1. Move buffer configuration from boards to cpu/stm32
2. Allow overwriting buffer configuration
- If the default configuration ever needs touching, this will be due to a
use case and should be done by the application rather than the board
3. Reduce default RX buffer size
- Now that handling of frames split up into multiple DMA descriptors works,
we can make use of this
Note: With the significantly smaller RX buffers the driver will now perform
much worse when receiving data at maximum throughput. But as long as frames
are small (which is to be expected for IoT or boarder gateway scenarios) the
performance should not be affected.
There is no hardware limitation for custom boards based on STM32 to uses
SPI bus with signals coming from different PORT and alternate functions.
This patch allow alternate's function definition per pin basis, thus enable
the support of SPI bus signals routed on differents PORT.
Signed-off-by: Yannick Gicquel <ygicquel@gmail.com>
cpu/$(CPU)/Makefile.features and cpu/$(CPU)/Makefile.dep are
automatically included
Part of moving CPU/CPU_MODEL definition to Makefile.features to have it
available before Makefile.include.
The periph_dma is not pulled in automatically for all applications.
Applications willing to use the configured peripherals with periph_dma
for a given board will have to include the feature explictly in their
Makefile.
It was causing unrelated issues as threads got de-scheduled while
calling printf and this was not handled properly in tests at that
moment.
The file always exist so no need to do '-include'.
Replaced using:
sed -i 's|-\(include $(RIOTCPU)/.*/Makefile.features\)|\1|' \
$(git grep -l '$(RIOTCPU)/.*/Makefile.features' boards)
