This is the eighth post in a weekly series tracking the development of Tock, a safe multi-tasking operating system for microcontrollers.

Imix

We’ve sent out for production what we think is going the final version of imix. It includes fixes to a variety of small electrical issues we found after porting more of Tock to it. The final revision Will cost around $90 to produce at medium-scale (100s) and we plan on making these available at cost (plus whatever overhead) sometime in the next couple months.

Drivers, Capsules and Interfaces

• @bradjc merged several of their drivers from signpost upstream, including:

  • SI7021 temperature and humidity sensor

  • FM25CL FRAM storage

• @bradjc’s changes to the ADC are merged

• We added an LED and Button driver similar to the GPIO driver to allow cross platform applications to use whichever buttons and LEDs are available.

• @KBaichoo fixed a gnarly bug in the SAM4L SPI controller capsule.

Interprocess communication (IPC)

@alevy opened a pull request to begin merging work on an interprocess communication model based on the existing system call interface.