Unreasonably Efficient AR: Using Zephyr to Achieve More with Simple Hardware
summary
Zephyr runs on an NXP iMX RT500 crossover MCU to drive a tiny wearable with a high‑density OLED microdisplay and low‑res camera, proving a microcontroller can replace an MPU for some AR tasks. Uses: Zephyr/West build flow, J‑Link SWD, FlexSPI flash tweaks, MIPI DSI two‑lane tuning, and a disassembled SmartDMA/E firmware blob; surprising result: a 16‑bit full frame fits SRAM and yields 1080×1080 at ~60 Hz after clock and packet hacks. Built prototype works for display, camera and Wi‑Fi streaming; SmartDMA/E reverse‑engineered to ingest camera data.
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chapters (14)
- 0:00AR project and Zephyr choice
- 3:15Zephyr vs embedded Linux
- 4:37IMX RT500 board hardware
- 6:46Bringing up new board
- 9:57OLED microdisplay challenges
- 13:10Frame buffer optimization
- 17:09Display register debugging
- 21:06Camera bring-up with Smart DMA
- 24:44Smart DMA firmware reverse
- 26:30Sensor fusion and input
- 27:12Wi-Fi and video streaming
- 28:14DSP and GPU for AR
- 29:59Zephyr experiences summary
- 33:00Q&A
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