usb_hcd_int.c

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/* Includes ------------------------------------------------------------------*/
#include "usb_core.h"
#include "usb_defines.h"
#include "usb_hcd_int.h"

#if defined   (__CC_ARM) 
#pragma O0
#elif defined (__GNUC__) 
#pragma GCC optimize ("O0")
#elif defined  (__TASKING__) 
#pragma optimize=0                          

#endif /* __CC_ARM */

static uint32_t USB_OTG_USBH_handle_sof_ISR(USB_OTG_CORE_HANDLE *pdev);
static uint32_t USB_OTG_USBH_handle_port_ISR(USB_OTG_CORE_HANDLE *pdev);
static uint32_t USB_OTG_USBH_handle_hc_ISR (USB_OTG_CORE_HANDLE *pdev);
static uint32_t USB_OTG_USBH_handle_hc_n_In_ISR (USB_OTG_CORE_HANDLE *pdev ,
                                                 uint32_t num);
static uint32_t USB_OTG_USBH_handle_hc_n_Out_ISR (USB_OTG_CORE_HANDLE *pdev , 
                                                  uint32_t num);
static uint32_t USB_OTG_USBH_handle_rx_qlvl_ISR (USB_OTG_CORE_HANDLE *pdev);
static uint32_t USB_OTG_USBH_handle_nptxfempty_ISR (USB_OTG_CORE_HANDLE *pdev);
static uint32_t USB_OTG_USBH_handle_ptxfempty_ISR (USB_OTG_CORE_HANDLE *pdev);
static uint32_t USB_OTG_USBH_handle_Disconnect_ISR (USB_OTG_CORE_HANDLE *pdev);
static uint32_t USB_OTG_USBH_handle_IncompletePeriodicXfer_ISR (USB_OTG_CORE_HANDLE *pdev);

uint32_t USBH_OTG_ISR_Handler (USB_OTG_CORE_HANDLE *pdev)
{
  USB_OTG_GINTSTS_TypeDef  gintsts;
  uint32_t retval = 0;
  
  gintsts.d32 = 0;
  
  /* Check if HOST Mode */
  if (USB_OTG_IsHostMode(pdev))
  {
    gintsts.d32 = USB_OTG_ReadCoreItr(pdev);
    if (!gintsts.d32)
    {
      return 0;
    }
    
    if (gintsts.b.sofintr)
    {
      retval |= USB_OTG_USBH_handle_sof_ISR (pdev);
    }
    
    if (gintsts.b.rxstsqlvl)
    {
      retval |= USB_OTG_USBH_handle_rx_qlvl_ISR (pdev);
    }
    
    if (gintsts.b.nptxfempty)
    {
      retval |= USB_OTG_USBH_handle_nptxfempty_ISR (pdev);
    }
    
    if (gintsts.b.ptxfempty)
    {
      retval |= USB_OTG_USBH_handle_ptxfempty_ISR (pdev);
    }    
    
    if (gintsts.b.hcintr)
    {
      retval |= USB_OTG_USBH_handle_hc_ISR (pdev);
    }
    
    if (gintsts.b.portintr)
    {
      retval |= USB_OTG_USBH_handle_port_ISR (pdev);
    }
    
    if (gintsts.b.disconnect)
    {
      retval |= USB_OTG_USBH_handle_Disconnect_ISR (pdev);  
      
    }
    
    if (gintsts.b.incomplisoout)
    {
      retval |= USB_OTG_USBH_handle_IncompletePeriodicXfer_ISR (pdev);
    }
    
    
  }
  return retval;
}

static uint32_t USB_OTG_USBH_handle_hc_ISR (USB_OTG_CORE_HANDLE *pdev)
{
  USB_OTG_HAINT_TypeDef        haint;
  USB_OTG_HCCHAR_TypeDef       hcchar;
  uint32_t i = 0;
  uint32_t retval = 0;
  
  /* Clear appropriate bits in HCINTn to clear the interrupt bit in
  * GINTSTS */
  
  haint.d32 = USB_OTG_ReadHostAllChannels_intr(pdev);
  
  for (i = 0; i < pdev->cfg.host_channels ; i++)
  {
    if (haint.b.chint & (1 << i))
    {
      hcchar.d32 = USB_OTG_READ_REG32(&pdev->regs.HC_REGS[i]->HCCHAR);
      
      if (hcchar.b.epdir)
      {
        retval |= USB_OTG_USBH_handle_hc_n_In_ISR (pdev, i);
      }
      else
      {
        retval |=  USB_OTG_USBH_handle_hc_n_Out_ISR (pdev, i);
      }
    }
  }
  
  return retval;
}

static uint32_t USB_OTG_USBH_handle_sof_ISR (USB_OTG_CORE_HANDLE *pdev)
{
  USB_OTG_GINTSTS_TypeDef      gintsts;
  gintsts.d32 = 0;
  
  USBH_HCD_INT_fops->SOF(pdev);
  
  /* Clear interrupt */
  gintsts.b.sofintr = 1;
  USB_OTG_WRITE_REG32(&pdev->regs.GREGS->GINTSTS, gintsts.d32);
  
  return 1;
}

static uint32_t USB_OTG_USBH_handle_Disconnect_ISR (USB_OTG_CORE_HANDLE *pdev)
{
  USB_OTG_GINTSTS_TypeDef      gintsts;
  
  gintsts.d32 = 0;
  
  USBH_HCD_INT_fops->DevDisconnected(pdev);
  
  /* Clear interrupt */
  gintsts.b.disconnect = 1;
  USB_OTG_WRITE_REG32(&pdev->regs.GREGS->GINTSTS, gintsts.d32);
  
  return 1;
}
#if defined ( __ICCARM__ ) 
#pragma optimize = none
#endif /* __CC_ARM */

static uint32_t USB_OTG_USBH_handle_nptxfempty_ISR (USB_OTG_CORE_HANDLE *pdev)
{
  USB_OTG_GINTMSK_TypeDef      intmsk;
  USB_OTG_HNPTXSTS_TypeDef     hnptxsts; 
  uint16_t                     len_words , len; 
  
  hnptxsts.d32 = USB_OTG_READ_REG32(&pdev->regs.GREGS->HNPTXSTS);
  
  len_words = (pdev->host.hc[hnptxsts.b.nptxqtop.chnum].xfer_len + 3) / 4;
  
  while ((hnptxsts.b.nptxfspcavail > len_words)&&
         (pdev->host.hc[hnptxsts.b.nptxqtop.chnum].xfer_len != 0))
  {
    
    len = hnptxsts.b.nptxfspcavail * 4;
    
    if (len > pdev->host.hc[hnptxsts.b.nptxqtop.chnum].xfer_len)
    {
      /* Last packet */
      len = pdev->host.hc[hnptxsts.b.nptxqtop.chnum].xfer_len;
      
      intmsk.d32 = 0;
      intmsk.b.nptxfempty = 1;
      USB_OTG_MODIFY_REG32( &pdev->regs.GREGS->GINTMSK, intmsk.d32, 0);       
    }
    
    len_words = (pdev->host.hc[hnptxsts.b.nptxqtop.chnum].xfer_len + 3) / 4;
    
    USB_OTG_WritePacket (pdev , pdev->host.hc[hnptxsts.b.nptxqtop.chnum].xfer_buff, hnptxsts.b.nptxqtop.chnum, len);
    
    pdev->host.hc[hnptxsts.b.nptxqtop.chnum].xfer_buff  += len;
    pdev->host.hc[hnptxsts.b.nptxqtop.chnum].xfer_len   -= len;
    pdev->host.hc[hnptxsts.b.nptxqtop.chnum].xfer_count  += len; 
    
    hnptxsts.d32 = USB_OTG_READ_REG32(&pdev->regs.GREGS->HNPTXSTS);
  }  
  
  return 1;
}
#if defined ( __ICCARM__ ) 
#pragma optimize = none
#endif /* __CC_ARM */

static uint32_t USB_OTG_USBH_handle_ptxfempty_ISR (USB_OTG_CORE_HANDLE *pdev)
{
  USB_OTG_GINTMSK_TypeDef      intmsk;
  USB_OTG_HPTXSTS_TypeDef      hptxsts; 
  uint16_t                     len_words , len; 
  
  hptxsts.d32 = USB_OTG_READ_REG32(&pdev->regs.HREGS->HPTXSTS);
  
  len_words = (pdev->host.hc[hptxsts.b.ptxqtop.chnum].xfer_len + 3) / 4;
  
  while ((hptxsts.b.ptxfspcavail > len_words)&&
         (pdev->host.hc[hptxsts.b.ptxqtop.chnum].xfer_len != 0))    
  {
    
    len = hptxsts.b.ptxfspcavail * 4;
    
    if (len > pdev->host.hc[hptxsts.b.ptxqtop.chnum].xfer_len)
    {
      len = pdev->host.hc[hptxsts.b.ptxqtop.chnum].xfer_len;
      /* Last packet */
      intmsk.d32 = 0;
      intmsk.b.ptxfempty = 1;
      USB_OTG_MODIFY_REG32( &pdev->regs.GREGS->GINTMSK, intmsk.d32, 0); 
    }
    
    len_words = (pdev->host.hc[hptxsts.b.ptxqtop.chnum].xfer_len + 3) / 4;
    
    USB_OTG_WritePacket (pdev , pdev->host.hc[hptxsts.b.ptxqtop.chnum].xfer_buff, hptxsts.b.ptxqtop.chnum, len);
    
    pdev->host.hc[hptxsts.b.ptxqtop.chnum].xfer_buff  += len;
    pdev->host.hc[hptxsts.b.ptxqtop.chnum].xfer_len   -= len;
    pdev->host.hc[hptxsts.b.ptxqtop.chnum].xfer_count  += len; 
    
    hptxsts.d32 = USB_OTG_READ_REG32(&pdev->regs.HREGS->HPTXSTS);
  }  
  
  return 1;
}

#if defined ( __ICCARM__ ) 
#pragma optimize = none
#endif /* __CC_ARM */
static uint32_t USB_OTG_USBH_handle_port_ISR (USB_OTG_CORE_HANDLE *pdev)
{
  USB_OTG_HPRT0_TypeDef  hprt0;
  USB_OTG_HPRT0_TypeDef  hprt0_dup;
  USB_OTG_HCFG_TypeDef   hcfg;    
  uint32_t retval = 0;
  USB_OTG_GINTMSK_TypeDef  intmsk;
  
  intmsk.d32 = 0;
  hcfg.d32 = 0;
  hprt0.d32 = 0;
  hprt0_dup.d32 = 0;
  
  hprt0.d32 = USB_OTG_READ_REG32(pdev->regs.HPRT0);
  hprt0_dup.d32 = USB_OTG_READ_REG32(pdev->regs.HPRT0);
  
  /* Clear the interrupt bits in GINTSTS */
  
  hprt0_dup.b.prtena = 0;
  hprt0_dup.b.prtconndet = 0;
  hprt0_dup.b.prtenchng = 0;
  hprt0_dup.b.prtovrcurrchng = 0;
  
  /* Port Connect Detected */
  if (hprt0.b.prtconndet)
  {
    hprt0_dup.b.prtconndet = 1;
    USBH_HCD_INT_fops->DevConnected(pdev);
    retval |= 1;   
  }
  
  /* Port Enable Changed */
  if (hprt0.b.prtenchng)
  {
    hprt0_dup.b.prtenchng = 1;
    
    if (hprt0.b.prtena == 1)
    {
      if ((hprt0.b.prtspd == HPRT0_PRTSPD_LOW_SPEED) ||
          (hprt0.b.prtspd == HPRT0_PRTSPD_FULL_SPEED))
      { 
        hcfg.d32 = USB_OTG_READ_REG32(&pdev->regs.HREGS->HCFG);
        
        if (hprt0.b.prtspd == HPRT0_PRTSPD_LOW_SPEED)
        {
          USB_OTG_WRITE_REG32(&pdev->regs.HREGS->HFIR, 6000 );
          if (hcfg.b.fslspclksel != HCFG_6_MHZ)
          {
            if(pdev->cfg.phy_itface  == USB_OTG_EMBEDDED_PHY)
            {
              USB_OTG_InitFSLSPClkSel(pdev , HCFG_6_MHZ);
            }
            
            else
            {
              USB_OTG_WRITE_REG32(&pdev->regs.HREGS->HFIR, 48000 );            
              if (hcfg.b.fslspclksel != HCFG_48_MHZ)
              {
                USB_OTG_InitFSLSPClkSel(pdev ,HCFG_48_MHZ );
              }
            } 
          }
        }
      }
      
      USBH_HCD_INT_fops->DevPortEnabled(pdev);  
      
      /*unmask disconnect interrupt */
      intmsk.d32 = 0;
      intmsk.b.disconnect = 1;  
      USB_OTG_MODIFY_REG32(&pdev->regs.GREGS->GINTMSK, intmsk.d32, intmsk.d32);
    }
    else
    {
      USBH_HCD_INT_fops->DevPortDisabled(pdev);
      
    }
  }
  
  /* Overcurrent Change Interrupt */
  if (hprt0.b.prtovrcurrchng)
  {
    hprt0_dup.b.prtovrcurrchng = 1;
    retval |= 1;
  }
  
  /* Clear Port Interrupts */
  USB_OTG_WRITE_REG32(pdev->regs.HPRT0, hprt0_dup.d32);
  
  return retval;
}
#if defined ( __ICCARM__ ) 
#pragma optimize = none
#endif /* __CC_ARM */

uint32_t USB_OTG_USBH_handle_hc_n_Out_ISR (USB_OTG_CORE_HANDLE *pdev , uint32_t num)
{
  
  USB_OTG_HCINTn_TypeDef     hcint;
  USB_OTG_HCINTMSK_TypeDef  hcintmsk;
  USB_OTG_HC_REGS *hcreg;
  USB_OTG_HCCHAR_TypeDef     hcchar; 
  
  hcreg = pdev->regs.HC_REGS[num];
  hcint.d32 = USB_OTG_READ_REG32(&hcreg->HCINT);
  hcintmsk.d32 = USB_OTG_READ_REG32(&hcreg->HCINTMSK);
  hcint.d32 = hcint.d32 & hcintmsk.d32;
  
  hcchar.d32 = USB_OTG_READ_REG32(&pdev->regs.HC_REGS[num]->HCCHAR);
  
  if (hcint.b.ahberr)
  {
    CLEAR_HC_INT(hcreg ,ahberr);
    UNMASK_HOST_INT_CHH (num);
  } 
  else if (hcint.b.ack)
  {
    CLEAR_HC_INT(hcreg , ack);
  }
  else if (hcint.b.frmovrun)
  {
    UNMASK_HOST_INT_CHH (num);
    USB_OTG_HC_Halt(pdev, num);
    CLEAR_HC_INT(hcreg ,frmovrun);
  }
  else if (hcint.b.xfercompl)
  {
    pdev->host.ErrCnt[num] = 0;
    UNMASK_HOST_INT_CHH (num);
    USB_OTG_HC_Halt(pdev, num);
    CLEAR_HC_INT(hcreg , xfercompl);
    pdev->host.HC_Status[num] = HC_XFRC;            
  }
  
  else if (hcint.b.stall)
  {
    CLEAR_HC_INT(hcreg , stall);
    UNMASK_HOST_INT_CHH (num);
    USB_OTG_HC_Halt(pdev, num);
    pdev->host.HC_Status[num] = HC_STALL;      
  }
  
  else if (hcint.b.nak)
  {
    pdev->host.ErrCnt[num] = 0;
    UNMASK_HOST_INT_CHH (num);
    if (pdev->cfg.dma_enable == 0)
    {
      USB_OTG_HC_Halt(pdev, num);
    }
    CLEAR_HC_INT(hcreg , nak);
    pdev->host.HC_Status[num] = HC_NAK;      
  }
  
  else if (hcint.b.xacterr)
  {
    UNMASK_HOST_INT_CHH (num);
    USB_OTG_HC_Halt(pdev, num);
    pdev->host.HC_Status[num] = HC_XACTERR;
    CLEAR_HC_INT(hcreg , xacterr);
  }
  else if (hcint.b.nyet)
  {
    pdev->host.ErrCnt[num] = 0;
    UNMASK_HOST_INT_CHH (num);
    if (pdev->cfg.dma_enable == 0)
    {
      USB_OTG_HC_Halt(pdev, num);
    }
    CLEAR_HC_INT(hcreg , nyet);
    pdev->host.HC_Status[num] = HC_NYET;    
  }
  else if (hcint.b.datatglerr)
  {
    UNMASK_HOST_INT_CHH (num);
    USB_OTG_HC_Halt(pdev, num);
    CLEAR_HC_INT(hcreg , nak);   
    pdev->host.HC_Status[num] = HC_DATATGLERR;
    
    CLEAR_HC_INT(hcreg , datatglerr);
  }  
  else if (hcint.b.chhltd)
  {
    MASK_HOST_INT_CHH (num);
    
    if(pdev->host.HC_Status[num] == HC_XFRC)
    {
      pdev->host.URB_State[num] = URB_DONE;  
      
      if (hcchar.b.eptype == EP_TYPE_BULK)
      {
        pdev->host.hc[num].toggle_out ^= 1; 
      }
    }
    else if(pdev->host.HC_Status[num] == HC_NAK)
    {
      pdev->host.URB_State[num] = URB_NOTREADY;      
    }    
    else if(pdev->host.HC_Status[num] == HC_NYET)
    {
      if(pdev->host.hc[num].do_ping == 1)
      {
        USB_OTG_HC_DoPing(pdev, num);
      }
      pdev->host.URB_State[num] = URB_NOTREADY;      
    }      
    else if(pdev->host.HC_Status[num] == HC_STALL)
    {
      pdev->host.URB_State[num] = URB_STALL;      
    }  
    else if(pdev->host.HC_Status[num] == HC_XACTERR)
    {
      {
        pdev->host.URB_State[num] = URB_ERROR;  
      }
    }
    CLEAR_HC_INT(hcreg , chhltd);    
  }
  
  
  return 1;
}
#if defined ( __ICCARM__ ) 
#pragma optimize = none
#endif /* __CC_ARM */

uint32_t USB_OTG_USBH_handle_hc_n_In_ISR (USB_OTG_CORE_HANDLE *pdev , uint32_t num)
{
  USB_OTG_HCINTn_TypeDef     hcint;
  USB_OTG_HCINTMSK_TypeDef  hcintmsk;
  USB_OTG_HCCHAR_TypeDef     hcchar; 
  USB_OTG_HCTSIZn_TypeDef  hctsiz;
  USB_OTG_HC_REGS *hcreg;
  
  hcreg = pdev->regs.HC_REGS[num];
  hcint.d32 = USB_OTG_READ_REG32(&hcreg->HCINT);
  hcintmsk.d32 = USB_OTG_READ_REG32(&hcreg->HCINTMSK);
  hcint.d32 = hcint.d32 & hcintmsk.d32;
  hcchar.d32 = USB_OTG_READ_REG32(&pdev->regs.HC_REGS[num]->HCCHAR);
  hcintmsk.d32 = 0;
  
  if (hcint.b.ahberr)
  {
    CLEAR_HC_INT(hcreg ,ahberr);
    UNMASK_HOST_INT_CHH (num);
  }  
  else if (hcint.b.ack)
  {
    CLEAR_HC_INT(hcreg ,ack);
  }
  
  else if (hcint.b.stall)  
  {
    UNMASK_HOST_INT_CHH (num);
    pdev->host.HC_Status[num] = HC_STALL; 
    CLEAR_HC_INT(hcreg , nak);   /* Clear the NAK Condition */
    CLEAR_HC_INT(hcreg , stall); /* Clear the STALL Condition */
    hcint.b.nak = 0;           /* NOTE: When there is a 'stall', reset also nak, 
                                  else, the pdev->host.HC_Status = HC_STALL
    will be overwritten by 'nak' in code below */
    USB_OTG_HC_Halt(pdev, num);    
  }
  else if (hcint.b.datatglerr)
  {
    UNMASK_HOST_INT_CHH (num);
    USB_OTG_HC_Halt(pdev, num);
    CLEAR_HC_INT(hcreg , nak);   
    pdev->host.HC_Status[num] = HC_DATATGLERR; 
    CLEAR_HC_INT(hcreg , datatglerr);
  }    
  
  if (hcint.b.frmovrun)
  {
    UNMASK_HOST_INT_CHH (num);
    USB_OTG_HC_Halt(pdev, num);
    CLEAR_HC_INT(hcreg ,frmovrun);
  }
  
  else if (hcint.b.xfercompl)
  {
    if (pdev->cfg.dma_enable == 1)
    {
      hctsiz.d32 = USB_OTG_READ_REG32(&pdev->regs.HC_REGS[num]->HCTSIZ);
      pdev->host.XferCnt[num] =  pdev->host.hc[num].xfer_len - hctsiz.b.xfersize;
    }
    
    pdev->host.HC_Status[num] = HC_XFRC;     
    pdev->host.ErrCnt [num]= 0;
    CLEAR_HC_INT(hcreg , xfercompl);
    
    if ((hcchar.b.eptype == EP_TYPE_CTRL)||
        (hcchar.b.eptype == EP_TYPE_BULK))
    {
      UNMASK_HOST_INT_CHH (num);
      USB_OTG_HC_Halt(pdev, num);
      CLEAR_HC_INT(hcreg , nak); 
      pdev->host.hc[num].toggle_in ^= 1;
      
    }
    else if(hcchar.b.eptype == EP_TYPE_INTR)
    {
      hcchar.b.oddfrm  = 1;
      USB_OTG_WRITE_REG32(&pdev->regs.HC_REGS[num]->HCCHAR, hcchar.d32); 
      pdev->host.URB_State[num] = URB_DONE;  
    } 
  }
  else if (hcint.b.chhltd)
  {
    MASK_HOST_INT_CHH (num);
    
    if(pdev->host.HC_Status[num] == HC_XFRC)
    {
      pdev->host.URB_State[num] = URB_DONE;      
    }
    
    else if (pdev->host.HC_Status[num] == HC_STALL) 
    {
      pdev->host.URB_State[num] = URB_STALL;
    }   
    
    else if((pdev->host.HC_Status[num] == HC_XACTERR) ||
            (pdev->host.HC_Status[num] == HC_DATATGLERR))
    {
      pdev->host.ErrCnt[num] = 0;
      pdev->host.URB_State[num] = URB_ERROR;  
      
    }
    else if(hcchar.b.eptype == EP_TYPE_INTR)
    {
      pdev->host.hc[num].toggle_in ^= 1;
    }
    
    CLEAR_HC_INT(hcreg , chhltd);    
    
  }    
  else if (hcint.b.xacterr)
  {
    UNMASK_HOST_INT_CHH (num);
    pdev->host.HC_Status[num] = HC_XACTERR;
    USB_OTG_HC_Halt(pdev, num);
    CLEAR_HC_INT(hcreg , xacterr);    
  }
  else if (hcint.b.nak)  
  {  
    if(hcchar.b.eptype == EP_TYPE_INTR)
    {
      UNMASK_HOST_INT_CHH (num);
      if (pdev->cfg.dma_enable == 0)
      {
        USB_OTG_HC_Halt(pdev, num);
      }
    }
    
    pdev->host.HC_Status[num] = HC_NAK;
    CLEAR_HC_INT(hcreg , nak);  
    
    if  ((hcchar.b.eptype == EP_TYPE_CTRL)||
              (hcchar.b.eptype == EP_TYPE_BULK))
    {
      /* re-activate the channel  */
      hcchar.b.chen = 1;
      hcchar.b.chdis = 0;
      USB_OTG_WRITE_REG32(&pdev->regs.HC_REGS[num]->HCCHAR, hcchar.d32); 
    }
  }
  
  
  return 1;
  
}

#if defined ( __ICCARM__ ) 
#pragma optimize = none
#endif /* __CC_ARM */
static uint32_t USB_OTG_USBH_handle_rx_qlvl_ISR (USB_OTG_CORE_HANDLE *pdev)
{
  USB_OTG_GRXFSTS_TypeDef       grxsts;
  USB_OTG_GINTMSK_TypeDef       intmsk;
  USB_OTG_HCTSIZn_TypeDef       hctsiz; 
  USB_OTG_HCCHAR_TypeDef        hcchar;
  __IO uint8_t                  channelnum =0;  
  uint32_t                      count;    
  
  /* Disable the Rx Status Queue Level interrupt */
  intmsk.d32 = 0;
  intmsk.b.rxstsqlvl = 1;
  USB_OTG_MODIFY_REG32( &pdev->regs.GREGS->GINTMSK, intmsk.d32, 0);
  
  grxsts.d32 = USB_OTG_READ_REG32(&pdev->regs.GREGS->GRXSTSP);
  channelnum = grxsts.b.chnum;  
  hcchar.d32 = USB_OTG_READ_REG32(&pdev->regs.HC_REGS[channelnum]->HCCHAR);
  
  switch (grxsts.b.pktsts)
  {
  case GRXSTS_PKTSTS_IN:
    /* Read the data into the host buffer. */
    if ((grxsts.b.bcnt > 0) && (pdev->host.hc[channelnum].xfer_buff != (void  *)0))
    {  
      
      USB_OTG_ReadPacket(pdev, pdev->host.hc[channelnum].xfer_buff, grxsts.b.bcnt);
      /*manage multiple Xfer */
      pdev->host.hc[grxsts.b.chnum].xfer_buff += grxsts.b.bcnt;           
      pdev->host.hc[grxsts.b.chnum].xfer_count  += grxsts.b.bcnt;
      
      
      count = pdev->host.hc[channelnum].xfer_count;
      pdev->host.XferCnt[channelnum]  = count;
      
      hctsiz.d32 = USB_OTG_READ_REG32(&pdev->regs.HC_REGS[channelnum]->HCTSIZ);
      if(hctsiz.b.pktcnt > 0)
      {
        /* re-activate the channel when more packets are expected */
        hcchar.b.chen = 1;
        hcchar.b.chdis = 0;
        USB_OTG_WRITE_REG32(&pdev->regs.HC_REGS[channelnum]->HCCHAR, hcchar.d32);
      }
    }
    break;
    
  case GRXSTS_PKTSTS_IN_XFER_COMP:
    
  case GRXSTS_PKTSTS_DATA_TOGGLE_ERR:
  case GRXSTS_PKTSTS_CH_HALTED:
  default:
    break;
  }
  
  /* Enable the Rx Status Queue Level interrupt */
  intmsk.b.rxstsqlvl = 1;
  USB_OTG_MODIFY_REG32(&pdev->regs.GREGS->GINTMSK, 0, intmsk.d32);
  return 1;
}

#if defined ( __ICCARM__ ) 
#pragma optimize = none
#endif /* __CC_ARM */
static uint32_t USB_OTG_USBH_handle_IncompletePeriodicXfer_ISR (USB_OTG_CORE_HANDLE *pdev)
{
  
  USB_OTG_GINTSTS_TypeDef       gintsts;
  USB_OTG_HCCHAR_TypeDef        hcchar; 
  
  
  
  
  hcchar.d32 = USB_OTG_READ_REG32(&pdev->regs.HC_REGS[0]->HCCHAR);
  hcchar.b.chen = 1;
  hcchar.b.chdis = 1;
  USB_OTG_WRITE_REG32(&pdev->regs.HC_REGS[0]->HCCHAR, hcchar.d32);  
  
  gintsts.d32 = 0;
  /* Clear interrupt */
  gintsts.b.incomplisoout = 1;
  USB_OTG_WRITE_REG32(&pdev->regs.GREGS->GINTSTS, gintsts.d32);
  
  return 1;
}

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