altimeter - AVR code for an in-progress pressure altimeter

	Commit message (Collapse)	Author	Age
*	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.
*	Initialise data manager with ISA pressure	David Phillips	2021-02-13
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*	Add dep files to Makefile	David Phillips	2021-02-13
\| \| \| \|	Also includes WIP data manager code.
*	Set GPIOs for profiling/debug	David Phillips	2020-12-20
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*	Use float-enabled printf implementation	David Phillips	2020-12-20
\| \| \| \| \|	I hadn't realised there is a float-enabled printf implementation in AVR libc, so let's use that instead of our own hack.
*	Set a 2 second watchdog timer	David Phillips	2020-12-13
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*	Derive OCR1A from F_CPU	David Phillips	2020-12-13
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*	Initial prototype	David Phillips	2020-12-13
	This patch adds a skeleton of AVR code for a "simulator" target (atmega2560) and for the real intended hardware target (atmega32u4). The simulator target is one that is supported by the QEMU AVR emulator, while the 32u4 is currently not.