altimeter - AVR code for an in-progress pressure altimeter

	Commit message (Collapse)	Author	Age
*	Use more generic interface for barometer and timer	David Phillips	2021-02-27
\| \| \| \| \| \| \| \| \| \| \|	This patch abstracts the global symbols for getting barometer readings behind a "struct of function pointers" interface as popular in Linux Kernel, U-Boot and others. This means that unit testing can take place with mocked hardware peripherals. The old "global" drivers are still available, behind explicit function calls required to access the now-static functions. This patch also introduces a timer peripheral software module with the same model, to support future unit testing of altitude rate etc.
*	Refactor data_manager to use contexts	David Phillips	2021-02-14
\| \| \| \| \| \|	This should be more testable and flexible. Note that the barometer has internal non-resettable state which enforces a certain test order. This should be fixed soon.
*	Tick data manager on init	David Phillips	2021-02-13
\|
*	Initialise data manager with ISA pressure	David Phillips	2021-02-13
\|
*	Add dep files to Makefile	David Phillips	2021-02-13
	Also includes WIP data manager code.