| Commit message (Collapse) | Author | Age |
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Removed old iterations of the project and moved the files from 02-usart
to the root directory since that's the sole place where the action is
and that subproject has outgrown its initial title.
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This gpio subsystem keeps track of the GPIO pins which
have been reserved and takes care of the housekeeping
with keeping them running.
This gpio subsystem also knows which alternate functions
belong to which pins, so it can automatically configure
the pins for the alternate functions.
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Before, when running a test binary in --nofork mode, it was up to the
test to reset the program state before exiting to avoid dependencies on
other tests. Now after each test the test harness will:
1. Wipeout the fake environmennt.
2. Reset the data segment to its initialization state.
This achieves reasonable insulation between tests even though certain
things (like a segfault) are stil not practical to completely insulate
without fork()'ing.
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Before this fix, hfree would neglect to set the prev pointer in the next
used block and such was leaving the prev pointers invalid after
coalescing frees.
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What was in core/ is now moved to arch/stm34l4xxx/peripherals. This new
directory is *supposed to* to contain raw header files defining just the
pertinent register structures for the various peripherals. Peripheral
management belongs somewhere in the new `kern/..` directories. This is
not completely the case at the moment, so more refactoring needs to be
done.
What was sitting in the root has now been moved into the kern/
directory. The kern/ directory is to contain everything else
other than raw device register definitions. The root of the kern/
tree is reserved for standard library-esque headers.
The kern/<peripheral> directory contains management systems for that
peripheral. (At the moment DMA is the only peripheral with a decent
management system.) Preferably these peripheral systems should only
include their correlating header in arch/stm34l4xxx/peripherals, and
use other management systems for handling other peripherals rather
than manipulating their raw registers directly. (Though this ideal
will require much more critical mass of management systems.)
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The new halloc() call allocates memory on the
STM32l's SRAM2 starting right above the DATA
section.
The implementation uses a very-dense, albeit slower, linked-list
allocation as opposed to fancy B-trees or something. However, the
overhead is just 1 32-bit word per allocation and thus allows for
reasonably dense memory-packing on the small 16K memory chip.
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This abstraction makes it much more intuitive to use the
DMA features on the STM32L4 boards.
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Apparently people really don't like bitfields in practice,
so I have devised a compromise to retain some readability while
using bitmasks instead by writing a regset() macro.
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subdirectory.
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testing_harness with fake environment to allow testing on x86
development machines.
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