/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    stm32f1xx_it.c
  * @brief   Interrupt Service Routines.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2022 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 "stm32f1xx_it.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "uart.h"
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN TD */

/* USER CODE END TD */

/* 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 */
uint32_t adcCounter=0;
int maxWaveDiff = 0;	// Stores the latest measured ADC Wave data (MAX-MIN)

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/* External variables --------------------------------------------------------*/
extern ADC_HandleTypeDef hadc1;
extern UART_HandleTypeDef huart2;
/* USER CODE BEGIN EV */

/* USER CODE END EV */

/******************************************************************************/
/*           Cortex-M3 Processor Interruption and Exception Handlers          */
/******************************************************************************/
/**
  * @brief This function handles Non maskable interrupt.
  */
void NMI_Handler(void)
{
  /* USER CODE BEGIN NonMaskableInt_IRQn 0 */

  /* USER CODE END NonMaskableInt_IRQn 0 */
  /* USER CODE BEGIN NonMaskableInt_IRQn 1 */
  while (1)
  {
  }
  /* USER CODE END NonMaskableInt_IRQn 1 */
}

/**
  * @brief This function handles Hard fault interrupt.
  */
void HardFault_Handler(void)
{
  /* USER CODE BEGIN HardFault_IRQn 0 */

  /* USER CODE END HardFault_IRQn 0 */
  while (1)
  {
    /* USER CODE BEGIN W1_HardFault_IRQn 0 */
    /* USER CODE END W1_HardFault_IRQn 0 */
  }
}

/**
  * @brief This function handles Memory management fault.
  */
void MemManage_Handler(void)
{
  /* USER CODE BEGIN MemoryManagement_IRQn 0 */

  /* USER CODE END MemoryManagement_IRQn 0 */
  while (1)
  {
    /* USER CODE BEGIN W1_MemoryManagement_IRQn 0 */
    /* USER CODE END W1_MemoryManagement_IRQn 0 */
  }
}

/**
  * @brief This function handles Prefetch fault, memory access fault.
  */
void BusFault_Handler(void)
{
  /* USER CODE BEGIN BusFault_IRQn 0 */

  /* USER CODE END BusFault_IRQn 0 */
  while (1)
  {
    /* USER CODE BEGIN W1_BusFault_IRQn 0 */
    /* USER CODE END W1_BusFault_IRQn 0 */
  }
}

/**
  * @brief This function handles Undefined instruction or illegal state.
  */
void UsageFault_Handler(void)
{
  /* USER CODE BEGIN UsageFault_IRQn 0 */

  /* USER CODE END UsageFault_IRQn 0 */
  while (1)
  {
    /* USER CODE BEGIN W1_UsageFault_IRQn 0 */
    /* USER CODE END W1_UsageFault_IRQn 0 */
  }
}

/**
  * @brief This function handles System service call via SWI instruction.
  */
void SVC_Handler(void)
{
  /* USER CODE BEGIN SVCall_IRQn 0 */

  /* USER CODE END SVCall_IRQn 0 */
  /* USER CODE BEGIN SVCall_IRQn 1 */

  /* USER CODE END SVCall_IRQn 1 */
}

/**
  * @brief This function handles Debug monitor.
  */
void DebugMon_Handler(void)
{
  /* USER CODE BEGIN DebugMonitor_IRQn 0 */

  /* USER CODE END DebugMonitor_IRQn 0 */
  /* USER CODE BEGIN DebugMonitor_IRQn 1 */

  /* USER CODE END DebugMonitor_IRQn 1 */
}

/**
  * @brief This function handles Pendable request for system service.
  */
void PendSV_Handler(void)
{
  /* USER CODE BEGIN PendSV_IRQn 0 */

  /* USER CODE END PendSV_IRQn 0 */
  /* USER CODE BEGIN PendSV_IRQn 1 */

  /* USER CODE END PendSV_IRQn 1 */
}

/**
  * @brief This function handles System tick timer.
  */
void SysTick_Handler(void)
{
  /* USER CODE BEGIN SysTick_IRQn 0 */

  /* USER CODE END SysTick_IRQn 0 */
  HAL_IncTick();
  /* USER CODE BEGIN SysTick_IRQn 1 */

  /* USER CODE END SysTick_IRQn 1 */
}

/******************************************************************************/
/* STM32F1xx Peripheral Interrupt Handlers                                    */
/* Add here the Interrupt Handlers for the used peripherals.                  */
/* For the available peripheral interrupt handler names,                      */
/* please refer to the startup file (startup_stm32f1xx.s).                    */
/******************************************************************************/

/**
  * @brief This function handles ADC1 and ADC2 global interrupts.
  */
void ADC1_2_IRQHandler(void)
{
  /* USER CODE BEGIN ADC1_2_IRQn 0 */

	/**
	 * Test with osc wave out 50Hz Sine 2160mV (according to Osc measurement)
	 *
	 * ADC is 0-3.3V on 12 bits = 4096 bits = 0,8056640625mV / bit
	 *
	 * max-min measured in ADC of 2605 = 2098,7mV so a small diff of 61mV
	 */

	const uint16_t NO_OF_SAMPLES = 3333*2;	//71samples = 3333/Wave
	//const uint16_t NO_OF_SAMPLES = 4117*2;	//55samples = 4117/Wave
	const uint16_t FILTER_STEPS = 4;

	static uint8_t state = 0;	// 0=Pre-sampl, 1=Sample, 3=Done

	static uint32_t filteredValue=0;
	static uint32_t emaVal = 0;
	static uint16_t adcData = 0;
	static uint16_t minValue = 0xFFF;
	static uint16_t maxValue = 0;
	static uint32_t cnt = NO_OF_SAMPLES;

	adcData = ADC1->DR;		// Get data

	switch( state ) {
	case 0:
		// Pre-sample state. Sample and avg
		filteredValue += adcData;
		if( cnt == (NO_OF_SAMPLES-FILTER_STEPS+1) ) {
			filteredValue /= FILTER_STEPS;
			emaVal =  (filteredValue << FILTER_STEPS) - filteredValue; // Init start value
			state = 1;
		}
		cnt--;
		break;
	case 1:
		// Sampling state
		emaVal += adcData;
		filteredValue = (emaVal + (1 << (FILTER_STEPS - 1) )) >> FILTER_STEPS;
		emaVal -= filteredValue;
		if( filteredValue > maxValue ) maxValue = filteredValue;
		if( filteredValue < minValue ) minValue = filteredValue;
		if( cnt == 0 ) {
			state = 2;
		}
		cnt--;
		break;
	case 2:
		// End of main sampling. Reset everything
		ADC1->CR1  = 0; // Disable interrupts
		filteredValue = 0;
		cnt=NO_OF_SAMPLES;
		state = 0;
		maxWaveDiff = (int)maxValue - (int)minValue;
		minValue = 0xFFF;
		maxValue = 0;
		adcCounter++;
		break;
	}



  /* USER CODE END ADC1_2_IRQn 0 */
  /* USER CODE BEGIN ADC1_2_IRQn 1 */

  /* USER CODE END ADC1_2_IRQn 1 */
}

/**
  * @brief This function handles USART2 global interrupt.
  */
void USART2_IRQHandler(void)
{
  /* USER CODE BEGIN USART2_IRQn 0 */
	usartInterrupt();

  /* USER CODE END USART2_IRQn 0 */
  /* USER CODE BEGIN USART2_IRQn 1 */

  /* USER CODE END USART2_IRQn 1 */
}

/* USER CODE BEGIN 1 */

/* USER CODE END 1 */