/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file           : usbd_cdc_if.c
 * @version        : v2.0_Cube
 * @brief          : Usb device for Virtual Com Port.
 ******************************************************************************
 * @attention
 *
 * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
 * All rights reserved.</center></h2>
 *
 * This software component is licensed by ST under Ultimate Liberty license
 * SLA0044, the "License"; You may not use this file except in compliance with
 * the License. You may obtain a copy of the License at:
 *                             www.st.com/SLA0044
 *
 ******************************************************************************
 */
/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/
#include "usbd_cdc_if.h"

/* USER CODE BEGIN INCLUDE */
#include "libSerial/serial.h"

/* USER CODE END INCLUDE */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/

/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/

/* USER CODE END PV */

/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
  * @brief Usb device library.
  * @{
  */

/** @addtogroup USBD_CDC_IF
  * @{
  */

/** @defgroup USBD_CDC_IF_Private_TypesDefinitions USBD_CDC_IF_Private_TypesDefinitions
  * @brief Private types.
  * @{
  */

/* USER CODE BEGIN PRIVATE_TYPES */

/* USER CODE END PRIVATE_TYPES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Private_Defines USBD_CDC_IF_Private_Defines
  * @brief Private defines.
  * @{
  */

/* USER CODE BEGIN PRIVATE_DEFINES */
/* USER CODE END PRIVATE_DEFINES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Private_Macros USBD_CDC_IF_Private_Macros
  * @brief Private macros.
  * @{
  */

/* USER CODE BEGIN PRIVATE_MACRO */

/* USER CODE END PRIVATE_MACRO */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Private_Variables USBD_CDC_IF_Private_Variables
  * @brief Private variables.
  * @{
  */
/* Create buffer for reception and transmission           */
/* It's up to user to redefine and/or remove those define */
/** Received data over USB are stored in this buffer      */
uint8_t UserRxBufferFS[APP_RX_DATA_SIZE];

/** Data to send over USB CDC are stored in this buffer   */
uint8_t UserTxBufferFS[APP_TX_DATA_SIZE];

/* USER CODE BEGIN PRIVATE_VARIABLES */

/* USER CODE END PRIVATE_VARIABLES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Exported_Variables USBD_CDC_IF_Exported_Variables
  * @brief Public variables.
  * @{
  */

extern USBD_HandleTypeDef hUsbDeviceFS;

/* USER CODE BEGIN EXPORTED_VARIABLES */

/* USER CODE END EXPORTED_VARIABLES */

/**
  * @}
  */

/** @defgroup USBD_CDC_IF_Private_FunctionPrototypes USBD_CDC_IF_Private_FunctionPrototypes
  * @brief Private functions declaration.
  * @{
  */

static int8_t CDC_Init_FS(void);
static int8_t CDC_DeInit_FS(void);
static int8_t CDC_Control_FS(uint8_t cmd, uint8_t* pbuf, uint16_t length);
static int8_t CDC_Receive_FS(uint8_t* pbuf, uint32_t *Len);

/* USER CODE BEGIN PRIVATE_FUNCTIONS_DECLARATION */

/* USER CODE END PRIVATE_FUNCTIONS_DECLARATION */

/**
  * @}
  */

USBD_CDC_ItfTypeDef USBD_Interface_fops_FS =
{
  CDC_Init_FS,
  CDC_DeInit_FS,
  CDC_Control_FS,
  CDC_Receive_FS
};

/* Private functions ---------------------------------------------------------*/
/**
  * @brief  Initializes the CDC media low layer over the FS USB IP
  * @retval USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_Init_FS(void)
{
  /* USER CODE BEGIN 3 */
  /* Set Application Buffers */
  USBD_CDC_SetTxBuffer (&hUsbDeviceFS, UserTxBufferFS, 0);
  USBD_CDC_SetRxBuffer (&hUsbDeviceFS, UserRxBufferFS);
  return (USBD_OK);
  /* USER CODE END 3 */
}

/**
  * @brief  DeInitializes the CDC media low layer
  * @retval USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_DeInit_FS(void)
{
  /* USER CODE BEGIN 4 */
  return (USBD_OK);
  /* USER CODE END 4 */
}

/**
  * @brief  Manage the CDC class requests
  * @param  cmd: Command code
  * @param  pbuf: Buffer containing command data (request parameters)
  * @param  length: Number of data to be sent (in bytes)
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_Control_FS(uint8_t cmd, uint8_t* pbuf, uint16_t length)
{
  /* USER CODE BEGIN 5 */
  switch (cmd)
    {
    case CDC_SEND_ENCAPSULATED_COMMAND:

      break;

    case CDC_GET_ENCAPSULATED_RESPONSE:

      break;

    case CDC_SET_COMM_FEATURE:

      break;

    case CDC_GET_COMM_FEATURE:

      break;

    case CDC_CLEAR_COMM_FEATURE:

      break;

      /*******************************************************************************/
      /* Line Coding Structure                                                       */
      /*-----------------------------------------------------------------------------*/
      /* Offset | Field       | Size | Value  | Description                          */
      /* 0      | dwDTERate   |   4  | Number |Data terminal rate, in bits per second*/
      /* 4      | bCharFormat |   1  | Number | Stop bits                            */
      /*                                        0 - 1 Stop bit                       */
      /*                                        1 - 1.5 Stop bits                    */
      /*                                        2 - 2 Stop bits                      */
      /* 5      | bParityType |  1   | Number | Parity                               */
      /*                                        0 - None                             */
      /*                                        1 - Odd                              */
      /*                                        2 - Even                             */
      /*                                        3 - Mark                             */
      /*                                        4 - Space                            */
      /* 6      | bDataBits  |   1   | Number Data bits (5, 6, 7, 8 or 16).          */
      /*******************************************************************************/
    case CDC_SET_LINE_CODING:
      {
	uint32_t rate = *((uint32_t*) pbuf);
	if (rate > 0)
	  {
	    huart1.Init.BaudRate = rate;
	    __disable_irq ();
	    HAL_UART_Init (&huart1);
	    __enable_irq ();
	  }
      }
      break;

    case CDC_GET_LINE_CODING:

      break;

    case CDC_SET_CONTROL_LINE_STATE:
      {
	uint8_t control_state = *((uint8_t*) pbuf);

	// DTR is control_state[0]
	HAL_GPIO_WritePin (USART1_TXEN_GPIO_Port, USART1_TXEN_Pin,
			   control_state & 1 ? GPIO_PIN_RESET : GPIO_PIN_SET);
	//

	// RTS is control_state[1]

      }
      return (USBD_OK);
      break;

    case CDC_SEND_BREAK:

      break;

    default:
      break;
    }

  return (USBD_OK);
  /* USER CODE END 5 */
}

/**
  * @brief  Data received over USB OUT endpoint are sent over CDC interface
  *         through this function.
  *
  *         @note
  *         This function will issue a NAK packet on any OUT packet received on
  *         USB endpoint until exiting this function. If you exit this function
  *         before transfer is complete on CDC interface (ie. using DMA controller)
  *         it will result in receiving more data while previous ones are still
  *         not sent.
  *
  * @param  Buf: Buffer of data to be received
  * @param  Len: Number of data received (in bytes)
  * @retval Result of the operation: USBD_OK if all operations are OK else USBD_FAIL
  */
static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)
{
  /* USER CODE BEGIN 6 */
  usart_ctl *instance = &uc1;
  int i = 0;

  while (i < *Len)
      PutCharSerial (instance, Buf[i++]);

  USBD_CDC_SetRxBuffer (&hUsbDeviceFS, &Buf[0]);
  USBD_CDC_ReceivePacket (&hUsbDeviceFS);
  return (USBD_OK);
  /* USER CODE END 6 */
}

/**
  * @brief  CDC_Transmit_FS
  *         Data to send over USB IN endpoint are sent over CDC interface
  *         through this function.
  *         @note
  *
  *
  * @param  Buf: Buffer of data to be sent
  * @param  Len: Number of data to be sent (in bytes)
  * @retval USBD_OK if all operations are OK else USBD_FAIL or USBD_BUSY
  */
uint8_t CDC_Transmit_FS(uint8_t* Buf, uint16_t Len)
{
  uint8_t result = USBD_OK;
  /* USER CODE BEGIN 7 */
  USBD_CDC_HandleTypeDef *hcdc =
      (USBD_CDC_HandleTypeDef*) hUsbDeviceFS.pClassData;
  if (!hcdc || hcdc->TxState != 0)
    {
      return USBD_BUSY;
    }
  USBD_CDC_SetTxBuffer (&hUsbDeviceFS, Buf, Len);
  result = USBD_CDC_TransmitPacket (&hUsbDeviceFS);
  /* USER CODE END 7 */
  return result;
}

/* USER CODE BEGIN PRIVATE_FUNCTIONS_IMPLEMENTATION */

int16_t
CDC_Poll_UART ()
{
  usart_ctl *instance = &uc1;
  int16_t chars = SerialCharsReceived (instance);
  /* flag receiving data */

  int16_t i;
  if (chars > APP_TX_DATA_SIZE)
    chars = APP_TX_DATA_SIZE;



  for (i = 0; i < chars; i++)
    {
      uint8_t c;
      c = GetCharSerial (instance);
      UserTxBufferFS[i] = c;
    }
  if (chars)
      CDC_Transmit_FS (UserTxBufferFS, chars);

  return chars;
}

/* USER CODE END PRIVATE_FUNCTIONS_IMPLEMENTATION */

/**
  * @}
  */

/**
  * @}
  */

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