Add pin mapping code.

This commit also introduces board directories and moves board
specific config into the appropriate board directory.

boards/stm32f4xx-af.csv was extracted from the STM32F4xx datasheet
and hand-tweaked.

make-pins.py takes boards/stm32f4xx-af.csv, boards/stm32f4xx-prefix.c,
and boards/BOARD-NAME/pins.csv as input and generates the file
build/pins_BOARD_NAME.c

The generated pin file for PYBOARD4 looks like this:
https://gist.github.com/dhylands/9063231

The generated pins file includes all of the supported alternate
functions, and includes upsupported alternate functions as comments.

See the commnet block at the top of stm/pin_map.c for details on
how to use the pin mapper.

I also went ahead and modified stm/gpio.c to use the pin mapper.

1 files changed, 2 insertions, 0 deletions

diff --git a/stm/main.c b/stm/main.c
index b283821bba..f82a18692e 100644
--- a/stm/main.c
+++ b/stm/main.c
@@ -50,6 +50,7 @@
 #include "adc.h"
 #include "rtc.h"
 #include "file.h"
+#include "pin.h"
 
 int errno;
 
@@ -445,6 +446,7 @@ soft_reset:
         rt_store_attr(m, MP_QSTR_ADC, (mp_obj_t)&pyb_ADC_obj);
         rt_store_attr(m, qstr_from_str("millis"), rt_make_function_n(0, pyb_millis));
 
+        pin_map_init(m);
         gpio_init(m);
 
         rt_store_name(MP_QSTR_pyb, m);