Camera

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Camera functionality in sunxi is not well tested, and still in Proof-Of-Concept stage. However, in this document, I will try to write down my experiences with CSI cameras and one webcam.

WHAT YOU NEED:

1) Be able to compile & install linux-sunxi kernel ( see: http://linux-sunxi.org/Linux_Kernel )

2) Be able to modify your FEX file, and create script.bin ( See: http://linux-sunxi.org/Fex_Guide and http://linux-sunxi.org/Script.bin )

3) A PCBA with Allwinner based SoC ( such as A20), with CSI / USB interface.

4) A Compatible USB Webcam ( Such as Logitech c510) or a CSI camera module ( See images below )

KERNEL PART:

For this part, I had to make a lot of trial/error ; because when you compile some CSI drivers, they compile fine, but cause segmentation faults or random kernel panics in runtime. That is one of the reasons, why I say the CSI support is in alpha stage in sunxi.

Here is my current setting in my kernel menuconfig, to be able to easily switch between different CSI camera modules and USB Webcam:

After compile & install your kernel with above settings, you may think to autoload your csi drivers during boot. I have managed to do this by adding

sun4i_csi0

to my /etc/modules file in my Debian wheezy 7 distro in my board. Otherwise, you may add it manually like this:

insmod /lib/modules/3.4.79-sertac+/kernel/drivers/media/video/sun4i_csi/csi0/sun4i_csi0.ko

This would probably insmod your ov5640.ko automatically as well.

CSI Camera and FEX Relationship:

First of all, in order to have CSI camera functionality in your A20 (or any other) based PCB, you must edit your FEX file accordingly.

In the FEX file, CSI camera is setup in two places, [camera_list_para] and [csiX_para]:

[camera_list_para]
camera_list_para_used = 1
ov7670 = 0
gc0308 = 0
gt2005 = 0
hi704 = 0
sp0838 = 0
mt9m112 = 0
mt9m113 = 0
gc2035 = 0
ov2655 = 0
hi253 = 0
gc0307 = 0
mt9d112 = 0
ov5640 = 1
gc2015 = 0
ov2643 = 0
gc0329 = 0
gc0309 = 0
tvp5150 = 0
s5k4ec = 0
ov5650_mv9335 = 0
siv121d = 0

;0x40--hi253 0x5a--s5k4ec 0x78--ov5640

[csi0_para]
csi_used            = 1
csi_mode            = 0
csi_dev_qty         = 1
csi_stby_mode       = 0
;csi_mname           = "s5k4ec"
;csi_mname           = "hi253"
csi_mname           = "ov5640" 
csi_twi_id          = 1
;csi_twi_addr        = 0x5a
;csi_twi_addr        = 0x40
csi_twi_addr        = 0x78 
csi_if              = 0
csi_vflip           = 1
csi_hflip           = 0
csi_iovdd           = "axp20_pll"
csi_avdd            = "axp20_pll"
csi_dvdd            = ""
csi_vol_iovdd       = 2800
csi_vol_dvdd        = 
csi_vol_avdd        = 
csi_flash_pol       = 0

csi_mname_b         = ""

csi_twi_id_b        = 0
csi_twi_addr_b      = 0x42
csi_if_b            = 0
csi_vflip_b         = 0
csi_hflip_b         = 0
csi_iovdd_b         = "axp20_pll"
csi_avdd_b          = ""
csi_dvdd_b          = ""
csi_vol_iovdd_b     = 2800
csi_vol_avdd_b      = 
csi_vol_dvdd_b      = 
csi_flash_pol_b     = 0

csi_pck             = port:PE00<3><default><default><default>
csi_ck              = port:PE01<3><default><default><default>
csi_hsync           = port:PE02<3><default><default><default>
csi_vsync           = port:PE03<3><default><default><default>
csi_d0              = port:PE04<3><default><default><default>
csi_d1              = port:PE05<3><default><default><default>
csi_d2              = port:PE06<3><default><default><default>
csi_d3              = port:PE07<3><default><default><default>
csi_d4              = port:PE08<3><default><default><default>
csi_d5              = port:PE09<3><default><default><default>
csi_d6              = port:PE10<3><default><default><default>
csi_d7              = port:PE11<3><default><default><default>
csi_reset           = port:PH13<1><default><default><0>
csi_power_en        = port:PH16<1><default><default><1>
csi_stby            = port:PH18<1><default><default><1>
csi_flash           =
csi_af_en           =
csi_reset_b         = port:PH14<1><default><default><0>
csi_power_en_b      = port:PH16<1><default><default><0>
csi_stby_b          = port:PH19<1><default><default><0>
csi_flash_b         =
csi_af_en_b         =

[csi1_para]
csi_used = 0
csi_dev_qty = 1
csi_stby_mode = 0
csi_mname = "gc0308"
csi_if = 0
csi_iovdd = "axp20_pll"
csi_avdd = ""
csi_dvdd = ""
csi_vol_iovdd = 2800
csi_vol_dvdd =
csi_vol_avdd =
csi_vflip = 0
csi_hflip = 0
csi_flash_pol = 0
csi_facing = 1
csi_twi_id = 1
csi_twi_addr = 0x42
csi_pck = port:PG00<3><default><default><default>
csi_ck = port:PG01<3><default><default><default>
csi_hsync = port:PG02<3><default><default><default>
csi_vsync = port:PG03<3><default><default><default>
csi_d0 = port:PG04<3><default><default><default>
csi_d1 = port:PG05<3><default><default><default>
csi_d2 = port:PG06<3><default><default><default>
csi_d3 = port:PG07<3><default><default><default>
csi_d4 = port:PG08<3><default><default><default>
csi_d5 = port:PG09<3><default><default><default>
csi_d6 = port:PG10<3><default><default><default>
csi_d7 = port:PG11<3><default><default><default>
csi_reset = port:PH13<1><default><default><0>
csi_power_en = port:PH16<1><default><default><0>
csi_stby = port:PH19<1><default><default><0>

As you may see, in [camera_list_para], I have selected ov5640 as my camera. If your PCB support two CSI cameras ( FRONT and REAR/BACK ), then you may select two of them here.

Also, as you see, in [csi1_para], I set csi_used = 0 , because in my PCB, I only have one CSI connector.

Also, setting correct I2C address for the camera is also important. Please have a look:

;0x40--hi253 
;0x5a--s5k4ec
;0x78--ov5640

csi_twi_addr        = 0x78 

So, for this example, I choose my OV5640 camera module. Also, this "mname" thing is also very sensitive I think. Writing ="ov5640" instead of = "ov5640" causes strange troubles in runtime ( Please note the space between equal sign and the string... Such things may be handled better in DTB thing ? )

Anyway, I also had to inform you that

csi_vflip           = 1
csi_hflip           = 0

works perfectly. So you can rotate camera view in both VERTICAL and HORIZONTAL directions ! I also tested this in Android, it also works well there too.

Finally I have to show some of the camera module behaviours, when you connect to an A20 board with 3.4.79 kernel:

HI253 ( 2Mpix ) CSI Camera module:

[email protected] ~ # insmod /lib/modules/3.4.79-sertac+/kernel/drivers/media/video/sun4i_csi/csi0/sun4i_csi0.ko 
<6>[CSI]Welcome to CSI driver
<6>[CSI]csi_init
<6>[CSI]registered sub device,input_num = 0
<4>axp20_ldo3: Failed to create debugfs directory
<4>axp20_ldo3: Failed to create debugfs directory
<6>[CSI]V4L2 device registered as video0
[email protected] ~ # <6>[CSI]sensor initial success when csi open!

[email protected] ~ # ll /dev/video0 
crw-rw---T 1 root video 81, 0 Jan  4 14:43 /dev/video0
[email protected] ~ # 
[email protected] ~ # v4l2-ctl -L
<6>[CSI]sensor initial success when csi open!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
                     brightness <6>[CSI_ERR]v4l2 sub device queryctrl error!
(int)    : min=-4 max=4 step=1 d<6>[CSI_ERR]v4l2 sub device queryctrl error!
efault=1 value=0 flags=slider
 <6>[CSI_ERR]v4l2 sub device queryctrl error!
                      contrast (<6>[CSI_ERR]v4l2 sub device queryctrl error!
int)    : min=-4 max=4 step=1 default=1 value=0 flags=slider
  <6>[CSI_ERR]v4l2 sub device queryctrl error!
                   saturation (i<6>[CSI_ERR]v4l2 sub device queryctrl error!
nt)    : min=-4 max=4 step=1 def<6>[CSI_ERR]v4l2 sub device queryctrl error!
ault=1 value=0 flags=slider
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
        white_balance_automatic <6>[CSI_ERR]v4l2 sub device queryctrl error!
(bool)   : default=1 value=1
  <6>[CSI_ERR]v4l2 sub device queryctrl error!
             do_white_balance (i<6>[CSI_ERR]v4l2 sub device queryctrl error!
nt)    : min=0 max=5 step=1 defa<6>[CSI_ERR]v4l2 sub device queryctrl error!
ult=0 value=0
                 <6>[CSI_ERR]v4l2 sub device queryctrl error!
      exposure (int)    : min=-4<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!

                horizontal_flip<6>[CSI_ERR]v4l2 sub device queryctrl error!
 (bool)   : default=0 value=0
 <6>[CSI_ERR]v4l2 sub device queryctrl error!
                 vertical_flip (<6>[CSI_ERR]v4l2 sub device queryctrl error!
bool)   : default=0 value=0
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
                  color_effects <6>[CSI_ERR]v4l2 sub device queryctrl error!
(menu)   : min=0 max=9 default=0<6>[CSI_ERR]v4l2 sub device queryctrl error!
 value=0
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
<6>[CSI_ERR]v4l2 sub device queryctrl error!
                flashlight_mode <6>[CSI_ERR]v4l2 sub device queryctrl error!
(menu)   : min=0 max=4 default=0 value=0
[email protected] ~ #
[email protected] ~ # rmmod sun4i_csi0
<6>[CSI]csi_exit
<6>sun4i_csi sun4i_csi.0: unregistering video0
<6>[CSI]csi_release ok!
<6>[CSI]csi_remove ok!
 

Samsung S5K4EC ( 5Mpix ) CSI Camera module:

This works well under android, but there is no driver under 3.4.79

OV5640 ( 5Mpix ) CSI Camera module:

Will be added later..


Logitech c510 USB Webcam:

[email protected] ~ # ehci_irq: port change detect
ehci_irq: port change detect
ehci_irq: port change detect
<6>usb 2-1: new high-speed USB device number 2 using sw-ehci
<6>uvcvideo: Found UVC 1.00 device <unnamed> (046d:081d)
<6>input: UVC Camera (046d:081d) as /devices/platform/sw-ehci.1/usb2/2-1/2-1:1.2/input/input3

[email protected] ~ # 
[email protected] ~ # 
[email protected] ~ # 
[email protected] ~ # v4l2-ctl -L
                     brightness (int)    : min=0 max=255 step=1 default=128 value=128
                       contrast (int)    : min=0 max=255 step=1 default=32 value=32
                     saturation (int)    : min=0 max=255 step=1 default=34 value=34
 white_balance_temperature_auto (bool)   : default=1 value=1
                           gain (int)    : min=0 max=255 step=1 default=64 value=64
           power_line_frequency (menu)   : min=0 max=2 default=2 value=2
				0: Disabled
				1: 50 Hz
				2: 60 Hz
      white_balance_temperature (int)    : min=2800 max=6500 step=1 default=4000 value=4000
                      sharpness (int)    : min=0 max=255 step=1 default=22 value=22
         backlight_compensation (int)    : min=0 max=1 step=1 default=0 value=0
                  exposure_auto (menu)   : min=0 max=3 default=3 value=3
				1: Manual Mode
				3: Aperture Priority Mode
              exposure_absolute (int)    : min=3 max=2047 step=1 default=166 value=166
         exposure_auto_priority (bool)   : default=0 value=1
                   pan_absolute (int)    : min=-36000 max=36000 step=3600 default=0 value=0
                  tilt_absolute (int)    : min=-36000 max=36000 step=3600 default=0 value=0
                  zoom_absolute (int)    : min=1 max=5 step=1 default=1 value=1
[email protected] ~ # 
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