lpc214x_usbdev.c

    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_NULLREQUEST), 0);
      return OK;
    }

  /* Ignore any attempt to send a zero length packet */

  if (privreq->req.len == 0)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_NULLPACKET), 0);
      lpc214x_reqcomplete(privep, OK);
      return OK;
    }

  /* Otherwise send the data in the packet (in the DMA on case, we
   * may be resuming transfer already in progress.
   */

  for (;;)
    {
      /* Get the number of bytes left to be sent in the packet */

      bytesleft = privreq->req.len - privreq->req.xfrd;

      /* Send the next packet if (1) there are more bytes to be sent, or
       * (2) the last packet sent was exactly maxpacketsize (bytesleft == 0)
       */

      usbtrace(TRACE_WRITE(privep->epphy), privreq->req.xfrd);
      if (bytesleft >= 0)
        {
          /* Try to send maxpacketsize -- unless we don't have that many
           * bytes to send.
           */

          nbytes = privep->ep.maxpacket;
          if (nbytes > bytesleft)
            {
              nbytes = bytesleft;
            }

          /* Send the largest number of bytes that we can in this packet */

          buf = privreq->req.buf + privreq->req.xfrd;
          lpc214x_epwrite(privep->epphy, buf, nbytes);

          /* Update for the next time through the loop */

          privreq->req.xfrd += nbytes;
        }

      /* If all of the bytes were sent (including any final null packet)
       * then we are finished with the transfer
       */

      if (bytesleft <= 0)
        {
          usbtrace(TRACE_COMPLETE(privep->epphy), privreq->req.xfrd);
          lpc214x_reqcomplete(privep, OK);
          return OK;
        }
    }

  return OK; /* Won't get here */
}

/*******************************************************************************
 * Name: lpc214x_rdrequest
 *
 * Description:
 *   Receive to the next queued read request
 *
 *******************************************************************************/

static int lpc214x_rdrequest(struct lpc214x_ep_s *privep)
{
  struct lpc214x_req_s *privreq;
  ubyte *buf;
  int nbytesread;

  /* Check the request from the head of the endpoint request queue */

  privreq = lpc214x_rqpeek(privep);
  if (!privreq)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_NULLREQUEST), 0);
      return OK;
    }

  /* Ignore any attempt to receive a zero length packet */

  if (privreq->req.len == 0)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_NULLPACKET), 0);
      lpc214x_reqcomplete(privep, OK);
      return OK;
    }

  usbtrace(TRACE_READ(privep->epphy), privreq->req.xfrd);
  for (;;)
    {
      /* Receive the next packet if (1) there are more bytes to be receive, or
       * (2) the last packet was exactly maxpacketsize.
       */

      buf        = privreq->req.buf + privreq->req.xfrd;
      nbytesread = lpc214x_epread(privep->epphy, buf, privep->ep.maxpacket);
      if (nbytesread < 0)
        {
          usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_EPREAD), nbytesread);
          return ERROR;
        }

      /* If the receive buffer is full or if the last packet was not full
       * then we are finished with the transfer.
       */

      privreq->req.xfrd += nbytesread;
      if (privreq->req.len < privreq->req.xfrd || nbytesread < privep->ep.maxpacket)
        {
          usbtrace(TRACE_COMPLETE(privep->epphy), privreq->req.xfrd);
          lpc214x_reqcomplete(privep, OK);
          return OK;
        }
    }

  return OK; /* Won't get here */
}

/*******************************************************************************
 * Name: lpc214x_cancelrequests
 *
 * Description:
 *   Cancel all pending requests for an endpoint
 *
 *******************************************************************************/

static void lpc214x_cancelrequests(struct lpc214x_ep_s *privep)
{
  while (!lpc214x_rqempty(privep))
    {
      usbtrace(TRACE_COMPLETE(privep->epphy),
               (lpc214x_rqpeek(privep))->req.xfrd);
      lpc214x_reqcomplete(privep, -ESHUTDOWN);
    }
}

/*******************************************************************************
 * Name: lpc214x_eprealize
 *
 * Description:
 *   Enable or disable an endpoint
 *
 *******************************************************************************/

static void lpc214x_eprealize(struct lpc214x_ep_s *privep, boolean prio, uint32 packetsize)
{
  struct lpc214x_usbdev_s *priv = privep->dev;
  uint32 mask;
  uint32 reg;

  /* Initialize endpoint software priority */

  mask = 1 << privep->epphy;
  if (prio)
    {
      priv->softprio = priv->softprio | mask;
    }
  else
    {
      priv->softprio = priv->softprio & ~mask;
    }

  /* Clear realize interrupt bit */

  lpc214x_putreg(USBDEV_DEVINT_EPRLZED, LPC214X_USBDEV_DEVINTCLR);

  /* Realize the endpoint */

  reg  = lpc214x_getreg(LPC214X_USBDEV_REEP);
  reg |= (1 << privep->epphy);
  lpc214x_putreg(reg, LPC214X_USBDEV_REEP);

  /* Set endpoint maximum packet size */

  lpc214x_putreg(privep->epphy, LPC214X_USBDEV_EPIND);
  lpc214x_putreg(packetsize, LPC214X_USBDEV_MAXPSIZE);

  /* Wait for Realize complete */

  while ((lpc214x_getreg(LPC214X_USBDEV_DEVINTST) & USBDEV_DEVINT_EPRLZED) == 0);

  /* Clear realize interrupt bit */

  lpc214x_putreg(USBDEV_DEVINT_EPRLZED,LPC214X_USBDEV_DEVINTCLR);
}

/*******************************************************************************
 * Name: lpc214x_epclrinterrupt
 *
 * Description:
 *   Clear the EP interrupt flag and return the current EP status
 *
 *******************************************************************************/

static ubyte lpc214x_epclrinterrupt(ubyte epphy)
{
  /* Clear the endpoint interrupt */

  lpc214x_putreg(1 << epphy, LPC214X_USBDEV_EPINTCLR);

  /* Wait for data in the command data register */

  while ((lpc214x_getreg(LPC214X_USBDEV_DEVINTST) & USBDEV_DEVINT_CDFULL) == 0);

  /* Return the value of the command data register */

  return lpc214x_getreg(LPC214X_USBDEV_CMDDATA);
}

/*******************************************************************************
 * Name: lpc214x_ep0configure
 *
 * Description:
 *   Configure endpoint 0
 *
 *******************************************************************************/

static inline void lpc214x_ep0configure(struct lpc214x_usbdev_s *priv)
{
  uint32 inten;

  /* EndPoint 0 initialization */

  lpc214x_eprealize(&priv->eplist[LPC214X_CTRLEP_OUT], 0, CONFIG_USBDEV_EP0_MAXSIZE);
  lpc214x_eprealize(&priv->eplist[LPC214X_CTRLEP_IN], 1, CONFIG_USBDEV_EP0_MAXSIZE);

  /* Enable EP0 interrupts (not DMA) */

  inten = lpc214x_getreg(LPC214X_USBDEV_EPINTEN);
  inten |= 3; /* EP0 Rx and Tx */
  lpc214x_putreg(inten, LPC214X_USBDEV_EPINTEN);
}

/*******************************************************************************
 * Name: lpc214x_dmareset
 *
 * Description: Reset USB DMA
 *
 *******************************************************************************/

#ifdef CONFIG_LPC214X_USBDEV_DMA
static inline void lpc214x_dmareset(uint32 enable)
{
  int i;

  /* Disable All DMA interrupts */

  lpc214x_putreg(0, LPC214X_USBDEV_DMAINTEN);

  /* DMA Disable */

  lpc214x_putreg(0xffffffff, LPC214X_USBDEV_EPDMADIS);

  /* DMA Request clear */

  putreq32(0xffffffff, LPC214X_USBDEV_DMARCLR);

  /* End of Transfer Interrupt Clear */

  putreq32(0xffffffff, LPC214X_USBDEV_EOTINTCLR);

  /* New DD Request Interrupt Clear */

  putreq32(0xffffffff, LPC214X_USBDEV_NDDRINTCLR);

  /* System Error Interrupt Clear */

  putreq32(0xffffffff, LPC214X_USBDEV_SYSERRINTCLR);

  /* Nullify all pointers in the UDCA */

  for (i = 0; i < LPC214X_NPHYSENDPOINTS; ++i)
    {
      USB_UDCA[i] = NULL;
    }

  /* Set USB UDCA Head register */

  lpc214x_putreg((uint32)USB_UDCA, LPC214X_USBDEV_UDCAH);

  /* Invalidate all DMA descriptors */

  for (i = 0; i < CONFIG_LPC214X_USBDEV_NDMADESCRIPTORS; ++i)
    {
      memset(&USB_DDESC[i], 0, USB_DDESCSIZE);
    }

  /* Enable DMA interrupts */

  lpc214x_putreg(enable, LPC214X_USBDEV_DMAINTEN);
}
#endif

/*******************************************************************************
 * Name: lpc214x_usbreset
 *
 * Description:
 *   Reset Usb engine
 *
 *******************************************************************************/

static void lpc214x_usbreset(struct lpc214x_usbdev_s *priv)
{
  /* Disable all endpoint interrupts */

  lpc214x_putreg(0, LPC214X_USBDEV_EPINTEN);

  /* Frame is Hp interrupt */

  lpc214x_putreg(1, LPC214X_USBDEV_DEVINTPRI);

  /* Clear all pending interrupts */

  lpc214x_putreg(0xffffffff, LPC214X_USBDEV_EPINTCLR);
  lpc214x_putreg(0xffffffff, LPC214X_USBDEV_DEVINTCLR);

  /* Periperhal address is needed */

  priv->paddrset = 0;

  /* Endpoints not yet configured */

  lpc214x_usbcmd(CMD_USB_DEV_CONFIG, 0);

  /* EndPoint 0 initialization */

  lpc214x_ep0configure(priv);

#ifdef CONFIG_LPC214X_USBDEV_DMA
  /* Enable End_of_Transfer_Interrupt and System_Error_Interrupt USB DMA
   * interrupts
   */

  lpc214x_dmareset(CONFIG_LPC214X_USBDEV_DMAINTMASK);

#endif

  /* Enable Device interrupts */

  lpc214x_putreg(USB_SLOW_INT|USB_DEVSTATUS_INT|USB_FAST_INT|USB_FRAME_INT|USB_ERROR_INT,
                 LPC214X_USBDEV_DEVINTEN);
}

/*******************************************************************************
 * Name: lpc214x_dispatchrequest
 *
 * Description:
 *   Provide unhandled setup actions to the class driver. This is logically part
 *   of the USB interrupt handler.
 *
 *******************************************************************************/

static void lpc214x_dispatchrequest(struct lpc214x_usbdev_s *priv,
                                    const struct usb_ctrlreq_s *ctrl)
{
  int ret;

  usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_DISPATCH), 0);
  if (priv && priv->driver)
    {
      ret = CLASS_SETUP(priv->driver, &priv->usbdev, ctrl);
      if (ret < 0)
        {
          /* Stall on failure */

          priv->stalled = 1;
        }
      else
        {
          lpc214x_epwrite(LPC214X_EP0_IN, NULL, 0);
          priv->ep0state = LPC214X_EP0SHORTWRITE;
        }
    }
}

/*******************************************************************************
 * Name: lpc214x_ep0setup
 *
 * Description:
 *   USB Ctrl EP Setup Event. This is logically part of the USB interrupt
 *   handler.
 *
 *******************************************************************************/

static inline void lpc214x_ep0setup(struct lpc214x_usbdev_s *priv)
{
  struct lpc214x_ep_s *ep0 = &priv->eplist[LPC214X_EP0_OUT];
  struct lpc214x_req_s *privreq = lpc214x_rqpeek(ep0);
  struct usb_ctrlreq_s ctrl;
  uint16 index;
  ubyte  epphy;
  ubyte  response[2];
  int    ret;

  /* Starting a control request? */

  if (priv->usbdev.speed == USB_SPEED_UNKNOWN)
    {
      priv->usbdev.speed = USB_SPEED_FULL;
      lpc214x_usbcmd(CMD_USB_DEV_CONFIG, 1);
    }

  /* Terminate any pending requests */

  while (!lpc214x_rqempty(ep0))
    {
      sint16 result = OK;
      if (privreq->req.xfrd != privreq->req.len)
        {
          result = -EPROTO;
        }

      usbtrace(TRACE_COMPLETE(ep0->epphy), privreq->req.xfrd);
      lpc214x_reqcomplete(ep0, result);
    }

  /* Assume NOT stalled */

  ep0->stalled  = 0;
  priv->stalled = 0;

  /* Read EP0 data */

  ret = lpc214x_epread(LPC214X_EP0_OUT, (ubyte*)&ctrl, USB_SIZEOF_CTRLREQ);
  if (ret <= 0)
    {
      return;
    }

  uvdbg("type=%02x req=%02x value=%04x index=%04x len=%04x\n",
        ctrl.type, ctrl.req,
        GETUINT16(ctrl.value), GETUINT16(ctrl.index), GETUINT16(ctrl.len));

  /* Dispatch any non-standard requests */

  if ((ctrl.type & USB_REQ_TYPE_MASK) != USB_REQ_TYPE_STANDARD)
    {
      lpc214x_dispatchrequest(priv, &ctrl);
      return;
    }

  /* Handle standard request.  Pick off the things of interest to the
   * USB device controller driver; pass what is left to the class driver
   */

  switch (ctrl.req)
    {
    case USB_REQ_GETSTATUS:
      {
        /* type:  device-to-host; recipient = device, interface, endpoint
         * value: 0
         * index: zero interface endpoint
         * len:   2; data = status
         */

        usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_GETSTATUS), 0);
        if (!priv->paddrset || GETUINT16(ctrl.len) != 2 ||
            (ctrl.type & USB_REQ_DIR_IN) == 0 || GETUINT16(ctrl.value) != 0)
          {
            priv->stalled = 1;
          }
        else
          {
            switch (ctrl.type & USB_REQ_RECIPIENT_MASK)
              {
              case USB_REQ_RECIPIENT_ENDPOINT:
                {
                  usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_EPGETSTATUS), 0);
                  epphy = USB_EPNO(GETUINT16(ctrl.index)) << 1;
                  if (epphy < LPC214X_NPHYSENDPOINTS)
                    {
                       if ((lpc214x_usbcmd(CMD_USB_EP_SELECT|epphy, 0) & CMD_USB_EPSELECT_ST) != 0)
                         {
                           response[0] = 1; /* Stalled */
                         }
                       else
                         {
                           response[0] = 0; /* Not stalled */
                         }
                      response[1] = 0;
                      lpc214x_epwrite(LPC214X_EP0_IN, response, 2);
                      priv->ep0state = LPC214X_EP0SHORTWRITE;
                    }
                  else
                    {
                      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_BADEPGETSTATUS), 0);
                      priv->stalled = 1;
                    }
                }
                break;

              case USB_REQ_RECIPIENT_DEVICE:
                {
                  index = GETUINT16(ctrl.index);
                  if (index == 0)
                    {
                      usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_DEVGETSTATUS), 0);

                      /* Features:  Remote Wakeup=YES; selfpowered=? */

                      response[0] = (priv->selfpowered << USB_FEATURE_SELFPOWERED) |
                                    (1 << USB_FEATURE_REMOTEWAKEUP);
                      response[1] = 0;
                      lpc214x_epwrite(LPC214X_EP0_IN, response, 2);
                      priv->ep0state = LPC214X_EP0SHORTWRITE;
                    }
                  else
                    {
                      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_BADDEVGETSTATUS), 0);
                      priv->stalled = 1;
                    }
                }
                break;

              case USB_REQ_RECIPIENT_INTERFACE:
                {
                  usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_IFGETSTATUS), 0);
                  response[0] = 0;
                  response[1] = 0;
                  lpc214x_epwrite(LPC214X_EP0_IN, response, 2);
                  priv->ep0state = LPC214X_EP0SHORTWRITE;
                }
                break;

              default:
                {
                  usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_BADGETSTATUS), 0);
                  priv->stalled = 1;
                }
                break;
              }
          }
      }
      break;

    case USB_REQ_CLEARFEATURE:
      {
        /* type:  host-to-device; recipient = device, interface or endpoint
         * value: feature selector
         * index: zero interface endpoint;
         * len:   zero, data = none
         */

        usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_CLEARFEATURE), 0);
        if ((ctrl.type & USB_REQ_RECIPIENT_MASK) != USB_REQ_RECIPIENT_ENDPOINT)
          {
            lpc214x_dispatchrequest(priv, &ctrl);
          }
        else if (priv->paddrset && GETUINT16(ctrl.value) == USB_FEATURE_ENDPOINTHALT &&
                 GETUINT16(ctrl.index) < LPC214X_NLOGENDPOINTS && GETUINT16(ctrl.len) == 0)
          {
            ubyte epphys = LPC214X_EP_LOG2PHY(GETUINT16(ctrl.index));
            priv->eplist[epphys].halted = 0;
            lpc214x_epwrite(LPC214X_EP0_IN, NULL, 0);
            priv->ep0state = LPC214X_EP0STATUSIN;
          }
        else
          {
            usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_BADCLEARFEATURE), 0);
            priv->stalled = 1;
          }
      }
      break;

    case USB_REQ_SETFEATURE:
      {
        /* type:  host-to-device; recipient = device, interface, endpoint
         * value: feature selector
         * index: zero interface endpoint;
         * len:   0; data = none
         */

        usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_SETFEATURE), 0);
        if (((ctrl.type & USB_REQ_RECIPIENT_MASK) == USB_REQ_RECIPIENT_DEVICE) &&
            GETUINT16(ctrl.value) == USB_FEATURE_TESTMODE)
          {
            uvdbg("test mode: %d\n", GETUINT16(ctrl.index));
          }
        else if ((ctrl.type & USB_REQ_RECIPIENT_MASK) != USB_REQ_RECIPIENT_ENDPOINT)
          {
           lpc214x_dispatchrequest(priv, &ctrl);
          }
        else if (priv->paddrset && GETUINT16(ctrl.value) == USB_FEATURE_ENDPOINTHALT &&
                 GETUINT16(ctrl.index) < LPC214X_NLOGENDPOINTS && GETUINT16(ctrl.len) == 0)
          {
            ubyte epphys = LPC214X_EP_LOG2PHY(GETUINT16(ctrl.index));
            priv->eplist[epphys].halted = 1;
            lpc214x_epwrite(LPC214X_EP0_IN, NULL, 0);
            priv->ep0state = LPC214X_EP0STATUSIN;
          }
        else
          {
            usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_BADSETFEATURE), 0);
            priv->stalled = 1;
          }
      }
      break;

    case USB_REQ_SETADDRESS:
      {
        /* type:  host-to-device; recipient = device
         * value: device address
         * index: 0
         * len:   0; data = none
         */

        usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_SETADDRESS), 0);
        if ((ctrl.type & USB_REQ_RECIPIENT_MASK) == USB_REQ_RECIPIENT_DEVICE &&
            GETUINT16(ctrl.index)  == 0 && GETUINT16(ctrl.len) == 0 &&
            GETUINT16(ctrl.value) < 128)
          {
            lpc214x_epwrite(LPC214X_EP0_IN, NULL, 0);
            priv->eplist[LPC214X_EP0_OUT].eplog = ctrl.value[0];
            priv->eplist[LPC214X_EP0_IN].eplog  = ctrl.value[0];
            priv->ep0state = LPC214X_EP0SETADDRESS;
          }
        else
          {
            usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_BADSETADDRESS), 0);
            priv->stalled = 1;
          }
      }
      break;

    case USB_REQ_GETDESCRIPTOR:
      /* type:  device-to-host; recipient = device
       * value: descriptor type and index
       * index: 0 or language ID;
       * len:   descriptor len; data = descriptor
       */
    case USB_REQ_SETDESCRIPTOR:
      /* type:  host-to-device; recipient = device
       * value: descriptor type and index
       * index: 0 or language ID;
       * len:   descriptor len; data = descriptor
       */
      {
        usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_GETSETDESC), 0);
        if ((ctrl.type & USB_REQ_RECIPIENT_MASK) == USB_REQ_RECIPIENT_DEVICE)
          {
            lpc214x_dispatchrequest(priv, &ctrl);
          }
        else
          {
            usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_BADGETSETDESC), 0);
            priv->stalled = 1;
          }
      }
      break;

    case USB_REQ_GETCONFIGURATION:
      /* type:  device-to-host; recipient = device
       * value: 0;
       * index: 0;
       * len:   1; data = configuration value
       */
      {
        usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_GETCONFIG), 0);
        if (priv->paddrset && (ctrl.type & USB_REQ_RECIPIENT_MASK) == USB_REQ_RECIPIENT_DEVICE &&
            GETUINT16(ctrl.value) == 0 && GETUINT16(ctrl.index) == 0 &&
            GETUINT16(ctrl.len) == 1)
          {
            lpc214x_dispatchrequest(priv, &ctrl);
          }
        else
          {
            usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_BADGETCONFIG), 0);
            priv->stalled = 1;
          }
      }
      break;

    case USB_REQ_SETCONFIGURATION:
      /* type:  host-to-device; recipient = device
       * value: configuration value
       * index: 0;
       * len:   0; data = none
       */
      {
        usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_SETCONFIG), 0);
        if ((ctrl.type & USB_REQ_RECIPIENT_MASK) == USB_REQ_RECIPIENT_DEVICE &&
            GETUINT16(ctrl.index) == 0 && GETUINT16(ctrl.len) == 0)
          {
            lpc214x_dispatchrequest(priv, &ctrl);
          }
        else
          {
            usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_BADSETCONFIG), 0);
            priv->stalled = 1;
          }
      }
      break;

    case USB_REQ_GETINTERFACE:
      /* type:  device-to-host; recipient = interface
       * value: 0
       * index: interface;
       * len:   1; data = alt interface
       */
    case USB_REQ_SETINTERFACE:
      /* type:  host-to-device; recipient = interface
       * value: alternate setting
       * index: interface;
       * len:   0; data = none
       */
      {
        usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_GETSETIF), 0);
        lpc214x_dispatchrequest(priv, &ctrl);
      }
      break;

    case USB_REQ_SYNCHFRAME:
      /* type:  device-to-host; recipient = endpoint
       * value: 0
       * index: endpoint;
       * len:   2; data = frame number
       */
      {
        usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_SYNCHFRAME), 0);
      }
      break;

    default:
      {
        usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_INVALIDCTRLREQ), 0);
        priv->stalled = 1;
      }
      break;
    }

  if (priv->stalled)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_STALLED), priv->ep0state);
      lpc214x_epstall(&ep0->ep, FALSE);
      lpc214x_epstall(&ep0->ep, FALSE);
    }
}

/*******************************************************************************
 * Name: lpc214x_ep0dataoutinterrupt
 *
 * Description:
 *   USB Ctrl EP Data OUT Event. This is logically part of the USB interrupt
 *   handler.
 *
 *******************************************************************************/

static inline void lpc214x_ep0dataoutinterrupt(struct lpc214x_usbdev_s *priv)
{
  struct lpc214x_ep_s *ep0;
  uint32 pktlen;

  /* Copy new setup packet int setup buffer */

  switch (priv->ep0state)
    {
    case LPC214X_EP0SHORTWRITE:
      {
        priv->ep0state = LPC214X_EP0STATUSOUT;
        pktlen = lpc214x_epread(LPC214X_EP0_OUT, NULL, CONFIG_USBDEV_EP0_MAXSIZE);
        if (LPC214X_READOVERRUN(pktlen))
          {
            lpc214x_ep0setup(priv);
          }
      }
      break;

    case LPC214X_EP0SHORTWRSENT:
      {
        priv->ep0state = LPC214X_EP0IDLE;
        pktlen = lpc214x_epread(LPC214X_EP0_OUT, NULL, CONFIG_USBDEV_EP0_MAXSIZE);
        if (LPC214X_READOVERRUN(pktlen))
          {
            lpc214x_ep0setup(priv);
          }
      }
      break;

    case LPC214X_EP0IDLE:
      {
        ep0 = &priv->eplist[LPC214X_EP0_OUT];
        if (!lpc214x_rqempty(ep0))
          {
            lpc214x_wrrequest(ep0);
          }
      }
      break;

    default:
      priv->stalled = 1;
      break;
    }

  if (priv->stalled)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_STALLED), priv->ep0state);
      ep0 = &priv->eplist[LPC214X_EP0_OUT];
      lpc214x_epstall(&ep0->ep, FALSE);
      lpc214x_epstall(&ep0->ep, FALSE);
    }
  return;
}

/*******************************************************************************
 * Name: lpc214x_ep0dataininterrupt
 *
 * Description:
 *   USB Ctrl EP Data IN Event. This is logically part of the USB interrupt
 *   handler.
 *
 *******************************************************************************/

static inline void lpc214x_ep0dataininterrupt(struct lpc214x_usbdev_s *priv)
{
  struct lpc214x_ep_s *ep0;

  switch (priv->ep0state)
    {
    case LPC214X_EP0STATUSOUT:
    case LPC214X_EP0STATUSIN:
      priv->ep0state = LPC214X_EP0IDLE;
      break;

    case LPC214X_EP0SHORTWRITE:
      priv->ep0state = LPC214X_EP0SHORTWRSENT;
      break;

    case LPC214X_EP0SETADDRESS:
      {
        usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_SETADDRESS), 0);

        /* Set EP0 logical address */

        ubyte eplog = priv->eplist[LPC214X_EP0_OUT].eplog;
        lpc214x_usbcmd(CMD_USB_DEV_SETADDRESS, CMD_USB_SETADDRESS_DEVEN | eplog);
        lpc214x_usbcmd(CMD_USB_DEV_SETADDRESS, CMD_USB_SETADDRESS_DEVEN | eplog);

        /* Not yet fully configured */

        lpc214x_usbcmd(CMD_USB_DEV_CONFIG, 0);
        if (eplog)
          {
            priv->paddrset = 1;
            priv->ep0state = LPC214X_EP0IDLE;
          }
      }
      break;

    default:
      priv->stalled = 1;
      break;
    }

  if (priv->stalled)
    {
      usbtrace(TRACE_DEVERROR(LPC214X_TRACEERR_STALLED), priv->ep0state);
      ep0 = &priv->eplist[LPC214X_EP0_IN];
      lpc214x_epstall(&ep0->ep, FALSE);
      lpc214x_epstall(&ep0->ep, FALSE);
    }
}

/*******************************************************************************
 * Name: lpc214x_usbinterrupt
 *
 * Description:
 *   USB interrupt handler
 *
 *******************************************************************************/

static int lpc214x_usbinterrupt(int irq, FAR void *context)
{
  struct lpc214x_usbdev_s *priv = &g_usbdev;
  struct lpc214x_ep_s *privep ;

  uint32 devintstatus;  /* Sampled state of the device interrupt status register */
  uint32 epintstatus;   /* Sampled state of the endpoint interrupt status register */
#ifdef CONFIG_LPC214X_USBDEV_DMA
  uint32 dmaintstatus;  /* Sampled state of dma interrupt status register */
#endif
  uint32 softprio;      /* Current priority interrupt bitset */
  uint32 pending;       /* Pending subset of priority interrupt bitset */
  ubyte  epphy;         /* Physical endpoint number being processed */
  int    i;

  usbtrace(TRACE_INTENTRY(LPC214X_TRACEINTID_USB), 0);

  /* Read the device interrupt status register */

  devintstatus = lpc214x_getreg(LPC214X_USBDEV_DEVINTST);

#ifdef CONFIG_LPC214X_USBDEV_DMA
  /* Check for low priority and high priority (non-DMA) interrupts */

  if ((lpc214x_getreg(LPC214X_USBDEV_INTST) & (USBDEV_INTST_REQLP|USBDEV_INTST_REQHP)) != 0)
    {
#endif
#ifdef CONFIG_LPC214X_USBDEV_EPFAST_INTERRUPT
      /* Fast EP interrupt */

      if ((devintstatus & USBDEV_DEVINT_EPFAST) != 0)
        {
          /* Clear Fast EP interrupt */

         lpc214x_putreg(USBDEV_DEVINT_EPFAST, LPC214X_USBDEV_DEVINTCLR);
         usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_EPFAST), 0);

         /* Do what? */
        }

#endif

#if CONFIG_DEBUG
      /* USB engine error interrupt */

      if ((devintstatus & USBDEV_DEVINT_EPRINT))
        {
          ubyte errcode;

          /* Clear the error interrupt */

          lpc214x_putreg(USBDEV_DEVINT_EPRINT, LPC214X_USBDEV_DEVINTCLR);

          /* And show what error occurred */

          errcode  = (ubyte)lpc214x_usbcmd(CMD_USB_DEV_READERRORSTATUS, 0) & 0x0f;
          usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_EPRINT), (uint16)errcode);
        }
#endif

#ifdef CONFIG_LPC214X_USBDEV_FRAME_INTERRUPT
      /* Frame interrupt */

      if ((devintstatus & USBDEV_DEVINT_FRAME) != 0)
        {
          /* Clear the frame interrupt */

          lpc214x_putreg(USBDEV_DEVINT_FRAME, LPC214X_USBDEV_DEVINTCLR);
          usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_FRAME), 0);

          /* Then read the start of frame value */

          priv->sof = (uint16)lpc214x_usbcmd(CMD_USB_DEV_READFRAMENO, 0);
        }
#endif

      /* Device Status interrupt */

      if ((devintstatus & USBDEV_DEVINT_DEVSTAT) != 0)
        {
          /* Clear Device status interrupt */

          lpc214x_putreg(USBDEV_DEVINT_DEVSTAT, LPC214X_USBDEV_DEVINTCLR);

          /* Get device status */

          g_usbdev.devstatus = (ubyte)lpc214x_usbcmd(CMD_USB_DEV_GETSTATUS, 0);
          usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_DEVSTAT), (uint16)g_usbdev.devstatus);

          /* Device connection status */

          if (DEVSTATUS_CONNCHG(g_usbdev.devstatus))
            {
              usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_CONNECTCHG), 0);
              if (DEVSTATUS_CONNECT(g_usbdev.devstatus))
                {
                   /* Host is connected */

                   if (!priv->attached)
                     {
                       /* We have a transition from unattached to attached */

                       usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_CONNECTED), 0);
                       priv->usbdev.speed = USB_SPEED_UNKNOWN;
                       lpc214x_usbcmd(CMD_USB_DEV_CONFIG, 0);
                       priv->attached     = 1;
                    }
                 }

               /* Otherwise the host is not attached */

               else if (priv->attached)
                 {
                   usbtrace(TRACE_INTDECODE(LPC214X_TRACEINTID_DISCONNECTED), 0);
                   priv->usbdev.speed = USB_SPEED_UNKNOWN;
                   lpc214x_usbcmd(CMD_USB_DEV_CONFIG, 0);
                   priv->attached = 0;
                   priv->paddrset = 0;
                 }