/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2026 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 */
#define BUFFER_SIZE 128
uint16_t DAC_Buffer[BUFFER_SIZE * 2];
uint16_t ADC_Buffer[BUFFER_SIZE * 2];

/* USER CODE END PD */

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

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef hadc1;
DMA_HandleTypeDef hdma_adc1;

DAC_HandleTypeDef hdac;
DMA_HandleTypeDef hdma_dac1;

TIM_HandleTypeDef htim3;
TIM_HandleTypeDef htim4;

/* USER CODE BEGIN PV */
float f_x0, f_x1, f_x2, f_y0, f_y1, f_y2;
float s_x0, s_x1, s_x2, s_y0, s_y1, s_y2;

///// 1st biquad
/*
//Parts Name: Low Shelving Filter
//Parts Number: U_13
//Sampling Frequency =    48000.0
//Cutoff =    1000.00
//Gain =       10.0
//Slope =   1.0000
float f_a0 =   1.05534097467;
float f_a1 =  -1.85154816143;
float f_a2 =   0.82471431803;
float f_b1 =  -1.86129435385;
float f_b2 =   0.87030910028;
*/
/*
//Parts Name: High Shelving Filter
//Parts Number: U_12
//Sampling Frequency =    48000.0
//Cutoff =    1000.00
//Gain =       10.0
//Slope =   1.0000
float f_a0 =   2.99645113387;
float f_a1 =  -5.57727757705;
float f_a2 =   2.60783869036;
float f_b1 =  -1.75445491635;
float f_b2 =   0.78146716353;
*/

//Parts Name: Notch Filter
//Parts Number: U_11
//Sampling Frequency =    48000.0
//Cutoff =    1000.00
//Q =   5.0000
float f_a0 =   0.98711556719;
float f_a1 =  -1.95734134185;
float f_a2 =   0.98711556719;
float f_b1 =  -1.95734134185;
float f_b2 =   0.97423113439;

///// 2nd biquad
/*
// through filter
float s_a0 =  1;
float s_a1 =  0;
float s_a2 =  0;
float s_b1 =  0;
float s_b2 =  0;
*/

//Parts Name: Peaking Filter
//Parts Number: U_14
//Sampling Frequency =    48000.0
//Cutoff =    4000.00
//Gain =       10.0
//Q =   5.0000
float s_a0 =   1.05913417931;
float s_a1 =  -1.68468294415;
float s_a2 =   0.88616962659;
float s_b1 =  -1.68468294415;
float s_b2 =   0.94530380589;

#define TAPN 150
int PTR = 0;

float dly[TAPN];

float coeff[TAPN] = {
		//Graphic Equalizer
		//Sampling Frequency =   48000.0
		//gain0 =     0.000
		//gain1 =   -30.000
		//gain2 =   -30.000
		//gain3 =     5.000
		//gain4 =     5.000
		//gain5 =   -50.000
		//gain6 =   -50.000
		//gain7 =   -20.000
		//gain8 =   -20.000
		//gain9 =   -20.000
		//Tap Count =150
		 -0.00004269025,
		  0.00004863193,
		  0.00004129032,
		 -0.00003101451,
		 -0.00000001875,
		  0.00004829009,
		 -0.00010107534,
		 -0.00019020459,
		  0.00027453658,
		  0.00078749460,
		  0.00038075104,
		 -0.00036614159,
		 -0.00027144420,
		  0.00018207703,
		 -0.00000002806,
		 -0.00023773159,
		  0.00046256524,
		  0.00081658961,
		 -0.00111340364,
		 -0.00303182586,
		 -0.00139829465,
		  0.00128725631,
		  0.00091688798,
		 -0.00059321242,
		 -0.00000022513,
		  0.00072419021,
		 -0.00136868880,
		 -0.00234927555,
		  0.00311936174,
		  0.00828736584,
		  0.00373389874,
		 -0.00336404323,
		 -0.00234722390,
		  0.00148823147,
		 -0.00000014503,
		 -0.00175430390,
		  0.00325947201,
		  0.00550913116,
		 -0.00721154751,
		 -0.01889723435,
		 -0.00840617430,
		  0.00748223729,
		  0.00516258858,
		 -0.00324159087,
		 -0.00000071796,
		  0.00375101604,
		 -0.00691971068,
		 -0.01161652022,
		  0.01511710741,
		  0.03942677197,
		  0.01747279901,
		 -0.01551651447,
		 -0.01069219186,
		  0.00671098764,
		 -0.00000032438,
		 -0.00780412087,
		  0.01446100124,
		  0.02444277648,
		 -0.03210415577,
		 -0.08470594821,
		 -0.03809307668,
		  0.03444609549,
		  0.02427097387,
		 -0.01565959972,
		 -0.00000119733,
		  0.01961594165,
		 -0.03825229275,
		 -0.06889931411,
		  0.09811385869,
		  0.28757682569,
		  0.14899248702,
		 -0.16475394840,
		 -0.15874632566,
		  0.18544266634,
		  0.49261289286,
		  0.18544266634,
		 -0.15874632566,
		 -0.16475394840,
		  0.14899248702,
		  0.28757682569,
		  0.09811385869,
		 -0.06889931411,
		 -0.03825229275,
		  0.01961594165,
		 -0.00000119733,
		 -0.01565959972,
		  0.02427097387,
		  0.03444609549,
		 -0.03809307668,
		 -0.08470594821,
		 -0.03210415577,
		  0.02444277648,
		  0.01446100124,
		 -0.00780412087,
		 -0.00000032438,
		  0.00671098764,
		 -0.01069219186,
		 -0.01551651447,
		  0.01747279901,
		  0.03942677197,
		  0.01511710741,
		 -0.01161652022,
		 -0.00691971068,
		  0.00375101604,
		 -0.00000071796,
		 -0.00324159087,
		  0.00516258858,
		  0.00748223729,
		 -0.00840617430,
		 -0.01889723435,
		 -0.00721154751,
		  0.00550913116,
		  0.00325947201,
		 -0.00175430390,
		 -0.00000014503,
		  0.00148823147,
		 -0.00234722390,
		 -0.00336404323,
		  0.00373389874,
		  0.00828736584,
		  0.00311936174,
		 -0.00234927555,
		 -0.00136868880,
		  0.00072419021,
		 -0.00000022513,
		 -0.00059321242,
		  0.00091688798,
		  0.00128725631,
		 -0.00139829465,
		 -0.00303182586,
		 -0.00111340364,
		  0.00081658961,
		  0.00046256524,
		 -0.00023773159,
		 -0.00000002806,
		  0.00018207703,
		 -0.00027144420,
		 -0.00036614159,
		  0.00038075104,
		  0.00078749460,
		  0.00027453658,
		 -0.00019020459,
		 -0.00010107534,
		  0.00004829009,
		 -0.00000001875,
		 -0.00003101451,
		  0.00004129032,
		  0.00004863193,
		 -0.00004269025,
		  0.00000000000
};

/*
float coeff[TAPN] = {
		//Parametric Equalizer
		//Sampling Frequency =   48000.0
		//fc0 =          0.000 [Hz]
		//fc1 =       3984.000 [Hz]
		//fc2 =       7968.000 [Hz]
		//fc3 =      12000.000 [Hz]
		//fc4 =      15984.000 [Hz]
		//gain0 =     0.000
		//gain1 =   -40.000
		//gain2 =   -10.000
		//gain3 =     5.000
		//gain4 =   -20.000
		//Tap Count =150
		 -0.00001621710,
		  0.00000789697,
		 -0.00003191826,
		 -0.00000325585,
		  0.00005186686,
		 -0.00026385018,
		 -0.00020234880,
		  0.00034599011,
		 -0.00000552914,
		 -0.00025702861,
		  0.00055039922,
		  0.00039102645,
		 -0.00020602430,
		  0.00008135938,
		 -0.00023061122,
		 -0.00003871228,
		  0.00037110911,
		 -0.00160759046,
		 -0.00125595414,
		  0.00180008339,
		 -0.00002073111,
		 -0.00133035329,
		  0.00250541089,
		  0.00184976339,
		 -0.00089257674,
		  0.00032559920,
		 -0.00070638861,
		 -0.00018975842,
		  0.00136143974,
		 -0.00533999132,
		 -0.00444513051,
		  0.00560789560,
		 -0.00004656481,
		 -0.00442353387,
		  0.00753725644,
		  0.00592613351,
		 -0.00267366607,
		  0.00091268958,
		 -0.00147735324,
		 -0.00063726831,
		  0.00374646385,
		 -0.01356196497,
		 -0.01217083992,
		  0.01378485315,
		 -0.00007837039,
		 -0.01193248033,
		  0.01861731386,
		  0.01577287015,
		 -0.00672059532,
		  0.00215538085,
		 -0.00238697712,
		 -0.00179318083,
		  0.00914149678,
		 -0.03105175673,
		 -0.03039882779,
		  0.03151738985,
		 -0.00010741235,
		 -0.03096236850,
		  0.04500102851,
		  0.04190789372,
		 -0.01720454445,
		  0.00526510936,
		 -0.00313583262,
		 -0.00545764664,
		  0.02577278174,
		 -0.08610826398,
		 -0.09678950436,
		  0.09834444715,
		 -0.00012469685,
		 -0.13184112677,
		  0.20462869042,
		  0.25493134700,
		 -0.13666251887,
		  0.07083600328,
		  0.54732482288,
		  0.07083600328,
		 -0.13666251887,
		  0.25493134700,
		  0.20462869042,
		 -0.13184112677,
		 -0.00012469685,
		  0.09834444715,
		 -0.09678950436,
		 -0.08610826398,
		  0.02577278174,
		 -0.00545764664,
		 -0.00313583262,
		  0.00526510936,
		 -0.01720454445,
		  0.04190789372,
		  0.04500102851,
		 -0.03096236850,
		 -0.00010741235,
		  0.03151738985,
		 -0.03039882779,
		 -0.03105175673,
		  0.00914149678,
		 -0.00179318083,
		 -0.00238697712,
		  0.00215538085,
		 -0.00672059532,
		  0.01577287015,
		  0.01861731386,
		 -0.01193248033,
		 -0.00007837039,
		  0.01378485315,
		 -0.01217083992,
		 -0.01356196497,
		  0.00374646385,
		 -0.00063726831,
		 -0.00147735324,
		  0.00091268958,
		 -0.00267366607,
		  0.00592613351,
		  0.00753725644,
		 -0.00442353387,
		 -0.00004656481,
		  0.00560789560,
		 -0.00444513051,
		 -0.00533999132,
		  0.00136143974,
		 -0.00018975842,
		 -0.00070638861,
		  0.00032559920,
		 -0.00089257674,
		  0.00184976339,
		  0.00250541089,
		 -0.00133035329,
		 -0.00002073111,
		  0.00180008339,
		 -0.00125595414,
		 -0.00160759046,
		  0.00037110911,
		 -0.00003871228,
		 -0.00023061122,
		  0.00008135938,
		 -0.00020602430,
		  0.00039102645,
		  0.00055039922,
		 -0.00025702861,
		 -0.00000552914,
		  0.00034599011,
		 -0.00020234880,
		 -0.00026385018,
		  0.00005186686,
		 -0.00000325585,
		 -0.00003191826,
		  0.00000789697,
		 -0.00001621710,
		  0.00000000000
};
*/

/* 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_ADC1_Init(void);
static void MX_DAC_Init(void);
static void MX_TIM3_Init(void);
static void MX_TIM4_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
void SignalProcIIR(int odd) {
    for(int i = 0; i < BUFFER_SIZE; i++) {
        f_x2 = f_x1;
        f_x1 = f_x0;
        f_x0 = (float)(ADC_Buffer[odd * BUFFER_SIZE + i] - 2048);
        f_y2 = f_y1;
        f_y1 = f_y0;
        f_y0 = f_a0*f_x0 + f_a1*f_x1 + f_a2*f_x2 - f_b1*f_y1 - f_b2*f_y2;

        s_x2 = s_x1;
        s_x1 = s_x0;
        s_x0 = f_y0; // only this is f_
        s_y2 = s_y1;
        s_y1 = s_y0;
        s_y0 = s_a0*s_x0 + s_a1*s_x1 + s_a2*s_x2 - s_b1*s_y1 - s_b2*s_y2;

        DAC_Buffer[odd * BUFFER_SIZE + i] = (uint16_t)(s_y0 + 2048);
    }
}

void SignalProcFIR(int odd) {
	float acc;
	int i, n;

    for(i = 0; i < BUFFER_SIZE; i++) {
      dly[PTR] = (float)(ADC_Buffer[odd * BUFFER_SIZE + i] - 2048);

      acc = 0.0;
      for(n = 0; n < TAPN-(PTR+1); n++) {
        acc += (coeff[n] * dly[n+(PTR+1)]);
      }
      for(n = TAPN-(PTR+1); n < TAPN; n++) {
        acc += (coeff[n] * dly[n+(PTR+1)-TAPN]);
      }
      f_y0 = acc;

      if(PTR == TAPN-1) PTR = 0;
      else PTR++;

      DAC_Buffer[odd * BUFFER_SIZE + i] = (uint16_t)(f_y0 + 2048);
    }
}

void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef* hadc)
{
  if (hadc->Instance == ADC1) {
	SignalProcFIR(0);
    HAL_GPIO_TogglePin(LD2_GPIO_Port,LD2_Pin);
  }
}

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
  if (hadc->Instance == ADC1) {
	 SignalProcFIR(1);
     HAL_GPIO_TogglePin(LD2_GPIO_Port,LD2_Pin);
  }
}
/* 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_ADC1_Init();
  MX_DAC_Init();
  MX_TIM3_Init();
  MX_TIM4_Init();
  /* USER CODE BEGIN 2 */
  // Start DMA transfer for ADC
  HAL_ADC_Start_DMA(&hadc1, (uint32_t*)ADC_Buffer, BUFFER_SIZE * 2);

  // Start DMA transfer for DAC
  HAL_DAC_Start_DMA(&hdac, DAC_CHANNEL_1, (uint32_t*)DAC_Buffer, BUFFER_SIZE * 2, DAC_ALIGN_12B_R);

  // Start Timer4 for trigger for DAC
  HAL_TIM_Base_Start(&htim4);

  /* 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_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);

  /** 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;
  RCC_OscInitStruct.PLL.PLLM = 16;
  RCC_OscInitStruct.PLL.PLLN = 336;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
  RCC_OscInitStruct.PLL.PLLQ = 2;
  RCC_OscInitStruct.PLL.PLLR = 2;
  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_2) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief ADC1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_ADC1_Init(void)
{

  /* USER CODE BEGIN ADC1_Init 0 */

  /* USER CODE END ADC1_Init 0 */

  ADC_ChannelConfTypeDef sConfig = {0};

  /* USER CODE BEGIN ADC1_Init 1 */

  /* USER CODE END ADC1_Init 1 */

  /** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
  */
  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.ScanConvMode = DISABLE;
  hadc1.Init.ContinuousConvMode = DISABLE;
  hadc1.Init.DiscontinuousConvMode = DISABLE;
  hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING;
  hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T3_TRGO;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.NbrOfConversion = 1;
  hadc1.Init.DMAContinuousRequests = ENABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
  */
  sConfig.Channel = ADC_CHANNEL_6;
  sConfig.Rank = 1;
  sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN ADC1_Init 2 */

  /* USER CODE END ADC1_Init 2 */

}

/**
  * @brief DAC Initialization Function
  * @param None
  * @retval None
  */
static void MX_DAC_Init(void)
{

  /* USER CODE BEGIN DAC_Init 0 */

  /* USER CODE END DAC_Init 0 */

  DAC_ChannelConfTypeDef sConfig = {0};

  /* USER CODE BEGIN DAC_Init 1 */

  /* USER CODE END DAC_Init 1 */

  /** DAC Initialization
  */
  hdac.Instance = DAC;
  if (HAL_DAC_Init(&hdac) != HAL_OK)
  {
    Error_Handler();
  }

  /** DAC channel OUT1 config
  */
  sConfig.DAC_Trigger = DAC_TRIGGER_T4_TRGO;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
  if (HAL_DAC_ConfigChannel(&hdac, &sConfig, DAC_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN DAC_Init 2 */

  /* USER CODE END DAC_Init 2 */

}

/**
  * @brief TIM3 Initialization Function
  * @param None
  * @retval None
  */
static void MX_TIM3_Init(void)
{

  /* USER CODE BEGIN TIM3_Init 0 */

  /* USER CODE END TIM3_Init 0 */

  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_SlaveConfigTypeDef sSlaveConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};

  /* USER CODE BEGIN TIM3_Init 1 */

  /* USER CODE END TIM3_Init 1 */
  htim3.Instance = TIM3;
  htim3.Init.Prescaler = 0;
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim3.Init.Period = 1750-1;
  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sSlaveConfig.SlaveMode = TIM_SLAVEMODE_TRIGGER;
  sSlaveConfig.InputTrigger = TIM_TS_ITR3;
  if (HAL_TIM_SlaveConfigSynchro(&htim3, &sSlaveConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM3_Init 2 */

  /* USER CODE END TIM3_Init 2 */

}

/**
  * @brief TIM4 Initialization Function
  * @param None
  * @retval None
  */
static void MX_TIM4_Init(void)
{

  /* USER CODE BEGIN TIM4_Init 0 */

  /* USER CODE END TIM4_Init 0 */

  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};

  /* USER CODE BEGIN TIM4_Init 1 */

  /* USER CODE END TIM4_Init 1 */
  htim4.Instance = TIM4;
  htim4.Init.Prescaler = 0;
  htim4.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim4.Init.Period = 1750-1;
  htim4.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim4.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim4) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim4, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim4, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM4_Init 2 */

  /* USER CODE END TIM4_Init 2 */

}

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

  /* DMA controller clock enable */
  __HAL_RCC_DMA2_CLK_ENABLE();
  __HAL_RCC_DMA1_CLK_ENABLE();

  /* DMA interrupt init */
  /* DMA1_Stream5_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Stream5_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Stream5_IRQn);
  /* DMA2_Stream0_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  /* USER CODE BEGIN MX_GPIO_Init_1 */

  /* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOH_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin : B1_Pin */
  GPIO_InitStruct.Pin = B1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(B1_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : USART_TX_Pin USART_RX_Pin */
  GPIO_InitStruct.Pin = USART_TX_Pin|USART_RX_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pin : LD2_Pin */
  GPIO_InitStruct.Pin = LD2_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(LD2_GPIO_Port, &GPIO_InitStruct);

  /* USER CODE BEGIN MX_GPIO_Init_2 */

  /* USER CODE END MX_GPIO_Init_2 */
}

/* USER CODE BEGIN 4 */

/* 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 */