近期开发USB Composite Device 撰写的USB 描述符 ,支持 USB speaker + USB Mic，同时支持USB HID 自定义设备。可以作为
开发设备的参考。（此描述符已经经过实战验证，支持WINDOWS)
AUDIO支持：48KHZ,16BIT,MONO 录放 (2个 ISO endpoints)
HID支持： 8字节 双向（2 interrupt endpoints)

uint8_t g_device_descriptor[DEVICE_DESCRIPTOR_SIZE] =
{
DEVICE_DESCRIPTOR_SIZE, /* (18) “Device Descriptor Size */
USB_DEVICE_DESCRIPTOR, /* “Device” Type of descriptor */
0x10,0x01, /* BCD USB version */
0x00, /* Device Class is indicated in
the interface descriptors */
0x00, /* Device Subclass is indicated
in the interface descriptors */
0x00, /* Device Protocol */
CONTROL_MAX_PACKET_SIZE, /* Max Packet size */
0xa2, 0x15, /* Vendor ID */
0x00, 0x03, /* Product ID */
0x00, 0x02, /* BCD Device version */
0x01, /* Manufacturer string index */
0x02, /* Product string index */
0x00, /* Serial number string index */
0x01 /* Number of configurations */
};

/* 1个 AUDIO CONTROL接口(SPEAKER和MICROPHONE的控制)
2个 AUDIO STREAMING接口
1 个SPEAKER ( 1 channels 16bit 48khz, 96bytes)
1 个MICROPHONE ( 1 channel 16bit 48khz, 96bytes )
1个HID 接口
device host
microphone : IT -> FU -> OT USB IN-ENDPOINT
speaker : OT <- FU <- IT USB OUT-ENDPOINT

config :
config header

   audio control interface 0audio control headeraudio microphone control ITaudio microphone control FUaudio microphone control OTaudio speaker control OTaudio speaker control FUaudio speaker control ITaudio microphone interfaceaudio microphone endpointaudio speaker interfaceaudio speaker endpoint

*/

uint8_t g_config_descriptor[CONFIG_DESC_SIZE] =
{
CONFIG_ONLY_DESC_SIZE, /* Configuration Descriptor Size ( 9 )bytes*/
USB_CONFIG_DESCRIPTOR, /* “Configuration” type of descriptor */
// CONFIG_DESC_SIZE :注意大小需要计算
CONFIG_DESC_SIZE, 0x00, /* Total length of the Configuration descriptor (191 + 25 +7)*/
// 接口的个数要更改： 3(2个AUDIO+1个HID) -> 4 (3个AUDIO+1个HID）
0x04, /* NumInterfaces */
0x01, /* Configuration Value */
0, /* Configuration Description String Index*/
/* Attributes.support RemoteWakeup and self power */
(USB_DESC_CFG_ATTRIBUTES_D7_POS) | (USBCFG_DEV_SELF_POWER << USB_DESC_CFG_ATTRIBUTES_SELF_POWERED_SHIFT) | (USBCFG_DEV_REMOTE_WAKEUP << USB_DESC_CFG_ATTRIBUTES_REMOTE_WAKEUP_SHIFT),
/* S08/CFv1 are both self powered (its compulsory to set bus powered)*/
/Attributes.support RemoteWakeup and self power/
0xFA, /* Current draw from bus */

/********** Audio Control interface 0 :不定义端点，使用EP0************************/
/* AUDIO CONTROL INTERFACE DISCRIPTOR */
IFACE_ONLY_DESC_SIZE, /(9) Size of this descriptor/
USB_IFACE_DESCRIPTOR, /INTERFACE descriptor /
0x00, /* interface number = 0*/
0x00, /Index of this setting/
0x00, /0 endpoint (control端点使用EP0)/
USB_DEVICE_CLASS_AUDIO, /AUDIO/
USB_SUBCLASS_AUDIOCONTROL, /AUDIO_CONTROL/
0x00, /Unused/
0x00, /* Unused*/

//class-specific AC interface descriptor,audio interface(0x24),audio control header(0x01),
//Total Length 0x0048,Number of streaming interface 2,interfaceNr 1,1
/* Audio class-specific interface header */
EX_HEADER_ONLY_DESC_SIZE, /* bLength (10) */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType (CS_INTERFACE) */
AUDIO_CONTROL_HEADER, /* bDescriptorSubtype (HEADER) */
0x00,0x01, /* bcdADC (1.0) */
// HEADER SIZE 要重新计算
0x45,0x00, /* wTotalLength (69) */
0x02, /* bInCollection :2 AudioStreaming interface*/ //lzq:0->2
0x02, /* 编号2 ：InterfaceNr(2) - AS #1 id AudioStreaming interface 2 belongs to this AudioControl interface */
0x01, /* 编号1 ：InterfaceNr(1) - AS #2 id AudioStreaming interface 1 belongs to this AudioControl interface */

/* Audio microphone control unit */
//Microphone(0x0201),Input Terminal,1 channel
/* Audio class-specific input terminal */
INPUT_TERMINAL_ONLY_DESC_SIZE, /* bLength (12) */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType (CS_INTERFACE) */
AUDIO_CONTROL_INPUT_TERMINAL, /* bDescriptorSubtype (INPUT_TERMINAL) */
0x01, /* bTerminalID (1) */
0x01,0x02, /* wTerminalType ( microphone) */
0x00, /* bAssocTerminal (none) */
//channel 个数
0x01, /* bNrChannels (1) */
0x00,0x00, /* wChannelConfig (left, right) */
0x00, /* iChannelNames (none) */
0x00, /* iTerminal (none) */

//Audio Feature Unit Descriptor:audio interface descriptor,feature_unit(0x06),terminal id 0x02,
//SourceId 0x01,ControlSize 0x01,Mute,Volume,
/* Audio class-specific feature unit */
//注意：由于INPUT 为单声道录音，所以这个地方FEATURE_UNIT_ONLY_DESC_SIZE=9，如果是双声道录音则FEATURE_UNIT_ONLY_DESC_SIZE=10
FEATURE_UNIT_ONLY_DESC_SIZE, /* bLength (9) */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType (CS_INTERFACE) */
AUDIO_CONTROL_FEATURE_UNIT, /* bDescriptorSubtype (FEATURE_UNIT) */
0x02, /* bUnitID (2) */
0x01, /* bSourceID (input terminal 1 ： bTerminalID 1 #Microphone IT) */
0x01, /* bControlSize (1 bytes) */
0x03, // CONTROL :MUTE
0x00, /* Master controls ：volume*/
0x00, /* Channel 0 controls */

/* Audio class-specific output terminal */
//USB Streaming OT:audio interface descriptor,audio control output terminal(0x03),terminal id 0x03,
//USB Streaming(0x0101),Output Terminal(0x03),SourceId 0x02,

OUTPUT_TERMINAL_ONLY_DESC_SIZE, /* bLength (9)*/
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType (CS_INTERFACE) */
AUDIO_CONTROL_OUTPUT_TERMINAL, /* bDescriptorSubtype (OUTPUT_TERMINAL)*/
0x03, /* bTerminalID (3) */
0x01,0x01, /* wTerminalType (USB streaming) */
0x00, /* bAssocTerminal (none) */
0x02, /* bSourceID (feature unit 2) */
0x00, /* iTerminal (none)*/

/* Audio speaker control unit */
//streaming (0x0101),Input Terminal(0x02),1 channel
INPUT_TERMINAL_ONLY_DESC_SIZE, /* bLength (12) */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType (CS_INTERFACE) */
AUDIO_CONTROL_INPUT_TERMINAL, /* bDescriptorSubtype (INPUT_TERMINAL) */
0x04, /* bTerminalID (4) */
0x01,0x01, /* wTerminalType (USB Streaming) */
0x00, /* bAssocTerminal (none) */
0x01, /* bNrChannels (2) */ //only one channel: 2->1
0x00,0x00, /* wChannelConfig (left, right) */
0x00, /* iChannelNames (none) */
0x00, /* iTerminal (none) */

/* Audio class-specific feature unit */
//Audio Feature Unit Descriptor:audio interface descriptor,feature_unit,terminal id 0x05,
//SourceId 0x01,ControlSize 0x01,Mute,Volume,
//FU 和IT关联，如果是1个CHANNEL ：FEATURE_UNIT2_ONLY_DESC_SIZE是9；如果是2个CHN，那么FEATURE_UNIT2_ONLY_DESC_SIZE=10
FEATURE_UNIT_ONLY_DESC_SIZE, /* bLength (9) */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType (CS_INTERFACE) */
AUDIO_CONTROL_FEATURE_UNIT, /* bDescriptorSubtype (FEATURE_UNIT) */
0x05, /* bTerminalID (5) */
0x04, /* bSourceID (input terminal 4) */
0x01, /* bControlSize (1 bytes) */
0x03, // controls:mute
0x02, /* controls:volume(0) */
0x00, /* Feature String */

/* Audio class-specific output terminal */
//USB Speaker OT:audio interface descriptor,audio control output terminal(0x03),terminal id 0x06,
//USB Speaker(0x0301),Output Terminal(0x03),SourceId 0x05,
OUTPUT_TERMINAL_ONLY_DESC_SIZE, /* bLength (9)*/
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType (CS_INTERFACE) */
AUDIO_CONTROL_OUTPUT_TERMINAL, /* bDescriptorSubtype (OUTPUT_TERMINAL)*/
0x06, /* bTerminalID (6) */
0x01,0x03, /* wTerminalType (USB speaker) */
0x00, /* bAssocTerminal (none) */
0x05, /* bSourceID (feature unit 5) */
0x00, /* iTerminal (none)*/

//——————-Microphone streaming interface 1———————//
/* USB microphone standard AS interface descriptor - audio streaming operational
(Interface 1, Alternate Setting 0) */
IFACE_ONLY_DESC_SIZE, /* bLength (9)*/
USB_IFACE_DESCRIPTOR, /* bDescriptorType (CS_INTERFACE) */
0x01, /* interface Number: 1 */
0x00, /* Alternate Setting: 0 */
0x00, /* not used (Zero Bandwidth) */
USB_DEVICE_CLASS_AUDIO, /* USB DEVICE CLASS AUDIO */
USB_SUBCLASS_AUDIOSTREAM, /* AUDIO SUBCLASS AUDIOSTREAMING */
0x00, /* AUDIO PROTOCOL UNDEFINED */
0x00, /* Unused */

/* USB microphone standard AS interface descriptor - audio streaming operational

(Interface 1, Alternate Setting 1) */
IFACE_ONLY_DESC_SIZE, /* bLength (9) */
USB_IFACE_DESCRIPTOR, /* bDescriptorType (CS_INTERFACE) */
0x01, /* interface Number: 1 */
0x01, /* Alternate Setting: 1 */
0x01, /* One Endpoint. */
USB_DEVICE_CLASS_AUDIO, /* USB DEVICE CLASS AUDIO */
USB_SUBCLASS_AUDIOSTREAM, /* AUDIO SUBCLASS AUDIOSTREAMING */
0x00, /* AUDIO PROTOCOL UNDEFINED */
0x00, /* Unused */

/* USB microphone standard General AS interface descriptor */

AUDIO_STREAMING_IFACE_DESC_SIZE, /* bLength (7) */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType (CS_INTERFACE) */
AUDIO_STREAMING_GENERAL, /* GENERAL subtype */
0x03, /* Unit ID of microphone output terminal : terminal ID = 3 */
0x00, /* Interface delay */
0x01,0x00, /* PCM format */ // 02,01 –> 01,00

/* USB microphone audio type I format interface descriptor */

AUDIO_STREAMING_TYPE_I_DESC_SIZE,/* bLength (11) */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType (CS_INTERFACE) */
AUDIO_STREAMING_FORMAT_TYPE, /* DescriptorSubtype: AUDIO STREAMING FORMAT TYPE */
AUDIO_FORMAT_TYPE_I, /* Format Type: Type I */
AUDIO_FORMAT_CHANNELS, /* Number of Channels: one channel */
AUDIO_FORMAT_SIZE, /* SubFrame Size: one byte per audio subframe */
AUDIO_FORMAT_BITS, /* Bit Resolution: 8 bits per sample */
0x01, /* One frequency supported */
// 0x40, 0x1F,0x00, /* 8 kHz */
// 0x80, 0x3E,0x00, /* 16 kHz */
0x80,0xBB,0x00, /* 48 kHz */
// 0x00, 0xFA,0x00, /* 72 kHz */

/Endpoint 1 - standard descriptor/
ENDP_ONLY_DESC_SIZE, /* bLength (9) */
USB_ENDPOINT_DESCRIPTOR, /* Descriptor type (endpoint descriptor) */
AUDIO_MIC_ENDPOINT|(USB_SEND << 7), /* OUT endpoint address = 1 */ //endpoint address must be set
0x05, /* Isochronous endpoint */ //lzq 1->5
USB_uint_16_low(FS_ISO_OUT_ENDP_PACKET_SIZE),
USB_uint_16_high(FS_ISO_OUT_ENDP_PACKET_SIZE), /* 16 bytes */
FS_ISO_OUT_ENDP_INTERVAL, /* 1 ms */
0x00, /* Unused */
0x00, /* Unused */

/* Endpoint 1 - Audio streaming descriptor */
AUDIO_STREAMING_ENDP_DESC_SIZE, /* bLength (7) */
USB_AUDIO_DESCRIPTOR, /* AUDIO ENDPOINT DESCRIPTOR TYPE */
AUDIO_ENDPOINT_GENERAL, /* AUDIO ENDPOINT GENERAL */
0x00, /* bmAttributes: 0x00 */
0x00, /* unused */
0x00,0x00, /* unused */

//——————-Speaker streaming interface 2———————//
/* USB speaker standard AS interface descriptor - audio streaming operational
(Interface 2, Alternate Setting 0) */
IFACE_ONLY_DESC_SIZE, /* bLength (9) */
USB_IFACE_DESCRIPTOR, /* bDescriptorType (CS_INTERFACE) */
0x02, /* interface Number: 2 */
0x00, /* Alternate Setting: 0 */
0x00, /* not used (Zero Bandwidth) */
USB_DEVICE_CLASS_AUDIO, /* USB DEVICE CLASS AUDIO */
USB_SUBCLASS_AUDIOSTREAM, /* AUDIO SUBCLASS AUDIOSTREAMING */
0x00, /* AUDIO PROTOCOL UNDEFINED */
0x00, /* Unused */

 /* USB speaker standard AS interface descriptor - audio streaming operational

(Interface 2, Alternate Setting 1) */
IFACE_ONLY_DESC_SIZE, /* bLength (9) */
USB_IFACE_DESCRIPTOR, /* bDescriptorType (CS_INTERFACE) */
0x02, /* interface Number: 1 */
0x01, /* Alternate Setting: 1 */
0x01, /* One Endpoint. */
USB_DEVICE_CLASS_AUDIO, /* USB DEVICE CLASS AUDIO */
USB_SUBCLASS_AUDIOSTREAM, /* AUDIO SUBCLASS AUDIOSTREAMING */
0x00, /* AUDIO PROTOCOL UNDEFINED */
0x00, /* Unused */

 /* USB speaker standard General AS interface descriptor */
AUDIO_STREAMING_IFACE_DESC_SIZE, /* bLength (7) */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType (CS_INTERFACE) */
AUDIO_STREAMING_GENERAL,         /* GENERAL subtype */
0x04,                            /* Unit ID of USB Streaming IT   */
0x01,                            /* Interface delay */
0x01,0x00,                       /* PCM format *//* USB speaker audio type I format interface descriptor */
AUDIO_STREAMING_TYPE_I_DESC_SIZE,   /* bLength (11) */
AUDIO_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType (CS_INTERFACE) */
AUDIO_STREAMING_FORMAT_TYPE,     /* DescriptorSubtype: AUDIO STREAMING FORMAT TYPE */
AUDIO_FORMAT_TYPE_I,             /* Format Type: Type I */
AUDIO_FORMAT_CHANNELS,           /* Number of Channels: one channel */
AUDIO_FORMAT_SIZE,               /* SubFrame Size: one byte per audio subframe */
AUDIO_FORMAT_BITS,               /* Bit Resolution: 8 bits per sample */
0x01,                            /* One frequency supported */

// 0x40, 0x1F,0x00, /* 8 kHz */
// 0x80, 0x3E,0x00, /* 16 kHz */
0x80,0xBB,0x00, /* 48 kHz */
// 0x00, 0xFA,0x00, /* 72 kHz */

/*Endpoint 1 - standard descriptor*/
ENDP_ONLY_DESC_SIZE,             /* bLength (9) */
USB_ENDPOINT_DESCRIPTOR,         /* Descriptor type (endpoint descriptor) */
AUDIO_SPK_ENDPOINT,              /* OUT endpoint address 2 */       //输出的ENDPOINT = 2
0x05,                            /* Isochronous endpoint */  //lzq 1->5
USB_uint_16_low(FS_ISO_OUT_ENDP_PACKET_SIZE),
USB_uint_16_high(FS_ISO_OUT_ENDP_PACKET_SIZE),  /* size of packet: 64 Bytes */

#if HIGH_SPEED
HS_ISO_OUT_ENDP_INTERVAL, /* bInterval(0x04): 2^x ms */
#else
FS_ISO_OUT_ENDP_INTERVAL, /* bInterval(0x01): 2^x ms */
#endif
0x00, /* Unused */
0x00, /* Unused */

/* Endpoint 1 - Audio streaming descriptor */
AUDIO_STREAMING_ENDP_DESC_SIZE,  /* bLength (7) */
USB_AUDIO_DESCRIPTOR,            /* AUDIO ENDPOINT DESCRIPTOR TYPE */
AUDIO_ENDPOINT_GENERAL,          /* AUDIO ENDPOINT GENERAL */
0x00,                            /* bmAttributes: 0x80 */
0x00,                            /* unused */
0x00,0x00,                       /* unused *///AUDIO DESCRIPTOR TOTAL :191 BYTES

//——————-HID interface 3———————//
/* HID specific Interface Descriptor */
IFACE_ONLY_DESC_SIZE, //(9)
USB_IFACE_DESCRIPTOR, ///* bDescriptorType (CS_INTERFACE) */
0x03, // interface number
0x00, /* Alternate Setting: 0 */
HID_DESC_ENDPOINT_COUNT,
0x03, /* USB DEVICE class : HID */
0x00, /* USB SUBCLASS :注意：非 boot device*/
0x00, //接口所遵循的协议 0-NONE 1-KEYBOARD 2-MOUSE 3-255:RSV 2->0xFF(VENDOR DEFINED)
0x00, //描述该接口的字符串索引值

  /* HID descriptor */HID_ONLY_DESC_SIZE,               //(9)USB_HID_DESCRIPTOR,0x10,0x01,                        //bcd0x00,0x01,0x22,                             //report descriptor support0x23,0x00,                        //size of(report descriptor)/*Endpoint descriptor */0x07,                             //(7)USB_ENDPOINT_DESCRIPTOR,HID_IN_ENDPOINT|(USB_SEND << 7),      //:endpoint numberUSB_INTERRUPT_PIPE,USB_uint_16_low(FS_INTERRUPT_OUT_ENDP_PACKET_SIZE),       //8->64 (FS_INTERRUPT_OUT_ENDP_PACKET_SIZE)USB_uint_16_high(FS_INTERRUPT_OUT_ENDP_PACKET_SIZE),FS_INTERRUPT_OUT_ENDP_INTERVAL,/*Endpoint descriptor */0x07,                             //(7)USB_ENDPOINT_DESCRIPTOR,HID_OUT_ENDPOINT,     //endpoint numberUSB_INTERRUPT_PIPE,USB_uint_16_low(FS_INTERRUPT_OUT_ENDP_PACKET_SIZE),       //8->64 (FS_INTERRUPT_OUT_ENDP_PACKET_SIZE)USB_uint_16_high(FS_INTERRUPT_OUT_ENDP_PACKET_SIZE),FS_INTERRUPT_OUT_ENDP_INTERVAL

};

uint8_t g_report_descriptor[35] =
{
0x05,0x81, /usage page(FF00h, vendor defined) /
0x09,0x82, /usage (vendor defined) /
0xA1,0x88, /* collection(Application) */
//输入报告 device –>host
0x09, 0x83, /* usage (vendor defined1) */
0x09, 0x84, /* usage (vendor defined1) */
0x15, 0x00, /* LOGICAL_MINIMUM (0x0 )*/
0x26, 0x00,0xFF, /* LOGICAL_MAXIMUM (0xFF) */
0x75, 0x08, /* Report size (8位) */
0x95, 0x08, /* REPORT_SIZE (64 fields = 8 bytes,include report ID) */
0x81, 0x02, /* INPUT(data, val, absolute)*/
//输出报告 host –> device

    0x09, 0x84,     /*       usage page (vendor defined3)*/0x15, 0x00,     /*       LOGICAL_MINIMUM (0x0 )*/0x26, 0x00,0xFF, /*       LOGICAL_MAXIMUM (0xFF) */0x75, 0x08,     /*       Report size (8位)              */0x95, 0x08,     /*       REPORT_SIZE (64 fields = 8 bytes,include report ID) */0x91, 0x02,     /*       OUTPUT(data, val, absolute) */0xC0            /*   ENDCOLLECTION(Application) */

};

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