LUFA/Drivers/USB/Class/Device/Audio.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   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 disclaim 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 "Audio.h"
  32
  33 void USB_Audio_ProcessControlPacket(USB_ClassInfo_Audio_t* AudioInterfaceInfo)
  34 {
  35         if (!(Endpoint_IsSETUPReceived()))
  36           return;
  37
  38         if (USB_ControlRequest.wIndex != AudioInterfaceInfo->StreamingInterfaceNumber)
  39           return;
  40
  41         switch (USB_ControlRequest.bRequest)
  42         {
  43                 case REQ_SetInterface:
  44                         if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_STANDARD | REQREC_INTERFACE))
  45                         {
  46                                 Endpoint_ClearSETUP();
  47
  48                                 AudioInterfaceInfo->InterfaceEnabled = (USB_ControlRequest.wValue != 0);
  49
  50                                 while (!(Endpoint_IsINReady()));
  51                                 Endpoint_ClearIN();
  52                         }
  53
  54                         break;
  55         }
  56 }
  57
  58 bool USB_Audio_ConfigureEndpoints(USB_ClassInfo_Audio_t* AudioInterfaceInfo)
  59 {
  60         if (AudioInterfaceInfo->DataINEndpointNumber)
  61         {
  62                 if (!(Endpoint_ConfigureEndpoint(AudioInterfaceInfo->DataINEndpointNumber, EP_TYPE_ISOCHRONOUS,
  63                                                                                  ENDPOINT_DIR_IN, AudioInterfaceInfo->DataINEndpointSize,
  64                                                                                  ENDPOINT_BANK_DOUBLE)))
  65                 {
  66                         return false;
  67                 }
  68         }
  69
  70         if (AudioInterfaceInfo->DataOUTEndpointNumber)
  71         {
  72                 if (!(Endpoint_ConfigureEndpoint(AudioInterfaceInfo->DataOUTEndpointNumber, EP_TYPE_ISOCHRONOUS,
  73                                                                                  ENDPOINT_DIR_OUT, AudioInterfaceInfo->DataOUTEndpointSize,
  74                                                                                  ENDPOINT_BANK_DOUBLE)))
  75                 {
  76                         return false;
  77                 }
  78         }
  79
  80         return true;
  81 }
  82
  83 int8_t USB_Audio_ReadSample8(void)
  84 {
  85         int8_t Sample;
  86
  87         Sample = Endpoint_Read_Byte();
  88
  89         if (!(Endpoint_IsReadWriteAllowed()))
  90           Endpoint_ClearOUT();
  91
  92         return Sample;
  93 }
  94
  95 int16_t USB_Audio_ReadSample16(void)
  96 {
  97         int16_t Sample;
  98
  99         Sample = (int16_t)Endpoint_Read_Word_LE();
 100
 101         if (!(Endpoint_IsReadWriteAllowed()))
 102           Endpoint_ClearOUT();
 103
 104         return Sample;
 105 }
 106
 107 int32_t USB_Audio_ReadSample24(void)
 108 {
 109         int32_t Sample;
 110
 111         Sample = (((uint32_t)Endpoint_Read_Byte() << 16) | Endpoint_Read_Word_LE());
 112
 113         if (!(Endpoint_IsReadWriteAllowed()))
 114           Endpoint_ClearOUT();
 115
 116         return Sample;
 117 }
 118
 119 void USB_Audio_WriteSample8(int8_t Sample)
 120 {
 121         Endpoint_Write_Byte(Sample);
 122
 123         if (!(Endpoint_IsReadWriteAllowed()))
 124           Endpoint_ClearIN();
 125 }
 126
 127 void USB_Audio_WriteSample16(int16_t Sample)
 128 {
 129         Endpoint_Write_Word_LE(Sample);
 130
 131         if (!(Endpoint_IsReadWriteAllowed()))
 132           Endpoint_ClearIN();
 133 }
 134
 135 void USB_Audio_WriteSample24(int32_t Sample)
 136 {
 137         Endpoint_Write_Byte(Sample >> 16);
 138         Endpoint_Write_Word_LE(Sample);
 139
 140         if (!(Endpoint_IsReadWriteAllowed()))
 141           Endpoint_ClearIN();
 142 }
 143
 144 bool USB_Audio_IsSampleReceived(USB_ClassInfo_Audio_t* AudioInterfaceInfo)
 145 {
 146         Endpoint_SelectEndpoint(AudioInterfaceInfo->DataOUTEndpointNumber);
 147         return Endpoint_IsOUTReceived();
 148 }
 149
 150 bool USB_Audio_IsReadyForNextSample(USB_ClassInfo_Audio_t* AudioInterfaceInfo)
 151 {
 152         Endpoint_SelectEndpoint(AudioInterfaceInfo->DataINEndpointNumber);
 153         return Endpoint_IsINReady();
 154 }