Programming a GPS watch (opens in new tab)

(renaud.schleck.free.fr)

44 pointskersny11y ago4 comments

4 comments

Interesting. What OS is this running? Linux?

It's an embedded platform, running on this http://www.futurlec.com/STMicro/STM32F103RET6.shtml with at most 512kb flash memory The board contains an additional 1MB memory.

It does very "simple" things and does not need an OS per se: if you look at the source code, it's basically a loop getting GPS pos and dumping them.

For comparison, here is a (incomplete/outdated) list that shows smallest footprint for a Linux system is here this: http://elinux.org/Best_of_Embedded_Linux#Candidates

In other words: way too small to run any sort of modern day OS....(and it would be too power-hungry anyway :-) )

You can use a small real-time operating system, like FreeRTOS [0] even [1] for the small MCUs like STM32F103 (which is ARM Cortex-M3).

not on a STM32F103. probably just bit banging everything himself.

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