rpi5-blink

rpi5-blink

Requirements

• A Raspberry Pi 5 board
• An SD Card, with a Raspberry Pi OS installed (this way, we don't need to create the configuration files from scratch). You may backup kernel8.img and kernel_2712.img if you need the Linux install later, since we will change these files.
• LLVM installed (brew install llvm) and added to PATH. This is needed to convert the resulted ELF file to binary image format using llvm-objcopy.

How to build and run this example:

• Make sure you have a recent nightly Swift toolchain that has Embedded Swift support.
• Build the program, then copy the kernel image to the SD card.

$ cd rpi5-blink
$ export TOOLCHAINS='<toolchain-identifier>' # Your Swift nightly toolchain identifier
$ make
$ cp kernel8.img /Volumes/bootfs  # Copy kernel image to SD card
$ rm /Volumes/bootfs/kernel_2712.img # Delete this kernel image so our kernel8.img is used
$ # You can also rename our kernel8.img to kernel_2712.img, or set it to anything you want and specify "kernel=[your-img-name]" in config.txt.

• Place the SD card in your Raspberry Pi 5, and connect it to power.
• After the boot sequence, the green (ACT) led will start blinking in a regular pattern.