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Mirroring and controlling a smartphone via a vehicle’s screen enable hands-free access while ensuring comfort and safety. Existing solutions like Android Auto or CarPlay require high-end MPUs and rich OSes. In this talk, we demonstrate a lightweight and low-cost alternative using the i.MX RT1170 MCU running Zephyr RTOS:
https://www.youtube.com/watch?v=EVt0pZxM8Xg
The Android phone captures its screen, compresses it in MJPEG, and streams it to the MCU. On the Zephyr side, we use ffmpeg for video decoding and send touch events to the phone. Despite no hardware decoder, we achieved 11 fps with 100–200 ms latency. MJPEG was chosen over H.264 for its better performance. Upcoming MCUs like the i.MX RT2660/RT2770 with MJPEG/H.264 hardware decoders will boost this further.
We are currently transitioning to Wi-Fi for a fully wireless set-up and offloading camera-based gesture control to the smartphone for hands-free controls. Finally, to inject touch events into Android without root access, the Android application needs to be launched in a shell by ADB from a laptop. We're working on porting ADB to Zephyr to automate this process for a seamless, plug-and-play user experience.
Senior Embedded System Engineer, TechLead at NXP, NXP Semiconductors
I am currently an embedded system engineer and Multimedia IoT TechLead at NXP since 3 years. I am also an active collaborator of the Zephyr video subsystem. I am particularly passionate about image and video and was working on various related topics including computer vision, HCI... Read More →
Embedded Software Engineer, NXP Semiconductors France
Phd in the domain of image and video compression, I am currently working at NXP, contributing to the development of drivers for display and camera on the company's embedded MCU.
