/* 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"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "string.h"
#include "stdio.h"

/* USER CODE END Includes */

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

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define TIMEBASE 1000
#define PWM_MINIMUM 20
/* USER CODE END PD */

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

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef htim2;

UART_HandleTypeDef huart2;

/* USER CODE BEGIN PV */
const uint16_t GPU_STAGES[] = {900, 1400, 1800, 2200};
const uint16_t CPU_STAGES[] = {850, 900, 1000, 1200};

uint32_t freq_count_gpu;
uint32_t freq_count_cpu;
uint32_t freq_count_case1;
uint32_t freq_count_case2;
uint32_t last_gpu;
uint32_t last_cpu;
uint32_t last_case1;
uint32_t last_case2;
uint16_t rpm_gpu;
uint16_t rpm_cpu;
uint16_t rpm_case1;
uint16_t rpm_case2;
uint32_t pwm_fan1;
uint32_t pwm_fan2;
uint8_t gpu_stage;
uint8_t cpu_stage;
uint8_t current_stage;
char msg[256];

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM2_Init(void);
static void MX_USART2_UART_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

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

int max(uint8_t a, uint8_t b) {
	if (a > b) {
		return a;
	}
	return b;
}


/* 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_TIM2_Init();
  MX_USART2_UART_Init();
  /* USER CODE BEGIN 2 */
  HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_1);
  HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_2);

  /* USER CODE END 2 */

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

	  if (HAL_GPIO_ReadPin(Switch_GPIO_Port, Switch_Pin) == GPIO_PIN_SET) {
		  // do stuff
	  }

	  if (rpm_gpu < GPU_STAGES[0]) {
		  gpu_stage = 1;
	  } else if (rpm_gpu < GPU_STAGES[1]) {
		  gpu_stage = 2;
	  } else if (rpm_gpu < GPU_STAGES[2]) {
		  gpu_stage = 3;
	  } else if (rpm_gpu < GPU_STAGES[3]) {
		  gpu_stage = 4;
	  } else {
		  gpu_stage = 5;
	  }

	  if (rpm_cpu < CPU_STAGES[0]) {
		  cpu_stage = 1;
	  } else if (rpm_cpu < CPU_STAGES[1]) {
		  cpu_stage = 2;
	  } else if (rpm_cpu < CPU_STAGES[2]) {
		  cpu_stage = 3;
	  } else if (rpm_cpu < CPU_STAGES[3]) {
		  cpu_stage = 4;
	  } else {
		  cpu_stage = 5;
	  }


	  current_stage = max(gpu_stage, cpu_stage);
	  if (current_stage == 1) {
		  pwm_fan1 = PWM_MINIMUM;
	  } else if (current_stage == 2) {
		  pwm_fan1 = 35;
	  } else if (current_stage == 3) {
		  pwm_fan1 = 50;
	  } else if (current_stage == 4) {
		  pwm_fan1 = 80;
	  } else {
		  pwm_fan1 = 100;
	  }

	  // For now
	  pwm_fan2 = pwm_fan1;


	  // Write the value after converting from duty cycle to raw value.
	  TIM2->CCR1 = htim2.Init.Period * pwm_fan1 / 100;
	  TIM2->CCR2 = htim2.Init.Period * pwm_fan2 / 100;


	  // If the fans don't spin, the rpm won't be updated as no
	  // interrupts are called. This resets those values every two seconds.
	  if (HAL_GetTick() - last_gpu >= TIMEBASE * 2) {
	    rpm_gpu = 0;
	    freq_count_gpu = 0;
	  }
	  if (HAL_GetTick() - last_cpu >= TIMEBASE * 2) {
	    rpm_cpu = 0;
	    freq_count_cpu = 0;
	  }
	  if (HAL_GetTick() - last_case1 >= TIMEBASE * 2) {
	    rpm_case1 = 0;
	    freq_count_case1 = 0;
	  }
	  if (HAL_GetTick() - last_case2 >= TIMEBASE * 2) {
	    rpm_case2 = 0;
	    freq_count_case2 = 0;
	  }

	  sprintf(msg, "GPU: %u RPM\nCPU: %u RPM\nCase 1: %u RPM\nCase2: %u RPM\n", rpm_gpu, rpm_cpu, rpm_case1, rpm_case2);
	  HAL_UART_Transmit(&huart2, (uint8_t *) msg, strlen(msg), 100);
	  sprintf(msg, "PWM Case 1: %lu %%\nPWM Case 2: %lu %%\n\n", pwm_fan1, pwm_fan2);
	  HAL_UART_Transmit(&huart2, (uint8_t *) msg, strlen(msg), 100);

	  HAL_Delay(1000);
    /* 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_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
  /** 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.HSIDiv = RCC_HSI_DIV1;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  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_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief TIM2 Initialization Function
  * @param None
  * @retval None
  */
static void MX_TIM2_Init(void)
{

  /* USER CODE BEGIN TIM2_Init 0 */

  /* USER CODE END TIM2_Init 0 */

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

  /* USER CODE BEGIN TIM2_Init 1 */

  /* USER CODE END TIM2_Init 1 */
  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 0;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 640;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
  if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_PWM_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 0;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_PWM_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_2) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM2_Init 2 */

  /* USER CODE END TIM2_Init 2 */
  HAL_TIM_MspPostInit(&htim2);

}

/**
  * @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;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart2.Init.ClockPrescaler = UART_PRESCALER_DIV1;
  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  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_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pins : Case1_Pin Case2_Pin CPU_Pin GPU_Pin */
  GPIO_InitStruct.Pin = Case1_Pin|Case2_Pin|CPU_Pin|GPU_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pin : Switch_Pin */
  GPIO_InitStruct.Pin = Switch_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_PULLDOWN;
  HAL_GPIO_Init(Switch_GPIO_Port, &GPIO_InitStruct);

  /* EXTI interrupt init*/
  HAL_NVIC_SetPriority(EXTI4_15_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI4_15_IRQn);

}

/* USER CODE BEGIN 4 */
void HAL_GPIO_EXTI_Rising_Callback(uint16_t GPIO_Pin) {
	if (GPIO_Pin == GPU_Pin) {
		if ((HAL_GetTick() - last_gpu) <= TIMEBASE) {
			freq_count_gpu++;
		} else {
			rpm_gpu = freq_count_gpu * 60 / 2;
			last_gpu = HAL_GetTick();
			freq_count_gpu = 0;
		}
	}

	if (GPIO_Pin == CPU_Pin) {
		if ((HAL_GetTick() - last_cpu) <= TIMEBASE) {
			freq_count_cpu++;
		} else {
			rpm_cpu = freq_count_cpu * 60 / 2;
			last_cpu = HAL_GetTick();
			freq_count_cpu = 0;
		}
	}


	if (GPIO_Pin == Case1_Pin) {
		if ((HAL_GetTick() - last_case1) <= TIMEBASE) {
			freq_count_case1++;
		} else {
			rpm_case1 = freq_count_case1 * 60 / 2;
			last_case1 = HAL_GetTick();
			freq_count_case1 = 0;
		}
	}
	if (GPIO_Pin == Case2_Pin) {
		if ((HAL_GetTick() - last_case2) <= TIMEBASE) {
			freq_count_case2++;
		} else {
			rpm_case2 = freq_count_case2 * 60 / 2;
			last_case2 = HAL_GetTick();
			freq_count_case2 = 0;
		}
	}
}

/* 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 */

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