DIGILENT MIPI-CSI Camera Set
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This example uses RDigilent Pcam 5C is a MIPI-CSI interface camera (built on OV5640 MIPI sensor) as a test device for CSI Interface. On this page OV5640 sensor integration, settings and usage on i.MX8M processors are shown.
Digilent Pcam 5C is a MIPI-CSI interface, 5 MP Fixed-Focus color camera connected to iMX8M Development Baseboard
Kernel detection
root@imx8mq-voipac:~# dmesg | grep ov56 [ 2.398433] ov5640_mipi 1-003c: No pin available [ 2.403090] ov5640_mipi 1-003c: No sensor pwdn pin available [ 2.408777] ov5640_mipi 1-003c: No sensor reset pin available [ 2.414571] ov5640_regulator_enable: cannot get io voltage error - err:-517 [ 2.539603] ov5640_mipi 2-003c: No pin available [ 2.549079] ov5640_mipi 2-003c: No sensor reset pin available [ 2.554887] ov5640_regulator_enable: cannot get io voltage error - err:-517 [ 2.999855] ov5640_mipi 1-003c: No pin available [ 3.005558] ov5640_mipi 1-003c: No sensor reset pin available [ 3.012003] ov5640_mipi 1-003c: 1-003c supply DVDD not found, using dummy regulator [ 3.019785] ov5640_mipi 1-003c: 1-003c supply AVDD not found, using dummy regulator [ 3.039290] ov5640_mipi 1-003c: Read reg error: reg=300a [ 3.044691] ov5640_mipi 1-003c: Camera is not found [ 3.051918] ov5640_mipi 2-003c: No pin available [ 3.062814] ov5640_mipi 2-003c: No sensor reset pin available [ 3.069209] ov5640_mipi 2-003c: 2-003c supply DVDD not found, using dummy regulator [ 3.076945] ov5640_mipi 2-003c: 2-003c supply AVDD not found, using dummy regulator [ 4.291092] mxc-mipi-csi2_yav 30a70000.mipi_csi: Registered sensor subdevice: ov5640_mipi 2-003c [ 4.304334] ov5640_mipi 2-003c: Camera is found
I2C detection
MINISASTOCSI camera chip is connected via I2C3. The most important address for correct detection is 0x3c.
root@imx8mq-voipac:~# i2cdetect -y 2
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: UU UU UU UU -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- UU -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
MINISASTOCSI camera can be also connected to I2C2 interface by moving 0R resistors. However second camera connected on CSI-2 interface have same address 0x3c as MINISASTOCSI camera connected on CSI-1 interface.
Modules listing
Kernel 4.1
root@imx6-openrex:~# lsmod Module Size Used by mxc_v4l2_capture 27624 2 ipu_bg_overlay_sdc 5385 1 mxc_v4l2_capture ipu_still 2331 1 mxc_v4l2_capture ipu_prp_enc 5903 1 mxc_v4l2_capture ipu_csi_enc 3904 1 mxc_v4l2_capture ipu_fg_overlay_sdc 6130 1 mxc_v4l2_capture ov5647_camera_mipi_int 30566 0 adv7610_video 6373 0 v4l2_int_device 2872 4 ov5647_camera_mipi_int,adv7610_video,ipu_csi_enc,mxc_v4l2_capture mxc_dcic 6528 0 root@imx8mq-voipac:~# lsmod Module Size Used by crct10dif_ce 16384 1 mwifiex_pcie 45056 0 mwifiex 294912 1 mwifiex_pcie galcore 610304 2
Resolution setting
The camera support video streaming formats 1080p (at 30 frames per second) and 720p (at 60 frames per second)
1280x960
echo 0 > /sys/bus/i2c/devices/1-0036/ov5647_mode
1280x720
echo 1 > /sys/bus/i2c/devices/1-0036/ov5647_mode
1920x1080
echo 2 > /sys/bus/i2c/devices/1-0036/ov5647_mode
640x480
echo 3 > /sys/bus/i2c/devices/1-0036/ov5647_mode
1024x768 (default)
echo 4 > /sys/bus/i2c/devices/1-0036/ov5647_mode
960x720
echo 5 > /sys/bus/i2c/devices/1-0036/ov5647_mode
640x480 (narrow angle of view)
echo 6 > /sys/bus/i2c/devices/1-0036/ov5647_mode
Gstreamer
Capture single JPEG picture
root@imx8mq-voipac:~# gst-launch-1.0 v4l2src num-buffers=1 ! jpegenc ! filesink location=sample_image.jp eg Setting pipeline to PAUSED ... Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock [ 1301.273334] ov5640_mipi 2-003c: s_stream: 1 Got EOS from element "pipeline0".[ 1303.353181] ov5640_mipi 2-003c: s_stream: 0 Execution ended after 0:00:02.649996154 Setting pipeline to PAUSED ... Setting pipeline to READY ... Setting pipeline to NULL ... Freeing pipeline ... root@imx8mq-voipac:~# ls sample_image.jpeg root@imx8mq-voipac:~#
The image stored in local media with name sample_image.jpeg
Video preview
root@imx8mq-voipac:~# GST_DEBUG=GST_BUFFER:5 gst-launch-1.0 v4l2src ! 'video/x-raw,framerate=30/1' ! aut ovideosink Setting pipeline to PAUSED ... Pipeline is live and does not need PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock 0:00:00.842776580 469 0xaaaadc001c00 DEBUG GST_BUFFER gstbuffer.c:2279:gst_buffer_add_meta: alloc metadata 0xaaaadc0623c0 (GstVideoMeta) of size 112 0:00:00.842935198 469 0xaaaadc001c00 DEBUG GST_BUFFER gstbuffer.c:2279:gst_buffer_add_meta: alloc metadata 0xaaaadc062440 (GstVideoMeta) of size 112 0:00:00.843278592 469 0xaaaadc001c00 DEB[ 1415.898001] ov5640_mipi 2-003c: s_stream: 1 UG GST_BUFFER gstbuffer.c:2279:gst_buffer_add_meta: alloc metadata 0xaaaadc0624c0 (GstVideoMeta) of size 112 0:00:00.843338584 469 0xaaaadc001c00 DEBUG GST_BUFFER gstbuffer.c:2279:gst_buffer_add_meta: alloc metadata 0xaaaadc062540 (GstVideoMeta) of size 112 [ 1416.119964] skip frame 1
The video stream from camera can be displayed on display/monitor