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 void USB_Audio_USBTask(USB_ClassInfo_Audio_t* AudioInterfaceInfo)
  84 {
  85
  86 }
  87
  88 int8_t USB_Audio_ReadSample8(void)
  89 {
  90         int8_t Sample;
  91
  92         Sample = Endpoint_Read_Byte();
  93
  94         if (!(Endpoint_IsReadWriteAllowed()))
  95           Endpoint_ClearOUT();
  96
  97         return Sample;
  98 }
  99
 100 int16_t USB_Audio_ReadSample16(void)
 101 {
 102         int16_t Sample;
 103
 104         Sample = (int16_t)Endpoint_Read_Word_LE();
 105
 106         if (!(Endpoint_IsReadWriteAllowed()))
 107           Endpoint_ClearOUT();
 108
 109         return Sample;
 110 }
 111
 112 int32_t USB_Audio_ReadSample24(void)
 113 {
 114         int32_t Sample;
 115
 116         Sample = (((uint32_t)Endpoint_Read_Byte() << 16) | Endpoint_Read_Word_LE());
 117
 118         if (!(Endpoint_IsReadWriteAllowed()))
 119           Endpoint_ClearOUT();
 120
 121         return Sample;
 122 }
 123
 124 void USB_Audio_WriteSample8(int8_t Sample)
 125 {
 126         Endpoint_Write_Byte(Sample);
 127
 128         if (!(Endpoint_IsReadWriteAllowed()))
 129           Endpoint_ClearIN();
 130 }
 131
 132 void USB_Audio_WriteSample16(int16_t Sample)
 133 {
 134         Endpoint_Write_Word_LE(Sample);
 135
 136         if (!(Endpoint_IsReadWriteAllowed()))
 137           Endpoint_ClearIN();
 138 }
 139
 140 void USB_Audio_WriteSample24(int32_t Sample)
 141 {
 142         Endpoint_Write_Byte(Sample >> 16);
 143         Endpoint_Write_Word_LE(Sample);
 144
 145         if (!(Endpoint_IsReadWriteAllowed()))
 146           Endpoint_ClearIN();
 147 }
 148
 149 bool USB_Audio_IsSampleReceived(USB_ClassInfo_Audio_t* AudioInterfaceInfo)
 150 {
 151         Endpoint_SelectEndpoint(AudioInterfaceInfo->DataOUTEndpointNumber);
 152         return Endpoint_IsOUTReceived();
 153 }
 154
 155 bool USB_Audio_IsReadyForNextSample(USB_ClassInfo_Audio_t* AudioInterfaceInfo)
 156 {
 157         Endpoint_SelectEndpoint(AudioInterfaceInfo->DataINEndpointNumber);
 158         return Endpoint_IsINReady();
 159 }