/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file           : main.c
 * @brief          : Main program body
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2023 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 "images.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;

SPI_HandleTypeDef hspi1;
DMA_HandleTypeDef hdma_spi1_rx;
DMA_HandleTypeDef hdma_spi1_tx;

UART_HandleTypeDef huart2;

PCD_HandleTypeDef hpcd_USB_FS;

/* USER CODE BEGIN PV */
int SPI_Rx_Done_Flag = 0;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_SPI1_Init(void);
static void MX_I2C1_Init(void);
static void MX_USB_PCD_Init(void);
/* USER CODE BEGIN PFP */



/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
static unsigned frame_num = 0;
static unsigned tx_busy = 0;
static unsigned interval_ms = 1000 / FRAME_RATE;

static uint8_t frame_buffer[FRAME_WIDTH * FRAME_HEIGHT * 16 / 8];
static void fill_color_bar(uint8_t *buffer, unsigned start_position)
{
  /* EBU color bars
   * See also https://stackoverflow.com/questions/6939422 */
  static uint8_t const bar_color[8][4] = {
    /*  Y,   U,   Y,   V */
    { 235, 128, 235, 128}, /* 100% White */
    { 219,  16, 219, 138}, /* Yellow */
    { 188, 154, 188,  16}, /* Cyan */
    { 173,  42, 173,  26}, /* Green */
    {  78, 214,  78, 230}, /* Magenta */
    {  63, 102,  63, 240}, /* Red */
    {  32, 240,  32, 118}, /* Blue */
    {  16, 128,  16, 128}, /* Black */
  };
  uint8_t *p;

  /* Generate the 1st line */
  uint8_t *end = &buffer[FRAME_WIDTH * 2];
  unsigned idx = (FRAME_WIDTH / 2 - 1) - (start_position % (FRAME_WIDTH / 2));
  p = &buffer[idx * 4];
  for (unsigned i = 0; i < 8; ++i) {
    for (int j = 0; j < FRAME_WIDTH / (2 * 8); ++j) {
      memcpy(p, &bar_color[i], 4);
      p += 4;
      if (end <= p) {
        p = buffer;
      }
    }
  }
  /* Duplicate the 1st line to the others */
  p = &buffer[FRAME_WIDTH * 2];
  for (unsigned i = 1; i < FRAME_HEIGHT; ++i) {
    memcpy(p, buffer, FRAME_WIDTH * 2);
    p += FRAME_WIDTH * 2;
  }
}

static struct {
  uint32_t       size;
  uint8_t const *buffer;
} const frames[] = {
  {color_bar_0_jpg_len, color_bar_0_jpg},
  {color_bar_1_jpg_len, color_bar_1_jpg},
  {color_bar_2_jpg_len, color_bar_2_jpg},
  {color_bar_3_jpg_len, color_bar_3_jpg},
  {color_bar_4_jpg_len, color_bar_4_jpg},
  {color_bar_5_jpg_len, color_bar_5_jpg},
  {color_bar_6_jpg_len, color_bar_6_jpg},
  {color_bar_7_jpg_len, color_bar_7_jpg},
};

/*
void cdc_task(void)
{
  // connected() check for DTR bit
  // Most but not all terminal client set this when making connection
  // if ( tud_cdc_connected() )
  {

    // connected and there are data available
    if (tud_cdc_available())
    {

      // read data
      char buf[64];
      uint32_t count = tud_cdc_read(buf, sizeof(buf));
      (void)count;

      //char buf_2[10] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
      //uint32_t count_2 = 10;
      // Echo back
      // Note: Skip echo by commenting out write() and write_flush()
      // for throughput test e.g
      //    $ dd if=/dev/zero of=/dev/ttyACM0 count=10000
      tud_cdc_write(buf, count);
      //tud_cdc_n_write(10, buf_2, count_2);
      tud_cdc_write_flush();
    }
  }
}
*/

void video_task(void)
{
  static unsigned start_ms = 0;
  static unsigned already_sent = 0;

  if (!tud_video_n_streaming(0, 0)) {
    already_sent  = 0;
    frame_num     = 0;
    //return;
  }

  if (!already_sent) {
    already_sent = 1;
    start_ms = HAL_GetTick();

    //tud_video_n_frame_xfer(0, 0, (void*)(uintptr_t)frames[frame_num % 8].buffer, frames[frame_num % 8].size);
    fill_color_bar(frame_buffer, frame_num);
    tud_video_n_frame_xfer(0, 0, (void*)frame_buffer, FRAME_WIDTH * FRAME_HEIGHT * 16/8);
  }

  //tud_video_n_frame_xfer(0, 0, (void*)(uintptr_t)frames[frame_num % 8].buffer, frames[frame_num % 8].size);
  return;
  unsigned cur = HAL_GetTick();
  if (cur - start_ms < interval_ms) return; // not enough time
  if (tx_busy) return;
  start_ms += interval_ms;


  tud_video_n_frame_xfer(0, 0, (void*)(uintptr_t)frames[frame_num % 8].buffer, frames[frame_num % 8].size);
}

/* 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_DMA_Init();
  MX_USART2_UART_Init();
  MX_SPI1_Init();
  MX_I2C1_Init();
  MX_USB_PCD_Init();
  /* USER CODE BEGIN 2 */

  HAL_PWREx_EnableVddUSB();
  HAL_Delay(1);
  tud_init(BOARD_DEVICE_RHPORT_NUM);
  

  //HAL_Delay(10);
  //SPI_Init(&hspi1);

  // Wait for power stabilization
  //HAL_Delay(1000);

  //Cam_Init(&hi2c1, &hspi1);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    tud_task();
    //tud_cdc_write("1\r", 3);
    //tud_cdc_write_flush();
    video_task();
    HAL_Delay(1);

    /*
    Cam_Capture(&hspi1);

    uint16_t image_size = Cam_FIFO_length(&hspi1);

    uint8_t *image_data = malloc(image_size * sizeof(uint8_t));
    memset(image_data, 0x00, image_size);

    Cam_Start_Burst_Read(&hspi1);

    HAL_SPI_Receive_DMA(&hspi1, image_data, image_size);
    Debug_LED_On();

    while (SPI_Rx_Done_Flag == 0)
    {
      // Wait for SPI transfer to finish
    }
    Debug_LED_Off();
    CS_Off();

    SPI_Rx_Done_Flag = 0;

    HAL_UART_Transmit(&huart2, image_data, image_size, HAL_MAX_DELAY);
    Debug_LED_Off();
    free(image_data);
    */
    /* 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
   */
  if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the RCC Oscillators according to the specified parameters
   * in the RCC_OscInitTypeDef structure.
   */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48 | RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSI48State = RCC_HSI48_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 = 1;
  RCC_OscInitStruct.PLL.PLLN = 10;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  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_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != 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.Timing = 0x10909CEC;
  hi2c1.Init.OwnAddress1 = 0;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c1) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Analogue filter
   */
  if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure Digital filter
   */
  if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN I2C1_Init 2 */

  /* USER CODE END I2C1_Init 2 */
}

/**
 * @brief SPI1 Initialization Function
 * @param None
 * @retval None
 */
static void MX_SPI1_Init(void)
{

  /* USER CODE BEGIN SPI1_Init 0 */

  /* USER CODE END SPI1_Init 0 */

  /* USER CODE BEGIN SPI1_Init 1 */

  /* USER CODE END SPI1_Init 1 */
  /* SPI1 parameter configuration*/
  hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 7;
  hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
  hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
  if (HAL_SPI_Init(&hspi1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN SPI1_Init 2 */

  /* USER CODE END SPI1_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;
  huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  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 USB Initialization Function
 * @param None
 * @retval None
 */
static void MX_USB_PCD_Init(void)
{

  /* USER CODE BEGIN USB_Init 0 */

  /* USER CODE END USB_Init 0 */

  /* USER CODE BEGIN USB_Init 1 */

  /* USER CODE END USB_Init 1 */
  hpcd_USB_FS.Instance = USB;
  hpcd_USB_FS.Init.dev_endpoints = 8;
  hpcd_USB_FS.Init.speed = PCD_SPEED_FULL;
  hpcd_USB_FS.Init.phy_itface = PCD_PHY_EMBEDDED;
  hpcd_USB_FS.Init.Sof_enable = DISABLE;
  hpcd_USB_FS.Init.low_power_enable = DISABLE;
  hpcd_USB_FS.Init.lpm_enable = DISABLE;
  hpcd_USB_FS.Init.battery_charging_enable = DISABLE;
  if (HAL_PCD_Init(&hpcd_USB_FS) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USB_Init 2 */

  /* USER CODE END USB_Init 2 */
}

/**
 * Enable DMA controller clock
 */
static void MX_DMA_Init(void)
{

  /* DMA controller clock enable */
  __HAL_RCC_DMA1_CLK_ENABLE();

  /* DMA interrupt init */
  /* DMA1_Channel2_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Channel2_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Channel2_IRQn);
  /* DMA1_Channel3_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(DMA1_Channel3_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(DMA1_Channel3_IRQn);
}

/**
 * @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_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(DEBUG_LED_GPIO_Port, DEBUG_LED_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, CHIP_SELECT_Pin | LD3_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin : DEBUG_LED_Pin */
  GPIO_InitStruct.Pin = DEBUG_LED_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(DEBUG_LED_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : CHIP_SELECT_Pin LD3_Pin */
  GPIO_InitStruct.Pin = CHIP_SELECT_Pin | LD3_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}

/* USER CODE BEGIN 4 */
void HAL_SPI_RxCpltCallback(SPI_HandleTypeDef *hspi)
{
  SPI_Rx_Done_Flag = 1;
}

void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
  // do nothing here
}

/* 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 */