/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2022 FaSTTUBe / Oskar W.
  * All rights reserved.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */

#include <stdbool.h>
#include <string.h>

/* USER CODE END Includes */

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

// BITFIELDS ARE LSB FIRST!

typedef union {
	uint8_t raw[1];
	struct {
		bool as_driving_mode : 1;
		bool as_close_sdc : 1;
		bool watchdog : 1;
		uint8_t _padding : 5;
	} signals;
} rx_data_t;

typedef union {
	uint8_t raw[1];
	struct {
		bool sdc_in : 1;
		bool sdc_ready : 1;
		bool ts_start : 1;
		uint8_t _padding : 5;
	} signals;
} tx_data_t;

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

#define CAN_ID_RX 0x10
#define CAN_ID_TX 0x11

// Wait 20ms. Needs to be less than watchdog period!
#define RX_UPDATE_PERIOD 20
// Defined in DBC. Should be multiple of RX_UPDATE_PERIOD
#define TX_UPDATE_PERIOD 100

/* USER CODE END PD */

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

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
CAN_HandleTypeDef hcan;

/* USER CODE BEGIN PV */

rx_data_t RxData;

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_CAN_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_CAN_Init();
  /* USER CODE BEGIN 2 */

  // Init data as LOW
  memset(&RxData, 0, sizeof(rx_data_t));

  if (HAL_CAN_Start(&hcan) != HAL_OK)
  	Error_Handler();

  CAN_FilterTypeDef canfilterconfig;

  canfilterconfig.FilterActivation = CAN_FILTER_ENABLE;
  canfilterconfig.FilterBank = 0;
  canfilterconfig.FilterFIFOAssignment = CAN_FILTER_FIFO0;
  canfilterconfig.FilterIdHigh = 0;
  canfilterconfig.FilterIdLow = 0;
  canfilterconfig.FilterMaskIdHigh = 0;
  canfilterconfig.FilterMaskIdLow = 0;
  canfilterconfig.FilterMode = CAN_FILTERMODE_IDMASK;
  canfilterconfig.FilterScale = CAN_FILTERSCALE_32BIT;
  canfilterconfig.SlaveStartFilterBank = 14;

  if (HAL_CAN_ConfigFilter(&hcan, &canfilterconfig) != HAL_OK) {
    Error_Handler();
  }

  if (HAL_CAN_ActivateNotification(&hcan, CAN_IT_RX_FIFO0_MSG_PENDING) != HAL_OK)
    Error_Handler();

  CAN_TxHeaderTypeDef   TxHeader;
  uint32_t              TxMailbox;
  tx_data_t				TxData;

  memset(&TxData, 0, sizeof(tx_data_t));

  // Prep the tx frame
  TxHeader.IDE = CAN_ID_STD;
  TxHeader.StdId = CAN_ID_TX;
  TxHeader.RTR = CAN_RTR_DATA;
  TxHeader.DLC = 1;

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */

  uint32_t counter = 0;

  while (true) {

	// Write out all values received via interrupt to the pins
	HAL_GPIO_WritePin(GPIOA, AS_driving_mode_Pin, RxData.signals.as_driving_mode);
	HAL_GPIO_WritePin(GPIOA, AS_close_SDC_Pin, RxData.signals.as_close_sdc);
	HAL_GPIO_WritePin(GPIOA, Watchdog_Pin, RxData.signals.watchdog);

	// every nth rx, we tx¨
	if (++counter >= (TX_UPDATE_PERIOD / RX_UPDATE_PERIOD)) {

		// Read values to send
		uint8_t s = HAL_GPIO_ReadPin(GPIOA, SDC_in_3V3_Pin) == GPIO_PIN_SET;
		uint8_t r = HAL_GPIO_ReadPin(GPIOA, SDC_is_ready_Pin) == GPIO_PIN_SET;
		uint8_t t = HAL_GPIO_ReadPin(GPIOA, TS_activate_MUXed_Pin) == GPIO_PIN_SET;
		TxData.signals.sdc_in 	 = s;
		TxData.signals.sdc_ready = r;
		TxData.signals.ts_start	 = t;

		// Send out CAN message
		if (HAL_CAN_AddTxMessage(&hcan, &TxHeader, TxData.raw, &TxMailbox) != HAL_OK)
			Error_Handler();

		counter = 0;

	}

	// Slow the loop
	HAL_Delay(RX_UPDATE_PERIOD);

    /* 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};

  /** 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_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_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

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

/**
  * @brief CAN Initialization Function
  * @param None
  * @retval None
  */
static void MX_CAN_Init(void)
{

  /* USER CODE BEGIN CAN_Init 0 */

  /* USER CODE END CAN_Init 0 */

  /* USER CODE BEGIN CAN_Init 1 */

  /* USER CODE END CAN_Init 1 */
  hcan.Instance = CAN;
  hcan.Init.Prescaler = 1;
  hcan.Init.Mode = CAN_MODE_NORMAL;
  hcan.Init.SyncJumpWidth = CAN_SJW_1TQ;
  hcan.Init.TimeSeg1 = CAN_BS1_13TQ;
  hcan.Init.TimeSeg2 = CAN_BS2_2TQ;
  hcan.Init.TimeTriggeredMode = DISABLE;
  hcan.Init.AutoBusOff = DISABLE;
  hcan.Init.AutoWakeUp = DISABLE;
  hcan.Init.AutoRetransmission = ENABLE;
  hcan.Init.ReceiveFifoLocked = DISABLE;
  hcan.Init.TransmitFifoPriority = DISABLE;
  if (HAL_CAN_Init(&hcan) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN CAN_Init 2 */

  /* USER CODE END CAN_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 pin Output Level */
  HAL_GPIO_WritePin(GPIOA, AS_close_SDC_Pin|AS_driving_mode_Pin|Watchdog_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pins : SDC_is_ready_Pin SDC_in_3V3_Pin */
  GPIO_InitStruct.Pin = SDC_is_ready_Pin|SDC_in_3V3_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pins : AS_close_SDC_Pin AS_driving_mode_Pin Watchdog_Pin */
  GPIO_InitStruct.Pin = AS_close_SDC_Pin|AS_driving_mode_Pin|Watchdog_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

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

}

/* USER CODE BEGIN 4 */

// CAN RX interrupt handler
void HAL_CAN_RxFifo0MsgPendingCallback(CAN_HandleTypeDef *hcan) {

  CAN_RxHeaderTypeDef   RxHeader;
  uint8_t				RxBuffer[8];

  // Read frame from HW into buffer
  if (HAL_CAN_GetRxMessage(hcan, CAN_RX_FIFO0, &RxHeader, RxBuffer) != HAL_OK)
    Error_Handler();

  // Copy into the bitfield if it's for us
  if (RxHeader.StdId == CAN_ID_RX)
	RxData.raw[0] = RxBuffer[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 */