/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2021 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "string.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 ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;

UART_HandleTypeDef huart2;

unsigned char buf[1];
uint8_t buffer[5];

char temp_int;
char temp_frac;
int temperature;
uint32_t rawIRValue;
uint32_t rawRedValue;

const int avgAmount=64;
int baseValue=0;
int x=0;
int16_t an_x[100];
int32_t n_denom;

/*
int16_t IR_AC_Max=20;
int16_t IR_AC_Min=-20;

int16_t IR_AC_Signal_Current = 0;
int16_t IR_AC_Signal_Previous = 0;
int16_t IR_AC_Signal_min = 0;
int16_t IR_AC_Signal_max = 0;
int16_t IR_Average_Estomated;

int16_t positiveEdge=0;
int16_t negativeEdge=0;
int16_t ir_avg_reg=0;

int16_t cbuf[32];
uint8_t offset =0;

static const uint16_t FIRCoeffs[12]= {172, 321, 579, 927, 1360, 1858, 2390, 2916, 3391, 3768, 4012, 4096};

*/




uint32_t un_ir_mean, n_ir_buffer_length;
int32_t k;

int dcIR, olddcIR, filteredIRValue;
int dcRed, olddcRed, filteredRedValue;

int v1[2], lpFiltered1;

int values[6], sum, avg, result;
char count, inde;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_I2C1_Init(void);
/* USER CODE BEGIN PFP */

/* 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. */
  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_USART2_UART_Init();
  MX_I2C1_Init();
  /* USER CODE BEGIN 2 */


  // RedLED Pulse Amplitude
RedLEDPulseAmpl();

  // IR Pulse Amplitude
IRPulseAmpl();

  //Setting Mode HR and SPO2
  Mode();

  //INITFIFO
  INITFIFO();

   //FIFOConfig
  FIFOConfig();

   //SPO2 Mode Config
  SPO2config();

  /* USER CODE END 2 */

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



	  GetRAWDATA();
	  HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5);


	  //Average of IR
	  for (x=0; x<avgAmount; x++){

		  baseValue+=rawIRValue;
	  }
	  baseValue/=avgAmount;

	  //IR-Signal without DC
	  for (x=0; x<avgAmount; x++){

	  		  an_x[x]= -1*(rawIRValue - 0.95*baseValue);
	  	  }

	  //
	  for(x=0; k<96; k++){
		  n_denom= (an_x[k]+an_x[k+1]+an_x[k+2]+an_x[k+3]);
	  an_x[k]=n_denom/(int32_t)4;
	  }





    /* 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 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.ClockSpeed = 100000;
  hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
  hi2c1.Init.OwnAddress1 = 0;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN I2C1_Init 2 */

  /* USER CODE END I2C1_Init 2 */

}

/**
  * @brief USART2 Initialization Function
  * @param None
  * @retval None
  */
static void MX_USART2_UART_Init(void)
{

  /* USER CODE BEGIN USART2_Init 0 */

  /* USER CODE END USART2_Init 0 */

  /* USER CODE BEGIN USART2_Init 1 */

  /* USER CODE END USART2_Init 1 */
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART2_Init 2 */

  /* USER CODE END USART2_Init 2 */

}

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

  /* 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 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 4 */
void RedLEDPulseAmpl(void)
  {
    buf[0]=0x0C;//address of set mode
    buf[1]=0x1F;//value for RedLED = 17,4mA 0x57
    HAL_I2C_Master_Transmit(&hi2c1,0x057<<1,buf,2,100);
  }

void IRPulseAmpl()
{
  buf[0]=0x0D;//address of set mode
  buf[1]=0x0F;//value for IR = 12,6mA 0x3F
  HAL_I2C_Master_Transmit(&hi2c1,0x057<<1,buf,2,100);
}


void Mode() //RESET 0x43
  {
    buf[0]=0x09;//address of set mode
    buf[1]=0x03;// 0x03 value for HR and SPO2 measurement   0x07 for Multi-Mode  0x02 HR mode
    HAL_I2C_Master_Transmit(&hi2c1,0x057<<1,buf,2,100);
  }


void INITFIFO()
  {
    buf[0]=0x04;//address of FIFO_W_Pointer
    buf[1]=0x00;//value 0
    HAL_I2C_Master_Transmit(&hi2c1,0x057<<1,buf,2,100);

    buf[0]=0x05;//address of FIFO_R_Pointer
    buf[1]=0x00;//value 0
    HAL_I2C_Master_Transmit(&hi2c1,0x057<<1,buf,2,100);

    buf[0]=0x06;//address of FIFO_OVF_COUNTER
    buf[1]=0x00;//value 0
    HAL_I2C_Master_Transmit(&hi2c1,0x057<<1,buf,2,100);
  }

void FIFOConfig()
  {
    buf[0]=0x08;//address of FIFO_OVF_COUNTER
    buf[1]=0x7F;//value 1F
    HAL_I2C_Master_Transmit(&hi2c1,0x057<<1,buf,2,100);
  }

void SPO2config(void)
    {
    buf[0]=0x0A;//address of set mode
    buf[1]=0x27;//value for LED Config  sr=100,pw=411, 18-Bit, scale=4096  , 0x67 LED Config  sr=100,pw=411, 18-Bit, scale=16384
    HAL_I2C_Master_Transmit(&hi2c1,0x057<<1,buf,2,100);
    }


void GetRAWDATA(void)
{
	  buf[0]=0x07;//address of FIFO
	  HAL_I2C_Master_Transmit(&hi2c1,0x057<<1,buf,1,100);
	  HAL_I2C_Master_Receive(&hi2c1,0x057<<1 ,buffer,6,100);

	  rawIRValue = (buffer[0] << 16)| (buffer[1] << 8)| buffer[2];
	  rawRedValue = (buffer[3] << 16)| (buffer[4] << 8)| buffer[5];
}


/* 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 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/