/**
  ******************************************************************************
  * @file    usbd_core.c
  * @author  MCD Application Team
  * @version V2.4.2
  * @date    11-December-2015
  * @brief   This file provides all the USBD core functions.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2015 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.
  *
  ******************************************************************************
  */ 

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

/** @addtogroup STM32_USBD_DEVICE_LIBRARY
* @{
*/


/** @defgroup USBD_CORE 
* @brief usbd core module
* @{
*/ 

/** @defgroup USBD_CORE_Private_TypesDefinitions
* @{
*/ 
/**
* @}
*/ 


/** @defgroup USBD_CORE_Private_Defines
* @{
*/ 

/**
* @}
*/ 


/** @defgroup USBD_CORE_Private_Macros
* @{
*/ 
/**
* @}
*/ 




/** @defgroup USBD_CORE_Private_FunctionPrototypes
* @{
*/ 

/**
* @}
*/ 

/** @defgroup USBD_CORE_Private_Variables
* @{
*/ 

/**
* @}
*/ 

/** @defgroup USBD_CORE_Private_Functions
* @{
*/ 

/**
* @brief  USBD_Init
*         Initializes the device stack and load the class driver
* @param  pdev: device instance
* @param  pdesc: Descriptor structure address
* @param  id: Low level core index
* @retval None
*/
USBD_StatusTypeDef USBD_Init(USBD_HandleTypeDef *pdev, USBD_DescriptorsTypeDef *pdesc, uint8_t id)
{
  /* Check whether the USB Host handle is valid */
  if(pdev == NULL)
  {
    USBD_ErrLog("Invalid Device handle");
    return USBD_FAIL; 
  }
  
  /* Unlink previous class*/
  if(pdev->pClass != NULL)
  {
    pdev->pClass = NULL;
  }
  
  /* Assign USBD Descriptors */
  if(pdesc != NULL)
  {
    pdev->pDesc = pdesc;
  }
  
  /* Set Device initial State */
  pdev->dev_state  = USBD_STATE_DEFAULT;
  pdev->id = id;
  /* Initialize low level driver */
  USBD_LL_Init(pdev);
  
  return USBD_OK; 
}

/**
* @brief  USBD_DeInit 
*         Re-Initialize th device library
* @param  pdev: device instance
* @retval status: status
*/
USBD_StatusTypeDef USBD_DeInit(USBD_HandleTypeDef *pdev)
{
  /* Set Default State */
  pdev->dev_state  = USBD_STATE_DEFAULT;
  
  /* Free Class Resources */
  pdev->pClass->DeInit(pdev, pdev->dev_config);  
  
    /* Stop the low level driver  */
  USBD_LL_Stop(pdev); 
  
  /* Initialize low level driver */
  USBD_LL_DeInit(pdev);
  
  return USBD_OK;
}


/**
  * @brief  USBD_RegisterClass 
  *         Link class driver to Device Core.
  * @param  pDevice : Device Handle
  * @param  pclass: Class handle
  * @retval USBD Status
  */
USBD_StatusTypeDef  USBD_RegisterClass(USBD_HandleTypeDef *pdev, USBD_ClassTypeDef *pclass)
{
  USBD_StatusTypeDef   status = USBD_OK;
  if(pclass != 0)
  {
    /* link the class to the USB Device handle */
    pdev->pClass = pclass;
    status = USBD_OK;
  }
  else
  {
    USBD_ErrLog("Invalid Class handle");
    status = USBD_FAIL; 
  }
  
  return status;
}

/**
  * @brief  USBD_Start 
  *         Start the USB Device Core.
  * @param  pdev: Device Handle
  * @retval USBD Status
  */
USBD_StatusTypeDef  USBD_Start  (USBD_HandleTypeDef *pdev)
{
  
  /* Start the low level driver  */
  USBD_LL_Start(pdev); 
  
  return USBD_OK;  
}

/**
  * @brief  USBD_Stop 
  *         Stop the USB Device Core.
  * @param  pdev: Device Handle
  * @retval USBD Status
  */
USBD_StatusTypeDef  USBD_Stop   (USBD_HandleTypeDef *pdev)
{
  /* Free Class Resources */
  pdev->pClass->DeInit(pdev, pdev->dev_config);  

  /* Stop the low level driver  */
  USBD_LL_Stop(pdev); 
  
  return USBD_OK;  
}

/**
* @brief  USBD_RunTestMode 
*         Launch test mode process
* @param  pdev: device instance
* @retval status
*/
USBD_StatusTypeDef  USBD_RunTestMode (USBD_HandleTypeDef  *pdev) 
{
  return USBD_OK;
}


/**
* @brief  USBD_SetClassConfig 
*        Configure device and start the interface
* @param  pdev: device instance
* @param  cfgidx: configuration index
* @retval status
*/

USBD_StatusTypeDef USBD_SetClassConfig(USBD_HandleTypeDef  *pdev, uint8_t cfgidx)
{
  USBD_StatusTypeDef   ret = USBD_FAIL;
  
  if(pdev->pClass != NULL)
  {
    /* Set configuration  and Start the Class*/
    if(pdev->pClass->Init(pdev, cfgidx) == 0)
    {
      ret = USBD_OK;
    }
  }
  return ret; 
}

/**
* @brief  USBD_ClrClassConfig 
*         Clear current configuration
* @param  pdev: device instance
* @param  cfgidx: configuration index
* @retval status: USBD_StatusTypeDef
*/
USBD_StatusTypeDef USBD_ClrClassConfig(USBD_HandleTypeDef  *pdev, uint8_t cfgidx)
{
  /* Clear configuration  and De-initialize the Class process*/
  pdev->pClass->DeInit(pdev, cfgidx);  
  return USBD_OK;
}


/**
* @brief  USBD_SetupStage 
*         Handle the setup stage
* @param  pdev: device instance
* @retval status
*/
USBD_StatusTypeDef USBD_LL_SetupStage(USBD_HandleTypeDef *pdev, uint8_t *psetup)
{

  USBD_ParseSetupRequest(&pdev->request, psetup);
  
  pdev->ep0_state = USBD_EP0_SETUP;
  pdev->ep0_data_len = pdev->request.wLength;
  
  switch (pdev->request.bmRequest & 0x1F) 
  {
  case USB_REQ_RECIPIENT_DEVICE:   
    USBD_StdDevReq (pdev, &pdev->request);
    break;
    
  case USB_REQ_RECIPIENT_INTERFACE:     
    USBD_StdItfReq(pdev, &pdev->request);
    break;
    
  case USB_REQ_RECIPIENT_ENDPOINT:        
    USBD_StdEPReq(pdev, &pdev->request);   
    break;
    
  default:           
    USBD_LL_StallEP(pdev , pdev->request.bmRequest & 0x80);
    break;
  }  
  return USBD_OK;  
}

/**
* @brief  USBD_DataOutStage 
*         Handle data OUT stage
* @param  pdev: device instance
* @param  epnum: endpoint index
* @retval status
*/
USBD_StatusTypeDef USBD_LL_DataOutStage(USBD_HandleTypeDef *pdev , uint8_t epnum, uint8_t *pdata)
{
  USBD_EndpointTypeDef    *pep;
  
  if(epnum == 0) 
  {
    pep = &pdev->ep_out[0];
    
    if ( pdev->ep0_state == USBD_EP0_DATA_OUT)
    {
      if(pep->rem_length > pep->maxpacket)
      {
        pep->rem_length -=  pep->maxpacket;
       
        USBD_CtlContinueRx (pdev, 
                            pdata,
                            MIN(pep->rem_length ,pep->maxpacket));
      }
      else
      {
        if((pdev->pClass->EP0_RxReady != NULL)&&
           (pdev->dev_state == USBD_STATE_CONFIGURED))
        {
          pdev->pClass->EP0_RxReady(pdev); 
        }
        USBD_CtlSendStatus(pdev);
      }
    }
  }
  else if((pdev->pClass->DataOut != NULL)&&
          (pdev->dev_state == USBD_STATE_CONFIGURED))
  {
    pdev->pClass->DataOut(pdev, epnum); 
  }  
  return USBD_OK;
}

/**
* @brief  USBD_DataInStage 
*         Handle data in stage
* @param  pdev: device instance
* @param  epnum: endpoint index
* @retval status
*/
USBD_StatusTypeDef USBD_LL_DataInStage(USBD_HandleTypeDef *pdev ,uint8_t epnum, uint8_t *pdata)
{
  USBD_EndpointTypeDef    *pep;
    
  if(epnum == 0) 
  {
    pep = &pdev->ep_in[0];
    
    if ( pdev->ep0_state == USBD_EP0_DATA_IN)
    {
      if(pep->rem_length > pep->maxpacket)
      {
        pep->rem_length -=  pep->maxpacket;
        
        USBD_CtlContinueSendData (pdev, 
                                  pdata, 
                                  pep->rem_length);
        
        /* Prepare endpoint for premature end of transfer */
        USBD_LL_PrepareReceive (pdev,
                                0,
                                NULL,
                                0);  
      }
      else
      { /* last packet is MPS multiple, so send ZLP packet */
        if((pep->total_length % pep->maxpacket == 0) &&
           (pep->total_length >= pep->maxpacket) &&
             (pep->total_length < pdev->ep0_data_len ))
        {
          
          USBD_CtlContinueSendData(pdev , NULL, 0);
          pdev->ep0_data_len = 0;
          
        /* Prepare endpoint for premature end of transfer */
        USBD_LL_PrepareReceive (pdev,
                                0,
                                NULL,
                                0);
        }
        else
        {
          if((pdev->pClass->EP0_TxSent != NULL)&&
             (pdev->dev_state == USBD_STATE_CONFIGURED))
          {
            pdev->pClass->EP0_TxSent(pdev); 
          }          
          USBD_CtlReceiveStatus(pdev);
        }
      }
    }
    if (pdev->dev_test_mode == 1)
    {
      USBD_RunTestMode(pdev); 
      pdev->dev_test_mode = 0;
    }
  }
  else if((pdev->pClass->DataIn != NULL)&& 
          (pdev->dev_state == USBD_STATE_CONFIGURED))
  {
    pdev->pClass->DataIn(pdev, epnum); 
  }  
  return USBD_OK;
}

/**
* @brief  USBD_LL_Reset 
*         Handle Reset event
* @param  pdev: device instance
* @retval status
*/

USBD_StatusTypeDef USBD_LL_Reset(USBD_HandleTypeDef  *pdev)
{
  /* Open EP0 OUT */
  USBD_LL_OpenEP(pdev,
              0x00,
              USBD_EP_TYPE_CTRL,
              USB_MAX_EP0_SIZE);
  
  pdev->ep_out[0].maxpacket = USB_MAX_EP0_SIZE;
  
  /* Open EP0 IN */
  USBD_LL_OpenEP(pdev,
              0x80,
              USBD_EP_TYPE_CTRL,
              USB_MAX_EP0_SIZE);
  
  pdev->ep_in[0].maxpacket = USB_MAX_EP0_SIZE;
  /* Upon Reset call user call back */
  pdev->dev_state = USBD_STATE_DEFAULT;
  
  if (pdev->pClassData) 
    pdev->pClass->DeInit(pdev, pdev->dev_config);  
 
  
  return USBD_OK;
}




/**
* @brief  USBD_LL_Reset 
*         Handle Reset event
* @param  pdev: device instance
* @retval status
*/
USBD_StatusTypeDef USBD_LL_SetSpeed(USBD_HandleTypeDef  *pdev, USBD_SpeedTypeDef speed)
{
  pdev->dev_speed = speed;
  return USBD_OK;
}

/**
* @brief  USBD_Suspend 
*         Handle Suspend event
* @param  pdev: device instance
* @retval status
*/

USBD_StatusTypeDef USBD_LL_Suspend(USBD_HandleTypeDef  *pdev)
{
  pdev->dev_old_state =  pdev->dev_state;
  pdev->dev_state  = USBD_STATE_SUSPENDED;
  return USBD_OK;
}

/**
* @brief  USBD_Resume 
*         Handle Resume event
* @param  pdev: device instance
* @retval status
*/

USBD_StatusTypeDef USBD_LL_Resume(USBD_HandleTypeDef  *pdev)
{
  pdev->dev_state = pdev->dev_old_state;  
  return USBD_OK;
}

/**
* @brief  USBD_SOF 
*         Handle SOF event
* @param  pdev: device instance
* @retval status
*/

USBD_StatusTypeDef USBD_LL_SOF(USBD_HandleTypeDef  *pdev)
{
  if(pdev->dev_state == USBD_STATE_CONFIGURED)
  {
    if(pdev->pClass->SOF != NULL)
    {
      pdev->pClass->SOF(pdev);
    }
  }
  return USBD_OK;
}

/**
* @brief  USBD_IsoINIncomplete 
*         Handle iso in incomplete event
* @param  pdev: device instance
* @retval status
*/
USBD_StatusTypeDef USBD_LL_IsoINIncomplete(USBD_HandleTypeDef  *pdev, uint8_t epnum)
{
  return USBD_OK;
}

/**
* @brief  USBD_IsoOUTIncomplete 
*         Handle iso out incomplete event
* @param  pdev: device instance
* @retval status
*/
USBD_StatusTypeDef USBD_LL_IsoOUTIncomplete(USBD_HandleTypeDef  *pdev, uint8_t epnum)
{
  return USBD_OK;
}

/**
* @brief  USBD_DevConnected 
*         Handle device connection event
* @param  pdev: device instance
* @retval status
*/
USBD_StatusTypeDef USBD_LL_DevConnected(USBD_HandleTypeDef  *pdev)
{
  return USBD_OK;
}

/**
* @brief  USBD_DevDisconnected 
*         Handle device disconnection event
* @param  pdev: device instance
* @retval status
*/
USBD_StatusTypeDef USBD_LL_DevDisconnected(USBD_HandleTypeDef  *pdev)
{
  /* Free Class Resources */
  pdev->dev_state = USBD_STATE_DEFAULT;
  pdev->pClass->DeInit(pdev, pdev->dev_config);  
   
  return USBD_OK;
}
/**
* @}
*/ 


/**
* @}
*/ 


/**
* @}
*/ 

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

