rt-thread/bsp/stm32f10x-HAL/Libraries/STM32F1xx_HAL_Driver/Src/stm32f1xx_hal_pcd.c

/**
  ******************************************************************************
  * @file    stm32f1xx_hal_pcd.c
  * @author  MCD Application Team
  * @version V1.1.1
  * @date    12-May-2017
  * @brief   PCD HAL module driver.
  *          This file provides firmware functions to manage the following 
  *          functionalities of the USB Peripheral Controller:
  *           + Initialization and de-initialization functions
  *           + IO operation functions
  *           + Peripheral Control functions 
  *           + Peripheral State functions
  *
  @verbatim
  ==============================================================================
                    ##### How to use this driver #####
  ==============================================================================
    [..]
      The PCD HAL driver can be used as follows:

     (#) Declare a PCD_HandleTypeDef handle structure, for example:
         PCD_HandleTypeDef  hpcd;

     (#) Fill parameters of Init structure in HCD handle

     (#) Call HAL_PCD_Init() API to initialize the HCD peripheral (Core, Device core, ...)

     (#) Initialize the PCD low level resources through the HAL_PCD_MspInit() API:
         (##) Enable the PCD/USB Low Level interface clock using the following macro
              (+++) __HAL_RCC_USB_CLK_ENABLE(); For USB Device FS peripheral available
                    on STM32F102xx and STM32F103xx devices
              (+++) __HAL_RCC_USB_OTG_FS_CLK_ENABLE(); For USB OTG FS peripheral available
                    on STM32F105xx and STM32F107xx devices 

         (##) Initialize the related GPIO clocks
         (##) Configure PCD pin-out
         (##) Configure PCD NVIC interrupt

     (#)Associate the Upper USB device stack to the HAL PCD Driver:
         (##) hpcd.pData = pdev;

     (#)Enable HCD transmission and reception:
         (##) HAL_PCD_Start();

  @endverbatim
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32f1xx_hal.h"

/** @addtogroup STM32F1xx_HAL_Driver
  * @{
  */



#ifdef HAL_PCD_MODULE_ENABLED

#if defined(STM32F102x6) || defined(STM32F102xB) || \
    defined(STM32F103x6) || defined(STM32F103xB) || \
    defined(STM32F103xE) || defined(STM32F103xG) || \
    defined(STM32F105xC) || defined(STM32F107xC)

/** @defgroup PCD PCD
  * @brief PCD HAL module driver
  * @{
  */

/* Private types -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private constants ---------------------------------------------------------*/
/* Private macros ------------------------------------------------------------*/
/** @defgroup PCD_Private_Macros PCD Private Macros
  * @{
  */ 
#define PCD_MIN(a, b)  (((a) < (b)) ? (a) : (b))
#define PCD_MAX(a, b)  (((a) > (b)) ? (a) : (b))
/**
  * @}
  */

/* Private functions ---------------------------------------------------------*/
/** @defgroup PCD_Private_Functions PCD Private Functions
  * @{
  */
#if defined (USB_OTG_FS)
static HAL_StatusTypeDef PCD_WriteEmptyTxFifo(PCD_HandleTypeDef *hpcd, uint32_t epnum);
#endif /* USB_OTG_FS */

#if defined (USB)
static HAL_StatusTypeDef PCD_EP_ISR_Handler(PCD_HandleTypeDef *hpcd);
#endif /* USB */
/**
  * @}
  */

/* Exported functions --------------------------------------------------------*/
/** @defgroup PCD_Exported_Functions PCD Exported Functions
  * @{
  */

/** @defgroup PCD_Exported_Functions_Group1 Initialization and de-initialization functions 
 *  @brief    Initialization and Configuration functions 
 *
@verbatim
 ===============================================================================
            ##### Initialization and de-initialization functions #####
 ===============================================================================
    [..]  This section provides functions allowing to:
 
@endverbatim
  * @{
  */

/**
  * @brief  Initializes the PCD according to the specified
  *         parameters in the PCD_InitTypeDef and create the associated handle.
  * @param  hpcd: PCD handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_Init(PCD_HandleTypeDef *hpcd)
{
  uint32_t index = 0U;
  
  /* Check the PCD handle allocation */
  if(hpcd == NULL)
  {
    return HAL_ERROR;
  }
  
  /* Check the parameters */
  assert_param(IS_PCD_ALL_INSTANCE(hpcd->Instance));

  if(hpcd->State == HAL_PCD_STATE_RESET)
  {  
    /* Allocate lock resource and initialize it */
    hpcd->Lock = HAL_UNLOCKED;

    /* Init the low level hardware : GPIO, CLOCK, NVIC... */
    HAL_PCD_MspInit(hpcd);
  }
  
  hpcd->State = HAL_PCD_STATE_BUSY;
  
  /* Disable the Interrupts */
  __HAL_PCD_DISABLE(hpcd);

  /*Init the Core (common init.) */
  USB_CoreInit(hpcd->Instance, hpcd->Init);
 
  /* Force Device Mode*/
  USB_SetCurrentMode(hpcd->Instance , USB_DEVICE_MODE);
 
  /* Init endpoints structures */
  for (index = 0U; index < 15U ; index++)
  {
    /* Init ep structure */
    hpcd->IN_ep[index].is_in = 1U;
    hpcd->IN_ep[index].num = index;
    hpcd->IN_ep[index].tx_fifo_num = index;
    /* Control until ep is actvated */
    hpcd->IN_ep[index].type = EP_TYPE_CTRL;
    hpcd->IN_ep[index].maxpacket =  0U;
    hpcd->IN_ep[index].xfer_buff = 0U;
    hpcd->IN_ep[index].xfer_len = 0U;
  }
 
  for (index = 0U; index < 15U ; index++)
  {
    hpcd->OUT_ep[index].is_in = 0U;
    hpcd->OUT_ep[index].num = index;
    hpcd->IN_ep[index].tx_fifo_num = index;
    /* Control until ep is activated */
    hpcd->OUT_ep[index].type = EP_TYPE_CTRL;
    hpcd->OUT_ep[index].maxpacket = 0U;
    hpcd->OUT_ep[index].xfer_buff = 0U;
    hpcd->OUT_ep[index].xfer_len = 0U;
  }
  
  /* Init Device */
  USB_DevInit(hpcd->Instance, hpcd->Init);
  
  hpcd->USB_Address = 0U;
  hpcd->State= HAL_PCD_STATE_READY;
  
  USB_DevDisconnect (hpcd->Instance);  
  return HAL_OK;
}

/**
  * @brief  DeInitializes the PCD peripheral 
  * @param  hpcd: PCD handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_DeInit(PCD_HandleTypeDef *hpcd)
{
  /* Check the PCD handle allocation */
  if(hpcd == NULL)
  {
    return HAL_ERROR;
  }

  hpcd->State = HAL_PCD_STATE_BUSY;
  
  /* Stop Device */
  HAL_PCD_Stop(hpcd);
  
  /* DeInit the low level hardware */
  HAL_PCD_MspDeInit(hpcd);
  
  hpcd->State = HAL_PCD_STATE_RESET; 
  
  return HAL_OK;
}

/**
  * @brief  Initializes the PCD MSP.
  * @param  hpcd: PCD handle
  * @retval None
  */
__weak void HAL_PCD_MspInit(PCD_HandleTypeDef *hpcd)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_MspInit could be implemented in the user file
   */
}

/**
  * @brief  DeInitializes PCD MSP.
  * @param  hpcd: PCD handle
  * @retval None
  */
__weak void HAL_PCD_MspDeInit(PCD_HandleTypeDef *hpcd)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_MspDeInit could be implemented in the user file
   */
}

/**
  * @}
  */

/** @defgroup PCD_Exported_Functions_Group2 IO operation functions 
 *  @brief   Data transfers functions 
 *
@verbatim
 ===============================================================================
                      ##### IO operation functions #####
 ===============================================================================
    [..]
    This subsection provides a set of functions allowing to manage the PCD data 
    transfers.

@endverbatim
  * @{
  */

/**
  * @brief  Start The USB Device.
  * @param  hpcd: PCD handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_Start(PCD_HandleTypeDef *hpcd)
{
  __HAL_LOCK(hpcd);
  HAL_PCDEx_SetConnectionState (hpcd, 1);
  USB_DevConnect (hpcd->Instance);
  __HAL_PCD_ENABLE(hpcd);
  __HAL_UNLOCK(hpcd);
  return HAL_OK;
}

/**
  * @brief  Stop The USB Device.
  * @param  hpcd: PCD handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_Stop(PCD_HandleTypeDef *hpcd)
{
  __HAL_LOCK(hpcd);
  __HAL_PCD_DISABLE(hpcd);
  USB_StopDevice(hpcd->Instance);
  USB_DevDisconnect (hpcd->Instance);
  __HAL_UNLOCK(hpcd);
  return HAL_OK;
}

#if defined (USB_OTG_FS)
/**
  * @brief  This function handles PCD interrupt request.
  * @param  hpcd: PCD handle
  * @retval HAL status
  */
void HAL_PCD_IRQHandler(PCD_HandleTypeDef *hpcd)
{
  USB_OTG_GlobalTypeDef *USBx = hpcd->Instance;
  uint32_t index = 0U, ep_intr = 0U, epint = 0U, epnum = 0U;
  uint32_t fifoemptymsk = 0U, temp = 0U;
  USB_OTG_EPTypeDef *ep = NULL;
  
  /* ensure that we are in device mode */
  if (USB_GetMode(hpcd->Instance) == USB_OTG_MODE_DEVICE)
  {
    /* avoid spurious interrupt */
    if(__HAL_PCD_IS_INVALID_INTERRUPT(hpcd))
    {
      return;
    }
    
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_MMIS))
    {
     /* incorrect mode, acknowledge the interrupt */
      __HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_MMIS);
    }
    
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_OEPINT))
    {
      epnum = 0U;
      
      /* Read in the device interrupt bits */
      ep_intr = USB_ReadDevAllOutEpInterrupt(hpcd->Instance);
      
      while ( ep_intr )
      {
        if (ep_intr & 0x1U)
        {
          epint = USB_ReadDevOutEPInterrupt(hpcd->Instance, epnum);
          
          if(( epint & USB_OTG_DOEPINT_XFRC) == USB_OTG_DOEPINT_XFRC)
          {
            CLEAR_OUT_EP_INTR(epnum, USB_OTG_DOEPINT_XFRC);
            
            HAL_PCD_DataOutStageCallback(hpcd, epnum);
          }
          
          if(( epint & USB_OTG_DOEPINT_STUP) == USB_OTG_DOEPINT_STUP)
          {
            /* Inform the upper layer that a setup packet is available */
            HAL_PCD_SetupStageCallback(hpcd);
            CLEAR_OUT_EP_INTR(epnum, USB_OTG_DOEPINT_STUP);
          }
          
          if(( epint & USB_OTG_DOEPINT_OTEPDIS) == USB_OTG_DOEPINT_OTEPDIS)
          {
            CLEAR_OUT_EP_INTR(epnum, USB_OTG_DOEPINT_OTEPDIS);
          }
        }
        epnum++;
        ep_intr >>= 1U;
      }
    }
    
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_IEPINT))
    {
      /* Read in the device interrupt bits */
      ep_intr = USB_ReadDevAllInEpInterrupt(hpcd->Instance);
      
      epnum = 0U;
      
      while ( ep_intr )
      {
        if (ep_intr & 0x1U) /* In ITR */
        {
          epint = USB_ReadDevInEPInterrupt(hpcd->Instance, epnum);

          if(( epint & USB_OTG_DIEPINT_XFRC) == USB_OTG_DIEPINT_XFRC)
          {
            fifoemptymsk = 0x1U << epnum;
            USBx_DEVICE->DIEPEMPMSK &= ~fifoemptymsk;
            
            CLEAR_IN_EP_INTR(epnum, USB_OTG_DIEPINT_XFRC);
            
            HAL_PCD_DataInStageCallback(hpcd, epnum);
          }
          if(( epint & USB_OTG_DIEPINT_TOC) == USB_OTG_DIEPINT_TOC)
          {
            CLEAR_IN_EP_INTR(epnum, USB_OTG_DIEPINT_TOC);
          }
          if(( epint & USB_OTG_DIEPINT_ITTXFE) == USB_OTG_DIEPINT_ITTXFE)
          {
            CLEAR_IN_EP_INTR(epnum, USB_OTG_DIEPINT_ITTXFE);
          }
          if(( epint & USB_OTG_DIEPINT_INEPNE) == USB_OTG_DIEPINT_INEPNE)
          {
            CLEAR_IN_EP_INTR(epnum, USB_OTG_DIEPINT_INEPNE);
          }
          if(( epint & USB_OTG_DIEPINT_EPDISD) == USB_OTG_DIEPINT_EPDISD)
          {
            CLEAR_IN_EP_INTR(epnum, USB_OTG_DIEPINT_EPDISD);
          }
          if(( epint & USB_OTG_DIEPINT_TXFE) == USB_OTG_DIEPINT_TXFE)
          {
            PCD_WriteEmptyTxFifo(hpcd , epnum);
          }
        }
        epnum++;
        ep_intr >>= 1U;
      }
    }
    
    /* Handle Resume Interrupt */
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_WKUINT))
    {
     /* Clear the Remote Wake-up signalling */
      USBx_DEVICE->DCTL &= ~USB_OTG_DCTL_RWUSIG;
     
     HAL_PCD_ResumeCallback(hpcd);
     
     __HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_WKUINT);
    }
    
    /* Handle Suspend Interrupt */
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_USBSUSP))
    {
      if((USBx_DEVICE->DSTS & USB_OTG_DSTS_SUSPSTS) == USB_OTG_DSTS_SUSPSTS)
      {
        
        HAL_PCD_SuspendCallback(hpcd);
      }
      __HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_USBSUSP);
    }

    /* Handle Reset Interrupt */
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_USBRST))
    {
      USBx_DEVICE->DCTL &= ~USB_OTG_DCTL_RWUSIG; 
      USB_FlushTxFifo(hpcd->Instance ,  0x10U);
      
      for (index = 0U; index < hpcd->Init.dev_endpoints ; index++)
      {
        USBx_INEP(index)->DIEPINT = 0xFFU;
        USBx_OUTEP(index)->DOEPINT = 0xFFU;
      }
      USBx_DEVICE->DAINT = 0xFFFFFFFFU;
      USBx_DEVICE->DAINTMSK |= 0x10001U;
      
      USBx_DEVICE->DOEPMSK |= (USB_OTG_DOEPMSK_STUPM | USB_OTG_DOEPMSK_XFRCM | USB_OTG_DOEPMSK_EPDM);
      USBx_DEVICE->DIEPMSK |= (USB_OTG_DIEPMSK_TOM | USB_OTG_DIEPMSK_XFRCM | USB_OTG_DIEPMSK_EPDM);
      
      /* Set Default Address to 0 */
      USBx_DEVICE->DCFG &= ~USB_OTG_DCFG_DAD;
      
      /* setup EP0 to receive SETUP packets */
      USB_EP0_OutStart(hpcd->Instance, (uint8_t *)hpcd->Setup);
      
      __HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_USBRST);
    }
    
    /* Handle Enumeration done Interrupt */
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_ENUMDNE))
    {
      USB_ActivateSetup(hpcd->Instance);
      hpcd->Instance->GUSBCFG &= ~USB_OTG_GUSBCFG_TRDT;
      
      hpcd->Init.speed            = USB_OTG_SPEED_FULL;
      hpcd->Init.ep0_mps          = USB_OTG_FS_MAX_PACKET_SIZE ;
      hpcd->Instance->GUSBCFG |= (uint32_t)((USBD_FS_TRDT_VALUE << 10U) & USB_OTG_GUSBCFG_TRDT);
      
      HAL_PCD_ResetCallback(hpcd);
      
      __HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_ENUMDNE);
    }

    /* Handle RxQLevel Interrupt */
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_RXFLVL))
    {
      USB_MASK_INTERRUPT(hpcd->Instance, USB_OTG_GINTSTS_RXFLVL);
      temp = USBx->GRXSTSP;
      ep = &hpcd->OUT_ep[temp & USB_OTG_GRXSTSP_EPNUM];
      
      if(((temp & USB_OTG_GRXSTSP_PKTSTS) >> 17U) ==  STS_DATA_UPDT)
      {
        if((temp & USB_OTG_GRXSTSP_BCNT) != 0U)
        {
          USB_ReadPacket(USBx, ep->xfer_buff, (temp & USB_OTG_GRXSTSP_BCNT) >> 4U);
          ep->xfer_buff += (temp & USB_OTG_GRXSTSP_BCNT) >> 4U;
          ep->xfer_count += (temp & USB_OTG_GRXSTSP_BCNT) >> 4U;
        }
      }
      else if (((temp & USB_OTG_GRXSTSP_PKTSTS) >> 17U) ==  STS_SETUP_UPDT)
      {
        USB_ReadPacket(USBx, (uint8_t *)hpcd->Setup, 8U);
        ep->xfer_count += (temp & USB_OTG_GRXSTSP_BCNT) >> 4U;
      }
      USB_UNMASK_INTERRUPT(hpcd->Instance, USB_OTG_GINTSTS_RXFLVL);
    }
    
    /* Handle SOF Interrupt */
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_SOF))
    {
      HAL_PCD_SOFCallback(hpcd);
      __HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_SOF);
    }
    
    /* Handle Incomplete ISO IN Interrupt */
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_IISOIXFR))
    {
      HAL_PCD_ISOINIncompleteCallback(hpcd, epnum);
      __HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_IISOIXFR);
    }
    
    /* Handle Incomplete ISO OUT Interrupt */
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_PXFR_INCOMPISOOUT))
    {
      HAL_PCD_ISOOUTIncompleteCallback(hpcd, epnum);
      __HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_PXFR_INCOMPISOOUT);
    }
    
    /* Handle Connection event Interrupt */
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_SRQINT))
    {
      HAL_PCD_ConnectCallback(hpcd);
      __HAL_PCD_CLEAR_FLAG(hpcd, USB_OTG_GINTSTS_SRQINT);
    }
    
    /* Handle Disconnection event Interrupt */
    if(__HAL_PCD_GET_FLAG(hpcd, USB_OTG_GINTSTS_OTGINT))
    {
      temp = hpcd->Instance->GOTGINT;
      
      if((temp & USB_OTG_GOTGINT_SEDET) == USB_OTG_GOTGINT_SEDET)
      {
        HAL_PCD_DisconnectCallback(hpcd);
      }
      hpcd->Instance->GOTGINT |= temp;
    }
  }
}
#endif /* USB_OTG_FS */

#if defined (USB)
/**
  * @brief  This function handles PCD interrupt request.
  * @param  hpcd: PCD handle
  * @retval HAL status
  */
void HAL_PCD_IRQHandler(PCD_HandleTypeDef *hpcd)
{ 
  if (__HAL_PCD_GET_FLAG (hpcd, USB_ISTR_CTR))
  {
    /* servicing of the endpoint correct transfer interrupt */
    /* clear of the CTR flag into the sub */
    PCD_EP_ISR_Handler(hpcd);
  }

  if (__HAL_PCD_GET_FLAG (hpcd, USB_ISTR_RESET))
  {
    __HAL_PCD_CLEAR_FLAG(hpcd, USB_ISTR_RESET);
    HAL_PCD_ResetCallback(hpcd);
    HAL_PCD_SetAddress(hpcd, 0U);
  }

  if (__HAL_PCD_GET_FLAG (hpcd, USB_ISTR_PMAOVR))
  {
    __HAL_PCD_CLEAR_FLAG(hpcd, USB_ISTR_PMAOVR);    
  }
  if (__HAL_PCD_GET_FLAG (hpcd, USB_ISTR_ERR))
  {
    __HAL_PCD_CLEAR_FLAG(hpcd, USB_ISTR_ERR); 
  }

  if (__HAL_PCD_GET_FLAG (hpcd, USB_ISTR_WKUP))
  {
    hpcd->Instance->CNTR &= ~(USB_CNTR_LP_MODE);
    hpcd->Instance->CNTR &= ~(USB_CNTR_FSUSP);
    
    HAL_PCD_ResumeCallback(hpcd);

    __HAL_PCD_CLEAR_FLAG(hpcd, USB_ISTR_WKUP);     
  }

  if (__HAL_PCD_GET_FLAG (hpcd, USB_ISTR_SUSP))
  { 
    /* Force low-power mode in the macrocell */
    hpcd->Instance->CNTR |= USB_CNTR_FSUSP;
    
    /* clear of the ISTR bit must be done after setting of CNTR_FSUSP */
    __HAL_PCD_CLEAR_FLAG(hpcd, USB_ISTR_SUSP);  

    hpcd->Instance->CNTR |= USB_CNTR_LP_MODE;
    if (__HAL_PCD_GET_FLAG (hpcd, USB_ISTR_WKUP) == 0U)
    {
      HAL_PCD_SuspendCallback(hpcd);
    }
  }

  if (__HAL_PCD_GET_FLAG (hpcd, USB_ISTR_SOF))
  {
    __HAL_PCD_CLEAR_FLAG(hpcd, USB_ISTR_SOF); 
    HAL_PCD_SOFCallback(hpcd);
  }

  if (__HAL_PCD_GET_FLAG (hpcd, USB_ISTR_ESOF))
  {
    /* clear ESOF flag in ISTR */
    __HAL_PCD_CLEAR_FLAG(hpcd, USB_ISTR_ESOF); 
  }
}
#endif /* USB */

/**
  * @brief  Data out stage callbacks
  * @param  hpcd: PCD handle
  * @param  epnum: endpoint number
  * @retval None
  */
 __weak void HAL_PCD_DataOutStageCallback(PCD_HandleTypeDef *hpcd, uint8_t epnum)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  UNUSED(epnum);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_DataOutStageCallback could be implemented in the user file
   */
}

/**
  * @brief  Data IN stage callbacks
  * @param  hpcd: PCD handle
  * @param  epnum: endpoint number
  * @retval None
  */
 __weak void HAL_PCD_DataInStageCallback(PCD_HandleTypeDef *hpcd, uint8_t epnum)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  UNUSED(epnum);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_DataInStageCallback could be implemented in the user file
   */
}
/**
  * @brief  Setup stage callback
  * @param  hpcd: PCD handle
  * @retval None
  */
 __weak void HAL_PCD_SetupStageCallback(PCD_HandleTypeDef *hpcd)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_SetupStageCallback could be implemented in the user file
   */
}

/**
  * @brief  USB Start Of Frame callbacks
  * @param  hpcd: PCD handle
  * @retval None
  */
 __weak void HAL_PCD_SOFCallback(PCD_HandleTypeDef *hpcd)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_SOFCallback could be implemented in the user file
   */
}

/**
  * @brief  USB Reset callbacks
  * @param  hpcd: PCD handle
  * @retval None
  */
 __weak void HAL_PCD_ResetCallback(PCD_HandleTypeDef *hpcd)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_ResetCallback could be implemented in the user file
   */
}

/**
  * @brief  Suspend event callbacks
  * @param  hpcd: PCD handle
  * @retval None
  */
 __weak void HAL_PCD_SuspendCallback(PCD_HandleTypeDef *hpcd)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_SuspendCallback could be implemented in the user file
   */
}

/**
  * @brief  Resume event callbacks
  * @param  hpcd: PCD handle
  * @retval None
  */
 __weak void HAL_PCD_ResumeCallback(PCD_HandleTypeDef *hpcd)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_ResumeCallback could be implemented in the user file
   */
}

/**
  * @brief  Incomplete ISO OUT callbacks
  * @param  hpcd: PCD handle
  * @param  epnum: endpoint number
  * @retval None
  */
 __weak void HAL_PCD_ISOOUTIncompleteCallback(PCD_HandleTypeDef *hpcd, uint8_t epnum)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  UNUSED(epnum);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_ISOOUTIncompleteCallback could be implemented in the user file
   */
}

/**
  * @brief  Incomplete ISO IN  callbacks
  * @param  hpcd: PCD handle
  * @param  epnum: endpoint number
  * @retval None
  */
 __weak void HAL_PCD_ISOINIncompleteCallback(PCD_HandleTypeDef *hpcd, uint8_t epnum)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  UNUSED(epnum);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_ISOINIncompleteCallback could be implemented in the user file
   */
}

/**
  * @brief  Connection event callbacks
  * @param  hpcd: PCD handle
  * @retval None
  */
 __weak void HAL_PCD_ConnectCallback(PCD_HandleTypeDef *hpcd)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_ConnectCallback could be implemented in the user file
   */
}

/**
  * @brief  Disconnection event callbacks
  * @param  hpcd: PCD handle
  * @retval None
  */
 __weak void HAL_PCD_DisconnectCallback(PCD_HandleTypeDef *hpcd)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hpcd);
  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_PCD_DisconnectCallback could be implemented in the user file
   */
}

/**
  * @}
  */

/** @defgroup PCD_Exported_Functions_Group3 Peripheral Control functions
 *  @brief   management functions
 *
@verbatim
 ===============================================================================
                      ##### Peripheral Control functions #####
 ===============================================================================  
    [..]
    This subsection provides a set of functions allowing to control the PCD data 
    transfers.

@endverbatim
  * @{
  */

/**
  * @brief  Connect the USB device
  * @param  hpcd: PCD handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_DevConnect(PCD_HandleTypeDef *hpcd)
{
  __HAL_LOCK(hpcd);
  HAL_PCDEx_SetConnectionState (hpcd, 1);
  USB_DevConnect(hpcd->Instance);
  __HAL_UNLOCK(hpcd);
  return HAL_OK;
}

/**
  * @brief  Disconnect the USB device
  * @param  hpcd: PCD handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_DevDisconnect(PCD_HandleTypeDef *hpcd)
{
  __HAL_LOCK(hpcd);
  HAL_PCDEx_SetConnectionState (hpcd, 0U);
  USB_DevDisconnect(hpcd->Instance);
  __HAL_UNLOCK(hpcd);
  return HAL_OK;
}

/**
  * @brief  Set the USB Device address
  * @param  hpcd: PCD handle
  * @param  address: new device address
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_SetAddress(PCD_HandleTypeDef *hpcd, uint8_t address)
{
  __HAL_LOCK(hpcd);
  hpcd->USB_Address = address;
  USB_SetDevAddress(hpcd->Instance, address);
  __HAL_UNLOCK(hpcd);
  return HAL_OK;
}
/**
  * @brief  Open and configure an endpoint
  * @param  hpcd: PCD handle
  * @param  ep_addr: endpoint address
  * @param  ep_mps: endpoint max packet size
  * @param  ep_type: endpoint type   
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_EP_Open(PCD_HandleTypeDef *hpcd, uint8_t ep_addr, uint16_t ep_mps, uint8_t ep_type)
{
  HAL_StatusTypeDef  ret = HAL_OK;
  PCD_EPTypeDef *ep = NULL;
  
  if ((ep_addr & 0x80U) == 0x80U)
  {
    ep = &hpcd->IN_ep[ep_addr & 0x7FU];
  }
  else
  {
    ep = &hpcd->OUT_ep[ep_addr & 0x7FU];
  }
  ep->num   = ep_addr & 0x7FU;
  
  ep->is_in = (0x80U & ep_addr) != 0U;
  ep->maxpacket = ep_mps;
  ep->type = ep_type;
    
  __HAL_LOCK(hpcd);
  USB_ActivateEndpoint(hpcd->Instance , ep);
  __HAL_UNLOCK(hpcd);
  return ret;
}

/**
  * @brief  Deactivate an endpoint
  * @param  hpcd: PCD handle
  * @param  ep_addr: endpoint address
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_EP_Close(PCD_HandleTypeDef *hpcd, uint8_t ep_addr)
{  
  PCD_EPTypeDef *ep = NULL;
  
  if ((ep_addr & 0x80U) == 0x80U)
  {
    ep = &hpcd->IN_ep[ep_addr & 0x7FU];
  }
  else
  {
    ep = &hpcd->OUT_ep[ep_addr & 0x7FU];
  }
  ep->num   = ep_addr & 0x7FU;
  
  ep->is_in = (0x80U & ep_addr) != 0U;
  
  __HAL_LOCK(hpcd);
  USB_DeactivateEndpoint(hpcd->Instance , ep);
  __HAL_UNLOCK(hpcd);
  return HAL_OK;
}


/**
  * @brief  Receive an amount of data
  * @param  hpcd: PCD handle
  * @param  ep_addr: endpoint address
  * @param  pBuf: pointer to the reception buffer
  * @param  len: amount of data to be received
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_EP_Receive(PCD_HandleTypeDef *hpcd, uint8_t ep_addr, uint8_t *pBuf, uint32_t len)
{
  PCD_EPTypeDef *ep = NULL;
  
  ep = &hpcd->OUT_ep[ep_addr & 0x7FU];
  
  /*setup and start the Xfer */
  ep->xfer_buff = pBuf;  
  ep->xfer_len = len;
  ep->xfer_count = 0U;
  ep->is_in = 0U;
  ep->num = ep_addr & 0x7FU;

  if ((ep_addr & 0x7FU) == 0U)
  {
    USB_EP0StartXfer(hpcd->Instance , ep);
  }
  else
  {
    USB_EPStartXfer(hpcd->Instance , ep);
  }

  return HAL_OK;
}

/**
  * @brief  Get Received Data Size
  * @param  hpcd: PCD handle
  * @param  ep_addr: endpoint address
  * @retval Data Size
  */
uint16_t HAL_PCD_EP_GetRxCount(PCD_HandleTypeDef *hpcd, uint8_t ep_addr)
{
  return hpcd->OUT_ep[ep_addr & 0xF].xfer_count;
}
/**
  * @brief  Send an amount of data
  * @param  hpcd: PCD handle
  * @param  ep_addr: endpoint address
  * @param  pBuf: pointer to the transmission buffer
  * @param  len: amount of data to be sent
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_EP_Transmit(PCD_HandleTypeDef *hpcd, uint8_t ep_addr, uint8_t *pBuf, uint32_t len)
{
  PCD_EPTypeDef *ep = NULL;
  
  ep = &hpcd->IN_ep[ep_addr & 0x7FU];
  
  /*setup and start the Xfer */
  ep->xfer_buff = pBuf;  
  ep->xfer_len = len;
  ep->xfer_count = 0U;
  ep->is_in = 1U;
  ep->num = ep_addr & 0x7FU;

  if ((ep_addr & 0x7FU) == 0U)
  {
    USB_EP0StartXfer(hpcd->Instance , ep);
  }
  else
  {
    USB_EPStartXfer(hpcd->Instance , ep);
  }

  return HAL_OK;
}

/**
  * @brief  Set a STALL condition over an endpoint
  * @param  hpcd: PCD handle
  * @param  ep_addr: endpoint address
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_EP_SetStall(PCD_HandleTypeDef *hpcd, uint8_t ep_addr)
{
  PCD_EPTypeDef *ep = NULL;
  
  if ((0x80U & ep_addr) == 0x80U)
  {
    ep = &hpcd->IN_ep[ep_addr & 0x7FU];
  }
  else
  {
    ep = &hpcd->OUT_ep[ep_addr];
  }
  
  ep->is_stall = 1U;
  ep->num   = ep_addr & 0x7FU;
  ep->is_in = ((ep_addr & 0x80U) == 0x80U);
  
  __HAL_LOCK(hpcd);
  USB_EPSetStall(hpcd->Instance , ep);
  if((ep_addr & 0x7FU) == 0U)
  {
    USB_EP0_OutStart(hpcd->Instance, (uint8_t *)hpcd->Setup);
  }
  __HAL_UNLOCK(hpcd); 
  
  return HAL_OK;
}

/**
  * @brief  Clear a STALL condition over in an endpoint
  * @param  hpcd: PCD handle
  * @param  ep_addr: endpoint address
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_EP_ClrStall(PCD_HandleTypeDef *hpcd, uint8_t ep_addr)
{
  PCD_EPTypeDef *ep = NULL;
  
  if ((0x80U & ep_addr) == 0x80U)
  {
    ep = &hpcd->IN_ep[ep_addr & 0x7FU];
  }
  else
  {
    ep = &hpcd->OUT_ep[ep_addr];
  }
  
  ep->is_stall = 0U;
  ep->num   = ep_addr & 0x7FU;
  ep->is_in = ((ep_addr & 0x80U) == 0x80U);
  
  __HAL_LOCK(hpcd); 
  USB_EPClearStall(hpcd->Instance , ep);
  __HAL_UNLOCK(hpcd); 
  
  return HAL_OK;
}

/**
  * @brief  Flush an endpoint
  * @param  hpcd: PCD handle
  * @param  ep_addr: endpoint address
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_EP_Flush(PCD_HandleTypeDef *hpcd, uint8_t ep_addr)
{
  __HAL_LOCK(hpcd);
  
  if ((ep_addr & 0x80U) == 0x80U)
  {
    USB_FlushTxFifo(hpcd->Instance, ep_addr & 0x7FU);
  }
  else
  {
    USB_FlushRxFifo(hpcd->Instance);
  }
  
  __HAL_UNLOCK(hpcd); 
  
  return HAL_OK;
}

/**
  * @brief  HAL_PCD_ActivateRemoteWakeup : active remote wakeup signalling
  * @param  hpcd: PCD handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_ActivateRemoteWakeup(PCD_HandleTypeDef *hpcd)
{
  return(USB_ActivateRemoteWakeup(hpcd->Instance));
}

/**
  * @brief  HAL_PCD_DeActivateRemoteWakeup : de-active remote wakeup signalling
  * @param  hpcd: PCD handle
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_PCD_DeActivateRemoteWakeup(PCD_HandleTypeDef *hpcd)
{
  return(USB_DeActivateRemoteWakeup(hpcd->Instance));
}
/**
  * @}
  */
  
/** @defgroup PCD_Exported_Functions_Group4 Peripheral State functions 
 *  @brief   Peripheral State functions
 *
@verbatim
 ===============================================================================
                      ##### Peripheral State functions #####
 ===============================================================================
    [..]
    This subsection permits to get in run-time the status of the peripheral 
    and the data flow.

@endverbatim
  * @{
  */

/**
  * @brief  Return the PCD state
  * @param  hpcd: PCD handle
  * @retval HAL state
  */
PCD_StateTypeDef HAL_PCD_GetState(PCD_HandleTypeDef *hpcd)
{
  return hpcd->State;
}

/**
  * @}
  */

/**
  * @}
  */

/** @addtogroup PCD_Private_Functions
  * @{
  */
#if defined (USB_OTG_FS)
/**
  * @brief  DCD_WriteEmptyTxFifo
  *         check FIFO for the next packet to be loaded
  * @param  hpcd: PCD handle
  * @param  epnum : endpoint number
  *          This parameter can be a value from 0 to 15  
  * @retval HAL status
  */
static HAL_StatusTypeDef PCD_WriteEmptyTxFifo(PCD_HandleTypeDef *hpcd, uint32_t epnum)
{
  USB_OTG_GlobalTypeDef *USBx = hpcd->Instance;  
  USB_OTG_EPTypeDef *ep = NULL;
  int32_t len = 0;
  uint32_t len32b = 0U;
  uint32_t fifoemptymsk = 0U;
  
  ep = &hpcd->IN_ep[epnum];
  len = ep->xfer_len - ep->xfer_count;
  
  if (len > ep->maxpacket)
  {
    len = ep->maxpacket;
  }
  
  len32b = (len + 3U) / 4U;
  
  while ((USBx_INEP(epnum)->DTXFSTS & USB_OTG_DTXFSTS_INEPTFSAV) > len32b &&
         ep->xfer_count < ep->xfer_len &&
         ep->xfer_len != 0U)
  {
    /* Write the FIFO */
    len = ep->xfer_len - ep->xfer_count;
    
    if ((uint32_t)len > ep->maxpacket)
    {
      len = ep->maxpacket;
    }
    len32b = (len + 3U) / 4U;
    
    USB_WritePacket(USBx, ep->xfer_buff, epnum, len);
    
    ep->xfer_buff  += len;
    ep->xfer_count += len;
  }
  
  if(len <= 0)
  {
    fifoemptymsk = 0x01U << epnum;
    USBx_DEVICE->DIEPEMPMSK &= ~fifoemptymsk;
    
  }
  
  return HAL_OK;
}
#endif /* USB_OTG_FS */

#if defined (USB)
/**
  * @brief  This function handles PCD Endpoint interrupt request.
  * @param  hpcd: PCD handle
  * @retval HAL status
  */
static HAL_StatusTypeDef PCD_EP_ISR_Handler(PCD_HandleTypeDef *hpcd)
{
  PCD_EPTypeDef *ep = NULL;
  uint16_t count = 0;
  uint8_t epindex = 0;
  __IO uint16_t wIstr = 0;  
  __IO uint16_t wEPVal = 0;
  
  /* stay in loop while pending interrupts */
  while (((wIstr = hpcd->Instance->ISTR) & USB_ISTR_CTR) != 0)
  {
    /* extract highest priority endpoint number */
    epindex = (uint8_t)(wIstr & USB_ISTR_EP_ID);
    
    if (epindex == 0)
    {
      /* Decode and service control endpoint interrupt */
      
      /* DIR bit = origin of the interrupt */   
      if ((wIstr & USB_ISTR_DIR) == 0)
      {
        /* DIR = 0 */
        
        /* DIR = 0      => IN  int */
        /* DIR = 0 implies that (EP_CTR_TX = 1) always  */
        PCD_CLEAR_TX_EP_CTR(hpcd->Instance, PCD_ENDP0);
        ep = &hpcd->IN_ep[0];
        
        ep->xfer_count = PCD_GET_EP_TX_CNT(hpcd->Instance, ep->num);
        ep->xfer_buff += ep->xfer_count;
 
        /* TX COMPLETE */
        HAL_PCD_DataInStageCallback(hpcd, 0U);
        
        
        if((hpcd->USB_Address > 0U)&& ( ep->xfer_len == 0U))
        {
          hpcd->Instance->DADDR = (hpcd->USB_Address | USB_DADDR_EF);
          hpcd->USB_Address = 0U;
        }
        
      }
      else
      {
        /* DIR = 1 */
        
        /* DIR = 1 & CTR_RX       => SETUP or OUT int */
        /* DIR = 1 & (CTR_TX | CTR_RX) => 2 int pending */
        ep = &hpcd->OUT_ep[0U];
        wEPVal = PCD_GET_ENDPOINT(hpcd->Instance, PCD_ENDP0);
        
        if ((wEPVal & USB_EP_SETUP) != 0U)
        {
          /* Get SETUP Packet*/
          ep->xfer_count = PCD_GET_EP_RX_CNT(hpcd->Instance, ep->num);
          USB_ReadPMA(hpcd->Instance, (uint8_t*)hpcd->Setup ,ep->pmaadress , ep->xfer_count);       
          /* SETUP bit kept frozen while CTR_RX = 1*/ 
          PCD_CLEAR_RX_EP_CTR(hpcd->Instance, PCD_ENDP0); 
          
          /* Process SETUP Packet*/
          HAL_PCD_SetupStageCallback(hpcd);
        }
        
        else if ((wEPVal & USB_EP_CTR_RX) != 0U)
        {
          PCD_CLEAR_RX_EP_CTR(hpcd->Instance, PCD_ENDP0);
          /* Get Control Data OUT Packet*/
          ep->xfer_count = PCD_GET_EP_RX_CNT(hpcd->Instance, ep->num);
          
          if (ep->xfer_count != 0U)
          {
            USB_ReadPMA(hpcd->Instance, ep->xfer_buff, ep->pmaadress, ep->xfer_count);
            ep->xfer_buff+=ep->xfer_count;
          }
          
          /* Process Control Data OUT Packet*/
           HAL_PCD_DataOutStageCallback(hpcd, 0U);
          
          PCD_SET_EP_RX_CNT(hpcd->Instance, PCD_ENDP0, ep->maxpacket);
          PCD_SET_EP_RX_STATUS(hpcd->Instance, PCD_ENDP0, USB_EP_RX_VALID);
        }
      }
    }
    else
    {
      /* Decode and service non control endpoints interrupt  */
	  
      /* process related endpoint register */
      wEPVal = PCD_GET_ENDPOINT(hpcd->Instance, epindex);
      if ((wEPVal & USB_EP_CTR_RX) != 0U)
      {  
        /* clear int flag */
        PCD_CLEAR_RX_EP_CTR(hpcd->Instance, epindex);
        ep = &hpcd->OUT_ep[epindex];
        
        /* OUT double Buffering*/
        if (ep->doublebuffer == 0U)
        {
          count = PCD_GET_EP_RX_CNT(hpcd->Instance, ep->num);
          if (count != 0U)
          {
            USB_ReadPMA(hpcd->Instance, ep->xfer_buff, ep->pmaadress, count);
          }
        }
        else
        {
          if (PCD_GET_ENDPOINT(hpcd->Instance, ep->num) & USB_EP_DTOG_RX)
          {
            /*read from endpoint BUF0Addr buffer*/
            count = PCD_GET_EP_DBUF0_CNT(hpcd->Instance, ep->num);
            if (count != 0U)
            {
              USB_ReadPMA(hpcd->Instance, ep->xfer_buff, ep->pmaaddr0, count);
            }
          }
          else
          {
            /*read from endpoint BUF1Addr buffer*/
            count = PCD_GET_EP_DBUF1_CNT(hpcd->Instance, ep->num);
            if (count != 0U)
            {
              USB_ReadPMA(hpcd->Instance, ep->xfer_buff, ep->pmaaddr1, count);
            }
          }
          PCD_FreeUserBuffer(hpcd->Instance, ep->num, PCD_EP_DBUF_OUT);  
        }
        /*multi-packet on the NON control OUT endpoint*/
        ep->xfer_count+=count;
        ep->xfer_buff+=count;
       
        if ((ep->xfer_len == 0U) || (count < ep->maxpacket))
        {
          /* RX COMPLETE */
          HAL_PCD_DataOutStageCallback(hpcd, ep->num);
        }
        else
        {
          HAL_PCD_EP_Receive(hpcd, ep->num, ep->xfer_buff, ep->xfer_len);
        }
        
      } /* if((wEPVal & EP_CTR_RX) */
      
      if ((wEPVal & USB_EP_CTR_TX) != 0U)
      {
        ep = &hpcd->IN_ep[epindex];
        
        /* clear int flag */
        PCD_CLEAR_TX_EP_CTR(hpcd->Instance, epindex);
        
        /* IN double Buffering*/
        if (ep->doublebuffer == 0U)
        {
          ep->xfer_count = PCD_GET_EP_TX_CNT(hpcd->Instance, ep->num);
          if (ep->xfer_count != 0U)
          {
            USB_WritePMA(hpcd->Instance, ep->xfer_buff, ep->pmaadress, ep->xfer_count);
          }
        }
        else
        {
          if (PCD_GET_ENDPOINT(hpcd->Instance, ep->num) & USB_EP_DTOG_TX)
          {
            /*read from endpoint BUF0Addr buffer*/
            ep->xfer_count = PCD_GET_EP_DBUF0_CNT(hpcd->Instance, ep->num);
            if (ep->xfer_count != 0U)
            {
              USB_WritePMA(hpcd->Instance, ep->xfer_buff, ep->pmaaddr0, ep->xfer_count);
            }
          }
          else
          {
            /*read from endpoint BUF1Addr buffer*/
            ep->xfer_count = PCD_GET_EP_DBUF1_CNT(hpcd->Instance, ep->num);
            if (ep->xfer_count != 0U)
            {
              USB_WritePMA(hpcd->Instance, ep->xfer_buff, ep->pmaaddr1, ep->xfer_count);
            }
          }
          PCD_FreeUserBuffer(hpcd->Instance, ep->num, PCD_EP_DBUF_IN);  
        }
        /*multi-packet on the NON control IN endpoint*/
        ep->xfer_count = PCD_GET_EP_TX_CNT(hpcd->Instance, ep->num);
        ep->xfer_buff+=ep->xfer_count;
       
        /* Zero Length Packet? */
        if (ep->xfer_len == 0U)
        {
          /* TX COMPLETE */
          HAL_PCD_DataInStageCallback(hpcd, ep->num);
        }
        else
        {
          HAL_PCD_EP_Transmit(hpcd, ep->num, ep->xfer_buff, ep->xfer_len);
        }
      } 
    }
  }
  return HAL_OK;
}
#endif /* USB */

/**
  * @}
  */

/**
  * @}
  */
  
#endif /* STM32F102x6 || STM32F102xB || */
       /* STM32F103x6 || STM32F103xB || */
       /* STM32F103xE || STM32F103xG || */
       /* STM32F105xC || STM32F107xC    */

#endif /* HAL_PCD_MODULE_ENABLED */


/**
  * @}
  */

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