altimeter - AVR code for an in-progress pressure altimeter

	Commit message (Collapse)	Author	Age
*	Migrate display to new peripheral model	David Phillips	2021-02-27
\|
*	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.
*	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.
*	Set GPIOs for profiling/debug	David Phillips	2020-12-20
\|
*	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
\|
*	Derive OCR1A from F_CPU	David Phillips	2020-12-13
\|
*	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.