TK1-SOM AR0330 Camera Setup Guide

Hardware Information

The TK1-SOM supports dual CSI-2 ports
AR0330 sensor: 3MP, 1/3" CMOS
Camera connects through CSI interface and I2C for control

System Requirements

TK1-SOM running L4T (Linux for Tegra) R21.3
Kernel Version: 3.10.40
AR0330 driver built into kernel (CONFIG_VIDEO_AR0330=y)

AR0330 Camera Module Conflict Resolution

The AR0330 camera on TK1-SOM has a known issue with module conflicts. The nvhost_vi and tegra_camera modules both try to register the VI driver, causing initialization failures.

Manual Fix

To manually fix the issue:

Check if the nvhost_vi module is loaded:
```
lsmod | grep -i vi
```

Unload nvhost_vi and load tegra_camera:

sudo rmmod nvhost_vi
sudo modprobe tegra_camera

Verify that the camera modules are now loaded correctly:

lsmod | grep -E "video|tegra|camera"

Expected output:

tegra_camera           20484  0
soc_camera_platform     2106  1
videobuf2_dma_contig     8796  1 tegra_camera

Check if the video device node has been created:
```
ls -l /dev/video*
```

Automatic Fix (Recommended)

For a permanent solution that works across reboots, create an init script:

Create the init script:

sudo tee /etc/init.d/camera-module-fix << EOF
#!/bin/sh
### BEGIN INIT INFO
# Provides:          camera-module-fix
# Required-Start:    \$local_fs \$remote_fs
# Required-Stop:     \$local_fs \$remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Fix camera module loading
### END INIT INFO

case "\$1" in
  start)
    echo "Unloading nvhost_vi module..."
    rmmod nvhost_vi || true
    echo "Loading tegra_camera module..."
    modprobe tegra_camera || true
    ;;
  stop)
    ;;
  *)
    echo "Usage: /etc/init.d/camera-module-fix {start|stop}"
    exit 1
    ;;
esac

exit 0
EOF

Make the script executable and enable it to run at boot time:

sudo chmod +x /etc/init.d/camera-module-fix
sudo update-rc.d camera-module-fix defaults

Run the script manually to apply changes immediately:
```
sudo /etc/init.d/camera-module-fix start
```

Testing the Camera

Verify the camera is working by checking its properties:
```
v4l2-ctl --all --device /dev/video0
```

Test camera stream with GStreamer:

gst-launch-1.0 nvcamerasrc ! 'video/x-raw(memory:NVMM),width=1280,height=720,format=NV12,framerate=30/1' ! nvvidconv ! nvoverlaysink

Troubleshooting

If the camera is still not detected:

Check physical connections to CSI port

Verify I2C detection (AR0330 should be on bus 2 at address 0x10 or 0x18):

for i in {0..5}; do echo "=== i2c-$i ==="; sudo i2cdetect -y $i; done

Check kernel logs for errors:

dmesg | grep -i "camera\|ar0330\|tegra\|vi"

Additional Resources

TK1-SOM Reference Guide
AR0330 Datasheet
L4T Documentation

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