/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    Examples_LL/USART/USART_SyncCommunication_FullDuplex_DMA_Init/Src/main.c
  * @author  MCD Application Team
  * @brief   This example describes how to transfer bytes from/to an USART peripheral
  *          to/from an SPI peripheral (in slave mode) using DMA mode
  *          through the STM32WLxx USART LL API.
  *          Peripheral initialization done using LL unitary services functions.
  ******************************************************************************
  * @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 */

/* USER CODE END PD */

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

/* USER CODE END PM */

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

/* USER CODE BEGIN PV */
__IO uint8_t ubButtonPress = 0;

/* Buffer used for transmission */
uint8_t aUSART1TxBuffer[] = "**** USART_SyncCommunication_FullDuplex_DMA_Init USART1 to SPI1 communication ****";
uint8_t ubUSART1NbDataToTransmit = sizeof(aUSART1TxBuffer);
__IO uint8_t ubUSART1TransmissionComplete = 0;
uint8_t aSPI1TxBuffer[] = "**** USART_SyncCommunication_FullDuplex_DMA_Init SPI1 to USART1 communication ****";
uint8_t ubSPI1NbDataToTransmit = sizeof(aSPI1TxBuffer);
__IO uint8_t ubSPI1TransmissionComplete = 0;

/* Buffer used for reception */
uint8_t aUSART1RxBuffer[sizeof(aSPI1TxBuffer)];
uint8_t ubUSART1NbDataToReceive = sizeof(aSPI1TxBuffer);
__IO uint8_t ubUSART1ReceptionComplete = 0;
uint8_t aSPI1RxBuffer[sizeof(aUSART1TxBuffer)];
uint8_t ubSPI1NbDataToReceive = sizeof(aUSART1TxBuffer);
__IO uint8_t ubSPI1ReceptionComplete = 0;

/* 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_USART1_Init(void);
static void MX_SPI1_Init(void);
/* USER CODE BEGIN PFP */
void     Activate_SPI1(void);
void     StartTransfers(void);
void     LED_On(void);
void     LED_Blinking(uint32_t Period);
void     LED_Off(void);
void     WaitForUserButtonPress(void);
void     WaitAndCheckEndOfTransfer(void);
uint8_t  Buffercmp8(uint8_t *pBuffer1, uint8_t *pBuffer2, uint8_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 */
  /* USER CODE END 1 */

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

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

  /* System interrupt init*/
  NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);

  /* 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_USART1_Init();
  MX_SPI1_Init();
  /* USER CODE BEGIN 2 */

  /* Enable the SPI1 peripheral */
  Activate_SPI1();

  /* Wait for User push-button (B1) press to start transfer */
  WaitForUserButtonPress();

  /* Initiate DMA transfers */
  StartTransfers();

  /* Wait for the end of the transfer and check received data */
  WaitAndCheckEndOfTransfer();

  /* 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)
{
  LL_FLASH_SetLatency(LL_FLASH_LATENCY_2);
  while(LL_FLASH_GetLatency() != LL_FLASH_LATENCY_2)
  {
  }

  LL_PWR_SetRegulVoltageScaling(LL_PWR_REGU_VOLTAGE_SCALE1);
  LL_RCC_MSI_Enable();

   /* Wait till MSI is ready */
  while(LL_RCC_MSI_IsReady() != 1)
  {
  }

  LL_RCC_MSI_EnableRangeSelection();
  LL_RCC_MSI_SetRange(LL_RCC_MSIRANGE_11);
  LL_RCC_MSI_SetCalibTrimming(0);
  LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_MSI);

   /* Wait till System clock is ready */
  while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_MSI)
  {
  }

  LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
  LL_RCC_SetAHB3Prescaler(LL_RCC_SYSCLK_DIV_1);
  LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_1);
  LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);

  LL_Init1msTick(48000000);

  /* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
  LL_SetSystemCoreClock(48000000);
}

/**
  * @brief SPI1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_SPI1_Init(void)
{

  /* USER CODE BEGIN SPI1_Init 0 */

  /* USER CODE END SPI1_Init 0 */

  LL_SPI_InitTypeDef SPI_InitStruct = {0};

  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* Peripheral clock enable */
  LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_SPI1);

  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);
  /**SPI1 GPIO Configuration
  PB3   ------> SPI1_SCK
  PB4   ------> SPI1_MISO
  PB5   ------> SPI1_MOSI
  */
  GPIO_InitStruct.Pin = LL_GPIO_PIN_3|LL_GPIO_PIN_4|LL_GPIO_PIN_5;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_DOWN;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_5;
  LL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /* SPI1 DMA Init */

  /* SPI1_TX Init */
  LL_DMA_SetPeriphRequest(DMA1, LL_DMA_CHANNEL_2, LL_DMAMUX_REQ_SPI1_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);

  LL_DMA_DisableChannelPrivilege(DMA1, LL_DMA_CHANNEL_2);

  /* SPI1_RX Init */
  LL_DMA_SetPeriphRequest(DMA1, LL_DMA_CHANNEL_3, LL_DMAMUX_REQ_SPI1_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);

  LL_DMA_DisableChannelPrivilege(DMA1, LL_DMA_CHANNEL_3);

  /* USER CODE BEGIN SPI1_Init 1 */
  /* (3) Configure the DMA1 functional parameters for transmission */
  LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_2,
                         (uint32_t)aSPI1TxBuffer,
                         (uint32_t)&(SPI1->DR),
                         LL_DMA_GetDataTransferDirection(DMA1, LL_DMA_CHANNEL_2));
  LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_2, ubSPI1NbDataToTransmit);

  /* (4) Configure the DMA functional parameters for reception */
  LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_3,
                         (uint32_t)&(SPI1->DR),
                         (uint32_t)aSPI1RxBuffer,
                         LL_DMA_GetDataTransferDirection(DMA1, LL_DMA_CHANNEL_3));
  LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_3, ubSPI1NbDataToReceive);
  /* (5) Enable DMA transfer complete/error interrupts  */
  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 SPI1_Init 1 */
  /* SPI1 parameter configuration*/
  SPI_InitStruct.TransferDirection = LL_SPI_FULL_DUPLEX;
  SPI_InitStruct.Mode = LL_SPI_MODE_SLAVE;
  SPI_InitStruct.DataWidth = LL_SPI_DATAWIDTH_8BIT;
  SPI_InitStruct.ClockPolarity = LL_SPI_POLARITY_LOW;
  SPI_InitStruct.ClockPhase = LL_SPI_PHASE_2EDGE;
  SPI_InitStruct.NSS = LL_SPI_NSS_SOFT;
  SPI_InitStruct.BitOrder = LL_SPI_LSB_FIRST;
  SPI_InitStruct.CRCCalculation = LL_SPI_CRCCALCULATION_DISABLE;
  SPI_InitStruct.CRCPoly = 7;
  LL_SPI_Init(SPI1, &SPI_InitStruct);
  LL_SPI_SetStandard(SPI1, LL_SPI_PROTOCOL_MOTOROLA);
  LL_SPI_DisableNSSPulseMgt(SPI1);
  /* USER CODE BEGIN SPI1_Init 2 */
  LL_SPI_SetRxFIFOThreshold(SPI1, LL_SPI_RX_FIFO_TH_QUARTER);

  /* Configure SPI1 DMA transfer interrupts */
  /* Enable DMA TX Interrupt */
  LL_SPI_EnableDMAReq_TX(SPI1);
  /* Enable DMA RX Interrupt */
  LL_SPI_EnableDMAReq_RX(SPI1);
  /* USER CODE END SPI1_Init 2 */

}

/**
  * @brief USART1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_USART1_Init(void)
{

  /* USER CODE BEGIN USART1_Init 0 */

  /* USER CODE END USART1_Init 0 */

  LL_USART_InitTypeDef USART_InitStruct = {0};
  LL_USART_ClockInitTypeDef USART_ClockInitStruct = {0};

  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};

  LL_RCC_SetUSARTClockSource(LL_RCC_USART1_CLKSOURCE_PCLK2);

  /* Peripheral clock enable */
  LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_USART1);

  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOA);
  /**USART1 GPIO Configuration
  PA10   ------> USART1_RX
  PA9   ------> USART1_TX
  PA8   ------> USART1_CK
  */
  GPIO_InitStruct.Pin = LL_GPIO_PIN_10|LL_GPIO_PIN_9|LL_GPIO_PIN_8;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
  GPIO_InitStruct.Pull = LL_GPIO_PULL_DOWN;
  GPIO_InitStruct.Alternate = LL_GPIO_AF_7;
  LL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* USART1 DMA Init */

  /* USART1_TX Init */
  LL_DMA_SetPeriphRequest(DMA1, LL_DMA_CHANNEL_4, LL_DMAMUX_REQ_USART1_TX);

  LL_DMA_SetDataTransferDirection(DMA1, LL_DMA_CHANNEL_4, LL_DMA_DIRECTION_MEMORY_TO_PERIPH);

  LL_DMA_SetChannelPriorityLevel(DMA1, LL_DMA_CHANNEL_4, LL_DMA_PRIORITY_HIGH);

  LL_DMA_SetMode(DMA1, LL_DMA_CHANNEL_4, LL_DMA_MODE_NORMAL);

  LL_DMA_SetPeriphIncMode(DMA1, LL_DMA_CHANNEL_4, LL_DMA_PERIPH_NOINCREMENT);

  LL_DMA_SetMemoryIncMode(DMA1, LL_DMA_CHANNEL_4, LL_DMA_MEMORY_INCREMENT);

  LL_DMA_SetPeriphSize(DMA1, LL_DMA_CHANNEL_4, LL_DMA_PDATAALIGN_BYTE);

  LL_DMA_SetMemorySize(DMA1, LL_DMA_CHANNEL_4, LL_DMA_MDATAALIGN_BYTE);

  LL_DMA_DisableChannelPrivilege(DMA1, LL_DMA_CHANNEL_4);

  /* USART1_RX Init */
  LL_DMA_SetPeriphRequest(DMA1, LL_DMA_CHANNEL_5, LL_DMAMUX_REQ_USART1_RX);

  LL_DMA_SetDataTransferDirection(DMA1, LL_DMA_CHANNEL_5, LL_DMA_DIRECTION_PERIPH_TO_MEMORY);

  LL_DMA_SetChannelPriorityLevel(DMA1, LL_DMA_CHANNEL_5, LL_DMA_PRIORITY_HIGH);

  LL_DMA_SetMode(DMA1, LL_DMA_CHANNEL_5, LL_DMA_MODE_NORMAL);

  LL_DMA_SetPeriphIncMode(DMA1, LL_DMA_CHANNEL_5, LL_DMA_PERIPH_NOINCREMENT);

  LL_DMA_SetMemoryIncMode(DMA1, LL_DMA_CHANNEL_5, LL_DMA_MEMORY_INCREMENT);

  LL_DMA_SetPeriphSize(DMA1, LL_DMA_CHANNEL_5, LL_DMA_PDATAALIGN_BYTE);

  LL_DMA_SetMemorySize(DMA1, LL_DMA_CHANNEL_5, LL_DMA_MDATAALIGN_BYTE);

  LL_DMA_DisableChannelPrivilege(DMA1, LL_DMA_CHANNEL_5);

  /* USER CODE BEGIN USART1_Init 1 */

  LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_4,
                         (uint32_t)aUSART1TxBuffer,
                         LL_USART_DMA_GetRegAddr(USART1, LL_USART_DMA_REG_DATA_TRANSMIT),
                         LL_DMA_GetDataTransferDirection(DMA1, LL_DMA_CHANNEL_4));
  LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_4, ubUSART1NbDataToTransmit);
  LL_DMA_ConfigAddresses(DMA1, LL_DMA_CHANNEL_5,
                         LL_USART_DMA_GetRegAddr(USART1, LL_USART_DMA_REG_DATA_RECEIVE),
                         (uint32_t)aUSART1RxBuffer,
                         LL_DMA_GetDataTransferDirection(DMA1, LL_DMA_CHANNEL_5));
  LL_DMA_SetDataLength(DMA1, LL_DMA_CHANNEL_5, ubUSART1NbDataToReceive);
  LL_DMA_EnableIT_TC(DMA1, LL_DMA_CHANNEL_4);
  LL_DMA_EnableIT_TE(DMA1, LL_DMA_CHANNEL_4);
  LL_DMA_EnableIT_TC(DMA1, LL_DMA_CHANNEL_5);
  LL_DMA_EnableIT_TE(DMA1, LL_DMA_CHANNEL_5);
  /* USER CODE END USART1_Init 1 */
  USART_InitStruct.PrescalerValue = LL_USART_PRESCALER_DIV1;
  USART_InitStruct.BaudRate = 115200;
  USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B;
  USART_InitStruct.StopBits = LL_USART_STOPBITS_1;
  USART_InitStruct.Parity = LL_USART_PARITY_NONE;
  USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX_RX;
  USART_InitStruct.OverSampling = LL_USART_OVERSAMPLING_8;

  LL_USART_Init(USART1, &USART_InitStruct);
  LL_USART_SetTXFIFOThreshold(USART1, LL_USART_FIFOTHRESHOLD_1_4);
  LL_USART_SetRXFIFOThreshold(USART1, LL_USART_FIFOTHRESHOLD_1_4);
  USART_ClockInitStruct.ClockOutput = LL_USART_CLOCK_ENABLE;
  USART_ClockInitStruct.ClockPolarity = LL_USART_POLARITY_LOW;
  USART_ClockInitStruct.ClockPhase = LL_USART_PHASE_2EDGE;
  USART_ClockInitStruct.LastBitClockPulse = LL_USART_LASTCLKPULSE_OUTPUT;
  LL_USART_ClockInit(USART1, &USART_ClockInitStruct);
  LL_USART_DisableFIFO(USART1);
  LL_USART_ConfigSyncMode(USART1);

  /* USER CODE BEGIN WKUPType USART1 */

  /* USER CODE END WKUPType USART1 */

  LL_USART_Enable(USART1);

  /* Polling USART1 initialisation */
  while((!(LL_USART_IsActiveFlag_TEACK(USART1))) || (!(LL_USART_IsActiveFlag_REACK(USART1))))
  {
  }
  /* USER CODE BEGIN USART1_Init 2 */
  /* USER CODE END USART1_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);
  /* DMA1_Channel4_IRQn interrupt configuration */
  NVIC_SetPriority(DMA1_Channel4_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0));
  NVIC_EnableIRQ(DMA1_Channel4_IRQn);
  /* DMA1_Channel5_IRQn interrupt configuration */
  NVIC_SetPriority(DMA1_Channel5_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0));
  NVIC_EnableIRQ(DMA1_Channel5_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_GPIOA);

  /**/
  LL_GPIO_ResetOutputPin(LED2_GPIO_Port, LED2_Pin);

  /**/
  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);

  /**/
  LL_SYSCFG_SetEXTISource(LL_SYSCFG_EXTI_PORTA, LL_SYSCFG_EXTI_LINE0);

  /**/
  EXTI_InitStruct.Line_0_31 = LL_EXTI_LINE_0;
  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);

  /* EXTI interrupt init*/
  NVIC_SetPriority(EXTI0_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0));
  NVIC_EnableIRQ(EXTI0_IRQn);

}

/* USER CODE BEGIN 4 */

/**
  * @brief  This function Activate SPI1
  * @param  None
  * @retval None
  */
void Activate_SPI1(void)
{
  /* Enable SPI1 */
  LL_SPI_Enable(SPI1);

  /* Enable DMA Channels Tx and Rx */
  LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_2);
  LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_3);
}

/**
  * @brief  This function initiates TX and RX DMA transfers by enabling DMA channels
  * @param  None
  * @retval None
  */
void StartTransfers(void)
{
  /* Enable DMA RX Interrupt */
  LL_USART_EnableDMAReq_RX(USART1);

  /* Enable DMA TX Interrupt */
  LL_USART_EnableDMAReq_TX(USART1);

  /* Enable DMA Channel Rx */
  LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_5);

  /* Enable DMA Channel Tx */
  LL_DMA_EnableChannel(DMA1, LL_DMA_CHANNEL_4);
}

/**
  * @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)
{
  /* Toggle LED2 in an infinite loop */
  while (1)
  {
    LL_GPIO_TogglePin(LED2_GPIO_Port, LED2_Pin);
    LL_mDelay(Period);
  }
}

/**
  * @brief  Wait for User push-button (B1) 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);
  }
  /* Ensure that LED2 is turned Off */
  LED_Off();
}

/**
  * @brief  Wait end of transfer and check if received Data are well.
  * @param  None
  * @retval None
  */
void WaitAndCheckEndOfTransfer(void)
{
  /* 1 - Wait end of transmission from USART1 */
  while (ubUSART1TransmissionComplete != 1)
  {
  }
  /* Disable DMA1 Tx Channel */
  LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_4);

  /* 2 - Wait end of transmission from SPI1 */
  while (ubSPI1TransmissionComplete != 1)
  {
  }
  /* Disable DMA1 Tx Channel */
  LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_2);

  /* 3 - Wait end of reception from USART1 */
  while (ubUSART1ReceptionComplete != 1)
  {
  }
  /* Disable DMA1 Rx Channel */
  LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_5);

  /* 4 - Wait end of reception from SPI1 */
  while (ubSPI1ReceptionComplete != 1)
  {
  }
  /* Disable DMA1 Rx Channel */
  LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_3);

  /* 5 - Compare received data to transmitted one (USART1 => SPI1) */
  if (Buffercmp8((uint8_t *)aUSART1TxBuffer, (uint8_t *)aSPI1RxBuffer, ubUSART1NbDataToTransmit))
  {
    /* Processing Error */
    LED_Blinking(LED_BLINK_ERROR);
  }
  /* 6 - Compare received data to transmitted one (SPI1 => USART1) */
  else if (Buffercmp8((uint8_t *)aSPI1TxBuffer, (uint8_t *)aUSART1RxBuffer, ubSPI1NbDataToTransmit))
  {
    /* Processing Error */
    LED_Blinking(LED_BLINK_ERROR);
  }
  else
  {
    /* Turn On Led if data are well received */
    LED_On();
  }
}

/**
* @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;
}


/******************************************************************************/
/*   USER IRQ HANDLER TREATMENT Functions                                     */
/******************************************************************************/
/**
  * @brief  Function to manage User push-button (B1)
  * @param  None
  * @retval None
  */
void UserButton_Callback(void)
{
  /* Update User push-button (B1) variable : to be checked in waiting loop in main program */
  ubButtonPress = 1;
}

/**
  * @brief  Function called from DMA1 IRQ Handler when Tx transfer is completed (USART1)
  * @param  None
  * @retval None
  */
void USART1_DMA1_TransmitComplete_Callback(void)
{
  /* DMA Tx transfer completed */
  ubUSART1TransmissionComplete = 1;
}

/**
  * @brief  Function called from DMA1 IRQ Handler when Tx transfer is completed (SPI1)
  * @param  None
  * @retval None
  */
void SPI1_DMA1_TransmitComplete_Callback(void)
{
  /* DMA Tx transfer completed */
  ubSPI1TransmissionComplete = 1;
}

/**
  * @brief  Function called from DMA1 IRQ Handler when Rx transfer is completed (USART1)
  * @param  None
  * @retval None
  */
void USART1_DMA1_ReceiveComplete_Callback(void)
{
  /* DMA Rx transfer completed */
  ubUSART1ReceptionComplete = 1;
}

/**
  * @brief  Function called from DMA1 IRQ Handler when Rx transfer is completed (SPI1)
  * @param  None
  * @retval None
  */
void SPI1_DMA1_ReceiveComplete_Callback(void)
{
  /* DMA Rx transfer completed */
  ubSPI1ReceptionComplete = 1;
}

/**
  * @brief  Function called in case of error detected in USART IT Handler
  * @param  None
  * @retval None
  */
void USART_TransferError_Callback(void)
{
  /* Disable DMA1 Tx Channel */
  LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_4);

  /* Disable DMA1 Rx Channel */
  LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_5);

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

/**
  * @brief  Function called in case of error detected in SPI IT Handler
  * @param  None
  * @retval None
  */
void SPI_TransferError_Callback(void)
{
  /* Disable DMA1 Tx Channel */
  LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_2);

  /* Disable DMA1 Rx Channel */
  LL_DMA_DisableChannel(DMA1, LL_DMA_CHANNEL_3);

  /* 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 */
