/**
  ******************************************************************************
  * @file    usbd_cdc_vcp.c
  * @author  MCD Application Team
  * @version V1.1.0
  * @date    19-March-2012
  * @brief   Generic media access Layer.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2012 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */ 

#ifdef USB_OTG_HS_INTERNAL_DMA_ENABLED 
#pragma     data_alignment = 4 
#endif /* USB_OTG_HS_INTERNAL_DMA_ENABLED */

/* Includes ------------------------------------------------------------------*/
#include "usbd_cdc_core.h"
#include "usbd_conf.h"

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

/* Private function prototypes -----------------------------------------------*/
static uint16_t VCP_Init     (void);
static uint16_t VCP_DeInit   (void);
static uint16_t VCP_Ctrl     (uint32_t Cmd, uint8_t* Buf, uint32_t Len);
static uint16_t VCP_DataTx   (uint8_t* Buf, uint32_t Len);
static uint16_t VCP_DataRx   (uint8_t* Buf, uint32_t Len);

CDC_IF_Prop_TypeDef VCP_fops =  {
  VCP_Init,
  VCP_DeInit,
  VCP_Ctrl,
  VCP_DataTx,
  VCP_DataRx
};

/* Private functions ---------------------------------------------------------*/
/**
  * @brief  VCP_Init
  *         Initializes the Media on the STM32
  * @param  None
  * @retval Result of the opeartion (USBD_OK in all cases)
  */
static uint16_t VCP_Init(void) {
  return USBD_OK;
}

/**
  * @brief  VCP_DeInit
  *         DeInitializes the Media on the STM32
  * @param  None
  * @retval Result of the opeartion (USBD_OK in all cases)
  */
static uint16_t VCP_DeInit(void) {
  return USBD_OK;
}


/**
  * @brief  VCP_Ctrl
  *         Manage the CDC class requests
  * @param  Cmd: Command code            
  * @param  Buf: Buffer containing command data (request parameters)
  * @param  Len: Number of data to be sent (in bytes)
  * @retval Result of the opeartion (USBD_OK in all cases)
  */
static uint16_t VCP_Ctrl (uint32_t Cmd, uint8_t* Buf, uint32_t Len) { 
  switch (Cmd) {
    case SEND_ENCAPSULATED_COMMAND:
      /* Not  needed for this driver */
      break;
  
    case GET_ENCAPSULATED_RESPONSE:
      /* Not  needed for this driver */
      break;
  
    case SET_COMM_FEATURE:
      /* Not  needed for this driver */
      break;
  
    case GET_COMM_FEATURE:
      /* Not  needed for this driver */
      break;
  
    case CLEAR_COMM_FEATURE:
      /* Not  needed for this driver */
      break;
  
    case SET_LINE_CODING:
      /* Not  needed for this driver */
      break;
  
    case GET_LINE_CODING:
      /* Not  needed for this driver */
      break;
  
    case SET_CONTROL_LINE_STATE:
      /* Not  needed for this driver */
      break;
  
    case SEND_BREAK:
      /* Not  needed for this driver */
      break;    
      
    default:
      break;
  }

  return USBD_OK;
}

/**
  * @brief  VCP_DataTx
  *         CDC received data to be send over USB IN endpoint are managed in 
  *         this function.
  * @param  Buf: Buffer of data to be sent
  * @param  Len: Number of data to be sent (in bytes)
  * @retval Result of the opeartion: USBD_OK if all operations are OK else VCP_FAIL
  */
static uint16_t VCP_DataTx (uint8_t* Buf, uint32_t Len) {
  // this is handled externally
  return USBD_OK;
}

/**
  * @brief  VCP_DataRx
  *         Data received over USB OUT endpoint are sent over CDC interface 
  *         through this function.
  *           
  *         @note
  *         This function will block any OUT packet reception on USB endpoint 
  *         untill 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 opeartion: USBD_OK if all operations are OK else VCP_FAIL
  */
  
uint32_t vcp_buffer(uint8_t *data, uint32_t count);
  
static uint16_t VCP_DataRx (uint8_t* Buf, uint32_t Len) {
  uint32_t buffered;
  buffered = vcp_buffer(Buf, Len); // Silently ignore errors overflows
  //if(buffered < Len) return USBD_FAIL;
  return USBD_OK;
}