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E39-Rpi HMI

The Jetpack Compose HMI is a desktop Linux app I wrote that runs on my development laptop as well as the RPi Raspbian image.

It interfaces with the hardware by:

• BlueZ-DBus to have a bluetooth pairing wizard implemented in the HMI
• PipeWire to forward BT audio to the speakers. (Laptop Speakers on the dev machine, Audio out on the RPi to BMW Radio Aux in)
• Serial port for incoming IBUS messages.

The HMI uses the Compose MPP WindowManager hints to maximize itself without a titlebar on the RPI. On the dev laptop, it is convenient to work with alongside IntelliJ.

The HMI Window has screens managed by the navigator. When I started in 2021, there weren’t that many off-the-shelf screen navigation libraries to choose from, so I wrote my own.

I made my own widget design system that allows all the Compose UI to be controlled by the rotary knob on the BMW display.

Screenshots

Sitemap (Hardware)

• Hardware
  • Hardware
  • Test Boards
    • Test Boards
    • VGA to RGsB Adapter Board
    • Pico VGA
    • Car Adapter Breakout
    • Meanwell Power Supply
    • Audio Breakout Board
    • None
  • Video Output
    • Composite Out through TV Module
  • Test Bench
    • Construction Photos
  • Sled
    • Construction Photos
    • Testing Photos
  • Mainboard
    • Mainboard
    • Powerboard

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