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root / LUFA / Drivers / USB / Core / UC3 / PipeStream_UC3.c @ 978b99e5

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/*
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             LUFA Library
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     Copyright (C) Dean Camera, 2011.
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  dean [at] fourwalledcubicle [dot] com
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           www.lufa-lib.org
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*/
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/*
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  Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)
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  Permission to use, copy, modify, distribute, and sell this 
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  software and its documentation for any purpose is hereby granted
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  without fee, provided that the above copyright notice appear in 
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  all copies and that both that the copyright notice and this
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  permission notice and warranty disclaimer appear in supporting 
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  documentation, and that the name of the author not be used in 
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  advertising or publicity pertaining to distribution of the 
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  software without specific, written prior permission.
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  The author disclaim all warranties with regard to this
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  software, including all implied warranties of merchantability
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  and fitness.  In no event shall the author be liable for any
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  special, indirect or consequential damages or any damages
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  whatsoever resulting from loss of use, data or profits, whether
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  in an action of contract, negligence or other tortious action,
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  arising out of or in connection with the use or performance of
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  this software.
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*/
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#define  __INCLUDE_FROM_USB_DRIVER
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#include "../USBMode.h"
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#if defined(USB_CAN_BE_HOST)
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#include "PipeStream_UC3.h"
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uint8_t Pipe_Discard_Stream(uint16_t Length,
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                            uint16_t* const BytesProcessed)
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{
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        uint8_t  ErrorCode;
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        uint16_t BytesInTransfer = 0;
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        Pipe_SetPipeToken(PIPE_TOKEN_IN);
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        if ((ErrorCode = Pipe_WaitUntilReady()))
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          return ErrorCode;
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        if (BytesProcessed != NULL)
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          Length -= *BytesProcessed;
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        while (Length)
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        {
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                if (!(Pipe_IsReadWriteAllowed()))
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                {
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                        Pipe_ClearIN();
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                        if (BytesProcessed != NULL)
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                        {
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                                *BytesProcessed += BytesInTransfer;
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                                return PIPE_RWSTREAM_IncompleteTransfer;
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                        }
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                        if ((ErrorCode = Pipe_WaitUntilReady()))
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                          return ErrorCode;
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                }
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                else
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                {
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                        Pipe_Discard_8();
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                        Length--;
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                        BytesInTransfer++;
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                }
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        }
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        return PIPE_RWSTREAM_NoError;
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}
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uint8_t Pipe_Null_Stream(uint16_t Length,
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                         uint16_t* const BytesProcessed)
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{
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        uint8_t  ErrorCode;
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        uint16_t BytesInTransfer = 0;
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        Pipe_SetPipeToken(PIPE_TOKEN_OUT);
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        if ((ErrorCode = Pipe_WaitUntilReady()))
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          return ErrorCode;
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        if (BytesProcessed != NULL)
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          Length -= *BytesProcessed;
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        while (Length)
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        {
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                if (!(Pipe_IsReadWriteAllowed()))
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                {
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                        Pipe_ClearOUT();
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                        if (BytesProcessed != NULL)
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                        {
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                                *BytesProcessed += BytesInTransfer;
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                                return PIPE_RWSTREAM_IncompleteTransfer;
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                        }
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                        USB_USBTask();
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                        if ((ErrorCode = Pipe_WaitUntilReady()))
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                          return ErrorCode;
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                }
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                else
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                {
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                        Pipe_Write_8(0);
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                        Length--;
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                        BytesInTransfer++;
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                }
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        }
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        return PIPE_RWSTREAM_NoError;
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}
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/* The following abuses the C preprocessor in order to copy-paste common code with slight alterations,
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 * so that the code needs to be written once. It is a crude form of templating to reduce code maintenance. */
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#define  TEMPLATE_FUNC_NAME                        Pipe_Write_Stream_LE
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#define  TEMPLATE_BUFFER_TYPE                      const void*
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#define  TEMPLATE_TOKEN                            PIPE_TOKEN_OUT
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#define  TEMPLATE_CLEAR_PIPE()                     Pipe_ClearOUT()
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#define  TEMPLATE_BUFFER_OFFSET(Length)            0
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#define  TEMPLATE_BUFFER_MOVE(BufferPtr, Amount)   DataStream += Amount
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#define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         Pipe_Write_8(*BufferPtr)
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#include "Template/Template_Pipe_RW.c"
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#define  TEMPLATE_FUNC_NAME                        Pipe_Write_Stream_BE
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#define  TEMPLATE_BUFFER_TYPE                      const void*
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#define  TEMPLATE_TOKEN                            PIPE_TOKEN_OUT
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#define  TEMPLATE_CLEAR_PIPE()                     Pipe_ClearOUT()
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#define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
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#define  TEMPLATE_BUFFER_MOVE(BufferPtr, Amount)   DataStream -= Amount
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#define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         Pipe_Write_8(*BufferPtr)
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#include "Template/Template_Pipe_RW.c"
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#define  TEMPLATE_FUNC_NAME                        Pipe_Read_Stream_LE
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#define  TEMPLATE_BUFFER_TYPE                      void*
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#define  TEMPLATE_TOKEN                            PIPE_TOKEN_IN
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#define  TEMPLATE_CLEAR_PIPE()                     Pipe_ClearIN()
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#define  TEMPLATE_BUFFER_OFFSET(Length)            0
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#define  TEMPLATE_BUFFER_MOVE(BufferPtr, Amount)   DataStream += Amount
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#define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         *BufferPtr = Pipe_Read_8()
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#include "Template/Template_Pipe_RW.c"
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#define  TEMPLATE_FUNC_NAME                        Pipe_Read_Stream_BE
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#define  TEMPLATE_BUFFER_TYPE                      void*
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#define  TEMPLATE_TOKEN                            PIPE_TOKEN_IN
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#define  TEMPLATE_CLEAR_PIPE()                     Pipe_ClearIN()
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#define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
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#define  TEMPLATE_BUFFER_MOVE(BufferPtr, Amount)   DataStream -= Amount
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#define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         *BufferPtr = Pipe_Read_8()
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#include "Template/Template_Pipe_RW.c"
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#endif
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