In this guide, we will step-by-step guide you to use video camera OV5647 on SP7350 platforms.
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1 OV5647 specification
5MP Max photograph resolution (2592 x 1944 = 5,038,848 pixels)
Pixel Size: 1.4 x 1.4 μm
Optical size: 1/4"
Lens: f=3.6 mm, f/2.9
Viewing Angle: 54° x 41°
Max video resolution: 1080p@30fps
Max frame rate: 480p@90fps
Maximum exposure times (seconds): 0.97
Selectable video resolutions: 1080p@30fps, 720p@60fps, 480p@90fps
2 Setup
2.1 Enable OV5647 in kernel configuration
1 Enter kernel configuration
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cd ./linux/kernel
make menuconfig |
2 Selects submenus: Device Drivers>Multimedia support>Media ancillary drivers>Camera sensor devices
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3 Select OmniVision OV5647 sensor support and pressing <Y> inlucdes. Then save and exit.
2.2 Modify device tree source
Device-tree source files of SP7350 are located in linux/kernel/arch/arm64/boot/dts/sunplus/.
Here lists all files for SP7350 boards:
Boards | Device-tree source files |
C3V-W EVB | sp7350-ev.dts |
Modify device tree source file to define OV5647 source for driver
2.2.1 Using SP7350 MIPI-CSI-RX4
Open OV5647_INT macro to add OV5647 node and link mipicsirx4.
2.2.2 Using SP7350 other MIPI-CSI-RX
Define OV5647 node in i2c node:
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i2c {
#address-cells = <1>;
#size-cells = <0>;
ov5647: ov5647@36 {
compatible = "ovti,ov5647";
reg = <0x36>;
clocks = <&ov5647_clk>;
avdd-supply = <&ov5647_avdd_2v8>;
dovdd-supply = <&ov5647_dovdd_1v8>;
dvdd-supply = <&ov5647_dvdd_1v5>;
port {
ov5647_out: endpoint {
remote-endpoint = <&csi1_ep1>;
data-lanes = <1 2>;
clock-noncontinuous;
link-frequencies = /bits/ 64 <297000000>;
};
};
};
}; |
port: Should contain one endpoint sub-node used to model connection to the video receiver according to the specification defined in Documentation/devicetree/bindings/media/video-interfaces.txt.
Video receiver endpoint sub-node should defined in mipicsirx node. For example:
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mipicsirx: csirx@f8005480 {
port@0 {
reg = <0>;
/* MIPI CSI-2 bus endpoint */
csi1_ep1: endpoint {
remote-endpoint = <&ov5647_out>;
bus-type = <4>;
clock-lanes = <0>;
data-lanes = <1 2>;
};
}; |
2.3 Compile and burn
2.4 Connect sensor module
Using C3V-W board MIPI-CSI-RX4, as follows：
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2.5 Check
After the burning is completed, start the board. The system should print the following information through the serial port.
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[ 1.944413] sp-csi2 f8005480.csirx: 2 lanes found
[ 1.944819] sp-vin f8005980.video: assigned reserved memory node mipicsirx@4f600000
[ 1.948929] ov5647 0-0036: Consider updating driver ov5647 to match on endpoints
[ 1.956573] sp-vin f8005980.video: Device VIN8 registered as video0
[ 1.962544] sp-vin f8005980.video: SP VIN driver probed |
After the system startup is completed, the video device can be viewed.
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root@dbv3:~# ls /dev/video0
/dev/video0 |
3 Test
3.1 V4l2-ctl command
This command is used to control V4L2 devices from the command line. It allows you to query device capabilities, set device parameters, and capture video and still image.
Use v4l2-ctl --all --device /dev/video0 command getting device all information.
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root@dbv3:~# v4l2-ctl --all --device /dev/video0
Driver Info:
Driver name : sp_vin
Card type : SP_VIN
Bus info : platform:f8005980.video
Driver version : 5.10.201
Capabilities : 0xa5200001
Video Capture
Read/Write
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x25200001
Video Capture
Read/Write
Streaming
Extended Pix Format
Media Driver Info:
Driver name : sp_vin
Model : sunplus,sp7350-vin
Serial :
Bus info : platform:f8005980.video
Media version : 5.10.201
Hardware revision: 0x00000000 (0)
Driver version : 5.10.201
Entity Info:
ID : 15
Name : VIN8 output
Type : V4L2 I/O
Pad : 0: Sink
Priority: 2
Video input : 0 (VIN8 output: ok)
Format Video Capture:
Width/Height : 640/480
Pixel Format : 'GBRG' (8-bit Bayer GBGB/RGRG)
Field : None
Bytes per Line : 640
Size Image : 307200
Colorspace : Raw
Transfer Function : Default (maps to None)
YCbCr/HSV Encoding: Default (maps to ITU-R 601)
Quantization : Default (maps to Full Range)
Flags :
User Controls
white_balance_automatic 0x0098090c (bool) : default=0 value=0
exposure 0x00980911 (int) : min=4 max=980 step=1 default=980 value=980
gain_automatic 0x00980912 (bool) : default=0 value=0
horizontal_flip 0x00980914 (bool) : default=0 value=0 flags=modify-layout
vertical_flip 0x00980915 (bool) : default=0 value=0 flags=modify-layout
alpha_component 0x00980929 (int) : min=0 max=255 step=1 default=255 value=255
Camera Controls
auto_exposure 0x009a0901 (menu) : min=0 max=1 default=1 value=1
Image Source Controls
vertical_blanking 0x009e0901 (int) : min=24 max=32287 step=1 default=504 value=504
horizontal_blanking 0x009e0902 (int) : min=1256 max=1256 step=1 default=1256 value=1256 flags=read-only
analogue_gain 0x009e0903 (int) : min=16 max=1023 step=1 default=32 value=32
Image Processing Controls
pixel_rate 0x009f0902 (int64) : min=77291670 max=77291670 step=1 default=77291670 value=77291670 flags=read-only |
3.2 Capture image
3.2.1 Config video device
Use v4l2-ctl -d /dev/video0 --set-ctrl params=value setting device controls.
Enable auto_exposure:
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v4l2-ctl -d /dev/video0 --set-ctrl auto_exposure=1 |
Enable gain_automatic
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v4l2-ctl -d /dev/video0 --set-ctrl gain_automatic=1 |
Enable white_balance_automatic
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v4l2-ctl -d /dev/video0 --set-ctrl white_balance_automatic=1 |
3.2.2 Capture
Use v4l2-ctl --list-formats-ext --device /dev/video0 querying device video format.
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root@dbv3:~# v4l2-ctl --list-formats-ext --device /dev/video0
ioctl: VIDIOC_ENUM_FMT
Type: Video Capture
[0]: 'GBRG' (8-bit Bayer GBGB/RGRG)
Size: Discrete 640x480
[1]: 'GB10' (10-bit Bayer GBGB/RGRG)
Size: Discrete 2592x1944
Size: Discrete 1920x1080
Size: Discrete 1296x972
Size: Discrete 640x480
[2]: 'pGAA' (10-bit Bayer GBGB/RGRG Packed)
Size: Discrete 2592x1944
Size: Discrete 1920x1080
Size: Discrete 1296x972
Size: Discrete 640x480
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Use v4l2-ctl --stream capture image.
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v4l2-ctl -d /dev/video0 --set-fmt-video=width=1920,height=1080,pixelformat=pGAA --stream-mmap=3 --stream-to=/home/root/ov5647.raw --stream-skip=9 --stream-count=1 |
--set-fmt-video=width=1920,height=1080,pixelformat=pGAA set image format
--stream-count <count> stream <count> buffers. The default is to keep streaming forever. This count does not include the number of initial skipped buffers as is passed by --stream-skip.
--stream-skip <count> skip the first <count> buffers. The default is 0.
--stream-to <file> stream to this file. The default is to discard the data. If <file> is '-', then the data is written to stdout and the --silent option is turned on automatically.
--stream-mmap <count> capture video using mmap() [VIDIOC_(D)QBUF] count: the number of buffers to allocate. The default is 3.
After executing the capture command, the stream data is written to /home/root/ov5647.raw.
3.3 Display image raw data
3.3.1 Download and install raw image viewer
Download raw image viewer from PixelViewer | Carina Studio. And PixelViewer is an open source project based cross-platform image which viewer supports reading raw Luminance/YUV/RGB/ARGB/Bayer pixels data from file and rendering it.
3.3.2 Use pixel viewer open image
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Config render params by 3.2.2 v4l2-ctl capture command
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