LUFA/Drivers/USB/LowLevel/Template/Template_Pipe_RW.c

   1 uint8_t TEMPLATE_FUNC_NAME (void* Buffer, uint16_t Length _CALLBACK_PARAM)
   2 {
   3         uint8_t* DataStream = (uint8_t*)(Buffer + TEMPLATE_BUFFER_OFFSET(Length));
   4         uint8_t  ErrorCode;
   5
   6         Pipe_SetToken(TEMPLATE_TOKEN);
   7
   8         if ((ErrorCode = Pipe_WaitUntilReady()))
   9           return ErrorCode;
  10
  11         #if defined(FAST_STREAM_TRANSFERS)
  12         uint8_t BytesRemToAlignment = (Pipe_BytesInPipe() & 0x07);
  13
  14         if (Length >= 8)
  15         {
  16                 Length -= BytesRemToAlignment;
  17
  18                 switch (BytesRemToAlignment)
  19                 {
  20                         default:
  21                                 do
  22                                 {
  23                                         if (!(Pipe_IsReadWriteAllowed()))
  24                                         {
  25                                                 TEMPLATE_CLEAR_PIPE();
  26
  27                                                 #if !defined(NO_STREAM_CALLBACKS)
  28                                                 if ((Callback != NULL) && (Callback() == STREAMCALLBACK_Abort))
  29                                                   return PIPE_RWSTREAM_CallbackAborted;
  30                                                 #endif
  31
  32                                                 if ((ErrorCode = Pipe_WaitUntilReady()))
  33                                                   return ErrorCode;
  34                                         }
  35
  36                                         Length -= 8;
  37
  38                                         TEMPLATE_TRANSFER_BYTE(DataStream);
  39                         case 7: TEMPLATE_TRANSFER_BYTE(DataStream);
  40                         case 6: TEMPLATE_TRANSFER_BYTE(DataStream);
  41                         case 5: TEMPLATE_TRANSFER_BYTE(DataStream);
  42                         case 4: TEMPLATE_TRANSFER_BYTE(DataStream);
  43                         case 3: TEMPLATE_TRANSFER_BYTE(DataStream);
  44                         case 2: TEMPLATE_TRANSFER_BYTE(DataStream);
  45                         case 1: TEMPLATE_TRANSFER_BYTE(DataStream);
  46                                 } while (Length >= 8);
  47                 }
  48         }
  49         #endif
  50
  51         while (Length)
  52         {
  53                 if (!(Pipe_IsReadWriteAllowed()))
  54                 {
  55                         TEMPLATE_CLEAR_PIPE();
  56
  57                         #if !defined(NO_STREAM_CALLBACKS)
  58                         if ((Callback != NULL) && (Callback() == STREAMCALLBACK_Abort))
  59                           return PIPE_RWSTREAM_CallbackAborted;
  60                         #endif
  61
  62                         if ((ErrorCode = Pipe_WaitUntilReady()))
  63                           return ErrorCode;
  64                 }
  65                 else
  66                 {
  67                         TEMPLATE_TRANSFER_BYTE(DataStream);
  68                         Length--;
  69                 }
  70         }
  71
  72         return PIPE_RWSTREAM_NoError;
  73 }
  74
  75 #undef TEMPLATE_FUNC_NAME
  76 #undef TEMPLATE_TOKEN
  77 #undef TEMPLATE_TRANSFER_BYTE
  78 #undef TEMPLATE_CLEAR_PIPE
  79 #undef TEMPLATE_BUFFER_OFFSET