Hi, # Environment: OS = Ubuntu 22.04 LTS (Linux version 5.19.0-41-generic) Program Language = C Language # Overview: We plug in our UVC camera to PC, and try to use `UVCIOC_CTRL_MAP` function on PC to create the v4l2 control mapping, but we got error `UVCIOC_CTRL_MAP: Inappropriate ioctl for device` Development with `C language` in `Ubuntu 22.04 LTS` # Description: We have a custom UVC camera and we can modify the extension unit(XU) by ourself. (USB descriptions reference attachments `uvc_xu_descriptor.PNG` & `usb_decriptions.txt`) We make sure that UVCIOC_CTRL_QUERY is work to control our XU item (demo code in attachment `uvc_xu_ioctl_demo.c`) but UVCIOC_CTRL_MAP function fail with error message `UVCIOC_CTRL_MAP: Inappropriate ioctl for device` (demo code in attachment `uvc_xu_v4l_mapping_demo.c`) # Problems: 1. Is UVCIOC_CTRL_MAP function using in the PC host? 2. Can you found any syntax problem in our demo code `uvc_xu_v4l_mapping_demo.c`? 3. Is there any sample code about struct `uvc_xu_control_mapping` using? Looking forward to your reply, Best Regards, Hardy#2374 *****CONFIDENTIAL INFORMATION***** This email is intended only for the use of the person or entity to whom it is addressed and contains information that may be subject to and/or may be restricted from disclosure by contract or applicable law. If you are not the intended recipient of this email, be advised that any disclosure, copy, distribution or use of the contents of this message is strictly prohibited. If you are not the intended recipient of this email, please notify the sender that you have received this in error by replying to this message. Then, please delete it from your system. Our Privacy Policy is available here https://www.msi.com/page/privacy-policy. Thank you.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/usb/video.h>
#include <linux/uvcvideo.h>
#include <linux/videodev2.h>
#define XU_QUERY_SIZE 0x3C
char originStr[XU_QUERY_SIZE];
char modifyStr[XU_QUERY_SIZE] = "Test123";
bool getUVC_XU_DemoString(char* buf, int size);
bool setUVC_XU_DemoString(char* buf, int size);
int main(int argc, char **argv)
{
if(getUVC_XU_DemoString(originStr, XU_QUERY_SIZE)){
printf("XU GET: %s\n", originStr);
}
if(setUVC_XU_DemoString(modifyStr, XU_QUERY_SIZE)){
printf("XU SET: %s\n", modifyStr);
}
if(getUVC_XU_DemoString(modifyStr, XU_QUERY_SIZE)){
printf("XU GET: %s\n", modifyStr);
}
if(setUVC_XU_DemoString(originStr, XU_QUERY_SIZE)){
printf("XU SET: %s\n", originStr);
}
return 0;
}
bool getUVC_XU_DemoString(char* buf, int size){
int fd = open("/dev/video0", O_RDWR);
bool result = true;
if(fd < 0) {
perror("File Open Fail");
result = false;
goto ret;
}
if(size < XU_QUERY_SIZE){
perror("Invalid buffer size");
result = false;
goto ret;
}
struct uvc_xu_control_query query = {
.query = UVC_GET_CUR,
.unit = 0x4,
.selector = 0x01,
.size = XU_QUERY_SIZE,
.data = (unsigned char*)malloc(XU_QUERY_SIZE),
};
if (ioctl(fd, UVCIOC_CTRL_QUERY, &query) < 0) {
perror("UVCIOC_CTRL_QUERY");
result = false;
goto ret;
}
memcpy(buf, query.data, query.size);
free(query.data);
ret:
close(fd);
return result;
}
bool setUVC_XU_DemoString(char* buf, int size){
int fd = open("/dev/video0", O_RDWR);
bool result = true;
if(fd < 0) {
perror("File Open Fail");
result = false;
goto ret;
}
if(size > XU_QUERY_SIZE){
perror("Invalid buffer size");
result = false;
goto ret;
}
struct uvc_xu_control_query query = {
.query = UVC_SET_CUR,
.unit = 0x4,
.selector = 0x01,
.size = XU_QUERY_SIZE,
.data = (unsigned char*)malloc(XU_QUERY_SIZE),
};
memcpy(query.data, buf, size);
if (ioctl(fd, UVCIOC_CTRL_QUERY, &query) < 0) {
perror("UVCIOC_CTRL_QUERY");
result = false;
goto ret;
}
free(query.data);
ret:
close(fd);
return result;
}#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/usb/video.h>
#include <linux/uvcvideo.h>
#include <linux/videodev2.h>
int main(){
int result;
int fd = open("/dev/video0", O_RDWR);
if(fd < 0) {
perror("File Open Fail");
goto close;
}
struct uvc_xu_control_mapping mapping = {
.id = 0x01,
.name = "My Extension Unit",
.entity = {0x10, 0xbc, 0x46, 0xba, 0x28, 0x5a, 0x4d, 0x7b, 0x97, 0x0e, 0xfd, 0x91, 0x46, 0xa5, 0x2f, 0x2d},
.selector = 0x01,
.size = 0x3C,
.offset = 0x00,
.v4l2_type = V4L2_CTRL_TYPE_STRING,
.data_type = UVC_CTRL_DATA_TYPE_RAW,
.menu_info = NULL,
.menu_count = 0,
.reserved = {0},
};
result = ioctl(fd, _IOWR('u', 0x20, struct uvc_xu_control_mapping), &mapping);
if (result != 0) {
perror("UVCIOC_CTRL_MAP");
goto close;
}
close:
close(fd);
return 0;
}Bus 001 Device 002: ID 2245:1230 Aspeed Technology, Inc. Cupola360 Camera
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.10
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x2245 Aspeed Technology, Inc.
idProduct 0x1230
bcdDevice 1.00
iManufacturer 1 ASPEED Technology Inc.
iProduct 2 Cupola360 Camera
iSerial 3 123456
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x02b8
bNumInterfaces 8
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 14 Video
bFunctionSubClass 3 Video Interface Collection
bFunctionProtocol 0
iFunction 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 1 Video Control
bInterfaceProtocol 0
iInterface 0
VideoControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdUVC 1.00
wTotalLength 0x006d
dwClockFrequency 1.000000MHz
bInCollection 1
baInterfaceNr( 0) 1
VideoControl Interface Descriptor:
bLength 18
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0201 Camera Sensor
bAssocTerminal 0
iTerminal 0
wObjectiveFocalLengthMin 0
wObjectiveFocalLengthMax 0
wOcularFocalLength 0
bControlSize 3
bmControls 0x00000a0e
Auto-Exposure Mode
Auto-Exposure Priority
Exposure Time (Absolute)
Zoom (Absolute)
PanTilt (Absolute)
VideoControl Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 5 (PROCESSING_UNIT)
Warning: Descriptor too short
bUnitID 2
bSourceID 1
wMaxMultiplier 16384
bControlSize 2
bmControls 0x0000157b
Brightness
Contrast
Saturation
Sharpness
Gamma
White Balance Temperature
Backlight Compensation
Power Line Frequency
White Balance Temperature, Auto
iProcessing 0
bmVideoStandards 0x1d
None
PAL - 625/50
SECAM - 625/50
NTSC - 625/50
VideoControl Interface Descriptor:
bLength 29
bDescriptorType 36
bDescriptorSubtype 6 (EXTENSION_UNIT)
bUnitID 3
guidExtensionCode {c11e4cc3-68f9-4b92-aca4-2d73c4d49348}
bNumControls 32
bNrInPins 1
baSourceID( 0) 2
bControlSize 4
bmControls( 0) 0x01
bmControls( 1) 0x00
bmControls( 2) 0x00
bmControls( 3) 0x00
iExtension 0
VideoControl Interface Descriptor:
bLength 29
bDescriptorType 36
bDescriptorSubtype 6 (EXTENSION_UNIT)
bUnitID 4
guidExtensionCode {10bc46ba-285a-4d7b-970e-fd9146a52f2d}
bNumControls 32
bNrInPins 1
baSourceID( 0) 3
bControlSize 4
bmControls( 0) 0x01
bmControls( 1) 0x00
bmControls( 2) 0x00
bmControls( 3) 0x00
iExtension 0
VideoControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 6
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 4
iTerminal 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 8
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 14 Video
bInterfaceSubClass 2 Video Streaming
bInterfaceProtocol 0
iInterface 0
VideoStreaming Interface Descriptor:
bLength 15
bDescriptorType 36
bDescriptorSubtype 1 (INPUT_HEADER)
bNumFormats 2
wTotalLength 0x0107
bEndpointAddress 0x81 EP 1 IN
bmInfo 0
bTerminalLink 6
bStillCaptureMethod 0
bTriggerSupport 0
bTriggerUsage 0
bControlSize 1
bmaControls( 0) 0
bmaControls( 1) 0
VideoStreaming Interface Descriptor:
bLength 27
bDescriptorType 36
bDescriptorSubtype 4 (FORMAT_UNCOMPRESSED)
bFormatIndex 1
bNumFrameDescriptors 1
guidFormat {32595559-0000-0010-8000-00aa00389b71}
bBitsPerPixel 16
bDefaultFrameIndex 1
bAspectRatioX 0
bAspectRatioY 0
bmInterlaceFlags 0x00
Interlaced stream or variable: No
Fields per frame: 2 fields
Field 1 first: No
Field pattern: Field 1 only
bCopyProtect 0
VideoStreaming Interface Descriptor:
bLength 34
bDescriptorType 36
bDescriptorSubtype 5 (FRAME_UNCOMPRESSED)
bFrameIndex 1
bmCapabilities 0x00
Still image unsupported
wWidth 640
wHeight 360
dwMinBitRate 55296000
dwMaxBitRate 110592000
dwMaxVideoFrameBufferSize 460800
dwDefaultFrameInterval 333333
bFrameIntervalType 2
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 666666
VideoStreaming Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 6 (FORMAT_MJPEG)
bFormatIndex 2
bNumFrameDescriptors 5
bFlags 0
Fixed-size samples: No
bDefaultFrameIndex 1
bAspectRatioX 0
bAspectRatioY 0
bmInterlaceFlags 0x00
Interlaced stream or variable: No
Fields per frame: 1 fields
Field 1 first: No
Field pattern: Field 1 only
bCopyProtect 0
VideoStreaming Interface Descriptor:
bLength 34
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 1
bmCapabilities 0x00
Still image unsupported
wWidth 1920
wHeight 1080
dwMinBitRate 248832000
dwMaxBitRate 497664000
dwMaxVideoFrameBufferSize 2073600
dwDefaultFrameInterval 333333
bFrameIntervalType 2
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 666666
VideoStreaming Interface Descriptor:
bLength 34
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 2
bmCapabilities 0x00
Still image unsupported
wWidth 1280
wHeight 720
dwMinBitRate 110592000
dwMaxBitRate 221184000
dwMaxVideoFrameBufferSize 921600
dwDefaultFrameInterval 333333
bFrameIntervalType 2
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 666666
VideoStreaming Interface Descriptor:
bLength 34
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 3
bmCapabilities 0x00
Still image unsupported
wWidth 3840
wHeight 1712
dwMinBitRate 788889600
dwMaxBitRate 1577779200
dwMaxVideoFrameBufferSize 6574080
dwDefaultFrameInterval 333333
bFrameIntervalType 2
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 666666
VideoStreaming Interface Descriptor:
bLength 34
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 4
bmCapabilities 0x00
Still image unsupported
wWidth 2560
wHeight 1136
dwMinBitRate 348979200
dwMaxBitRate 697958400
dwMaxVideoFrameBufferSize 2908160
dwDefaultFrameInterval 333333
bFrameIntervalType 2
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 666666
VideoStreaming Interface Descriptor:
bLength 34
bDescriptorType 36
bDescriptorSubtype 7 (FRAME_MJPEG)
bFrameIndex 5
bmCapabilities 0x00
Still image unsupported
wWidth 2560
wHeight 1440
dwMinBitRate 442368000
dwMaxBitRate 884736000
dwMaxVideoFrameBufferSize 3686400
dwDefaultFrameInterval 333333
bFrameIntervalType 2
dwFrameInterval( 0) 333333
dwFrameInterval( 1) 666666
VideoStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 13 (COLORFORMAT)
bColorPrimaries 1 (BT.709,sRGB)
bTransferCharacteristics 1 (BT.709)
bMatrixCoefficients 4 (SMPTE 170M (BT.601))
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 2
bInterfaceCount 3
bFunctionClass 1 Audio
bFunctionSubClass 0
bFunctionProtocol 0
iFunction 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
bInterfaceProtocol 0
iInterface 9 Cupola360 Audio
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 1.00
wTotalLength 0x003e
bInCollection 2
baInterfaceNr(0) 3
baInterfaceNr(1) 4
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bNrChannels 2
wChannelConfig 0x0000
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 10
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 2
bSourceID 1
bControlSize 1
bmaControls(0) 0x03
Mute Control
Volume Control
bmaControls(1) 0x00
bmaControls(2) 0x00
iFeature 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 3
wTerminalType 0x0301 Speaker
bAssocTerminal 0
bSourceID 2
iTerminal 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 17
wTerminalType 0x0201 Microphone
bAssocTerminal 0
bNrChannels 1
wChannelConfig 0x0000
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 19
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 17
iTerminal 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 4 Speaker
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 4 Speaker
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 1 frames
wFormatTag 0x0001 PCM
AudioStreaming Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 2
bBitResolution 16
bSamFreqType 1 Discrete
tSamFreq[ 0] 48000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x00c0 1x 192 bytes
bInterval 4
bRefresh 0
bSynchAddress 0
AudioStreaming Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 1 Milliseconds
wLockDelay 0x0001
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 4
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 5 Microphone
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 4
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 5 Microphone
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 19
bDelay 1 frames
wFormatTag 0x0001 PCM
AudioStreaming Interface Descriptor:
bLength 11
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 1
bSubframeSize 2
bBitResolution 16
bSamFreqType 1 Discrete
tSamFreq[ 0] 16000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x86 EP 6 IN
bmAttributes 5
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Data
wMaxPacketSize 0x0024 1x 36 bytes
bInterval 4
bRefresh 0
bSynchAddress 0
AudioStreaming Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 0 Undefined
wLockDelay 0x0001
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 5
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 8 AstStream
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 6
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 7 HidExtension
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 38
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x89 EP 9 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 1
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 7
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 11 HidCustom
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.11
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 38
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 4
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 4
Binary Object Store Descriptor:
bLength 5
bDescriptorType 15
wTotalLength 0x0032
bNumDeviceCaps 3
Platform Device Capability:
bLength 28
bDescriptorType 16
bDevCapabilityType 5
bReserved 0
PlatformCapabilityUUID {d8dd60df-4589-4cc7-9cd2-659d9e648a9f}
CapabilityData[0] 0x00
CapabilityData[1] 0x00
CapabilityData[2] 0x03
CapabilityData[3] 0x06
CapabilityData[4] 0xb2
CapabilityData[5] 0x00
CapabilityData[6] 0x01
CapabilityData[7] 0x00
USB 2.0 Extension Device Capability:
bLength 7
bDescriptorType 16
bDevCapabilityType 2
bmAttributes 0x0000050e
BESL Link Power Management (LPM) Supported
BESL value 1280 us
SuperSpeed USB Device Capability:
bLength 10
bDescriptorType 16
bDevCapabilityType 3
bmAttributes 0x00
wSpeedsSupported 0x000c
Device can operate at High Speed (480Mbps)
Device can operate at SuperSpeed (5Gbps)
bFunctionalitySupport 2
Lowest fully-functional device speed is High Speed (480Mbps)
bU1DevExitLat 10 micro seconds
bU2DevExitLat 511 micro seconds
Device Status: 0x0000
(Bus Powered)Attachment:
uvc_xu_descriptor.PNG
Description: uvc_xu_descriptor.PNG
