

  /* Clear and Reset process variables and arrays */
  ubMasterTransferComplete = 0;
  ubMasterNbDataToTransmit = 0;
  ubMasterReceiveIndex     = 0;
  FlushBuffer8(aMasterReceiveBuffer);
}

/**
  * @brief  This Function handle Master events to perform a transmission then a reception process
  * @note   This function is composed in different steps :
  *         -1- Configure DMA parameters for Command Code transfer.
  *         -2- Enable DMA transfer.
  *         -3- Initiate a Start condition to the Slave device.
  *         -4- Loop until end of DMA transfer completed (DMA TC raised).
  *         -5- Loop until end of master transfer completed (TC flag raised).
  *         -6- Configure DMA to receive data from slave.
  *         -7- Initiate a ReStart condition to the Slave device.
  *         -8- Loop until end of master process completed (STOP flag raised).
  *         -9- Clear pending flags, Data Command Code are checking into Slave process.
  * @param  None
  * @retval None
  */
void Handle_I2C_Master_TransmitReceive(void)
{
  /* (1) Configure DMA parameters for Command Code transfer *******************/
  pMasterTransmitBuffer    = (uint32_t*)(&aCommandCode[ubMasterCommandIndex][0]);
  ubMasterNbDataToTransmit = strlen((char *)pMasterTransmitBuffer[0]);

  LL_DMA_SetMemoryAddress(DMA1, LL_DMA_CHANNEL_2, (uint32_t)(*pMasterTransmitBuffer));
  LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_2, ubMasterNbDataToTransmit);

  /* (2) Enable DMA transfer **************************************************/
  LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_2);
  /* (3) Initiate a Start condition to the Slave device ***********************/

  /* Master Generate Start condition for a write request:
   *  - to the Slave with a 7-Bit SLAVE_OWN_ADDRESS
   *  - with a no stop condition generation when transmit all bytes
   *  - A specific answer is needed from Slave Device, configure no-stop condition
   */
  LL_I2C_HandleTransfer(I2C3, SLAVE_OWN_ADDRESS, LL_I2C_ADDRSLAVE_7BIT, ubMasterNbDataToTransmit, LL_I2C_MODE_SOFTEND, LL_I2C_GENERATE_START_WRITE);

  /* (4) Loop until end of transfer completed (DMA TC raised) *****************/

#if (USE_TIMEOUT == 1)
  Timeout = DMA_SEND_TIMEOUT_TC_MS;
#endif /* USE_TIMEOUT */

  /* Loop until DMA transfer complete event */
  while(!ubMasterTransferComplete)
  {
#if (USE_TIMEOUT == 1)
    /* Check Systick counter flag to decrement the time-out value */
    if (LL_SYSTICK_IsActiveCounterFlag()) 
    {
      if(Timeout-- == 0)
      {
        /* Time-out occurred. Set LED to blinking mode */
        LED_Blinking(LED_BLINK_SLOW);
      }
    }
#endif /* USE_TIMEOUT */
  }

  /* Reset ubMasterTransferComplete flag */
  ubMasterTransferComplete = 0;

  /* (5) Loop until end of master transfer completed (TC flag raised) *********/
  /* Wait Master Transfer completed */
#if (USE_TIMEOUT == 1)
  Timeout = I2C_SEND_TIMEOUT_TC_MS;
#endif /* USE_TIMEOUT */

  while(LL_I2C_IsActiveFlag_TC(I2C3) != 1)
  {
#if (USE_TIMEOUT == 1)
    /* Check Systick counter flag to decrement the time-out value */
    if (LL_SYSTICK_IsActiveCounterFlag()) 
    {
      if(Timeout-- == 0)
      {
        /* Time-out occurred. Set LED to blinking mode */
        LED_Blinking(LED_BLINK_SLOW);
      }
    }
#endif /* USE_TIMEOUT */
  }


  /* (6) Configure DMA to receive data from slave *****************************/
  LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_2);
  LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_3, ubMasterNbDataToReceive);
  LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_3);

  /* (7) Initiate a ReStart condition to the Slave device *********************/
  /* Master Generate Start condition for a write request:
   *    - to the Slave with a 7-Bit SLAVE_OWN_ADDRESS
   *    - with a auto stop condition generation when transmit all bytes
   */
  LL_I2C_HandleTransfer(I2C3, SLAVE_OWN_ADDRESS, LL_I2C_ADDRSLAVE_7BIT, ubMasterNbDataToReceive, LL_I2C_MODE_AUTOEND, LL_I2C_GENERATE_RESTART_7BIT_READ);

  /* (8) Loop until end of master process completed (STOP flag raised) ********/
#if (USE_TIMEOUT == 1)
  Timeout = I2C_SEND_TIMEOUT_STOP_MS;
#endif /* USE_TIMEOUT */

  /* Loop until STOP flag is raised  */
  while(!LL_I2C_IsActiveFlag_STOP(I2C3))
  {
#if (USE_TIMEOUT == 1)
    /* Check Systick counter flag to decrement the time-out value */
    if (LL_SYSTICK_IsActiveCounterFlag()) 
    {
      if(Timeout-- == 0)
      {
        /* Time-out occurred. Set LED2 to blinking mode */
        LED_Blinking(LED_BLINK_SLOW);
      }
    }
#endif /* USE_TIMEOUT */
  }

  /* (9) Clear pending flags, Data Command Code are checking into Slave process */
  /* End of Master Process */
  LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_3);
  LL_I2C_ClearFlag_STOP(I2C3);

  /* Display through external Terminal IO the Slave Answer received */
  printf("%s : %s\n\r", (char*)(aCommandCode[ubMasterCommandIndex][0]), (char*)aMasterReceiveBuffer);

  /* Turn LED2 On */
  /* Master sequence completed successfully*/
  LED_On();
  /* Keep LED2 On, 500 MilliSeconds */
  LL_mDelay(500);
  LED_Off();

  /* Clear and Reset process variables and arrays */
  ubMasterTransferComplete = 0;
  ubMasterNbDataToTransmit = 0;
  ubMasterReceiveIndex     = 0;
  FlushBuffer8(aMasterReceiveBuffer);
}
/******************************************************************************/
/*   IRQ HANDLER TREATMENT Functions                                          */
/******************************************************************************/
/**
  * @brief  Function to manage User push-button (SW1)
  * @param  None
  * @retval None
  */
void UserButton_Callback(void)
{
  /* Update User push-button (SW1) variable : to be checked in waiting loop in main program */
  ubButtonPress = 1;
}

/**
  * @brief  Function called from I2C IRQ Handler when TXIS flag is set
  *         Function is in charge of transmit a byte on I2C lines.
  * @param  None
  * @retval None
  */
void Slave_Ready_To_Transmit_Callback(void)
{
  /* Send the Byte requested by the Master */
  LL_I2C_TransmitData8(I2C1, (uint8_t)(*pSlaveTransmitBuffer++));
}

/**
  * @brief  Function called from I2C IRQ Handler when RXNE flag is set
  *         Function is in charge of retrieving received byte on I2C lines.
  * @param  None
  * @retval None
  */
void Slave_Reception_Callback(void)
{
  /* Read character in Receive Data register.
  RXNE flag is cleared by reading data in RXDR register */
  aSlaveReceiveBuffer[ubSlaveReceiveIndex++] = LL_I2C_ReceiveData8(I2C1);

  /* Check Command code */
  if(Buffercmp8((uint8_t*)aSlaveReceiveBuffer, (uint8_t*)(aCommandCode[0][0]), (ubSlaveReceiveIndex-1)) == 0)
  {
    ubSlaveInfoIndex = SLAVE_CHIP_NAME;
    pSlaveTransmitBuffer = (uint8_t*)(aSlaveInfo[ubSlaveInfoIndex]);
  }
  else if(Buffercmp8((uint8_t*)aSlaveReceiveBuffer, (uint8_t*)(aCommandCode[1][0]), (ubSlaveReceiveIndex-1)) == 0)
  {
    ubSlaveInfoIndex = SLAVE_CHIP_REVISION;
    pSlaveTransmitBuffer = (uint8_t*)(aSlaveInfo[ubSlaveInfoIndex]);
  }
}

/**
  * @brief  Function called from I2C IRQ Handler when STOP flag is set
  *         Function is in charge of checking data received,
  *         LED2 is On if data are correct.
  * @param  None
  * @retval None
  */
void Slave_Complete_Callback(void)
{
  /* Clear and Reset process variables and arrays */
  ubSlaveReceiveIndex       = 0;
  ubSlaveReceiveComplete    = 0;
  FlushBuffer8(aSlaveReceiveBuffer);
}

/**
  * @brief  DMA transfer complete callback
  * @note   This function is executed when the transfer complete interrupt
  *         is generated
  * @retval None
  */
void Transfer_Complete_Callback()
{
  /* DMA transfer completed */
  ubMasterTransferComplete = 1;
}

/**
  * @brief  DMA transfer error callback
  * @note   This function is executed when the transfer error interrupt
  *         is generated during DMA transfer
  * @retval None
  */
void Transfer_Error_Callback()
{
  /* Disable DMA1_Channel2_IRQn */
  NVIC_DisableIRQ(DMA1_Channel2_IRQn);
                  
  /* Error detected during DMA transfer */
  LED_Blinking(LED_BLINK_ERROR);
}

/**
  * @brief  Function called in case of error detected in I2C IT Handler
  * @param  None
  * @retval None
  */
void Error_Callback(void)
{
  /* Disable I2C1_EV_IRQn */
  NVIC_DisableIRQ(I2C1_EV_IRQn);

  /* Disable I2C1_ER_IRQn */
  NVIC_DisableIRQ(I2C1_ER_IRQn);

  /* Unexpected event : Set LED2 to Blinking mode to indicate error occurs */
  LED_Blinking(LED_BLINK_ERROR);
}

/* 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 */
 
  /* 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,
     tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */