Cleaned out libmaple.h; this had wide-ranging implications.

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.

1 files changed, 2 insertions, 0 deletions

diff --git a/libmaple/usart.h b/libmaple/usart.h
index 0ca3f55..90b3415 100644
--- a/libmaple/usart.h
+++ b/libmaple/usart.h
@@ -43,8 +43,10 @@ enum {
     USART1,
     USART2,
     USART3,
+#ifdef STM32_HIGH_DENSITY
     UART4,
     UART5,
+#endif
 };
 
 /* peripheral register struct  */