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

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