/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2024 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"
#include <stdarg.h>
#include "stdio.h"
#include "string.h"
#define INT_STATUS_1_REG  0x00
#define MAX30102_ADDR (0x57 << 1)
#define INT_STA1_REG 0x00
#define INT_STA2_REG 0x01
#define INT_ENA1_REG 0x02
#define INT_ENA2_REG 0x03
#define FIFO_WR_PTR 0x04
#define FIFO_OVF_COUNT 0x05
#define FIFO_RD_PTR 0x06
#define FIFO_DATA_REG 0x07
#define FIFO_CONFIG_REG 0x08
#define MODE_CONFIG_REG 0x09
#define SPO2_CONFIG_REG 0x0A
#define LED_PULSE_AMPL_1 0x0C
#define LED_PULSE_AMPL_2 0x0D
#define MULTI_LED_CONTR_REG_1 0x11
#define MULTI_LED_CONTR_REG_2 0x12

// MAX30102 I2C Address
#define MAX30102_WR_ADDR 0xAE
#define MAX30102_RD_ADDR 0xAF
#define PORT_USED 0
#define HR_Mode 0x02 // Red LED only
#define SpO2_Mode 0x03 // RED & IR LED
#define MulitLED_Mode 0x07 // RED & IR LED
#define THRESHOLD 1000
#define SAMPLE_RATE 1000
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
int check=0;
I2C_HandleTypeDef hi2c1;
I2C_HandleTypeDef hi2c2;
I2C_HandleTypeDef hi2c3;

TIM_HandleTypeDef htim3;

UART_HandleTypeDef huart2;

int max30102_write_reg(uint8_t , uint8_t,I2C_HandleTypeDef );
int max30102_init(uint8_t,I2C_HandleTypeDef x);
void max30102_read_fifo_and_calculate_hr(I2C_HandleTypeDef );
int max30102_read_register(uint8_t , uint8_t* , size_t ,I2C_HandleTypeDef );
/* USER CODE BEGIN PV */
void log_message(char *format, ...) {
    char buffer[100];  // Adjust size as needed
    va_list args;
    va_start(args, format);
    vsprintf(buffer, format, args);
    va_end(args);

    HAL_UART_Transmit(&huart2, (uint8_t*)buffer, strlen(buffer), HAL_MAX_DELAY);
}
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
static void MX_I2C2_Init(void);
static void MX_I2C3_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_TIM3_Init(void);


int max30102_write_reg(uint8_t reg , uint8_t value,I2C_HandleTypeDef x)
{
	uint8_t data[2];
	 data[0] = reg;  // Register address
	 data[1] = value; // Value to write
	 HAL_StatusTypeDef ret;
	 ret = HAL_I2C_Master_Transmit(&x, MAX30102_ADDR, data, sizeof(data), HAL_MAX_DELAY);
	 if ( ret != HAL_OK ){
		log_message("Not working write");
		 return 0;
	 }
        return 1;
}

void max30102_read_fifo_and_calculate_hr(I2C_HandleTypeDef x)
{
	uint8_t  wr_ptr=0;  uint8_t rd_ptr=0;
	 max30102_read_register(FIFO_WR_PTR, &wr_ptr, 1,x);
     max30102_read_register(FIFO_RD_PTR, &rd_ptr, 1,x);

		    uint8_t num_samples = (wr_ptr - rd_ptr);
		    		if(num_samples<1)
		    			num_samples=num_samples+32;

		    for (int i = 0; i < num_samples; i++)
		    {
		        uint8_t sample[6];
		        HAL_Delay(10);
		        max30102_read_register(FIFO_DATA_REG, sample,6,x);

		        //Extract only Red LED sample
		        uint32_t red_sample = ((uint32_t)(sample[0] << 16) | (uint32_t)(sample[1] << 8) | (uint32_t)(sample[2])) & 0x3FFFF;

		       log_message("%d,",red_sample);

		    }

}

    int max30102_read_register(uint8_t reg, uint8_t* value, size_t length, I2C_HandleTypeDef x)
    {
    	HAL_StatusTypeDef    ret_code_t;

        ret_code_t  = HAL_I2C_Master_Transmit(&x, MAX30102_ADDR, &reg, 1, HAL_MAX_DELAY);
        if (ret_code_t != HAL_OK ) {
        	log_message("Failed to set register address  Error code");
            return 0;
        }

        ret_code_t= HAL_I2C_Master_Receive(&x, MAX30102_ADDR, value, length,HAL_MAX_DELAY);
        if  (ret_code_t != HAL_OK ) {
        	log_message("Failed to read data from MAX30102 register");
            return 0;
        }
        return 1;
    }


    int max30102_init(uint8_t Mode, I2C_HandleTypeDef x)
    {
        if (!max30102_write_reg(INT_ENA1_REG, 0x00, x)) { // A_FULL=1, PPG_RDY_EN=0 ALC_OVF_EN=0 -> 0x80
        	log_message("Failed to write INT_ENA1_REG");
            return 0;
        }
        if (!max30102_write_reg(INT_ENA2_REG, 0x00,x)) { // DIE_TEMP_RDY_EN = 0
        	log_message("Failed to write INT_ENA2_REG");
            return 0;
        }
        if (!max30102_write_reg(FIFO_WR_PTR, 0x00,x)) {
        	log_message("Failed to write FIFO_WR_PTR");
            return 0;
        }
        if (!max30102_write_reg(FIFO_OVF_COUNT, 0x00,x)) {
        	log_message("Failed to write FIFO_OVF_COUNT");
            return 0;
        }
        if (!max30102_write_reg(FIFO_RD_PTR, 0x00,x)) {
        	log_message("Failed to write FIFO_RD_PTR");
            return 0;
        }
        if (!max30102_write_reg(FIFO_CONFIG_REG, 0xF0,x)) { // SMP_AVE=32(111), FIFO_ROLLOVER_EN=0, FIFO_A_FULL=32(0000) ->1110 0000=0xE0
        	log_message("Failed to write FIFO_CONFIG_REG");
            return 0;
        }
        if (!max30102_write_reg(MODE_CONFIG_REG, Mode,x)) {
        	log_message("Failed to write MODE_CONFIG_REG");
            return 0;
        }
        if (!max30102_write_reg(SPO2_CONFIG_REG, 0x27,x)) {
        	log_message("Failed to write SPO2_CONFIG_REG");
            return 0;
        }
        if (!max30102_write_reg(LED_PULSE_AMPL_1, 0x32,x)) { // IR-LED current = 10mA
        	log_message("Failed to write LED_PULSE_AMPL_1");
            return 0;
        }
        if (!max30102_write_reg(LED_PULSE_AMPL_2, 0x32,x)) { // RED-LED current = 10mA
        	log_message("Failed to write LED_PULSE_AMPL_2");
            return 0;
        }

        return 1;
    }

/* 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 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_I2C1_Init();
  MX_I2C2_Init();
  MX_I2C3_Init();
  MX_USART2_UART_Init();
  MX_TIM3_Init();
  log_message("Place_your_hand");
  HAL_Delay(2000);
  max30102_init(SpO2_Mode,hi2c1);
  max30102_init(SpO2_Mode,hi2c2);
  max30102_init(SpO2_Mode,hi2c3);

  HAL_TIM_Base_Start_IT(&htim3);
  /* USER CODE BEGIN 2 */

  /* USER CODE END 2 */
void kappdata(){
          max30102_read_fifo_and_calculate_hr(hi2c1);
}

void vatta(){
		  max30102_read_fifo_and_calculate_hr(hi2c2);
}

void pitta(){
         max30102_read_fifo_and_calculate_hr(hi2c3);
}
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  if(check==0) kappdata();
	  if(check==1) vatta();
	  if(check==2) pitta();

  }
  /* 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 I2C2 Initialization Function
  * @param None
  * @retval None
  */
static void MX_I2C2_Init(void)
{

  /* USER CODE BEGIN I2C2_Init 0 */

  /* USER CODE END I2C2_Init 0 */

  /* USER CODE BEGIN I2C2_Init 1 */

  /* USER CODE END I2C2_Init 1 */
  hi2c2.Instance = I2C2;
  hi2c2.Init.ClockSpeed = 100000;
  hi2c2.Init.DutyCycle = I2C_DUTYCYCLE_2;
  hi2c2.Init.OwnAddress1 = 0;
  hi2c2.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c2.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c2.Init.OwnAddress2 = 0;
  hi2c2.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c2.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c2) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN I2C2_Init 2 */

  /* USER CODE END I2C2_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 */

  /* USER CODE BEGIN I2C3_Init 1 */

  /* USER CODE END I2C3_Init 1 */
  hi2c3.Instance = I2C3;
  hi2c3.Init.ClockSpeed = 100000;
  hi2c3.Init.DutyCycle = I2C_DUTYCYCLE_2;
  hi2c3.Init.OwnAddress1 = 0;
  hi2c3.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c3.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c3.Init.OwnAddress2 = 0;
  hi2c3.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c3.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c3) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN I2C3_Init 2 */

  /* USER CODE END I2C3_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_MasterConfigTypeDef sMasterConfig = {0};

  /* USER CODE BEGIN TIM3_Init 1 */

  /* USER CODE END TIM3_Init 1 */
  htim3.Instance = TIM3;
  htim3.Init.Prescaler = 8399;
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim3.Init.Period = 49999;
  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
  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();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  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 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};
/* 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 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 */