LUFA/Drivers/USB/Core/UC3/PipeStream_UC3.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2014.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2014  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaims all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 #include "../../../../Common/Common.h"
  32 #if (ARCH == ARCH_UC3)
  33
  34 #define  __INCLUDE_FROM_USB_DRIVER
  35 #include "../USBMode.h"
  36
  37 #if defined(USB_CAN_BE_HOST)
  38
  39 #include "PipeStream_UC3.h"
  40
  41 uint8_t Pipe_Discard_Stream(uint16_t Length,
  42                             uint16_t* const BytesProcessed)
  43 {
  44         uint8_t  ErrorCode;
  45         uint16_t BytesInTransfer = 0;
  46
  47         Pipe_SetPipeToken(PIPE_TOKEN_IN);
  48
  49         if ((ErrorCode = Pipe_WaitUntilReady()))
  50           return ErrorCode;
  51
  52         if (BytesProcessed != NULL)
  53           Length -= *BytesProcessed;
  54
  55         while (Length)
  56         {
  57                 if (!(Pipe_IsReadWriteAllowed()))
  58                 {
  59                         Pipe_ClearIN();
  60
  61                         if (BytesProcessed != NULL)
  62                         {
  63                                 *BytesProcessed += BytesInTransfer;
  64                                 return PIPE_RWSTREAM_IncompleteTransfer;
  65                         }
  66
  67                         if ((ErrorCode = Pipe_WaitUntilReady()))
  68                           return ErrorCode;
  69                 }
  70                 else
  71                 {
  72                         Pipe_Discard_8();
  73
  74                         Length--;
  75                         BytesInTransfer++;
  76                 }
  77         }
  78
  79         return PIPE_RWSTREAM_NoError;
  80 }
  81
  82 uint8_t Pipe_Null_Stream(uint16_t Length,
  83                          uint16_t* const BytesProcessed)
  84 {
  85         uint8_t  ErrorCode;
  86         uint16_t BytesInTransfer = 0;
  87
  88         Pipe_SetPipeToken(PIPE_TOKEN_OUT);
  89
  90         if ((ErrorCode = Pipe_WaitUntilReady()))
  91           return ErrorCode;
  92
  93         if (BytesProcessed != NULL)
  94           Length -= *BytesProcessed;
  95
  96         while (Length)
  97         {
  98                 if (!(Pipe_IsReadWriteAllowed()))
  99                 {
 100                         Pipe_ClearOUT();
 101
 102                         if (BytesProcessed != NULL)
 103                         {
 104                                 *BytesProcessed += BytesInTransfer;
 105                                 return PIPE_RWSTREAM_IncompleteTransfer;
 106                         }
 107
 108                         USB_USBTask();
 109
 110                         if ((ErrorCode = Pipe_WaitUntilReady()))
 111                           return ErrorCode;
 112                 }
 113                 else
 114                 {
 115                         Pipe_Write_8(0);
 116
 117                         Length--;
 118                         BytesInTransfer++;
 119                 }
 120         }
 121
 122         return PIPE_RWSTREAM_NoError;
 123 }
 124
 125 /* The following abuses the C preprocessor in order to copy-paste common code with slight alterations,
 126  * so that the code needs to be written once. It is a crude form of templating to reduce code maintenance. */
 127
 128 #define  TEMPLATE_FUNC_NAME                        Pipe_Write_Stream_LE
 129 #define  TEMPLATE_BUFFER_TYPE                      const void*
 130 #define  TEMPLATE_TOKEN                            PIPE_TOKEN_OUT
 131 #define  TEMPLATE_CLEAR_PIPE()                     Pipe_ClearOUT()
 132 #define  TEMPLATE_BUFFER_OFFSET(Length)            0
 133 #define  TEMPLATE_BUFFER_MOVE(BufferPtr, Amount)   DataStream += Amount
 134 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         Pipe_Write_8(*BufferPtr)
 135 #include "Template/Template_Pipe_RW.c"
 136
 137 #define  TEMPLATE_FUNC_NAME                        Pipe_Write_Stream_BE
 138 #define  TEMPLATE_BUFFER_TYPE                      const void*
 139 #define  TEMPLATE_TOKEN                            PIPE_TOKEN_OUT
 140 #define  TEMPLATE_CLEAR_PIPE()                     Pipe_ClearOUT()
 141 #define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
 142 #define  TEMPLATE_BUFFER_MOVE(BufferPtr, Amount)   DataStream -= Amount
 143 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         Pipe_Write_8(*BufferPtr)
 144 #include "Template/Template_Pipe_RW.c"
 145
 146 #define  TEMPLATE_FUNC_NAME                        Pipe_Read_Stream_LE
 147 #define  TEMPLATE_BUFFER_TYPE                      void*
 148 #define  TEMPLATE_TOKEN                            PIPE_TOKEN_IN
 149 #define  TEMPLATE_CLEAR_PIPE()                     Pipe_ClearIN()
 150 #define  TEMPLATE_BUFFER_OFFSET(Length)            0
 151 #define  TEMPLATE_BUFFER_MOVE(BufferPtr, Amount)   DataStream += Amount
 152 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         *BufferPtr = Pipe_Read_8()
 153 #include "Template/Template_Pipe_RW.c"
 154
 155 #define  TEMPLATE_FUNC_NAME                        Pipe_Read_Stream_BE
 156 #define  TEMPLATE_BUFFER_TYPE                      void*
 157 #define  TEMPLATE_TOKEN                            PIPE_TOKEN_IN
 158 #define  TEMPLATE_CLEAR_PIPE()                     Pipe_ClearIN()
 159 #define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
 160 #define  TEMPLATE_BUFFER_MOVE(BufferPtr, Amount)   DataStream -= Amount
 161 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         *BufferPtr = Pipe_Read_8()
 162 #include "Template/Template_Pipe_RW.c"
 163
 164 #endif
 165
 166 #endif