In our last article, we built a kernel for the Jetson TX1. In this article, we go over an example of how to build a simple module for the ubiquitous Sony PlayStation Eye for the Jetson TX1. Looky here:
Preface
Note: If all you are looking for is a prebuilt PlayStation Eye Camera driver module for the standard Jetson TX1 dev kit, check out a version on Github available here. The Github version is for the L4T 24.2 release, kernel 3.10.96-tegra.
To load the module:
$ git clone https://github.com/jetsonhacks/installPlayStationEyeTX1.git
$ cd installPlayStationEyeTX1
$ ./setupPS3Eye.sh
If you want to learn how to build modules, continue on.
Background
Way back in January 2015, we covered how to build a PlayStation Eye driver module for the Jetson TK1. The PS3 Eye’s inexpensive price, relatively good performance, and the ability to mod the device to detect infrared makes the camera a favorite among DIYers. The procedure for building the driver module for the camera is the very much the same as for the Jetson TX1.
The instructions assumed that the kernel source has been installed as described in the previous article.
$ cd /usr/src/kernel
$ sudo make xconfig
This will bring up the kernel configuration editor.
Here’s the path to enable building the camera device driver module:
Device Drivers -> Multimedia Support -> Media USB Adapters -> GSPCA based Webcams. Scroll down to OV534 OV772x USB Camera Drive
Make sure to save the kernel configuration. Next, prepare the modules, and then build them:
$ sudo make modules_prepare
$ sudo make modules SUBDIRS=drivers/media/usb/gspca
Once the module is built, it’s time to copy it over to the appropriate /lib/modules directory:
$ sudo cp /usr/src/kernel/drivers/media/video/gspca/gspca_ov534.ko /lib/modules/$(uname -r)/kernel/drivers/media/usb/gspca/
You can then insert the module:
$ sudo depmod -a
$ cd /lib/modules/$(uname -r)/kernel/drivers/media/usb/gspca/
$ sudo insmod gspca_ov534.ko
At this point, you should be good to go!
Note: If the insert module gives you an error, it main be because gspca_main is not inserted. gspca_main should be listed when you run:
$ lsmod
If gspca_main is not listed:
$ sudo insmod gspca_main.ko
$ sudo insmod gspca_ov534.ko
Running lsmod again should show both gspca_main and gspca_ov534 loaded.
Some shortcuts
Instead of copying the driver, you can run:
$ sudo make modules_install
Note that this will install all of the modules, and might cause issues.
Also, rebooting the system once the driver has been copied to the correct location should result in the driver being loaded, and mean that you don’t have to run the insmod command.
Conclusion
Hopefully by this point, you have an idea of how to build the kernel and auxiliary modules on the Jetson TX1. This is not an all inclusive description, but just a sample to get started.
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