puddle-core

Puddle Core

Cross compiling

We use nix for dependency management, including cross compilation. cross spins up a docker container with the necessary (cross-compiled!) dependencies and build it in there, dropping the result in the target folder on the host machine just like regular compiling. Here's how to install it and get cross-compiling:

First install Docker however you want, and then install cross:

cargo install cross

Now you should be able to go ahead and build! Note that you use cross instead of cargo when cross compiling, and you still need to put the target flag:

cross build --target armv7-unknown-linux-gnueabihf

Using the camera

Make sure to enable then camera using sudo raspi-config under "Interfacing Options".

Then make sure the bcm2835-v4l2 video drivers are loaded. You can either do this at the command line with sudo modprobe bcm2835-v4l2, but you'll have to do it after every boot. Instead, you can add the line bcm2835-v4l2 to /etc/modules/. You'll need to reboot once after you do this.