usb_core.c

STM32实现读卡器功能,适用于STM32E-EVAL开发板

  CopyRoutine = NULL;
  wOffset = 0;

  if (Request_No == GET_DESCRIPTOR)
  {
    if (Type_Recipient == (STANDARD_REQUEST | DEVICE_RECIPIENT))
    {
      u8 wValue1 = pInformation->USBwValue1;
      if (wValue1 == DEVICE_DESCRIPTOR)
      {
        CopyRoutine = pProperty->GetDeviceDescriptor;
      }
      else if (wValue1 == CONFIG_DESCRIPTOR)
      {
        CopyRoutine = pProperty->GetConfigDescriptor;
      }
      else if (wValue1 == STRING_DESCRIPTOR)
      {
        CopyRoutine = pProperty->GetStringDescriptor;
      }  /* End of GET_DESCRIPTOR */
    }
  }

  /*GET STATUS*/
  else if ((Request_No == GET_STATUS) && (pInformation->USBwValue == 0)
           && (pInformation->USBwLength == 0x0002)
           && (pInformation->USBwIndex1 == 0))
  {
    /* GET STATUS for Device*/
    if ((Type_Recipient == (STANDARD_REQUEST | DEVICE_RECIPIENT))
        && (pInformation->USBwIndex == 0))
    {
      CopyRoutine = Standard_GetStatus;
    }

    /* GET STATUS for Interface*/
    else if (Type_Recipient == (STANDARD_REQUEST | INTERFACE_RECIPIENT))
    {
      if (((*pProperty->Class_Get_Interface_Setting)(pInformation->USBwIndex0, 0) == USB_SUCCESS)
          && (pInformation->Current_Configuration != 0))
      {
        CopyRoutine = Standard_GetStatus;
      }
    }

    /* GET STATUS for EndPoint*/
    else if (Type_Recipient == (STANDARD_REQUEST | ENDPOINT_RECIPIENT))
    {
      Related_Endpoint = (pInformation->USBwIndex0 & 0x0f);
      Reserved = pInformation->USBwIndex0 & 0x70;

      if (ValBit(pInformation->USBwIndex0, 7))
      {
        /*Get Status of endpoint & stall the request if the related_ENdpoint
        is Disabled*/
        Status = _GetEPTxStatus(Related_Endpoint);
      }
      else
      {
        Status = _GetEPRxStatus(Related_Endpoint);
      }

      if ((Related_Endpoint < Device_Table.Total_Endpoint) && (Reserved == 0)
          && (Status != 0))
      {
        CopyRoutine = Standard_GetStatus;
      }
    }

  }

  /*GET CONFIGURATION*/
  else if (Request_No == GET_CONFIGURATION)
  {
    if (Type_Recipient == (STANDARD_REQUEST | DEVICE_RECIPIENT))
    {
      CopyRoutine = Standard_GetConfiguration;
    }
  }
  /*GET INTERFACE*/
  else if (Request_No == GET_INTERFACE)
  {
    if ((Type_Recipient == (STANDARD_REQUEST | INTERFACE_RECIPIENT))
        && (pInformation->Current_Configuration != 0) && (pInformation->USBwValue == 0)
        && (pInformation->USBwIndex1 == 0) && (pInformation->USBwLength == 0x0001)
        && ((*pProperty->Class_Get_Interface_Setting)(pInformation->USBwIndex0, 0) == USB_SUCCESS))
    {
      CopyRoutine = Standard_GetInterface;
    }

  }
  
  if (CopyRoutine)
  {
    pInformation->Ctrl_Info.Usb_wOffset = wOffset;
    pInformation->Ctrl_Info.CopyData = CopyRoutine;
    /* sb in the original the cast to word was directly */
    /* now the cast is made step by step */
    (*CopyRoutine)(0);
    Result = USB_SUCCESS;
  }
  else
  {
    Result = (*pProperty->Class_Data_Setup)(pInformation->USBbRequest);
    if (Result == USB_NOT_READY)
    {
      pInformation->ControlState = PAUSE;
      return;
    }
  }

  if (pInformation->Ctrl_Info.Usb_wLength == 0xFFFF)
  {
    /* Data is not ready, wait it */
    pInformation->ControlState = PAUSE;
    return;
  }
  if ((Result == USB_UNSUPPORT) || (pInformation->Ctrl_Info.Usb_wLength == 0))
  {
    /* Unsupported request */
    pInformation->ControlState = STALLED;
    return;
  }


  if (ValBit(pInformation->USBbmRequestType, 7))
  {
    /* Device ==> Host */
    vu32 wLength = pInformation->USBwLength;
     
    /* Restrict the data length to be the one host asks */
    if (pInformation->Ctrl_Info.Usb_wLength > wLength)
    {
      pInformation->Ctrl_Info.Usb_wLength = wLength;
    }
    
    else if (pInformation->Ctrl_Info.Usb_wLength < pInformation->USBwLength)
    {
      if (pInformation->Ctrl_Info.Usb_wLength < pProperty->MaxPacketSize)
      {
        Data_Mul_MaxPacketSize = FALSE;
      }
      else if ((pInformation->Ctrl_Info.Usb_wLength % pProperty->MaxPacketSize) == 0)
      {
        Data_Mul_MaxPacketSize = TRUE;
      }
    }   

    pInformation->Ctrl_Info.PacketSize = pProperty->MaxPacketSize;
    DataStageIn();
  }
  else
  {
    pInformation->ControlState = OUT_DATA;
    vSetEPRxStatus(EP_RX_VALID); /* enable for next data reception */
  }

  return;
}

/*******************************************************************************
* Function Name  : Setup0_Process
* Description    : Get the device request data and dispatch to individual process.
* Input          : None.
* Output         : None.
* Return         : Post0_Process.
*******************************************************************************/
u8 Setup0_Process(void)
{

  union
  {
    u8* b;
    u16* w;
  } pBuf;

  pBuf.b = PMAAddr + (u8 *)(_GetEPRxAddr(ENDP0) * 2); /* *2 for 32 bits addr */

  if (pInformation->ControlState != PAUSE)
  {
    pInformation->USBbmRequestType = *pBuf.b++; /* bmRequestType */
    pInformation->USBbRequest = *pBuf.b++; /* bRequest */
    pBuf.w++;  /* word not accessed because of 32 bits addressing */
    pInformation->USBwValue = ByteSwap(*pBuf.w++); /* wValue */
    pBuf.w++;  /* word not accessed because of 32 bits addressing */
    pInformation->USBwIndex  = ByteSwap(*pBuf.w++); /* wIndex */
    pBuf.w++;  /* word not accessed because of 32 bits addressing */
    pInformation->USBwLength = *pBuf.w; /* wLength */
  }

  pInformation->ControlState = SETTING_UP;
  if (pInformation->USBwLength == 0)
  {
    /* Setup with no data stage */
    NoData_Setup0();
  }
  else
  {
    /* Setup with data stage */
    Data_Setup0();
  }
  return Post0_Process();
}

/*******************************************************************************
* Function Name  : In0_Process
* Description    : Process the IN token on all default endpoint.
* Input          : None.
* Output         : None.
* Return         : Post0_Process.
*******************************************************************************/
u8 In0_Process(void)
{
  u32 ControlState = pInformation->ControlState;

  if ((ControlState == IN_DATA) || (ControlState == LAST_IN_DATA))
  {
    DataStageIn();
    /* ControlState may be changed outside the function */
    ControlState = pInformation->ControlState;
  }

  else if (ControlState == WAIT_STATUS_IN)
  {
    if ((pInformation->USBbRequest == SET_ADDRESS) &&
        (Type_Recipient == (STANDARD_REQUEST | DEVICE_RECIPIENT)))
    {
      SetDeviceAddress(pInformation->USBwValue0);
      pUser_Standard_Requests->User_SetDeviceAddress();
    }
    (*pProperty->Process_Status_IN)();
    ControlState = STALLED;
  }

  else
  {
    ControlState = STALLED;
  }

  pInformation->ControlState = ControlState;

  return Post0_Process();
}

/*******************************************************************************
* Function Name  : Out0_Process
* Description    : Process the OUT token on all default endpoint.
* Input          : None.
* Output         : None.
* Return         : Post0_Process.
*******************************************************************************/
u8 Out0_Process(void)
{
  u32 ControlState = pInformation->ControlState;

  if ((ControlState == OUT_DATA) || (ControlState == LAST_OUT_DATA))
  {
    DataStageOut();
    ControlState = pInformation->ControlState; /* may be changed outside the function */
  }

  else if (ControlState == WAIT_STATUS_OUT)
  {
    (*pProperty->Process_Status_OUT)();
    ControlState = STALLED;
  }

  else if ((ControlState == IN_DATA) || (ControlState == LAST_IN_DATA))
  {
    /* host aborts the transfer before finish */
    ControlState = STALLED;
  }

  /* Unexpect state, STALL the endpoint */
  else
  {
    ControlState = STALLED;
  }

  pInformation->ControlState = ControlState;

  return Post0_Process();
}

/*******************************************************************************
* Function Name  : Post0_Process
* Description    : Stall the Endpoint 0 in case of error.
* Input          : None.
* Output         : None.
* Return         : - 0 if the control State is in PAUSE
*                  - 1 if not.
*******************************************************************************/
u8 Post0_Process(void)
{
  SetEPRxCount(ENDP0, Device_Property.MaxPacketSize);

  if (pInformation->ControlState == STALLED)
  {
    vSetEPRxStatus(EP_RX_STALL);
    vSetEPTxStatus(EP_TX_STALL);
  }

  return (pInformation->ControlState == PAUSE);
}

/*******************************************************************************
* Function Name  : SetDeviceAddress.
* Description    : Set the device and all the used Endpoints addresses.
* Input          : - Val: device adress.
* Output         : None.
* Return         : None.
*******************************************************************************/
void SetDeviceAddress(u8 Val)
{
  u32 i;
  u32 nEP = Device_Table.Total_Endpoint;

  /* set address in every used endpoint */
  for (i = 0; i < nEP; i++)
  {
    _SetEPAddress((u8)i, (u8)i);
  } /* for */
  _SetDADDR(Val | DADDR_EF); /* set device address and enable function */
}

/*******************************************************************************
* Function Name  : NOP_Process
* Description    : No operation function.
* Input          : None.
* Output         : None.
* Return         : None.
*******************************************************************************/
void NOP_Process(void)
{
}

/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/