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I'm currently working on integrating libcamera-apps into a Buildroot environment for a Raspberry Pi Zero 2W. My end goal is to successfully run the uvc-gadget while utilizing libcamera for camera functionality. However, I keep running into a persistent error: "No cameras detected".

Here's the relevant things I've done so far:

  1. Started with Buildroot Defconfig:

    • I used the raspberrypizero2w_64_defconfig as my base configuration.

  2. Modified Toolchain:

    • Adjusted the toolchain settings to include the necessary headers and dependencies required by libcamera-apps.

  3. Enabled Required Packages:

    • Enabled libcamera and libcamera-apps in the Buildroot configuration.
    • Set /dev management to use the eudev option, as it seemed necessary for device detection.

  4. Version Pinned Dependencies:

    • I manually updated the .mk files for both libcamera and libcamera-apps to use specific commits that I know are compatible. These commits were tested successfully on Raspberry Pi OS Lite. Specific commit hashes are below.

  5. Modified libcamera Source Repository:

    • Configured the libcamera package in Buildroot to pull directly from the raspberrypi/libcamera GitHub repository instead of the official upstream repository.

  6. Verified Compatibility on Raspberry Pi OS:

    • Using the same versions of libcamera and libcamera-apps, I was able to successfully compile and run the applications on Raspberry Pi OS Lite. This confirms that the versions and configuration are compatible, but the issue seems isolated to Buildroot.

Observed Behavior

When running the UVC gadget in my Buildroot setup—before I changed the toolchain and tried compiling libcamera-apps—I consistently encountered the error: "No cameras detected", as well as a "no IPA modules found" warning.

After changing the toolchain, enabling libcamera-apps, and making the changes mentioned above to the .mk files, I encounter a new error when I run make:

../core/rpicam_app.cpp: In member function ‘void RPiCamApp::StartCamera()’:
../core/rpicam_app.cpp:642:78: error: ‘controls::rpi’ has not been declared
  642 |         if (!controls_.get(controls::ScalerCrop) && !controls_.get(controls::rpi::ScalerCrops))
      |                                                                              ^~~
../core/rpicam_app.cpp:673:49: error: ‘controls::rpi’ has not been declared
  673 | controls_.set(controls::rpi::ScalerCrops, libcamera::Span<const Rectangle>(crops.data(), crops.size()));
      |                                                 ^~~
[11/33] Compiling C++ object rpicam_app.so.1.7.0.p/image_jpeg.cpp.o

Questions

  • Is there any additional configuration required in Buildroot to ensure proper camera detection?
  • Has anyone successfully integrated libcamera-apps with Buildroot? I don't understand why it fails to build in Buildroot when I'm using two compatible versions. Is changing the version not enough?

Any help or guidance would be greatly appreciated! If additional logs or specifics are needed, let me know, and I'll provide them.

Thanks in advance!

Additional Context

  • libcamera Commit: d83ff0a4ae4503bc56b7ed48cd142c3dd423ad3b
  • libcamera-apps Commit: 5a3f5965aca96c2d575261e4e4045f0e0481279b
Elias
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