In this guide, we will provide a step-by-step walkthrough on utilizing the OV5647 video camera on SP7350 platforms.
Table of Contents
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1. IMX219 Specification
The Raspberry Pi Camera Module 2 is used here. The pin definition of the SP7350 EV board’s MIPI-CSI RX connectors is compatible with this camera. The camera mounts directly to our SP7350 EV board.
Back-illuminated CMOS image sensor Exmor RTM
2-wire serial communication circuit on chip
CSI2 serial data output (selection of 4lane/2lane)
Timing generator, H and V driver circuits on chip
CDS/PGA on chip
10-bit A/D converter on chip
Automatic optical black (OB) clamp circuit on chip
PLL on chip (rectangular wave)
High sensitivity, low dark current, no smear
Excellent anti-blooming characteristics
Variable-speed shutter function (1 H units)
R, G, B primary color pigment mosaic filters on chip
Max. 30 frame/s in all-pixel scan mode
Pixel rate: 280 [Mpixel/s] (All-pixels mode)
180 frame/s @720p with 2x2 analog (special) binning, 60 frame/s @1080p with V-crop
Data rate: Max. 755 Mbps/lane(@4lane), 912Mbps/Lane(@2lane)
2. Setup a SP7350 Platform
The Raspberry Pi Camera Module 2 is used here. The v2 Camera Module has a Sony IMX219 8-megapixel sensor. The pin definition of the SP7350 EV board’s MIPI-CSI RX connectors is compatible with this module. The module mounts directly to our SP7350 EV board.
2.1. Enable IMX219 Driver in Linux Kernel Configuration
Please follow the steps below.
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Step 3: Select “Sony IMX219 sensor support” and press <Y>. And 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:
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//#define IMX219_IN0 //#define IMX219_IN1 //#define IMX219_IN2 //#define IMX219_IN3 //#define IMX219_IN4 //#define IMX219_IN5 |
2.3. Compile and Burn
2.4. Connect Sensor Module
A Raspberry Pi Camera Module 2 is connected to MIPI/CSI-RX4 port on C3V-W board. It’s shown below.
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2.5. Check
After the burning is completed, start the board. The probing logs for MIPI-CSI RX and VIN drivers can be found. It’s as follows. The video device video0 has been successfully registered.
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~ # ls /dev/video0 /dev/video0 |
3. Test
The v4l2-ctl application is used here. v4l2-ctl is a command line tool for controlling video devices on Linux systems.
3.1. Display Video Device Information
Running ‘v4l2-ctl –all-device‘ command displays all information about the video device video0. The results are as follows.
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~ # 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 Interface Info: ID : 0x03000011 Type : V4L Video Entity Info: ID : 0x0000000f (15) Name : VIN8 output Function : V4L2 I/O Pad 0x01000010 : 0: Sink Link 0x02000013: from remote pad 0x1000003 of entity 'sp_csi2 f8005480.csirx' (Video Pixel Formatter): Data, Enabled Priority: 2 Video input : 0 (VIN8 output: ok) Format Video Capture: Width/Height : 640/480 Pixel Format : 'RG10' (10-bit Bayer RGRG/GBGB) Field : None Bytes per Line : 1280 Size Image : 614400 Colorspace : sRGB Transfer Function : sRGB YCbCr/HSV Encoding: ITU-R 601 Quantization : Full Range Flags : User Controls exposure 0x00980911 (int) : min=4 max=1759 step=1 default=1600 value=1600 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 Image Source Controls vertical_blanking 0x009e0901 (int) : min=4 max=65055 step=1 default=1283 value=1283 horizontal_blanking 0x009e0902 (int) : min=2808 max=2808 step=1 default=2808 value=2808 flags=read-only analogue_gain 0x009e0903 (int) : min=0 max=232 step=1 default=0 value=0 red_pixel_value 0x009e0904 (int) : min=0 max=1023 step=1 default=1023 value=1023 green_red_pixel_value 0x009e0905 (int) : min=0 max=1023 step=1 default=1023 value=1023 blue_pixel_value 0x009e0906 (int) : min=0 max=1023 step=1 default=1023 value=1023 green_blue_pixel_value 0x009e0907 (int) : min=0 max=1023 step=1 default=1023 value=1023 Image Processing Controls pixel_rate 0x009f0902 (int64) : min=182400000 max=182400000 step=1 default=182400000 value=182400000 flags=read-only test_pattern 0x009f0903 (menu) : min=0 max=4 default=0 value=0 (Disabled) 0: Disabled 1: Color Bars 2: Solid Color 3: Grey Color Bars 4: PN9 digital_gain 0x009f0905 (int) : min=256 max=4095 step=1 default=256 value=256 |
3.2. List Supported Video Format and Resolution
Running ‘v4l2-ctl –list-format-ext’ command lists the supported video format and resolution of the video device vidoe0. The results are as follows.
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~ # v4l2-ctl --list-formats-ext --device /dev/video0 ioctl: VIDIOC_ENUM_FMT Type: Video Capture [0]: 'RG10' (10-bit Bayer RGRG/GBGB) Size: Discrete 3280x2464 Size: Discrete 1920x1080 Size: Discrete 1640x1232 Size: Discrete 640x480 [1]: 'pRAA' (10-bit Bayer RGRG/GBGB Packed) Size: Discrete 3280x2464 Size: Discrete 1920x1080 Size: Discrete 1640x1232 Size: Discrete 640x480 [2]: 'RGGB' (8-bit Bayer RGRG/GBGB) Size: Discrete 3280x2464 Size: Discrete 1920x1080 Size: Discrete 1640x1232 Size: Discrete 640x480 |
3.3. Configure Camera
Running ‘v4l2-ctl –get-ctrl’ gets the value of the controls. Running ‘v4l2-ctl –set-ctrl’ sets the value of the controls. The results are as follows.
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~ # v4l2-ctl --get-ctrl digital_gain digital_gain: 256 ~ # v4l2-ctl --set-ctrl digital_gain=2048 ~ # v4l2-ctl --get-ctrl digital_gain digital_gain: 2048 |
3.4. Capture Image
Running following command capture a RAW8 picture. The pixel format RGGB means 8-bit Bayer RGRG/GBGB.
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--stream-count <count>: How many images to capture.
4. Display Image
The PixelViewer application is used here. PixelViewer is an open source project based cross-platform image viewer. You can download it from it’s website.
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