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usart_rx() is a nonblocking USART receive. Add it for symmetry with
usart_tx().
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nzmichaelh rightly argues that actual RX buffers should be
heap-allocated, to avoid wastage for unused devices. Deprecate the
field for 0.0.12, since that's coming out soon. This will let us get
rid of this field in master immediately after 0.0.12 gets shipped.
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Place the USART_RX_BUF_SIZE #define within an #ifndef to allow users
to pick their own buffer size.
See http://forums.leaflabs.com/topic.php?id=803
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In keeping with convention.
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Other USART transmission functions are still blocking, but are now
implemented in terms of usart_tx().
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Many of the #defines in libmaple.h were board-specific, not
MCU-specific. Most of these were only used by code under
libmaple/usb/. These were moved into usb_config.h, and are clearly
marked as being terrible hacks. I'm going to treat the USB stack as a
black box that we'll deal with later.
Further, instead of having a variety of #defines like "How many USARTS
do I have?", we decide that based on the density of the chip. This is
determined by testing for STM32_MEDIUM_DENSITY or STM32_HIGH_DENSITY
defines. libmaple currently doesn't support low-density chips, so
that suffices. The Makefile will set these automatically based on the
MCU.
Other offending #defines are ERROR_LED_PORT and ERROR_LED_PIN; these
were made optional, but they're set in the Makefile as a hack to keep
things working.
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This provides DMA, IWDG, PWR, and BKP support, and fixes several bugs.
Conflicts:
libmaple/adc.h
libmaple/libmaple.h
libmaple/ring_buffer.h
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Fixed a bug where the maximum baud rate was incorrectly set to 225000
General cleanup
Use new rcc and nvic APIs
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Relicensed the bulk of libmaple under the more permissive MIT License,
from GPLv3. Files that were largely or entirely derived from
the Arduino, STM, or Lanchon retain their original licenses.
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copy-to-ide and Makefile updated to conform; .gitignore added;
LICENSE added
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