NXP MIPI-CSI Camera Set

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MINISASTOCSI is a MIPI-CSI interface camera kit, based on OmniVision chipset OV5640 Detection, performance and essential commands are described here.

hot-plug.png

MINISASTOCSI-Voipac-BB.png
MINISASTOCSI is a MIPI-CSI interface 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. CSI1-I2C2 and I2C3.png

GPIO control

GPIO pins are controlled by the camera driver and access to these pins is blocked. Power on signal is recognised as GPIO 198, LED GPIO has number 199.

LED located on camera module can be tested by temporarily disabling mipi kernel module and toggling corresponding GPIO pin: 

root@imx6s-openrex:~# modprobe -r ov5647_camera_mipi
root@imx6s-openrex:~# echo 199 > /sys/class/gpio/export
root@imx6s-openrex:~# echo out > /sys/class/gpio/gpio199/direction
root@imx6s-openrex:~# echo 1 > /sys/class/gpio/gpio199/value
root@imx6s-openrex:~# echo 0 > /sys/class/gpio/gpio199/value
root@imx6s-openrex:~# echo 199 > /sys/class/gpio/unexport
root@imx6s-openrex:~# modprobe ov5647_camera_mipi

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

Resolution setting

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

echo 2 > /sys/bus/i2c/devices/1-0036/ov5647_mode
gst-launch-1.0 v4l2src device="/dev/video1" num-buffers=1 ! video/x-bayer,width=1920,height=1080,framerate=30/1 ! bayer2rgb ! videoconvert ! jpegenc ! filesink location=sample_1920_1080.jpeg

Video preview

echo 2 > /sys/bus/i2c/devices/1-0036/ov5647_mode
gst-launch-1.0 v4l2src device="/dev/video1" ! video/x-bayer,width=1920,height=1080,framerate=30/1 ! queue ! bayer2rgb ! videoconvert ! fbdevsink
echo 3 > /sys/bus/i2c/devices/1-0036/ov5647_mode
gst-launch-1.0 v4l2src device="/dev/video1" ! video/x-bayer,width=640,height=480,framerate=15/1 ! bayer2rgb ! videoconvert ! fbdevsink
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