Bring back HardwareSerial.

To make this happen, we need to have <board/board.h> tell us whether
or not it's got each of the USARTs. Do that with BOARD_HAVE_USARTn,
for n = 1,...,6. This lets us define HardwareSerial instances only
when appropriate, and gets rid of some board-specific hacks we'd
accumulated.

The new <libmaple/usart.h> now has a convenience function for
determining the bus rate by using the appropriate STM32_PCLKx macro,
so we can shave a uint32 per instance, which is nice given that
they're all going to be in memory. This changes the constructor
arguments, but the API only specifies the semantics of the predefined
instances, so this is still backwards-compatible. (We should look into
storing the instances in Flash -- they don't change, after all.)

We don't actually need struct usart_dev's definition in
HardwareSerial.h, so replace it with a forward declaration and include
<libmaple/usart.h> it in HardwareSerial.cpp instead.

Assert some copyrights.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/wirish/boards/maple_mini/include/board/board.h b/wirish/boards/maple_mini/include/board/board.h
index bfba46d..8ba91ce 100644
--- a/wirish/boards/maple_mini/include/board/board.h
+++ b/wirish/boards/maple_mini/include/board/board.h
@@ -43,6 +43,12 @@
 #define BOARD_LED_PIN             33
 
 #define BOARD_NR_USARTS           3
+#define BOARD_HAVE_USART1         1
+#define BOARD_HAVE_USART2         1
+#define BOARD_HAVE_USART3         1
+#define BOARD_HAVE_UART4          0
+#define BOARD_HAVE_UART5          0
+#define BOARD_HAVE_USART6         0
 #define BOARD_USART1_TX_PIN       26
 #define BOARD_USART1_RX_PIN       25
 #define BOARD_USART2_TX_PIN       9