C++ (Cpp) OTGD_FS_WritePacket Examples

Example #1

File: otgd_fs_int.c Project: Swapnilkumar/BE2012project

/*******************************************************************************
* Function Name  : PCD_WriteEmptyTxFifo
* Description    : Checks Fifo for the next packet to be loaded.
* Input          : None
* Output         : None
* Return         : Status
*******************************************************************************/
static uint32_t PCD_WriteEmptyTxFifo(uint32_t epnum)
{
  USB_OTG_DTXFSTS_TypeDef txstatus;
  USB_OTG_EP *ep;
  uint32_t len = 0;
  uint32_t dwords = 0;
  uint32_t fifoemptymsk = 0;
  
  txstatus.d32 = 0;
  
  ep = PCD_GetInEP(epnum); 
  
  len = ep->xfer_len - ep->xfer_count;

  if (len > ep->maxpacket)
  {
    len = ep->maxpacket;
  }
  
  dwords = (len + 3) / 4;
  txstatus.d32 = USB_OTG_READ_REG32( &USB_OTG_FS_regs.DINEPS[epnum]->DTXFSTSx);

  
  while  ((txstatus.b.txfspcavail > dwords) &&
          (ep->xfer_count < ep->xfer_len) &&
          (ep->xfer_len) != 0)
  {
    len = ep->xfer_len - ep->xfer_count;

    if (len > ep->maxpacket)
    {
      len = ep->maxpacket;
    }
    dwords = (len + 3) / 4;

    OTGD_FS_WritePacket(ep->xfer_buff, epnum, len);    
    
    ep->xfer_count += len;
    ep->xfer_buff += len; 

    txstatus.d32 = USB_OTG_READ_REG32(&USB_OTG_FS_regs.DINEPS[epnum]->DTXFSTSx); 
    
    /* Mask the TxFIFOEmpty interrupt to prevent re-entring this routine */
    if (ep->xfer_len == ep->xfer_count)
    {
      fifoemptymsk = 0x1 << ep->num;
      USB_OTG_MODIFY_REG32(&USB_OTG_FS_regs.DEV->DIEPEMPMSK, fifoemptymsk, 0);    
    }
  }
  
  return 1;
}

Example #2

File: otgd_fs_cal.c Project: ChingHengWang/stm32_ws

/*******************************************************************************
* Function Name  : OTGD_FS_EPStartXfer
* Description    : Handle the setup for data xfer for an EP and starts the xfer
* Input          : None
* Output         : None
* Return         : status
*******************************************************************************/
USB_OTG_Status OTGD_FS_EPStartXfer(USB_OTG_EP *ep)
{
  USB_OTG_DSTS_TypeDef dsts;  
  USB_OTG_Status status = USB_OTG_OK;
  __IO USB_OTG_DEPCTLx_TypeDef depctl;
  OTG_FS_DEPTSIZx_TypeDef deptsiz;

  depctl.d32 = 0;
  deptsiz.d32 = 0;
  
  /* IN endpoint */
  if (ep->is_in == 1)
  {

    depctl.d32  = USB_OTG_READ_REG32(&(USB_OTG_FS_regs.DINEPS[ep->num]->DIEPCTLx));
    deptsiz.d32 = USB_OTG_READ_REG32(&(USB_OTG_FS_regs.DINEPS[ep->num]->DIEPTSIZx));

    /* Zero Length Packet? */
    if (ep->xfer_len == 0)
    {
      deptsiz.b.xfersize = 0;
      deptsiz.b.pktcnt = 1;

    }
    else
    {
      /* Program the transfer size and packet count
       * as follows: xfersize = N * maxpacket +
       * short_packet pktcnt = N + (short_packet
       * exist ? 1 : 0)
       */
      deptsiz.b.xfersize = ep->xfer_len;
      deptsiz.b.pktcnt = (ep->xfer_len - 1 + ep->maxpacket) / ep->maxpacket;
      
      if (ep->type == EP_TYPE_ISOC)
      {
        deptsiz.b.mcount = 1;
      }      
    }
    USB_OTG_WRITE_REG32(&USB_OTG_FS_regs.DINEPS[ep->num]->DIEPTSIZx, deptsiz.d32);

    if (ep->type != EP_TYPE_ISOC)
    {
      /* Enable the Tx FIFO Empty Interrupt for this EP */
      uint32_t fifoemptymsk = 0;
      fifoemptymsk = 1 << ep->num;
      USB_OTG_MODIFY_REG32(&USB_OTG_FS_regs.DEV->DIEPEMPMSK, 0, fifoemptymsk);
    }
   
    /* EP enable, IN data in FIFO */
    depctl.b.cnak = 1;
    depctl.b.epena = 1;
    
    if (ep->type == EP_TYPE_ISOC)
    {
      dsts.d32 = USB_OTG_READ_REG32(&USB_OTG_FS_regs.DEV->DSTS);
      
      if (((dsts.b.soffn)&0x1)==0)
      {
        depctl.b.setoddfrm=1;
      }
      else
      {
        depctl.b.setd0pid=1;
      }
    }  
    
    USB_OTG_WRITE_REG32(&USB_OTG_FS_regs.DINEPS[ep->num]->DIEPCTLx, depctl.d32); 
    
    if (ep->type == EP_TYPE_ISOC)
    {
      /*write buffer in TXFIFO*/
      /* user should ensure that ep->xfer_len <= ep->maxpacket */
      OTGD_FS_WritePacket(ep->xfer_buff, ep->num, ep->xfer_len);    
    }
  }
  else
  {
    /* OUT endpoint */
    depctl.d32  = USB_OTG_READ_REG32(&(USB_OTG_FS_regs.DOUTEPS[ep->num]->DOEPCTLx));
    deptsiz.d32 = USB_OTG_READ_REG32(&(USB_OTG_FS_regs.DOUTEPS[ep->num]->DOEPTSIZx));

    /* Program the transfer size and packet count as follows:
     * pktcnt = N
     * xfersize = N * maxpacket
     */
    if (ep->xfer_len == 0)
    {
      deptsiz.b.xfersize = ep->maxpacket;
      deptsiz.b.pktcnt = 1;
    }
    else
    {
      deptsiz.b.pktcnt = (ep->xfer_len + (ep->maxpacket - 1)) / ep->maxpacket;
      deptsiz.b.xfersize = deptsiz.b.pktcnt * ep->maxpacket;
    }
    USB_OTG_WRITE_REG32(&USB_OTG_FS_regs.DOUTEPS[ep->num]->DOEPTSIZx, deptsiz.d32);

    if (ep->type == EP_TYPE_ISOC)
    {

      if (ep->even_odd_frame)
      {
        depctl.b.setoddfrm = 1;
      }
      else
      {
        depctl.b.setd0pid = 1;
      }
    }

    /* EP enable */
    depctl.b.cnak = 1;
    depctl.b.epena = 1;

    USB_OTG_WRITE_REG32(&USB_OTG_FS_regs.DOUTEPS[ep->num]->DOEPCTLx, depctl.d32);

  }
  return status;
}