},
.Audio_AudioFormat =
{
.Header = {.Size = sizeof(USB_Audio_Format_t), .Type = DTYPE_CSInterface},
.Subtype = DSUBTYPE_Format,
.FormatType = 0x01,
.Channels = 0x02,
.SubFrameSize = 0x02,
.BitResolution = 16,
.SampleFrequencyType = (sizeof(ConfigurationDescriptor.Audio_AudioFormat.SampleFrequencies) /
sizeof(Audio_SampleFreq_t)),
.SampleFrequencies = {SAMPLE_FREQ(AUDIO_SAMPLE_FREQUENCY)}
},
.Audio_StreamEndpoint =
{
.Endpoint =
{
.Header = {.Size = sizeof(USB_Audio_StreamEndpoint_Std_t), .Type = DTYPE_Endpoint},
.EndpointAddress = (ENDPOINT_DESCRIPTOR_DIR_OUT | AUDIO_STREAM_EPNUM),
.Attributes = (EP_TYPE_ISOCHRONOUS | ENDPOINT_ATTR_SYNC | ENDPOINT_USAGE_DATA),
.EndpointSize = AUDIO_STREAM_EPSIZE,
.PollingIntervalMS = 1
},
.Refresh = 0,
0x01, /* bTerminalLink */ 0x01, /* bDelay */ 0x01, /* wFormatTag AUDIO_FORMAT_PCM 0x0001*/ 0x00, /* 07 byte*/ /* USB Speaker Audio Type III Format Interface Descriptor */ 0x0B, /* bLength */ AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType */ AUDIO_STREAMING_FORMAT_TYPE, /* bDescriptorSubtype */ AUDIO_FORMAT_TYPE_III, /* bFormatType */ 0x02, /* bNrChannels */ 0x02, /* bSubFrameSize : 2 Bytes per frame (16bits) */ 16, /* bBitResolution (16-bits per sample) */ 0x01, /* bSamFreqType only one frequency supported */ SAMPLE_FREQ(USBD_AUDIO_FREQ), /* Audio sampling frequency coded on 3 bytes */ /* 11 byte*/ /* Endpoint 1 - Standard Descriptor */ AUDIO_STANDARD_ENDPOINT_DESC_SIZE, /* bLength */ USB_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType */ AUDIO_OUT_EP, /* bEndpointAddress 1 out endpoint*/ USB_ENDPOINT_TYPE_ISOCHRONOUS, /* bmAttributes */ AUDIO_PACKET_SZE(USBD_AUDIO_FREQ), /* wMaxPacketSize in Bytes (Freq(Samples)*2(Stereo)*2(HalfWord)) */ 0x01, /* bInterval */ 0x00, /* bRefresh */ 0x00, /* bSynchAddress */ /* 09 byte*/ /* Endpoint - Audio Streaming Descriptor*/ AUDIO_STREAMING_ENDPOINT_DESC_SIZE, /* bLength */
