mruby/c: Running on Less Than 64KB RAM Microcontroller
summary
A one‑chip IoT sensor suite for a Japanese Sake brewery actually ships and runs Ruby bytecode on microcontrollers: mruby/c compiles mRuby bytecode into a tiny VM that fits less than 64KB RAM devices (example: PSoC5LP with 65KB RAM) and runs bare‑metal without RTOS; the deployed device (delivered Jan 2018) reads thermistors, CO2 and posts to a server, drives LEDs, and the demo uses ESP32 too. Development uses C glue, mrubyc bytecode toolchain and mrubyc test and debugger to unit test and inspect tasks.
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chapters (19)
- 0:00Start
- 1:53Terminology
- 3:13Why microcontroller?
- 5:10Which microcontroller?
- 9:19Demo
- 11:01Bugaboos in IoT
- 11:36Peripheral equipments
- 12:17CRuby and serial port
- 13:14Soldering
- 14:08What is mruby?
- 16:08HEX dump of bytecode
- 16:38mruby/c on microcontroller
- 18:15How less? - For example
- 19:29How does mruby/c work
- 21:37Application code
- 28:03Dev tools for mruby/c
- 29:03mrubyc-utils
- 29:48mrubyc-test
- 33:02Conclusion
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