PixArt PAC7301/PAC7302: Difference between revisions

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PixArt PAC7301/PAC7302 is a System on a Chip (SoC) with multimedia sensor capabilities. The chip is supported by the gspca_pac7302 kernel module.
PixArt PAC7301/PAC7302 is a System on a Chip (SoC) with multimedia sensor capabilities. The chip is supported by the gspca_pac7302 kernel module.


Line 98: Line 90:
|[http://www.genius-europe.com/en/produktdetail.php?ID2=82&ID=31&ID3=498 Genius iSlim 310]
|[http://www.genius-europe.com/en/produktdetail.php?ID2=82&ID=31&ID3=498 Genius iSlim 310]
|Identified from the [http://www.genius-europe.com/treiber/iSlim310.zip driver] installed with wine-1.1.37
|Identified from the [http://www.genius-europe.com/treiber/iSlim310.zip driver] installed with wine-1.1.37
|-
|0x093a
|0x2627
|[http://www.geniusnet.com/wSite/ct?xItem=47172&ctNode=159 Genius FaceCam 300]
|Identified from the [http://download.geniusnet.com/2010/Webcam/FC300.zip driver] installed with wine-1.0.1. See the installed windows/inf/facecam300.inf .
|-
|-
|}
|}
Line 1,020: Line 1,017:
If you have a kernel version 2.6.32 or before then use gspca_pac7311 instead of gspca_pac7302.
If you have a kernel version 2.6.32 or before then use gspca_pac7311 instead of gspca_pac7302.


The support for snapshot button is available since 28 Jan 2010 in one of the [http://linuxtv.org/hg/~jfrancois/gspca/rev/24ab9e77691d|development repositories]. ''Please update this paragraph if the support is merged to mainline kernel.''
The support for snapshot button is available since 28 Jan 2010 in one of the [http://git.linuxtv.org/jfrancois/gspca.git/commit/aed6f1b5fe4e95cf8a9fc149e25041aa8cc7c78a|development repositories]. The patch was merged as commit [http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=aed6f1b5fe4e95cf8a9fc149e25041aa8cc7c78a aed6f1b5fe4e95cf8a9fc149e25041aa8cc7c78a] to the mailine and it is included in Linux kernel starting with the stable release 2.6.37, released on 4 Jan 2011.


===Sample Kernel Output===
===Sample Kernel Output===
Line 1,041: Line 1,038:
===Remote Control Support===
===Remote Control Support===
Not applicable.
Not applicable.

==Programming reference==
'''Note:''' this chapter is based on the Linux gspca_pac7302 driver and on trial-and error. Use information here on your risk.

The PAC7301/PAC7302 can be controlled through registers. The registers are grouped to pages of 256 registers. The registers can be written by sending an USB control message to the device. The ''value'' parameter of usb_control_msg() is always zero; the ''index'' parameter specifies the offset within a page; the ''data'' and ''length'' parameters specify the register content to be written.

The different register pages can be switched by writing the new page value to offset 255 of any page.

{| cellspacing="0" border="1"
!Register Page
!Register Offset
!Description
!Accessed in function
|-
|0
|0x00..0x0e
|(unknown)
|
|-
|0
|0x0f..0x20
|
|setcolors()
|-
|0
|0x21..0x54
|(unknown)
|
|-
|0
|0x55
|Image filter
|
|-
|0
|0x56..0x6d
|(unknown)
|
|-
|0
|0x6e
|Digital tilt
|
|-
|0
|0x6f
|Digital pan
|
|-
|0
|0x70..0x71
|(unknown)
|
|-
|0
|0x72
|Test pattern and test overlay
|
|-
|0
|0x73..0xa1
|(unknown)
|
|-
|0
|0xa2..0xab
|
|setbrightcont()
|-
|0
|0xac..0xc4
|(unknown)
|
|-
|0
|0xc5
|
|setbrightcont()
|-
|0
|0xc6
|
|setwhitebalance()
|-
|0
|0xc7
|
|setbluebalance()
|-
|0
|0xc8-0xdb
|(unknown)
|
|-
|0
|0xdc
|
|setbrightcont(), setcolors()
|-
|0
|0xdd-0xfe
|(unknown)
|
|-
|0
|0xff
|Select register page
|
|-
|1
|0x00..0x77
|(unknown)
|
|-
|1
|0x78
|Start/stop streaming, LED control
|
|-
|1
|0x79..0xfe
|(unknown)
|
|-
|1
|0xff
|Select register page
|
|-
|3
|0x00..0x01
|(unknown)
|
|-
|3
|0x02
|Exposure
|setexposure()
|-
|3
|0x03..0x0f
|(unknown)
|
|-
|3
|0x10
|Gain
|setgain()
|-
|3
|0x11
|
|setcolors(), setgain(), setexposure(), sethvflip()
|-
|3
|0x12..0x20
|(unknown)
|
|-
|3
|0x21
|Horizontal and vertical flip
|sethvflip()
|-
|3
|0x22..0xfe
|(unknown)
|
|-
|3
|0xff
|Select register page
|
|}

===Image filter===

Register page, offset: 0, 0x55

{| cellspacing="0" border="1" width="100%"
!7
!6
!5
!4
!3
!2
!1
!0
|- align="center"
|?
|?
|?
|?
|?
|EDGE
|?
|?
|- align="center"
|?
|?
|?
|?
|?
|w
|?
|?
|}


{| cellspacing="0" border="1"
!Bits
!Field
!Description
|-
|align="center"|2
|align="center"|EDGE
|Activates edge detection image filter<br>
0: Normal picture<br>
1: Edge detection activated
|}


===Digital tilt===

Register page, offset: 0, 0x6e

{| cellspacing="0" border="1" width="100%"
!7
!6
!5
!4
!3
!2
!1
!0
|- align="center"
|colspan="8"|TILT
|- align="center"
|colspan="8"|w
|}


{| cellspacing="0" border="1"
!Bits
!Field
!Description
|-
|align="center"|7-0
|align="center"|TILT
|Digital tilt
|}

===Digital pan===

Register page, offset: 0, 0x6f

{| cellspacing="0" border="1" width="100%"
!7
!6
!5
!4
!3
!2
!1
!0
|- align="center"
|colspan="8"|PAN
|- align="center"
|colspan="8"|w
|}


{| cellspacing="0" border="1"
!Bits
!Field
!Description
|-
|align="center"|7-0
|align="center"|PAN
|Digital pan
|}

===Test pattern, test overlay===

Register page, offset: 0, 0x72

{| cellspacing="0" border="1" width="100%"
!7
!6
!5
!4
!3
!2
!1
!0
|- align="center"
|?
|?
|?
|TEST_OVERLAY
|colspan="4"|TEST_PATTERN
|- align="center"
|?
|?
|?
|w
|colspan="4"|w
|}


{| cellspacing="0" border="1"
!Bits
!Field
!Description
|-
|align="center"|4
|align="center"|TEST_OVERLAY
|Test overlay<br>
0: normal operation, test overlay generation off<br>
1: test overlay on
|-
|align="center"|3-0
|align="center"|TEST_PATTERN
|Test pattern generation:<br>
0x0: normal operation, test pattern generation off<br>
0x1: generate [http://en.wikipedia.org/wiki/White white] test pattern: the whole image is white<br>
0x2: generate [http://en.wikipedia.org/wiki/Black black] test pattern: the whole image is black<br>
0x3: generate [http://en.wikipedia.org/wiki/Red red] test pattern: the whole image is red<br>
0x4: generate [http://en.wikipedia.org/wiki/Lime_(color) lime] test pattern: the whole image is lime<br>
0x5: generate [http://en.wikipedia.org/wiki/Blue blue] test pattern: the whole image is blue<br>
0x6: generate [http://en.wikipedia.org/wiki/Aqua_(color) aqua] test pattern: the whole image is aqua<br>
0x7: generate [http://en.wikipedia.org/wiki/Fuchsia_(color) fuchsia] test pattern: the whole image is fuchsia<br>
0x8: generate [http://en.wikipedia.org/wiki/Yellow yellow] test pattern: the whole image is yellow<br>
0x9: generate test pattern with colored horizontal and vertical bars<br>
0xA: generate test pattern with small colored pixels all around the image<br>
0xB: generate a gradient test pattern starting from black on the top and bright color on the bottom<br>
0xC: generate a gradient test pattern starting from white on the left towards black on the right<br>
0xD: generate frequent vertical gadient bars white to black, from left to right<br>
0xE: generate [http://en.wikipedia.org/wiki/Black black] test pattern: the whole image is black<br>
0xF: generate [http://en.wikipedia.org/wiki/Black black] test pattern: the whole image is black<br>
|}

These test patterns can be generated when the gspca_pac7302 driver is built with CONFIG_VIDEO_ADV_DEBUG=y. First start streaming e.g. with cheese then execute "v4l2-dbg --set-register=0x72 0x01" for value 0x01. These test patterns were generated using [http://labtec.com/index.cfm/gear/details/EUR/EN,crid=30,contentid=761 Labtec Webcam 2200] hardware.

Value 0x1: generate [http://en.wikipedia.org/wiki/White white] test pattern:
[[File:pac7302_reg0x72_value0x01.jpg|border]]


Value 0x2: generate [http://en.wikipedia.org/wiki/Black black] test pattern:
[[File:pac7302_reg0x72_value0x02.jpg|border]]


Value 0x3: generate [http://en.wikipedia.org/wiki/Red red] test pattern:
[[File:pac7302_reg0x72_value0x03.jpg|border]]


Value 0x4: generate [http://en.wikipedia.org/wiki/Lime_(color) lime] test pattern:
[[File:pac7302_reg0x72_value0x04.jpg|border]]


Value 0x5: generate [http://en.wikipedia.org/wiki/Blue blue] test pattern:
[[File:pac7302_reg0x72_value0x05.jpg|border]]


Value 0x6: generate [http://en.wikipedia.org/wiki/Aqua_(color) aqua] test pattern:
[[File:pac7302_reg0x72_value0x06.jpg|border]]


Value 0x7: generate [http://en.wikipedia.org/wiki/Fuchsia_(color) fuchsia] test pattern:
[[File:pac7302_reg0x72_value0x07.jpg|border]]


Value 0x8: generate [http://en.wikipedia.org/wiki/Yellow yellow] test pattern:
[[File:pac7302_reg0x72_value0x08.jpg|border]]


Value 0x9: generate test pattern with colored horizontal and vertical bars:
[[File:pac7302_reg0x72_value0x09.jpg|border]]


Value 0xA: generate test pattern with small colored pixels all around the image:
[[File:pac7302_reg0x72_value0x0a.jpg|border]]


Value 0xB: generate a gradient test pattern starting from black on the top and bright color on the bottom:
[[File:pac7302_reg0x72_value0x0b.jpg|border]]


Value 0xC: generate a gradient test pattern starting from white on the left towards black on the right:
[[File:pac7302_reg0x72_value0x0c.jpg|border]]


Value 0xD: generate frequent vertical gadient bars white to black, from left to right:
[[File:pac7302_reg0x72_value0x0d.jpg|border]]


Value 0x13: generate [http://en.wikipedia.org/wiki/Red red] test pattern with test overlay on:
[[File:pac7302_reg0x72_value0x13.jpg|border]]

===Streaming on/off, LED control===

Register page, offset: 1, 0x78

{| cellspacing="0" border="1" width="100%"
!7
!6
!5
!4
!3
!2
!1
!0
|- align="center"
|?
|nLED
|?
|?
|?
|?
|?
|STREAMING
|- align="center"
|?
|w
|?
|?
|?
|?
|?
|w
|}


{| cellspacing="0" border="1"
!Bits
!Field
!Description
|-
|align="center"|6
|align="center"|nLED
|Controls the feedback LED.<br>
0: LED active<br>
1: LED off
|-
|align="center"|0
|align="center"|STREAMING
|Controls the video stream from the webcam.<br>
0: steram is off<br>
1: stream is on
|}

===Horizontal and vertical flip===

Register page, offset: 3, 0x21

{| cellspacing="0" border="1" width="100%"
!7
!6
!5
!4
!3
!2
!1
!0
|- align="center"
|?
|?
|?
|?
|HFLIP
|VFLIP
|?
|?
|- align="center"
|?
|?
|?
|?
|w
|w
|?
|?
|}


{| cellspacing="0" border="1"
!Bits
!Field
!Description
|-
|align="center"|3
|align="center"|HFLIP
|Activate horizontal flip of the image<br>
0: Horizontal flip not active<br>
1: Horizontal flip active
|-
|align="center"|2
|align="center"|VFLIP
|Activate vertical flip of the image<br>
0: Vertical flip is not active<br>
1: Vertical flip is active
|}


==External Links==
==External Links==
* [http://www.pixart.com.tw/upload/PAC7301_7302%20%20Spec%20V1_20091228174030.pdf PixArt PAC7301/PAC7302 datasheet]
* [http://www.pixart.com.tw/upload/PAC7301_7302%20%20Spec%20V1_20091228174030.pdf PixArt PAC7301/PAC7302 datasheet] ([http://www.pixart.com.tw/upload/PAC7301_7302%20Spec%20V1_20100319092957.pdf alternative link])
* [http://www.pixart.com.tw/ PixArt Imaging Inc.] -> Product Search -> PC-Cam SoC -> VGA
* [http://www.pixart.com.tw/ PixArt Imaging Inc.] -> Product Search -> PC-Cam SoC -> VGA
* [http://labtec.com/index.cfm/gear/details/EUR/EN,crid=30,contentid=761 Labtec Webcam 2200]
* [http://labtec.com/index.cfm/gear/details/EUR/EN,crid=30,contentid=761 Labtec Webcam 2200]
Line 1,049: Line 1,548:


[[Category:Hardware]]
[[Category:Hardware]]
[[Category:Chipsets]]
[[Category:USB]]

Latest revision as of 07:01, 29 April 2012

PixArt PAC7301/PAC7302 is a System on a Chip (SoC) with multimedia sensor capabilities. The chip is supported by the gspca_pac7302 kernel module.

Overview/Features

  • USB 1.1 interface
  • EEPROM interface
  • CMOS VGA sensor (640x480) for video and still image capturing
  • Microphone input (only on PixArt PAC7302)
  • Snapshot button input
  • User feedback LED output

Components Used

The webcams based on the PixArt PAC7301/PAC7302 chip usually consists only of the chip and some external resistors, capacitors, button and a microphone.

Other Images

Identification

The USB Vendor ID and Product ID can be programmed. The Product ID range of 0x2620..0x262F is mentioned on the schematics in the PixArt PAC7301/PAC7302 datasheet.

The gspca_pac7302 driver supports the following devices:

USB Vendor ID USB Device ID Device Name Note
0x06f8 0x3009 Hercules Classic Link
0x093a 0x2620 Apollo AC-905 The manual, page 11 of this device describes a software called AMCAP to set up different camera parameters in Windows.
0x093a 0x2621
0x093a 0x2622 Genius Eye 312 FL_VFLIP
0x093a 0x2624 FL_VFLIP
0x093a 0x2626 Labtec Webcam 2200
0x093a 0x2628 Genius iLook 300
0x093a 0x2629 Genious iSlim 300 (?)

maybe a typo? maybe related to Genius Slim series?

FL_VFLIP
0x093a 0x262a Webcam 300k
0x093a 0x262c Philips SPC 230 NC In the User's Manual, page 12 there is a detailed picture settings panel which can adjust the different controls.

The webcam driver may also support the following devices with only a little modification. The webcam drivers for Windows installs the pac7302.sys file. It is possible to download the driver and install it under Linux using wine. If this driver file is installed then we know that the webcam is based on the PixArt PAC7301/PAC7302. Then it is necesary to check the pac7302.inf file to find out the USB Vendor ID and USB Device ID for a specific webcam. The following table summarizes the devices identified with this method.

USB Vendor ID USB Device ID Device Name Note
0x093a 0x2625 Genius iSlim 310 Identified from the driver installed with wine-1.1.37
0x093a 0x2627 Genius FaceCam 300 Identified from the driver installed with wine-1.0.1. See the installed windows/inf/facecam300.inf .


The Labtec Webcam 2200 is an device which contains the PixArt PAC7302 chip. The identification of this device is as follows: 

Bus 003 Device 002: ID 093a:2626 Pixart Imaging, Inc. 
Device Descriptor:
 bLength                18
 bDescriptorType         1
 bcdUSB               1.10
 bDeviceClass            0 (Defined at Interface level)
 bDeviceSubClass         0 
 bDeviceProtocol         0 
 bMaxPacketSize0         8
 idVendor           0x093a Pixart Imaging, Inc.
 idProduct          0x2626 
 bcdDevice            1.00
 iManufacturer           0 
 iProduct                0 
 iSerial                 0 
 bNumConfigurations      1
 Configuration Descriptor:
   bLength                 9
   bDescriptorType         2
   wTotalLength          697
   bNumInterfaces          3
   bConfigurationValue     1
   iConfiguration          0 
   bmAttributes         0x80
     (Bus Powered)
   MaxPower              100mA
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        0
     bAlternateSetting       0
     bNumEndpoints           6
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass    255 Vendor Specific Subclass
     bInterfaceProtocol    255 Vendor Specific Protocol
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x81  EP 1 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x02  EP 2 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x83  EP 3 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x04  EP 4 OUT
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x85  EP 5 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0000  1x 0 bytes
       bInterval               1
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x06  EP 6 OUT
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0000  1x 0 bytes
       bInterval               1
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        0
     bAlternateSetting       1
     bNumEndpoints           6
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass    255 Vendor Specific Subclass
     bInterfaceProtocol    255 Vendor Specific Protocol
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x81  EP 1 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x02  EP 2 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x83  EP 3 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x04  EP 4 OUT
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x85  EP 5 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0080  1x 128 bytes
       bInterval               1
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x06  EP 6 OUT
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0000  1x 0 bytes
       bInterval               1
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        0
     bAlternateSetting       2
     bNumEndpoints           6
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass    255 Vendor Specific Subclass
     bInterfaceProtocol    255 Vendor Specific Protocol
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x81  EP 1 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x02  EP 2 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x83  EP 3 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x04  EP 4 OUT
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x85  EP 5 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0100  1x 256 bytes
       bInterval               1
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x06  EP 6 OUT
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0000  1x 0 bytes
       bInterval               1
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        0
     bAlternateSetting       3
     bNumEndpoints           6
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass    255 Vendor Specific Subclass
     bInterfaceProtocol    255 Vendor Specific Protocol
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x81  EP 1 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x02  EP 2 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x83  EP 3 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x04  EP 4 OUT
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x85  EP 5 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0180  1x 384 bytes
       bInterval               1
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x06  EP 6 OUT
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0000  1x 0 bytes
       bInterval               1
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        0
     bAlternateSetting       4
     bNumEndpoints           6
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass    255 Vendor Specific Subclass
     bInterfaceProtocol    255 Vendor Specific Protocol
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x81  EP 1 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x02  EP 2 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x83  EP 3 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x04  EP 4 OUT
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x85  EP 5 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               1
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x06  EP 6 OUT
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0000  1x 0 bytes
       bInterval               1
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        0
     bAlternateSetting       5
     bNumEndpoints           6
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass    255 Vendor Specific Subclass
     bInterfaceProtocol    255 Vendor Specific Protocol
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x81  EP 1 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x02  EP 2 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x83  EP 3 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x04  EP 4 OUT
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x85  EP 5 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0280  1x 640 bytes
       bInterval               1
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x06  EP 6 OUT
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0000  1x 0 bytes
       bInterval               1
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        0
     bAlternateSetting       6
     bNumEndpoints           6
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass    255 Vendor Specific Subclass
     bInterfaceProtocol    255 Vendor Specific Protocol
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x81  EP 1 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x02  EP 2 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x83  EP 3 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x04  EP 4 OUT
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x85  EP 5 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0300  1x 768 bytes
       bInterval               1
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x06  EP 6 OUT
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0000  1x 0 bytes
       bInterval               1
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        0
     bAlternateSetting       7
     bNumEndpoints           6
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass    255 Vendor Specific Subclass
     bInterfaceProtocol    255 Vendor Specific Protocol
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x81  EP 1 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x02  EP 2 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x83  EP 3 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x04  EP 4 OUT
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x85  EP 5 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0380  1x 896 bytes
       bInterval               1
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x06  EP 6 OUT
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0000  1x 0 bytes
       bInterval               1
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        0
     bAlternateSetting       8
     bNumEndpoints           6
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass    255 Vendor Specific Subclass
     bInterfaceProtocol    255 Vendor Specific Protocol
     iInterface              0 
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x81  EP 1 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x02  EP 2 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0040  1x 64 bytes
       bInterval               0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x83  EP 3 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x04  EP 4 OUT
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0002  1x 2 bytes
       bInterval              50
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x85  EP 5 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x03ff  1x 1023 bytes
       bInterval               1
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x06  EP 6 OUT
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0000  1x 0 bytes
       bInterval               1
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        1
     bAlternateSetting       0
     bNumEndpoints           0
     bInterfaceClass         1 Audio
     bInterfaceSubClass      1 Control Device
     bInterfaceProtocol      0 
     iInterface              0 
     AudioControl Interface Descriptor:
       bLength                 9
       bDescriptorType        36
       bDescriptorSubtype      1 (HEADER)
       bcdADC               1.00
       wTotalLength           39
       bInCollection           1
       baInterfaceNr( 0)       2
     AudioControl Interface Descriptor:
       bLength                12
       bDescriptorType        36
       bDescriptorSubtype      2 (INPUT_TERMINAL)
       bTerminalID             1
       wTerminalType      0x0201 Microphone
       bAssocTerminal          0
       bNrChannels             1
       wChannelConfig     0x0000
       iChannelNames           0 
       iTerminal               0 
     AudioControl Interface Descriptor:
       bLength                 9
       bDescriptorType        36
       bDescriptorSubtype      6 (FEATURE_UNIT)
       bUnitID                 2
       bSourceID               1
       bControlSize            2
       bmaControls( 0)      0x03
       bmaControls( 0)      0x00
         Mute
         Volume
       iFeature                0 
     AudioControl Interface Descriptor:
       bLength                 9
       bDescriptorType        36
       bDescriptorSubtype      3 (OUTPUT_TERMINAL)
       bTerminalID             3
       wTerminalType      0x0101 USB Streaming
       bAssocTerminal          0
       bSourceID               2
       iTerminal               0 
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        2
     bAlternateSetting       0
     bNumEndpoints           0
     bInterfaceClass         1 Audio
     bInterfaceSubClass      2 Streaming
     bInterfaceProtocol      0 
     iInterface              0 
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        2
     bAlternateSetting       1
     bNumEndpoints           1
     bInterfaceClass         1 Audio
     bInterfaceSubClass      2 Streaming
     bInterfaceProtocol      0 
     iInterface              0 
     AudioStreaming Interface Descriptor:
       bLength                 7
       bDescriptorType        36
       bDescriptorSubtype      1 (AS_GENERAL)
       bTerminalLink           3
       bDelay                  1 frames
       wFormatTag              1 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     0x89  EP 9 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0020  1x 32 bytes
       bInterval               1
       bRefresh                0
       bSynchAddress           0
       AudioControl Endpoint Descriptor:
         bLength                 7
         bDescriptorType        37
         bDescriptorSubtype      1 (EP_GENERAL)
         bmAttributes         0x00
         bLockDelayUnits         0 Undefined
         wLockDelay              0 Undefined
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        2
     bAlternateSetting       2
     bNumEndpoints           1
     bInterfaceClass         1 Audio
     bInterfaceSubClass      2 Streaming
     bInterfaceProtocol      0 
     iInterface              0 
     AudioStreaming Interface Descriptor:
       bLength                 7
       bDescriptorType        36
       bDescriptorSubtype      1 (AS_GENERAL)
       bTerminalLink           3
       bDelay                  1 frames
       wFormatTag              1 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]        48000
     Endpoint Descriptor:
       bLength                 9
       bDescriptorType         5
       bEndpointAddress     0x89  EP 9 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0060  1x 96 bytes
       bInterval               1
       bRefresh                0
       bSynchAddress           0
       AudioControl Endpoint Descriptor:
         bLength                 7
         bDescriptorType        37
         bDescriptorSubtype      1 (EP_GENERAL)
         bmAttributes         0x00
         bLockDelayUnits         0 Undefined
         wLockDelay              0 Undefined
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        2
     bAlternateSetting       3
     bNumEndpoints           1
     bInterfaceClass         1 Audio
     bInterfaceSubClass      2 Streaming
     bInterfaceProtocol      0 
     iInterface              0 
     AudioStreaming Interface Descriptor:
       bLength                 7
       bDescriptorType        36
       bDescriptorSubtype      1 (AS_GENERAL)
       bTerminalLink           3
       bDelay                  1 frames
       wFormatTag              1 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     0x89  EP 9 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0020  1x 32 bytes
       bInterval               1
       bRefresh                0
       bSynchAddress           0
       AudioControl Endpoint Descriptor:
         bLength                 7
         bDescriptorType        37
         bDescriptorSubtype      1 (EP_GENERAL)
         bmAttributes         0x00
         bLockDelayUnits         0 Undefined
         wLockDelay              0 Undefined
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        2
     bAlternateSetting       4
     bNumEndpoints           1
     bInterfaceClass         1 Audio
     bInterfaceSubClass      2 Streaming
     bInterfaceProtocol      0 
     iInterface              0 
     AudioStreaming Interface Descriptor:
       bLength                 7
       bDescriptorType        36
       bDescriptorSubtype      1 (AS_GENERAL)
       bTerminalLink           3
       bDelay                  1 frames
       wFormatTag              1 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     0x89  EP 9 IN
       bmAttributes            1
         Transfer Type            Isochronous
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0020  1x 32 bytes
       bInterval               1
       bRefresh                0
       bSynchAddress           0
       AudioControl Endpoint Descriptor:
         bLength                 7
         bDescriptorType        37
         bDescriptorSubtype      1 (EP_GENERAL)
         bmAttributes         0x00
         bLockDelayUnits         0 Undefined
         wLockDelay              0 Undefined
Device Status:     0x0000
 (Bus Powered)

Making it Work

To use this device the following components are necessary:

Firmware

No firmware is necessary to use this device.

Drivers

The gspca_pac7302 driver was separated from the gspca_pac7311 with the commit 1408b8472910e894b290205b4baed5b14b8f45af. If you have a kernel version 2.6.32 or before then use gspca_pac7311 instead of gspca_pac7302.

The support for snapshot button is available since 28 Jan 2010 in one of the repositories. The patch was merged as commit aed6f1b5fe4e95cf8a9fc149e25041aa8cc7c78a to the mailine and it is included in Linux kernel starting with the stable release 2.6.37, released on 4 Jan 2011.

Sample Kernel Output

This is the kernel output when the Labtec Webcam 2200 is plugged in. You may recognise the pac7302 driver and the snd-usb-audio driver attaching themselves to the device. 

# dmesg
[ 2568.748414] usb 3-1: new full speed USB device using uhci_hcd and address 2
[ 2569.225907] Linux video capture interface: v2.00
[ 2569.269819] gspca: main v2.8.0 registered
[ 2569.311677] gspca: probing 093a:2626
[ 2569.333006] gspca: video0 created
[ 2569.334721] gspca: probing 093a:2626
[ 2569.334733] gspca: intf != 0
[ 2569.336295] gspca: probing 093a:2626
[ 2569.336306] gspca: intf != 0
[ 2569.352270] usbcore: registered new interface driver pac7302
[ 2569.352285] pac7302: registered
[ 2569.654995] usbcore: registered new interface driver snd-usb-audio

Remote Control Support

Not applicable.

Programming reference

Note: this chapter is based on the Linux gspca_pac7302 driver and on trial-and error. Use information here on your risk.

The PAC7301/PAC7302 can be controlled through registers. The registers are grouped to pages of 256 registers. The registers can be written by sending an USB control message to the device. The value parameter of usb_control_msg() is always zero; the index parameter specifies the offset within a page; the data and length parameters specify the register content to be written.

The different register pages can be switched by writing the new page value to offset 255 of any page.

Register Page Register Offset Description Accessed in function
0 0x00..0x0e (unknown)
0 0x0f..0x20 setcolors()
0 0x21..0x54 (unknown)
0 0x55 Image filter
0 0x56..0x6d (unknown)
0 0x6e Digital tilt
0 0x6f Digital pan
0 0x70..0x71 (unknown)
0 0x72 Test pattern and test overlay
0 0x73..0xa1 (unknown)
0 0xa2..0xab setbrightcont()
0 0xac..0xc4 (unknown)
0 0xc5 setbrightcont()
0 0xc6 setwhitebalance()
0 0xc7 setbluebalance()
0 0xc8-0xdb (unknown)
0 0xdc setbrightcont(), setcolors()
0 0xdd-0xfe (unknown)
0 0xff Select register page
1 0x00..0x77 (unknown)
1 0x78 Start/stop streaming, LED control
1 0x79..0xfe (unknown)
1 0xff Select register page
3 0x00..0x01 (unknown)
3 0x02 Exposure setexposure()
3 0x03..0x0f (unknown)
3 0x10 Gain setgain()
3 0x11 setcolors(), setgain(), setexposure(), sethvflip()
3 0x12..0x20 (unknown)
3 0x21 Horizontal and vertical flip sethvflip()
3 0x22..0xfe (unknown)
3 0xff Select register page

Image filter

Register page, offset: 0, 0x55

7 6 5 4 3 2 1 0
? ? ? ? ? EDGE ? ?
? ? ? ? ? w ? ?


Bits Field Description
2 EDGE Activates edge detection image filter

0: Normal picture
1: Edge detection activated


Digital tilt

Register page, offset: 0, 0x6e

7 6 5 4 3 2 1 0
TILT
w


Bits Field Description
7-0 TILT Digital tilt

Digital pan

Register page, offset: 0, 0x6f

7 6 5 4 3 2 1 0
PAN
w


Bits Field Description
7-0 PAN Digital pan

Test pattern, test overlay

Register page, offset: 0, 0x72

7 6 5 4 3 2 1 0
? ? ? TEST_OVERLAY TEST_PATTERN
? ? ? w w


Bits Field Description
4 TEST_OVERLAY Test overlay

0: normal operation, test overlay generation off
1: test overlay on

3-0 TEST_PATTERN Test pattern generation:

0x0: normal operation, test pattern generation off
0x1: generate white test pattern: the whole image is white
0x2: generate black test pattern: the whole image is black
0x3: generate red test pattern: the whole image is red
0x4: generate lime test pattern: the whole image is lime
0x5: generate blue test pattern: the whole image is blue
0x6: generate aqua test pattern: the whole image is aqua
0x7: generate fuchsia test pattern: the whole image is fuchsia
0x8: generate yellow test pattern: the whole image is yellow
0x9: generate test pattern with colored horizontal and vertical bars
0xA: generate test pattern with small colored pixels all around the image
0xB: generate a gradient test pattern starting from black on the top and bright color on the bottom
0xC: generate a gradient test pattern starting from white on the left towards black on the right
0xD: generate frequent vertical gadient bars white to black, from left to right
0xE: generate black test pattern: the whole image is black
0xF: generate black test pattern: the whole image is black

These test patterns can be generated when the gspca_pac7302 driver is built with CONFIG_VIDEO_ADV_DEBUG=y. First start streaming e.g. with cheese then execute "v4l2-dbg --set-register=0x72 0x01" for value 0x01. These test patterns were generated using Labtec Webcam 2200 hardware.

Value 0x1: generate white test pattern: Pac7302 reg0x72 value0x01.jpg


Value 0x2: generate black test pattern: Pac7302 reg0x72 value0x02.jpg


Value 0x3: generate red test pattern: Pac7302 reg0x72 value0x03.jpg


Value 0x4: generate lime test pattern: Pac7302 reg0x72 value0x04.jpg


Value 0x5: generate blue test pattern: Pac7302 reg0x72 value0x05.jpg


Value 0x6: generate aqua test pattern: Pac7302 reg0x72 value0x06.jpg


Value 0x7: generate fuchsia test pattern: Pac7302 reg0x72 value0x07.jpg


Value 0x8: generate yellow test pattern: Pac7302 reg0x72 value0x08.jpg


Value 0x9: generate test pattern with colored horizontal and vertical bars: Pac7302 reg0x72 value0x09.jpg


Value 0xA: generate test pattern with small colored pixels all around the image: Pac7302 reg0x72 value0x0a.jpg


Value 0xB: generate a gradient test pattern starting from black on the top and bright color on the bottom: Pac7302 reg0x72 value0x0b.jpg


Value 0xC: generate a gradient test pattern starting from white on the left towards black on the right: Pac7302 reg0x72 value0x0c.jpg


Value 0xD: generate frequent vertical gadient bars white to black, from left to right: Pac7302 reg0x72 value0x0d.jpg


Value 0x13: generate red test pattern with test overlay on: Pac7302 reg0x72 value0x13.jpg

Streaming on/off, LED control

Register page, offset: 1, 0x78

7 6 5 4 3 2 1 0
? nLED ? ? ? ? ? STREAMING
? w ? ? ? ? ? w


Bits Field Description
6 nLED Controls the feedback LED.

0: LED active
1: LED off

0 STREAMING Controls the video stream from the webcam.

0: steram is off
1: stream is on

Horizontal and vertical flip

Register page, offset: 3, 0x21

7 6 5 4 3 2 1 0
? ? ? ? HFLIP VFLIP ? ?
? ? ? ? w w ? ?


Bits Field Description
3 HFLIP Activate horizontal flip of the image

0: Horizontal flip not active
1: Horizontal flip active

2 VFLIP Activate vertical flip of the image

0: Vertical flip is not active
1: Vertical flip is active

External Links

Retrieved from "https://www.linuxtv.org/wiki/index.php?title=PixArt_PAC7301/PAC7302&oldid=30745"